best sailboat bilge pump

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The Best Bilge Pumps For Reliable Drainage

Do you own a boat? If not, what about a car? Boat owners and car owners alike have one major thing in common, and that’s the tendency to treat their motorized equipment with a lot of TLC. It all comes down to taking care of their boat and viewing boat ownership as a major responsibility. No matter which type of boat you own, there's absolutely no way for you to fully prevent any and all water from seeping into it.

Truthfully, no matter how intentional you are about sidestepping it, water will get into your boat in one way or another. But you don’t have to keep it there! Instead, invest in one of the best bilge pumps of 2024. Intentionally designed to remove water from the bilge of your boat, a bilge pump — like our favorite one, the MAXZONE Bilge Pump — can help you like no other. Read our buying guide to find out more!

Our Top Picks For Bilge Pumps

• Best Overall: MAXZONE Bilge Pump Shop Now ➔
• Most Affordable: MAXZONE Automatic Bilge Pump Shop Now ➔
• Easy To Install: Shoreline Marine Bilge Pump Shop Now ➔
• Best Warranty: Dontmiss Automatic Bilge Pump Shop Now ➔
• Best Performance: Creatorele Bilge Pump Shop Now ➔
• 1 Features To Look For in a Bilge Pump
• 3 Automatic
• 5 Installation

Which type of bilge pump is best for large boats?

Why do small boats need high-capacity pumps, is one pump enough for my boat, which type of switches are best, do i really need a bilge pump, related articles, the best bilge pumps, best overall.

MAXZONE Bilge Pump

While MAXZONE’s Bilge Pump is inexpensive in comparison to its competitors, this in no way means that the brand compromises on its features. Featuring a flow rate of 1100 GPH at 12V, it’s suitable for all kinds of water vessels, including fishing boats, cruises, and yachts. 

Compatible with hydraulic systems that utilize cold water, it has a moisture-tight seal that enables the motor to work very efficiently. Other admirable features include ignition protection and ABS-exclusive construction.  The pump has a lockable strainer base that acts like an automatic bilge pump. Additionally, it has a head of up to 13 feet, resulting in distant water expulsion and making it our favorite option on the list.

• Great for those on a budget 
• Can withstand various environments
• Vibrant colors for visibility 
• Might produce loud sounds

Most Affordable

MAXZONE Automatic Bilge Pump

The MAXZONE Automatic Bilge Pump is an all-in-one pump. Fully automatic and capable of operating as a controlled reed sensor system with a maximum flow rate of 11000 GPH at 12V, it has a built-in float switch. This means that this pump uses energy only after its activation and stops usage after it has shut down. 

Featuring a nylon hose barb that allows multiple connection options, the device has a prolonged life motor with an anti-fouling impeller and ABS-exclusive moisture seal. The strainer base is also detachable, which makes cleaning and maintenance easy.  It also works very well for small and larger boats!

• Made with durable materials 
• Takes up very little space
• Excellent option as a backup pump
• Doesn’t have a sensitive float switch

Easy To Install

Shoreline Marine Bilge Pump

Shoreline’s Marine Bilge Pump is without a doubt one of the best in the industry. Capable of being submerged and operating on a pumping capacity of 600 GPH, it is small, compact, and exemplary if you’re looking for something modest. 

Featuring a very low current of 3A, all of its hardware uses stainless steel with marine-grade lead wiring. Even though the pump itself is pretty inexpensive, if you’re looking for it to be automatic you’ll have to add a few additional parts to the total cost, such as a float and switch. It also comes with a mounting bracket and a user-friendly guide.

• Removable easy-to-clean design
• Secure clip for ease of installation
• Universal silent-operation mounting system
• May have a weak pressure

Best Warranty

Dontmiss Automatic Bilge Pump

The Dontmiss Automatic Bilge Pump is extremely powerful. It supports both automatic and non-automatic connections. Plus, the installment features different colored wires for your desired operation mode. With the built-in electronic sensor system being responsible for promoting a more complete automatic function, Dontmiss ensures zero energy consumption. 

With a capacity of 750 GPH and a flow rate of 12.5 gallons per minute at 12V, an integral float switch eliminates the need for an additional one. Adding to its functionality, it is inaudible and vibrationless, and the added quick-release strainer makes its maintenance a little easier.  Even though it’s not a well-known brand, you can rest assured that Dontmiss will last for years to come.

• Sealed motor that doesn’t burn out
• Comes with a one-year warranty
• Resistant to rust and corrosion
• Might have float switch malfunctions

Best Performance

Creatorele Bilge Pump

The Creatorele Bilge Pump is fully submersible and extremely easy to use. Ideal for small boats and fishing boats, it has a rated voltage of 12V and a capacity of 1100 GPH. As one of the reasons for the commendable efficiency of this pump, the stainless steel shafts and ABS plastic pumps of this bilge pump are resistant to different impacts. 

The discharge port has a nylon pump that accommodates all kinds of joints. Also, when it comes to cleaning, Creatorele offers an instruction manual to make the job easier, resulting in maximum productivity and extended usage.

• Very affordable price point
• Extremely versatile design
• Reliable and high-performing
• Might deter corrosion 

Buyer’s Guide: Best Bilge Pumps

Commonly referred to as nuisance water, not having a quality bilge pump can destabilize your boat and damage your machinery. More importantly, it may sink your boat within minutes.

Features To Look For in a Bilge Pump

A bilge pump is a handy, essential tool that quickly pumps out gallons of water. Taking into account different boat sizes and environments of the boats, here are a few things to look for when purchasing a bilge pump.

The size of the bilge pump is dependent on the gallons of water it is capable of throwing out. You’ll most likely use these pumps in tricky situations, so it’s better to choose a larger pump with a high flow rate as it will be effective in case of emergencies. There is no standard size of a bilge pump, but one with a discharge capacity of 1,000 gallons per hour or more should be good enough for both small and large boats.

With a built-in float switch, it works through an integrated sensor system. Fast and thorough, a bilge pump saves the user from the trouble of finding a separate switch. All in all, it’s also the best and most effective option.

The model of your bilge pump will depend on your needs as both models have their advantages and disadvantages. For example, while manual pumps are more suitable for small boats they are easy to manage and do not require any technical skills to operate them.

Nevertheless, as a downside they may not be quick enough in certain situations—so it is preferable to have an electric bilge pump with a backup manual pump in bigger boats. An automatic electric pump is quicker and proved to be more effective.

The float switch, upon activation, removes all unwanted water before it can cross normal levels. Dying your boat in a few minutes, having a manual pump as a backup is great to have as a precaution in case of short circuits or a low battery.

Installation

The bilge is the narrowest space in a boat, which is why it is not easy to install a bilge pump or any other gear in it. Therefore, it is also necessary to make sure the pump fits into the bilge safely.

Even though the expulsion volume should be a primary factor in choosing the size of a bilge pump, it may be useless if it cannot be easily installed and worked to its full potential. The strainers of the pump should be easily accessible for cleaning as well. This is why experts recommend getting pumps with removable strainers.

A diaphragm pump uses a rubber or plastic diaphragm for water intake and output. Efficient yet susceptible to clogging, the centrifugal pump works through a spinning impelling. It sucks water and discharges it with pressure, making it an extremely reliable and fuss-free option.

People Also Asked

Centrifugal pumps are the best option for bigger boats because the larger the vessel, the higher the capacity.

Small boats still need high-capacity pumps because they will sink quickly if water enters the ship. This is due to the small hull volume and bilge, so they need a high-capacity pump for the fastest water discharge possible.

While having one pump on hand works for small boats, you'll need to mount more pumps the larger the size of the boat. This will ensure that you can rely on efficient water removal. To ensure that your bilge pump is compatible with your boat, consider taking a quick look at the product description prior to buying one.

Automatic built-in switches with controlled sensors are best. They’re a great option for both professionals and beginners alike because they are so easy to use.

Yes! If you don't have a bilge pump, your boat will be more susceptible to sinking while at sea, and this can be a dangerous — if not fatal — scenario. 

Article Contributors

Sail magazine review team.

SAIL Magazine Review Team reports on best-selling products in sailing and boating. SAIL Magazine is reader-supported: When you buy through links on our site, we may earn an affiliate commission. Artificial Intelligence (large language models) may have been used in the research and creation of the content.

To ensure questions about product testing or a specific article are addressed, please contact [email protected]

Yachting World

• Digital Edition

Best manual bilge pump – 9 top choices

• January 4, 2024

We like to keep the water on the outside of our boats, but inevitably water gets into the bilge. Either from rain leaks, wave inundation or a host of other reasons. Every boat should be equipped with a manual bilge pump. Here's my pick of the best currently available.

Every boat I’ve ever sailed on or cruised in has one or more of these pumps onboard. I’ve had hands on experience of all but one of these pumps. Choose a pump with the capacity to suit your boat but also choose one that can be used easily. You might have an internal pump where it fits in a cupboard for transferring fluids from one tank to another or you might need empty your bilges rapidly after being inundated with a wave. If you find yourself holed and taking on water, and if your electrical system has gone down, assuming you have one in the first place, you’ll be glad of a wise choice of manual bilge pump. Those with removable handles usually come with a lanyard to ensure it doesn’t go walkabout when you need it most.

The pumps are measured in Gallons per minute. The higher the capacity pumps require a fair bit of physical effort, so it’s a good idea to have two pumps onboard, one for every day use that’s light and easy, plus something for when the chips are down and you have a lot of water to shift. It’s amazing how much adrenaline can help when pumping water out to save your boat.

At a glance Editors choices: Best manual Bilge Pump

Patay Ocean Master Manual Bilge Pump (Lifeboat Approved) Best manual bilge pump for high volume capacity 

Whale Henderson Pump Mk 5 Best manual bilge pump ease of serviceability

SeaSense Hand Bilge Pump  Best manual bilge pump for portability

Whale Gusher 10 Bilge Pump

Specifications:   up to 17 gallons per minute (GPM) Corrosion-resistant construction, ergonomic handle, efficient diaphragm design, Hose Size 38mm / 1-1/2″ Reasons to Buy: High capacity, durable, and offers different mounting options. Reasons to Avoid: Larger in size compared to other pumps.

This Gusher pump is one of the higher capacity commonly available manual pumps currently on the market. It has a really solid metal body and the handle with the ball end is one of the longer ones available. This gives good leverage, but it does mean it can be difficult to operate in a tight space. Spares are easy to find and it is relatively easy to service, though you will need tools to access the diaphragm for servicing.

With each product is a ‘Buy it now’ link. If you click on this then we may receive a small amount of money from the retailer when you purchase the item. This doesn’t affect the amount you pay.

Whale Henderson Pump Mk 5

Best manual bilge pump ease of serviceability

Specifications: 42 LPM (11 US GPM) at 45 strokes per minute, 66 LPM (17.5 US GPM) at 70 strokes per minute, bulkhead-mounted or deck-mounted, use with freshwater, saltwater, or waste: Hose Size 38mm / 1-1/2″ Reasons to Buy: robust and durable construction, straightforward to install and maintain, self-priming Reasons to Avoid: might not be ideal for larger vessels or heavy-duty applications, requires periodic maintenance

The Whale Henderson Pump Mk 5 is a popular manual diaphragm pump designed for various marine applications, including transferring water, pumping out bilges, and handling waste. I have this exact model on my Rustler 31. It’s mounted in an impossible to access locker but it is really easy to maintain with service kits readily available at most chandleries. It has a decent flow rate, which is obviously affected by how fit you are. I recommend fitting it where you can move easily to get good access to the handle and for servicing access. Any leaves or other debris being sucked into it will need to be cleared out using the top cap which can be unscrewed. If only you can access it. Can you tell I’m a bit bitter about how mine was installed by the previous owner? It’s great value for money too.

Whale Gusher Urchin ND9010 Manual Fluid & Diesel Transfer Pump

Specifications: 36 litres per minute/ 9.5 GPM, hose size 25mm / 1″ Reasons to Buy: Simple design, reliable, and suitable for small to medium-sized boats. Reasons to Avoid: fixed handle cannot be removed

A smaller capacity but reliable manual pump. This one has a fixed handle so it needs to be mounted in such a way to allow the handle to have access at all times. This one is handy for header tanks or gravity feed tanks, day tanks etc and for  moving fluids around on a regular basis. It can be used as a bilge pump, and the diaphragm can be rotated to orientate the handle to the best position.

Seaflo Bilge Pump

Specifications: capable of pumping approx. 12 GPM, Available in various sizes (up to 36 inches) Self-priming, easy-to-use, durable plastic construction, and comes with a removable foot for easy cleaning. Hose Connections:34.5 mm (1.36″) Reasons to Buy: Simple design, reliable, and suitable for small to medium-sized boats. Reasons to Avoid: mounting options are more limited than other models of pump

Similar to the Whale Urchin this Seaflo pump has a little higher capacity at 12 Gallons per minute but is also a small unit and takes up little space. The handle can be slotted on and off for use or left in place if using as a fluid transfer pump  indoors. two handle positions so you can find a position or access that works best.

Patay Ocean Master Manual Bilge Pump (Lifeboat Approved)

Best manual bilge pump for high volume capacity

Specifications: Robust construction, 135 LPM (29.6 GPM / 35.6 US GPM), suitable for heavy-duty use. Hose Size 38mm / 1-1/2″ Reasons to Buy: Durable, efficient, and offers very high pumping capacity Reasons to Avoid: more expensive compared to other options.

This beast is the most powerful pump I can find for the UK market and understandably this one comes Lifeboat approved. You’ll need deep pockets for this but what price to pay for getting your boat out of deep doo-doo. It can pump 135 litres per minute, or 35.6 of your US Gallons PER MINUTE. I could empty my water tank in less than 60 seconds which is pretty dammed impressive.

The Patay Ocean Master pump is made from a polyester coated aluminium body with a stainless steel pump handle. It is robust and suitable for heavy duty use in the marine environment, making it suitable for workboats and larger leisure craft.

The double diaphragm pump is easily serviceable as access to the pumping chamber.  I personally love a bit of kit that is designed for use without tools. To quickly unclog this, just unscrew the unit by hand using the hand wheels.

Edson Aluminum Compact Manual Lever-Action 18 GPM Pump

Specifications: Robust construction, 18 gallons per minute, suitable for heavy-duty use. Hose size 1.5″ Inlet & Discharge Reasons to Buy: Durable, efficient, and offers high pumping rates. Reasons to Avoid: more expensive compared to other options.

The second highest capacity pump in our lineup, but also the second most expensive. You get what you pay for! For our US readers, this Edson Pump is made from Aluminum or also available in bronze, these Edson pumps are the most powerful manual pumps available. Edson also make 30 GPM models of the pump, which puts it on a par with the above Patay pump and they all come with super long handles of at least 18″, with the larger capacity pump handles measuring in at 32″! They are easy to maintain with spare/replacement diaphragms available on the Edson site. Those with traditional wooden craft can rejoice with this type of manual pump. With handles this long you can mount the pump low down and simply stand to pump.

Attwood Manual Bilge Pump

Specifications: Up to 8 GPM, Compact, ergonomic T-handle for easy pumping, corrosion-resistant, and suitable for small to medium boats. Reasons to Buy: Lightweight, affordable, and easy to store. Reasons to Avoid: Not as high capacity as some other models. doesn’t come with hose

The Attwood manual pump has a really easy to use handle, the easiest of the three  of this type I have listed. The only downside is that it doesn’t come as standard with the extra hose if you want to pump to a bucket. It’s got a good barrel grip though and feels sturdy to use. As per all of the pumps in this group, they come in different lengths. They are an absolute necessity for emptying your dinghy or rib bilge area after a massive downpour of rain.

SeaSense Hand Bilge Pump

Best manual bilge pump for portability

Specifications: Handles up to 8 GPM, Corrosion-resistant, lightweight, and compact design. Comes with a 72-inch hose. Reasons to Buy: Affordable, easy to use, and suitable for small to medium-sized boats. Reasons to Avoid: May require frequent maintenance.

The great thing about the SeaSense manual bilge pump is the long flexible hose that comes as standard and the hose clip on the barrel to help keep the hose form flailing about like an octopus arm when it’s not in use. The shaped T-handle gives a decent grip, though not quite as good as the D shaped grip of the Attwood. For kayaking, canoeing, inflatable tenders, ribs and tight locker spaces in cabin boats, these pumps are brilliant.

Beckson Thirsty-Mate 318

Specifications: Available in various sizes (up to 36 inches) Self-priming, easy-to-use, durable plastic construction, and comes with a removable foot for easy cleaning. Reasons to Buy: Simple design, reliable, and suitable for small to medium-sized boats. Reasons to Avoid: May require some effort for continuous pumping.

This handy manual pump is really easy to use, just poke into the area and point the hose into a bucket or over the side if your boat is small enough. I use a  pump just like this one to empty an awkward bilge space on my 31 foot sail boat. Rain water collects in a really small area under a bunk and this is ideal for such a task sucking it dry in seconds. I do find the hose to be a bit of a wild thing sometimes and can be difficult to make sure it stays in my bucket, but it’s really simple and does the job really well. Just beware of that flexible hose. It’s like a baby elephant trunk spraying water all over the place if you aren’t careful.

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Ranking The Best Boat Bilge Pumps On The Market

Rule 2000 Non-Automatic Pump

Johnson Pro-Line Marine Pump

Shoreline Marine 600 Pump

If you’re a regular boater you’ll know just how persistent water can be. Even the best sealed hulls can be penetrated. Water finds a way of ending up in your hull; it can be rain water, it can be the result of a rogue wave or two, and sometimes, it can be from a leak. While a bit of rain and a small puddle of water from a wave won’t sink you, they’re not ideal to have standing around.

Excess water can cause your boat to become unstable. It will be harder to handle and may not respond to your steering so well. And that’s why you need a bilge pump. A good bilge pump will keep your boat water-free and running true. That’s why we’ve put together a helpful list of the best bilge pumps currently for sale!

But before we get started, what is a bilge pump and what do you need it for?

What Is A Bilge Pump?

A bilge pump is a special device that safely removes water from the bilge section of a vessel. The bilge is the lowest interior part of a boat’s hull. It’s where excess water collects, usually rain water or from waves. A pump’s job is to remove that water using either pressure or a vacuum-like suction, and pumping it overboard. Too much bilge water can cause a boat to sink. And that’s not what you want!

Do you need one though? Yes. Having a bilge pump is a good idea, even if you only own a kayak or a little rowing boat. Small hand bilge pumps are great for that. If you have a large boat, then you’d certainly need one. If you have a very large boat with multiple hull compartments, then you’d probably need one for ever compartment too.

But which pump is the best one to buy?

Rule are an industry leader when it comes to marine pumps, so you can rely on the quality of their products. This pump, the Rule 2000, is a versatile pump that can be used for a wide range of applications and vessel sizes. Ideally suited for boats up to 28 ft, the 2000 model is able to pump water up to 10ft in height vertically, or up to as much as 20 ft both horizontally and vertically.

The Rule 2000 bilge pump isn’t automatic, so it needs to be paired with a sensor or a float switch. You will also need to fit it to a panel-mounted on, off, and auto, switch to make the most of this pump. It’s available with three voltage options, 12 volt, 24 volt, and 32 volt.

It’s a highly efficient pump that’s completely submersible, and as its name suggests, it’s capable of pumping up to 2000 GPH, which is an absolutely enormous figure compared with other pumps on the list. If you have a large boat, this might not be enough, but Rule have a number of larger sized pumps that will certainly meet your requirements.

Compared with some others on the list, this is quite an expensive product, but it’s worth the money. Many reviewers have tried cheaper products, and with some degrees of success too, but many of them find themselves coming back to Rule bilge pump products time and time again.

• Buy on Amazon   →
• Buy on Walmart   →

Very powerful pump with compact design

100% submersible pump

3 Year manufacturer’s warranty

Pump Capacity: 2000 GPH

This Johnson bilge pump is a great all ‘rounder. It boasts impressive statistics, comes at an affordable price point, and is built to the high standard that you’d expect from a brand like Johnson Pumps of America. It’s manually-activated pump with a decent flow rate, wrapped in a compact package with easy installation.

It’s a fully-submersible pump with an output of 750 GPH. Each pump comes equipped with ignition protection, anti-air lock protection, and a ¾ inch outlet diameter which can accept after-market hoses with ease, should you want to move the outpouring water to a specific location. It also features a base strainer to help keep the pump clean.

Since it’s a manual bilge pump, it needs to be turned on before it can operate. However, it can easily be turned into an automatic device by installing a float and a float switch.

Each pump passes through a rigorous quality assurance process before being shipped, with each product being 100% factory tested. The reliability is one of the reasons that many boat operators choose this unit. That, and the fact that it’s often a perfect replacement for OEM pumps.

It also ships with a 3 year warranty, which should make this inexpensive marine pump an appealing purchase.

• $40.09 Walmart   →

Low-maintenance, high-performance pump

Anti-airlock protection

3 year manufacturer’s warranty

Pump Capacity: 750 GPH

This small pump is the best automatic bilge pump if you’re looking for an inexpensive, small, and compact pump with a modest pumping capacity. It’s fully submersible too, which means you don’t have to worry if you need it to operate underwater.

It’s very simple to install, and doesn’t require too much technical know-how to get it running. It features marine grade bilge pump wiring, a low operating current, and ignition protection. It’s a manual pump—meaning that it needs to be switched on to operate—but it can be made automatic with the installation of a few extra parts. A float and switch is required if you’re hoping for automatic operation, so factor that into your costs.

Each pack comes with a mounting bracket, stainless steel hardware, tinned marine grade lead wires, a universal mounting base, and a wiring diagram to help point you in the right direction during installation.

Though it’s rated at 600 GPH, many reviews have stated that this figure might be a little optimistic. However, if you’re looking for an inexpensive pump that will do the job, but perhaps not as fast others, this is the one for you—providing that you’re only operating a small vessel though.

• $24.99 Walmart   →

Universal mounting system

Hose attachment for ¾” I.D. bilge hose

Quiet operation

Pump Capacity: 600 GPH (claimed)

Seattle Sports Paddler’s Bilge Hand Pump

We decided to kick-start the list with a manual bilge pump. It’s not automatic, electric, or powered by anything except from your own sweat and elbow grease. This budget-focused hand pump is perfect for clearing small volumes of water that may have infiltrated your hull.

The actual pump is fairly simple to operate. It sucks in water when you pull the handle, and disperses it when you push it down. It has been designed to accommodate a hose if you need to move your water to a specific location. The ergonomic handle is coated in an easy-grip rubber for comfort, making it breeze to use, even in challenging conditions.

Seattle’s sports pump is 12 inches long, with a diameter 1.75 inches. It features a special foam collar that keeps the pump afloat if it accidentally falls overboard, with a high-visibility neon yellow finish to make it easy to spot.

The Seattle Sports Paddler’s pump is capable of displacing up to 480 GPH, but achieving that kind of performance demands constant pumping, so it’s not actually for large water craft. However, these small devices are ideal for a kayak bilge pump, or for small inflatable boats. They can also be used as a backup pump for larger vessels, but we don’t recommend relying on one of these in an emergency.

Easy-to-operate hand pump

High-visibility finish

Floats on water

Pump Capacity: 480 GPH

SeaSense Bilge Hand Pump

Next, we’ve got another hand bilge pump. In truth, this model from SeaSense is very similar to the Seattle pump listed above, but there are some differences that might make it a more suitable option for some boaters. Since hand pumps are fairly rudimentary there aren’t many features that make one better than other.

The SeaSense pump has a tubular shape with a large pumping handle. The handle isn’t particularly special but it’s comfortable enough for repetitive pumping, and large enough to fit most hand sizes. Like most hand pumps, you pull the handle to draw in water, and push it back down to push the water out. This one comes with its own hose though, so you don’t have to attach your own. The ribbed hose is 36 inches long, and screws directly into the pump.

If you pump for around 3 minutes with moderate effort, it’s possible to displace up to 40 gallons of water—which is quite efficient. It’s actually possible to displace up to 800 GPH, if you’ve got the energy to keep pumping for a full hour.

One of the best features of this pump is that it comes in a variety of sizes. This means you can select a model with the right length and diameter for your needs. Naturally, if you choose a larger diameter that displaces more water per pump, then you’ll have to pay a little bit more for the pleasure.

Inexpensive pump for small vessels

36 inch hose as standard

Lightweight and easy to store

Pump Capacity: 800 GPH

Attwood Sahara Automatic Marine Pump

This Attwood bilge pump is an ideal choice for those looking for a pump with automatic activation. It switches on when it interacts with water, sucking out any excess water when necessary, leaving you to focus on other tasks, or relax. It’s an affordable low-maintenance, low-effort solution.

Attwood has been at the forefront of marine technology for over 100 years. The brand has developed a reputation for the manufacture of reliable and high-quality marine goods, from efficient fuel systems to swim ladders and lighting. You can really rely on their products.

The Sahara model is more than capable of shifting a lot of water in a hurry, so it’s a good product for those with larger boats. It’s rated at 1,100 GPH at full flow, and there aren’t many pumps at similar price points that can boast that kind of performance.

Each pump ships with wire seals, a strainer for filtering out large particles, and an all-in-one mercury-free switch gear. It also comes with 39 inches of 16-gauges tinned and caulked copper wire to aid installation. The actual installation is quick and easy, with the pump and switch fitting into the smallest spaces.

This excellent 12 volt pump is reasonably priced and offers big performance.

• Buy on Bass Pro   →

High-capacity pump for vessels over 20 ft

Automatic, hassle-free operation

Easy installation

Pump Capacity: 1,100 GPH

Eco-Worthy Submersible Boat Bilge Water Pump

For boaters in need of a large volume pump but with tight budgets, the Eco-Worthy water pump is an ideal solution. It boasts a flow rate of up to 1,100 GPH, and it costs less than $25. Even if the product doesn’t tick the right boxes, you really can’t complain about the price.

The flow rate is impressive, but the overall power of the pump is pretty good too, being able to pump water up to 13 ft without struggling too much. For a small 12-volt pump, it’s quite the over achiever.

One of the most talked about features of this pump is the fact that it runs very quietly. In fact, it’s almost silent (if properly installed) and vibration is at a minimum. Maintenance is also fairly quick and painless thanks to the addition of snap-lock strainers, which filter out any detritus and keep your machine running smoothly.

It’s a submersible pump, so it’s built with tough components to defend against harsh marine environments and salt water in particular. For example, it features moisture-tight seals and washers, ignition protection, rust and corrosion protection, stainless steel components, and anti-airlock technology. It can handle the conditions, and the tough components ensure that it will have a long life.

 Amazon  →

Manual pump, but can be made automatic with float switch

High-quality rust and corrosion-proof components.

Pump Capacity: 1,100 GPH (Claimed)

DasMarine 3000 GPH 12V Pump

Lastly, we’ve got this fairly heavy-duty pump from DasMarine. This is a fully-submersible 12 volt pump that’s tough, efficient, easy to install, and relatively inexpensive. Yes, there are cheaper products out there, but there are also more expensive ones too. If you’re looking for a reliable pump that can be used for a wide range of marine applications, then this is a good one to own.

The pump is made from a number of durable, waterproof, rustproof, and corrosion-proof materials, including plastic and stainless steel. It’s built to withstand high-impacts, resist the effects of salt-water, and keep out any unwanted debris or detritus. It has a very useful quick-release strainer for that reason!

DasMarine’s pump claims to displace up to 3,000 GPH, which quite a high-capacity output for such a small machine. It pumps water well, but won’t drain your battery in the process either, since it boasts an efficient, low current draw. Other cool features include ignition protection, water-cooling for the motors, anti-airlock protection, and assurance that it won’t burn out when run dry.

For those looking for a supremely efficient pump that runs silently and vibration-free, that won’t fall apart the minute it’s up to its neck in water, then this is a product worth considering.

Highly efficient low current draw

100% submersible

Versatile, and can be used for boats, spas, bait tanks and more

Pump Capacity: 3,000 GPH (Claimed)

Bilge Pump Buying Guide: All You Need To Know

Now that you’ve got a snapshot of some of the best products on the market, how do you know which one will suit you best?

We’ve put together a short buying guide that covers all of the most important features to look out for when choosing a new pump. Not all pumps are the same, and different types have different strengths and weaknesses. This is just a quick outline of the different types available and what important features that you need to look for, but armed with this knowledge, you should be able to find a pump that suits your needs, fits your budget, and keeps your bilge as water-free as possible!

The Different Bilge Pump Types

For small vessels, a hand pump is fine, but for bigger watercraft, an electric 12v bilge pump will be better. Electric pumps come in a couple of different styles. For the most part, how they operate isn’t that important but we’ll mention the two types before carrying on with the buying guide.

Centrifugal Pumps

Centrifugal pumps operate by using kinetic energy via a rotating impeller. This draws water into the turbine on one side, and discharges it out of the other. These pumps are submersible but they’re not self-priming—that means that they need to be in water to operate. These pumps are easy to maintain, relatively cheap, and have a great output rate.

Since they agitate the water as they process it, any water with oil traces can quickly turn to goo, making the pump almost unusable.

Diaphragm Pumps

Diaphragm pumps are like little aqua vacs. They use vacuum technology to pull water into an intake, and push it out the other side. They don’t need to be submerged to operate (they are self-priming), and they can run dry without causing damage. They can push water to higher heights than centrifugal pumps, but they suffer from a slower flow rate, and can’t handle any dirt or debris.

So what type should you use? For small craft, a centrifugal pump is the king. It can shift water easily, and do it well. Larger craft may want to have a diaphragm pump, but with a centrifugal pump as a backup. But there are other pump details that you should think about before investing.

What Kind Of Pump Do You Need?

Hand pumps are best suited to kayaks, canoes, and small boats. They’re designed to deal with small volumes of water, like a puddle of rain water in a hull, or a few splashes from a rogue wave. They operate like a bicycle pump, and don’t rely on any external power other than your own muscle. These pumps are cheap, practical, and very useful.

Manual Pump

Manual pumps, or rather manual electric pumps, are small compact pumps that sit in your hull, and only begin pumping out water when you switch them on. These pumps are great, and since they don’t rely on any special floats or sensors, they’re very easy to install. Pumps like these are often inexpensive and quite durable too.

Automatic Pump

Automatic pumps require the use of sensors of a float switch, which detect the water level and switch on to deal with it instantly. These pumps are great for those who don’t want the hassle of manually turning things on. They’re not 100% reliable though, so it’s a wise idea to buy one with a manual switch installed so that you can turn it on when you need it.

Features To Look Out For

The flow rate of a pump is the speed and volume that it moves water from one place to another. Generally, this is measure in GPH, or G allons P er H our. This is one of the most important features to pay attention to.

The GPH is important but the number printed on the box isn’t going to be accurate. 500 GPH suggests that a pump could move 500 gallons from one place to another in 60 minutes. Unfortunately, real word conditions and other variables affect that figure greatly. The depth of the water, the length of the hose, the strength of the voltage…these things will reduce a pump’s real pumping power considerably. Always expect far less than quoted.

Still, these figures give a good indication of a pump’s capability. For boats up to 18 ft, a 500 GPH pump will do. Up to 22 ft, you may want to consider a 700 GPH model. All boats over 26 ft will need something over 1,000 GPH at the very least. The more gallons a pump can shift, the better, but for the best results, it’s always wise to have two pumps on the go, rather than just relying on one.

Really small craft, like kayaks and row boats are fine to operate with just a hand bilge pump.

Installation

With all that talk of voltage, wires, sensors, and floats, it’s always a good idea to look out for a pump that you are comfortable with installing. Electrics can be a dangerous game, so if you’re not confident with wiring, or understand the basics of circuitry, it might be best to shop for easy plug n play pumps that don’t require any complex installation or any wild modifications to fit your boat hull. Fortunately, there are plenty of pre-packaged, easy-installation models out there.

Water Compatibility

Next, you should think about the kind of water that you’re sailing on. If you’re a coastal cruiser, having a bilge pump that’s not designed to work with salt water could have disastrous consequences. Salt water can attack components, rusting and corroding them. A rusty and corroded bilge pump isn’t going to be much use.

Even if you don’t deal with salt water, look for pumps with high quality components that can handle salty and dirty water. Oil can often get sucked into pumps too, which causes poorly made machines to gum up and fail. Stainless steel fittings, tough plastic, and strong rubber seals are very important things to keep in mind.

Electric pumps that have automatic settings require switches and sensors to operate. If you’re looking at an automatic pump, you need to make sure that it comes complete with all the relevant switches and floats. If it doesn’t, then you’re basically buying a manual pump, and you’ll need to source and install the switches and sensors yourself.

Always make sure you know what you’re buying. If in doubt, read the reviews; if a product comes without the things you’d expect, you can bet that someone in the comments and reviews section has mentioned it. Probably quite explicitly too.

Sound & Vibration

Another feature to check the comments section about is the amount of sound and vibration a pump makes. While it’s hardly the most important feature of a pump, a noisy pump with too much vibration may drive you mad in the long run. If a sound annoys you, or a vibration bothers you, then it will make you hate using your boat. It’s best to look for a quiet bilge pump that won’t drive you insane. The reviews will give you real insight into the noise levels of a pump. No manufacturer is going to go out of their way to state that their product is a noisy machine.

Portability

Do you want a pump that you can use for a variety of vessels? Or do you need one that’s going to be bolted down and hard wired into your ship’s hull? If you own a number of boats or kayaks, then something that’s small, easy to remove and install, and compact enough to be moved around will be a better investment. Usually, the more portable a pump is, the less powerful it is.

What Is The Best Bilge Pump? In Summary

Even with all of this information and following our buying guide, choosing a pump that suits your needs is no easy task. To make life a little bit easier, here are our top favorites, the best of the best, as it were. Here’s the TL:DR summary for the best of the bilge pumps:

The best bilge pump for boaters on a budget is the Shoreline Marine 600. It’s a small and compact, fully-submersible, automatic pump that has a decent flow rate of up to 600 GPH. Technically, it’s actually a manual pump, but it’s designed to accommodate a float switch that can make it automatic. It’s very cheap, so the fact that you might have to buy a few extras shouldn’t put you off of buying this great little pump.

If you’ve got more cash to play with and you’re looking for a heavy-duty pump that will do the job and then some, then the Rule 2000 is the way to go. Designed for large vessels of over 28 ft, the Rule 2000 can competently shift water in high volumes to heights of up to 10ft and up gentler inclines to over 20ft. In all, it boasts 2000 GPH, and if that’s not enough, Rule sells bigger pumps for even bigger performance.

But if you’re looking for the best pump overall, then we would have to recommend the Johnson Pro-Line marine pump. It’s a submersible, manual pump that can be turned into an automatic one. It’s versatile, compact, and comes with impressive performance and some useful features. The flow rate is 750 GPH, it has air-lock protection, ignition protection, a generic hose-attachment, and a removable strainer.

And if that wasn’t enough, it ships with a 3 year warranty from the manufacturer, which means that it’s a product that you can have confidence in!

Joe Appleton is an outdoor enthusiast who loves everything from bushcraft and hiking to wild camping and boating. If he’s not out in the woods, you’ll find him out on the water.

Categories : Boats

Robert Hogward on June 27, 2021

I found your article very informative. Without the pump, the water will not move out of the tank. However, choosing a fresh water pump is overwhelming. There are many variables to take into account, from capacity to noise. Again thanks!

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Bilge Pump Installation and Maintenance Tips

The best bilge pump in the world wont keep your boat dry if its not properly installed and maintained. While bilge pump installations are fairly straightforward-and definitely within the scope of DIY projects-there are several factors to consider (capacity, wire size, hose diameter, fuse size) before you begin, and there are some good rules of thumb to follow.

CHOOSING AN ELECTRIC PUMP

The first step is selecting the right bilge pump(s) for the job. We recommend installing two electric centrifugal pumps (preferably one with automatic water level sensor): a smaller pump mounted at the belly of the bilge to handle the incidental bilge water (rain, stuffing box drips, etc.) using minimum power and another pump mounted a few inches higher to handle bigger jobs. There are several reasons for this; the main one being that a back-up is always installed should one pump fail.

Capacity: For most mid-sized boats (30-35 feet in length), wed recommend a 1,000-1,500 gallon-per-hour (GPH) pump for the primary and one with a capacity of about 2,000 GPH for the backup. The American Bureau of Shipping recommends one 24-gallon-per-minute pump (roughly 1,440 GPH) plus one 12-GPM (720 GPH) pump for boats shorter than 65 feet.

When comparing output specs on multiple pumps, be sure the rating criteria are the same. New standards set by the American Boat and Yacht Council (ABYC) require that compliant makers rate pump capacities so that they reflect real-world usage. The ABYC stipulates that pumps be rated with a head height (also called vertical lift) of 1 meter and a hose length of 3 meters, and with a head height of 2 meters and hose length of 6 meters. Head height is the vertical height of the hose outlet above the pump outlet. Head pressure (also referred to as static head) is the resistance that a pump has to overcome when pumping water up and out of the boat. It includes the resistance generated by the vertical distance the pump has to move the water up (vertical lift) and any resistance generated by the discharge plumbing (hose kinks, ribbed hose, fittings, and bends). Some ratings also will be given at 13.6 volts, rather than the more realistic 12.2 volts (for a 12-volt system). The latter will more accurately reflect capacity in real-world conditions.

Key features: An automatic pump will rely on a water-level sensor such as a float switch to activate the pump. This can be a separate unit or one that is integral to the pump. This sensor should resist fouling and be easy to test for proper operation. Common float switches should be in a housing, otherwise they are more prone to fouling by debris in the bilge. An easy-to-access strainer (or strum box) is also important, as are long wire leads, which help keep connections out of the wet bilge area.

INSTALLATION

The illustration above shows one recommended setup for automatic bilge pump installation.

Location: According to the ABYC, the pump inlet must be positioned so that bilge water can be removed when the boat is in a static position and when it is at maximum heel (ABYC H-22). The mounting location also should make it easy to service the pumps and to clean them, particularly their strainers.

The discharge outlet (thru-hull) must be above the maximum angle of heel so that water outside the boat is not siphoned inside the boat. According to ABYC H22, if you can’t position the discharge this way, a vented loop (installed above the heeled waterline) and a properly installed seacock must be included in the setup. (Check-valves should not be used in this scenario.)

When installing two electric pumps, the lower-capacity pump should have a built-in float switch, be mounted at the lowest point of the bilge, and be wired straight to the battery through a fuse. The higher-capacity pump is installed a few inches higher, but not directly above the smaller pump. As the illustration shows, you can mount the larger pump to a piece of plywood thats bonded to the bilge sides. It should be wired to a dedicated breaker, which can be used as a switch, or it should also be wired to a dedicated, clearly marked toggle switch.

Plumbing: When plumbing an electric bilge pump, be sure the setup is designed to reduce head pressure as much as possible to maximize discharge capacity: use smooth hose sized to meet maker recommendations; keep hose runs as short as possible; and try to avoid bends, turns, and elbow fittings in the run. In terms of adding resistance, using a 90-degree bend in a 1-inch-diameter discharge hose is the equivalent of adding 3 feet of hose to the line, which is like a 3,000 GPH pump being reduced to a 2,000 GPH pump, if the battery is fully charged. According to pump maker ITT/Rule, small electric submersible pumps are rarely useful with more than 4 feet of vertical discharge head and medium/large submersibles are similarly ineffective with more than 7 feet of head.

The discharge line should rise steadily to the through-hull or loop. If there are any low spots in the run, water will pool there once the pump cycles off. This can create an airlock when the pump is activated again, and the pump likely will stall. Hose connections, as recommended by the ABYC, should be made with non-corrosive clamps and should be airtight.

Wiring: Use correct size wire and fuses: The proper wire size reduces voltage drop and properly fused wiring reduces risk of a locked rotor (a motor thats trying to turn, but can’t) causing an overcurrent situation and potential fire hazard.

Consult the American Wire Gauge 3% voltage drop table (www.marinco.com/page/three-percent-voltage) to be sure you’re using large enough wire. Remember that the run length given in wire-gauge tables is the sum of the positive and negative legs of the circuit; a pump 10 feet from the battery will be referenced as having a 20-foot wire run.

For the fuse size, simply go by the pump makers recommendation, and you should be set. The fuse, per ABYC standards, should be installed within 7 inches of the power source.

If the pumps leads are too short, extend them carefully. Use oversized tinned marine wire and adhesive heat-shrink connections. ABYC standards recommend using a length of water-resistant electrical cable, sealed at the pump connection, so all electrical connections can be made above the max bilge water level.

Accessories: A few accessories to consider adding to the bilge pump system include a visual/audible bilge alarm, bilge switch, and a cycle counter. ABYC standards require an alarm on boats with enclosed berths. Be sure that the alarm is loud enough to be heard over engine noise while underway and ideally by passersby or marina personnel when docked.

Automatic pumps should always be fitted with a readily accessible and clearly marked manual switch so that even if the owner isn’t around, anyone (crew, marina neighbors, or passersby) can locate and activate the switch when the need arises. Switches also should offer visual indication that the pump has power supplied to it. Our top pick for mercury-free bilge switches, reviewed in the January 2006 issue, is the electronic Water Witch 230.

If the larger-capacity pump has a float switch, we highly recommend connecting it to a bilge alarm (and alarm cut-off switch). That way, hopefully, the horn will get someones attention before the constant cycling of the pump drains your batteries. We reviewed the Aqua Vigil Alarm in the May 15, 2001 issue, and deemed it simple but quirky. We plan to revisit bilge alarms and cycle counters, including combo units like the Aqua Alarm pump monitor, alarm, and counter.

Two good references on bilge pumps and installing them are This Old Boat by Don Casey and Nigel Calder’s Boatowner’s Mechanical and Electrical Manual .

MAINTENANCE

Regular and frequent inspections of your bilge pumps are a must and should be included in the vessels overall preventative maintenance program. This helps you know when to replace worn or damaged components (bad float switches, deteriorated hoses) before they fail. Before you set sail, its always a good idea to make sure the pump has power and is working properly, keeping in mind that testing should verify the actual pumping of water overboard, rather than (in the case of electric pumps) simply switching the pump on and listening for motor operation.

Keeping your bilge clean can be a hassle, but it doesn’t compare to the headache of a locked rotor or an impotent bilge pump in an emergency.

For more details on specific pumps, check out our most recent tests of high capacity bilge pumps of greater than 1,500 GPH , and and smaller pumps rated at 1,500 GPH .

For more comprehensive guidance in carrying out an upgrade of your boats essential systems, check out our 5-volume ebook series on Marine Electrical Systems at https://www.practical-sailor.com/products .

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24 comments.

From bitter experience on my Olsen 34 the pump discharge point should be well above the water line. On the Olsen 34 they put the discharge on the port side at the stern. Even though there was a loop, when the boat was heeled on a starboard tack the discharge went under water and slowly back flowed thru the discharge line. Adding a check is one idea but they create a lot of pressure loss and a debris trap that can plug the line just when you need it the most. Better idea is to put the sump discharge point on the center line well above the water level when heeled.

I am a marine technician and am frequently dealing with bilge pump failures. I agree with most of the comments made here. I personally do not like bilge pumps with internal float switches. They are more convenient to install, but how do you test them? I like to be able to physically lift the float switch to test the pump system. This cannot be done with internal float switches. Some, but not all bilge pumps with internal float switches have a button for testing…. does anyone know how these work…. what are these really testing???

Second comment…. the electrical connection adjacent the pump. I like to use a 4 circuit terminal block to connect the seven wires ( bilge pump(2), float switch (2), manual +ve, auto +ve, and ground) together. This should be mounted as high as possible. And do not forget heat shrink on all connectors. This makes troubleshooting with a multi meter so much easier when something goes wrong. Cutting into heat shrunk butt connectors is time consuming and requires repairing after the troubleshooting is complete.

For boats with a deep bilge, the best option is a diaphragm pump located above the bilge and wired to a float switch. Better yet are two! An event counter and an audible alarm or beeping device is critically important. It should be audible when motoring or under sail. I use a “truck backing up beeper” wired in the circuit. An additional high water siren on a separate float switch completes the setup.

I’m a ~25 year fan of a dry bilge using a whale gulper pump with a water witch sensor. I’ve mounted the sensor face down against the bottom so it senses at minimal water. The ability of this diaphragm pump to suck water and air, or both, and the 15s off-delay provided by the water witch ensures it will scavenge the bilge dry. A few inches higher I use a Rule 3700 vane pump. I refer to this as the crash pump, and I’ve drilled a 1/8” hole in the discharge hose next to the pump outlet to prevent a fatal airlock. I’ve always had pump cycle counters and an alarm if the crash pump ever runs for 15s. And it’s connected to my on board security system that’s monitored by a central station thru a cellular connection. The security system also reports low voltage. (Hello? Most boats that sink do so at the dock, often with no one nearby.) I always check and reset the counters first thing in the morning or when I arrive at the boat. And I always test the system at annual launch. Overkill? No such thing. More recently I added a Legend PVC T-655 ball check valve in the whale pickup hose because I got tired of changing its duck bill valve. With this config the odds of a failure before it’s too late are almost nil. I think ABYC standards are inadequate—the first task is to keep the water out. Hope that helps.

A good article, but I do notice that PS articles sometimes reference material from many years ago, ala “…reviewed in the January 2006 issue, is the…”. I have seen several references in various articles and wonder if the technology has changed, or other standards have changed since some of these original reviews? Thoughts?

Good article. However, seems a little disconcerrting

A 2” hole 3’ under the waterline will allow 8,340 gal. of water/hr to enter your boat, regardless of how many bells and whistles you’ve added to your system. Bilge pumps are adequate for nuisance water, nothing more. You better have plans for plugging holes and an EPIRB handy for anything else. Just my opinion.

The article recommends using a manual switch for the high capacity pump. An alternative is to install an automatic switch, placed high enough in the bilge so that it will not trigger in ordinary circumstances. Wiring in an audible alarm will alert you to high water. If it is loud enough, it could attract attention from others at your dock or mooring field.

I disagree with the recommendation in this article to have the automatic bilge pump deep in the bilge and the manual higher up. I had an automatic bilge pump get stuck on and run the battery dead several times. I think switch failures in those pumps happen often enough that I don’t want the automatic as the primary. Incidental rain water etc. is easy to remove by switching on the manual pump. You want the automatic for times when water is coming in unexpectedly while you are not below to notice it. I have had that happen several times, and the primary in the bilge handled it just fine once switched on. I am not even sure I would want the backup automatic because that might have allowed me to miss the water accumulation. You don’t hear the pump if the engine is running. As John noted, if you have a serious hole, these pumps are not going to keep the boat from sinking.

If the pump intake is in the bilge on centerline and the boat is severely heeled like in knockdown (a sister ship sank from knockdown on a lake) and water has poured thru the companionway, the water inside is all on one side and may not reach the pump intake on centerline. So? Two pumps, one each side? Overkill? Enough battery power to move that much water? The first task is stop the ingress of water, get companionway closed and get boat at least partly upright. Assuming one manages to get boat upright, whether fixed keel or swing keel trailer sailer, there is still a massive amount of water has to get pumped out fast. A 2000 GPH pump is only 30 gpminute, actually less. Two of them 60 gal per minute. Also, at some point aren’t batteries going to be submerged and short out? Or just run down from high demand from pumps? So: location of intake hose(s) at severe heel? GPH? Battery short out or rundown? Overkill?

On my endurance 44, for offshore, I used a decent sized electric pump with check valve, a counter, and a separate high level audible alarm, two feet higher than the regular pump float switch/alarm. I also carried a separate gasoline powered pump with 1 1/2” hoses complete with strainer and fire hose connection available. It sucker a lot of water and with the firehose connector, could be used to fight fire and would shoot water about 50’ effectively. The hoses were long enough to put the pump on deck and to be primed from there. This is a good water evacuation plan in an emergency if tested regularly. I had a 2.7 hp kubota lightweight setup. Inexpensive and very effective. After that, it was a 20 litre bucket!

I have a 1990 Alden 44 with a deep narrow bilge filled with a centerboard hydraulic slave cylinder and have been using a diaphragm pump as Bob described above. I always found the Achillies heel to be the float switch which was bulky and typically failed in one to two years. I have since changed to a water pressure switch. The cup is placed in the bottom of the bilge on a 1/2″ square piece of starboard connected to a vertical PVC tube, held in place by a hose clamp. All the mechanical parts are mounted just under the floorboards where they stay safe and dry. I can clean the cup by loosening the hose clamp and lifting it out. This solution has been working great for me for 6+ years without a failure.

After dealing with faulty water sensor on my Rule bilge pump that drained my battery, i plan to change over to a diaphragm pump with an external sensor/switch that can be properly cleaned or replaced, any recommendations?

Ric, interesting. I have just done the opposite. we had the DIAPHRAGM pump high in the bilge with a pickup tube to the lowest point along with a WaterWitch 100 series mounted at the very bottom, to keep the bilge dry. had this set up for 10+ years. then the pump(s) kept losing prime once we became much more active cruisers. constantly battling as to why over a period of 5-6 years. replacing pumps. dealing with possible air leaks in the strainers. contamination in the rubber flappers in the pumps themselves, which I was told by Jabsco are extremely sensitive.

We have found diaphragm pumps difficult to maintain, and ironically easily lose prime when they are supposed to be self-priming. the Centrifugal pump, although not self-priming are more reliable since they prime in the presence of water. which is the only time you want them primed.

A few weeks ago I ripped all that out and went with a Rule 500 GPH electronic water sensing CENTRIFUGAL pump. no more wire mesh external strainer to constantly clean. mysterious losses of prime. extra plumbing fittings etc.

Yes, the Rule 500 GPH comes on for 1 sec every 2.5 mins to check for water, but I never hear it (wife does but I can turn it off at night). Its wired to an activity light which is nice to notice when it blips on. that confirms its operating which I like.

my 2,700 GPH Rule crash pump has a WaterWitch 230 and an alarm if it comes on.

I appreciate the reminders in these comments that bilge pumps are only good for small leaks that might sink your boat.

a Crash Pumps just buys a little time if its a big leak.

The pressure switch that I have been using which I referenced above is a Groco AS-100. The pump I use is a Jabsco par max 4 diaphragm pump.

The Jabsco is a 31705-0092.

On passage recently our 5 yr old Water Witch sensor fired off our 11year old Rule 2000gph with an audible alarm. It’s so long since we installed and its never fired off the we were unsure what it was! Of course we test regularly, but it was a surprise just the same. This may be testement to a very dry boat, but also an indicator that both the pump and switch have lasted the test of time. It was a leaking raw water pump in the engine bay after a 12hr motoring run.

I would like to install a secondary bilge pump with an automatic switch so when I more my boat and we get a lot of rain I don’t need to worry about having to use my manual bilge pump If I route my outlet line into my manual outlet line do I need a check valve in one of the water lines

How do you install bilge pumps in a shallow draft 40′ sailing catamaran when there is only a few inches of bilge below the flooring/soles? I would like three in each hull – 0″, 6″, & in engine compartment – plus manual pumps. The engine compartments should be ok and the manual pumps can be mounted higher, between the bottom strainer (strumboxes?) and the thru hull. Can automatic electric pumps be mounted above the LWL with a reinforced hose leading to a strumbox under the floor?

Answering my own question. After several days of research, I discovered the Rule LoPro (Low Profile) 900 GPH pump. Its installation manual even has a chart showing the flow/head curves at 12vDC for each of the three hose size options.

Regarding the question asked above, about how to test automatic bilge pumps (those with internal switches): most of these small pumps have a test knob that has no other function than to allow the user to rotate the float shaft, just as it would rotate if the water level were rising; thus both the movement of the float itself and the movement of the switch plus motor assembly can be tested. Good winds and lots of water under the keel!

I agree with John Russnogle’s above post. Bilge pump(S) are likely unable to cope with a major hull breach, or even a dropped shaft. If the water ingress cannot be slowed at the source, a life raft might be the best back up if offshore. For power boats, there is yet another emergency option. I have installed commercially made diverter valves at the raw water strainers, with large diameter hoses positioned to pull engine cooling water directly from the bilge. Heaven forbid that I ever need to test the capacity of this arrangement, but I have no doubt that twin 315 hp diesel pumps will beat my three electric bilge pumps.

Very informative article but one other factor should be taken into account in my view. Non live-aboard boats are usually left unattended at a mooring far longer than they are with someone aboard. If a leak develops the pump will keep pumping until the battery dies. All else being equal, a more efficient pump would discharge more total water than a less efficient pump until that happens. One way efficiency can be estimated is by calculating gallons flow per amp draw. There should be a column in bilge pump comparison articles showing gal/amp. That’s the basis I used to select an additional emergency 2000 gal/hr bilge pump with WaterWitch switch for my Beneteau 44.7 that came from the factory with manually switched bilge pumps with about 350 gal/hr total capacity! So far the new pump has not had to run in anger but I’m confident if it does it will pump the most gallons of water for as long as the batteries last. Hopefully that may be long enough for someone to notice and take action or call me. Simon Zorovich PoleStar Staten Island, NY

I’m refurbing a 27′ elderly grp sailboat with a deep bilge in the rear part of the encapsulated keel, and I need to spec and install at least two electric bilge pumps – large and small. The pros and cons here of auto-sensing are interesting. I learned long ago the habit of using a manual pump on joining a boat, then twice a day, counting and logging the ‘full’ strokes to assess whether anything had changed. What does the hive mind think?

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10 Best Bilge Pump for Boats – (Reviews & Buying Guide 2021)

Having a boat is a pretty good way to relax and spend your free time in the water. But the boat as every other object needs some supplies. One of the most serious points about the ship is the bilge pump. Having the best bilge pump is just a thing that helps you with the best experience you can have. Having it is essential as it is not only a matter of excellent performance but is often a matter of safety as well.

What types of bilge pump can you find? What are the benefits of using one? What else should you know about the pumps and their use? Our team has done some research, collect new facts, valuable information and made some bilge pump reviews. All this can help the readers to choose the right one for their boat.

Best Bilge Pumps Comparison Chart

Best Bilge Pump Reviews (New List 2021)

We have compiled a review section specially to make your life easier. The top 10 products that we have selected are not arranged in any order so that we don’t taint your objectivity.

1. Shoreline Marine Bilge Pump

The unit includes a mounting bracket and stainless steel hardware which makes it a good purchase for such a competitive price. Moreover, it comes with more than enough marine grade wire to reach where you need it to go. It has ¾ inches diameter hose which is the standard size.

Another advantage of this bilge pump is that it is quieter than most pumps while in operation. The pump is submersible in the water and needs to be manually operated. However, if you prefer it to work automatically, you can always install a float switch. You would need 12 Volt DC current to power the motor.

• Lightweight and compact
• Able to move water quickly
• Marine-grade wiring
• Lacks durability

2. Seasense Hand Bilge Pump Hose

With a removable hose for secure storage, the hand bilge pump is extremely lightweight weighing only a pound. It resists corrosion and will be durable.

It has a large ergonomic high impact handle with an easy-grip that is convenient to use. The diameter of the pump housing is 2 inches, and the inside diameter of the hose is 1 1/8 inches. The pump is 24 inches long, and the hose is 36 inches long which is an average length for good suction. While using a longer tube is more liable to blockage, there is room to extend it to meet your needs.

• Budget-friendly
• Lightweight
• Ergonomic high impact handle
• Poor hose connection that tends to leak water
• While the pump is durable, the hose is not of good quality

3. Rule Non-Automatic Bilge Pump

With this non-automatic pump, you will be able to pump water up to 10ft vertically and 20ft vertically + horizontally. This particular model does not feature a drain back valve. Will have to make sure your vacuum brake system is fine before embarking. The discharge hose outlet is of decent dimensions given the overall size of the pump. You get a 3-year warranty with that product.

• Budget option
• Easy to carry
• Powerful for its size
• Can’t service larger boats
• No drain back valve

4. Attwood Tsunami Manual Bilge Pump

The pump is operated manually and rated a gallon per hour. It might not be the most durable pump, but it performs efficiently. It requires 12 Volt DC unit and draws 3 amps.

Cleaning and maintaining will be quick and straightforward as the pump inlet screen is easy to remove and you can get rid of any debris it sucks up. On top of that, the motor core is interchangeable and replaceable.

The pump has 1 1/8 inches outlet hose which is a bit larger than the standard tube. While it might be harder to find such a size hose the good part is the high volume output will result in pumping out water faster.

• Interchangeable and replaceable motor core
• Cartridges can be replaced
• Reasonably priced
• Harder to find a hose that will fit the more significant discharge port
• Low flow rate

5. Seaflo Automatic Submersible Boat Bilge Pump

The outlet diameter of the pump is a standard 3/4 inches. It is equipped with an integrated float switch test button. Since it has a built-in switch, no power is used until the water reaches the internal float switch. The pump has ignition protection against a high current.

Another favorable feature is the built-in electronic controlled reed sensor system which makes the automatic operation more reliable and comfortable. The pump can also be used with a switch panel for manual override.

Maintainance of the pump is effortless as it has a quick-release strainer. It also has a watertight seal and anti-airlock protection.

• Water-cooled long-life motor
• Silent and vibrationless operation
• Highly durable
• Reverse wiring which can be confusing while installing
• Not able to fully empty the boat as the pump will switch off when the water drops at a certain level.

6. Johnson Pumps of America Marine Pro-Line Bilge Pump

The bilge pump has an ignition protection feature so that it is protected against a high current. This will ultimately result in higher durability. The pump is tough enough to handle saltwater and includes anti-airlock protection.

It is manually operated unless you install a float switch to make it automatic. The pump is an average size and has a 3/4 inches outlet diameter which is a standard size. It is beneficial because finding a matching hose will be a piece of cake.

The pump claimed to be 100% factory tested, and thus every unit sent out should be in good working condition. Maintenance of the pump is easy due to the base strainer.

• 3-year warranty
• Anti-airlock protection
• High flow output
• Motor lacks durability
• No built-in switch

7. Amarine-Made Marine Electric Bilge Pump

The bilge pump has a high flow rate-1100 GPH  and powered by 12 Volt plug that draws 3 amps only. Depending on your preference you can make the pump operate manually or automatically, either way, the switch needs to be bought additionally as in most cases.

It comes with proper lead wiring that is about 5 feet long. Not only will the installation be easy with the snap-lock strainer base but it will also make maintenance effortless. It also leads to a quiet and vibration-free operation.

The discharge port diameter is specified as 29mm which is equivalent to 1-1/8 inches. It can be a little harder to get such a size hose.

• Ignition protected
• Long lasting motor
• The diameter hose seems to be smaller than the specified size.

8. Rule 24 Submersible Bilge Pump

The pump is powered by 12 Volt plug and rated to have 350 GPH. It might not stand out when it comes to output capacity, but it is very reliable. It doesn’t come with a built-in switch because they are meant to be manually operated. This will involve an additional purchase of the switch, but on the bright side, the pump will be able to get rid of every last drop of water on board.

Installing the pump will be simple as it has a standard size output diameter which is 3/4. Another advantage of choosing this pump is that it has a 3-year warranty. So in case of any malfunction, you are covered. Nothing is surprising when it comes to maintenance as it has a removable base like most pumps.

• Compact and lightweight
• Economically priced
• Low flow rate capacity
• Less durable

9. Rule 1100 GPH Non-Automatic Bilge Pump

The bilge pump has to be switched on manually and needless to say, the switch will be an additional purchase. Depending on its intended use and of course, your preference, you can always add an automatic switch. This will make the pump more reliable and will not fail you in times of need.

As the pump is designed for the bilge, it is fully submersible and has a long-life motor. The height of the pump is 4-1/4 inches and 2-3/8 inches wide and could be categorized as a small pump. It weighs under 3 pounds. Mounting will be reasonably straightforward as it has a detachable base.

• High pumping capacity
• More effort required in finding the right size hose as the discharge port is more substantial than standard size

10. Attwood Sahara Automatic Bilge Pump

The bilge pump is turned on automatically. It has an internal air-filled float piece that triggers the pump once the water level rises to a certain point and will continue pumping until the water level drops down to the shut-off level. You can test the operation to ensure that the switch is working well by merely turning the test knob which makes the air-filled piece float.

The weight of the automatic pump is 1.1 pounds which is considered to be lightweight for a bilge pump. The hose connection is 3/4 inches wide. It is a standard size and will fit all types of hose. There are two mounting holes in the detachable base so that you can mount the pump with ease.

• 16-Gauge tinned copper wiring
• Float switch testing knob
• The float level is set low
• No option for adjustment on the float level

What is the Bilge Pump?

Types Of Bilge Pumps

As every other bilge pump for small boats , you can find different types of bilge pumps. The main thing is to know what exactly do you need for your ship – the size, the capacity and where you will put the pump. It is good to know all the bilge pump basics when you choose your type of pump.

Centrifugal Electrical Pump

Using kinetic energy by rotating, the centrifugal electrical pump move the water just as the turbine. This kind of pump is cheap and runs a lot of water. The maintenance is easy, you can store it for a long time when you are not using it.

Diaphragm Electrical Pump

Here, the pump use vacuum and ‘suck’ the bilge water out. The diaphragm pump is self-priming, and it pushes the water better uphill. It is harder to maintaining and cannot move so much water, but can run dry without any damage.

Benefits Of Bilge Pumps

Both kinds of pumps are designed for underwater use. But safety first! The pump is small just and can be placed almost anywhere at the bottom of the vessel similar to any boat anchor .

Most of the pumps are not expensive. You can find some good pumps at a meager price. It will do the same job, Just make sure you choose the right kind of pump for the size of the boat and the engine.

Portability

The bilge water pump is easy to move. You can store it somewhere else, not in the boat, when you are not using it. Some of the pumps can be stored for a long time without being damaged.

Having a functional bilge pump will make you feel more secure while sailing. You already know, that having liquids on the bottom of your boat, can become dangerous real fast. One of the main pros of having and using the right type of pump for your watercraft is safety. Always check if the pump is working before leaving the wharf.

All the items that we buy have some advantages, but also some disadvantages. Here we have summed some information about the pumps, that will help you to keep your boat safe.

As we already said, these pumps are comfortable to be lifted and stored. But this is a precondition for robbery. Be sure you always keep the portable bilge pump safe! Yes, they are cheap, but theft can cause some severe situations.

Always pay attention to the size and how the pump is working. If you had the wrong one – too small or too big – it would not work fine, so you may have some trouble.

Dangerous Situations

Having two water pumps is essential. One of them can always be damaged, and it is good to have one more so you can use it in case of a break-down.

Here you can see the most essential elements of the bilge pumps. The choice of the right one just depends on these facts.

Choose the right size of the pump so you will have enough space for it and for other supplies you need such as an anchor rope  and others. The size matters – not only it is essential for the amount of water, but also for the free space in your boat.

This one is significant! Always check the output of the pump before buying it. If it is too small for your vessel, it can cause some dangerous situations, because it is not pumping the water fast enough.

Type of the pump is essential. You have already checked the kinds of the bilge pumps, and you know your type of boat. Be sure you choose a centrifugal pump for larger ships and diaphragm pump if you need to push the water uphill.

Maintenance

As you already saw, the support is not something complicated, but now we will introduce you to some crucial details about it. The maintenance of the pump is specific for different kinds of pumps.

• Remove dirt and waste from the place, where the pump is.
• Clean the screen of the pump. The intake screen is essential for the user.
• Always check the electrical connection.
• If you use a diaphragm one, clean it to prevent clogging.
• You can check the manual for some more specific details.
• Maintenance is essential for the life of the pump. Take proper care for it, and it will be reliable for a long time.

Installation

You have bought your pump, and now you need to install in on the boat. Reading the manual from the manufacturer, you will find information about the installation of a particular pump. Here are some more tips for installation.

It very important is to check the electrical connection. If you are not sure about it, always call a technician just to be sure.

It doesn’t matter what brand of pump you have, the installation is essential for efficient use. Do not forget to check the instructions.

Never use a crumpled hose. It can be very dangerous. Choose a smooth one – it will not kink.

If you find any troubles during the installation – call a technician. They will help you. Do not forget – safety is first! The correct installation is essential for proper use.

Safety Tips

Safety is essential for all of us. And protection while sailing is even more critical because, in the sea, we cannot do so many things. We need to be prepared for some situations before leaving the pier. Check some tips our team has collected to help you with the choice, with using of the bilge pump and with preventing dangerous situations.

• Pick the right type of pump!
• Check the pump before leaving the pier.
• Have a spare one in your boat in case of a break-down.
• Place the pump in the right place!
• Take proper care of the pump!
• If you are not sure, if the pump is working fine, call a technician – they will make sure that everything is perfect.
• Always have a secondary one – if you are at the water and the first one breaks down, you can change it. This is life-saver!
• Always enjoy your free time in the water, but never forget the safety. Check the electrical connection.

Well done, you guys, you have successfully finished our buying guide on finding the best small bilge pump . Having read our reviews on the best bilge pump and our additional information and tips, you now realize that finding a reliable product can be a bit hard. It is essential to own the right pump for your boat, do not forget the maintenance and always follow the manual and the safety tips, so you can enjoy your boat and your trip in the water.

If you find our guide useful, forward it to your sailing-loving friends. Also, do not hesitate to contact us – your opinion is important! Comment, sent us an email – tell us what you think!

We hope that you find this text interesting. Find some more free time and check our articles – you can find information about all the marine supplies you need. Thanks for reading and as always – stay put!

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Best Bilge Pumps of 2024

Bilge pumps are definitely not the sexiest part of your boat, and they’re probably the last thing you’d show off to a visitor. They’re also one of the last things you’d want to see fail at a critical moment. Bilge pumps perform a vital function, removing the water that inevitably seeps into your boat from rainfall or waves and through propeller shafts, stopcocks, and other hull openings. Water in the hull can dramatically reduce performance and even lead to foundering, and a good bilge pump system can make the difference between an interesting day and a disaster. Fortunately, we have a variety of pumps to choose from, suitable for everything from day sailors to cruising boats, and there are options out there to suit every boat and owner. This guide to the best bilge pumps should get you started!

For more of our top sailing gear recommendations, check out the Best Sailboat Anchors . 

Quick Answer - The Best Bilge Pumps

• Whale Gusher Urchin View at Amazon
• Seaflo Submersible Automatic View at Amazon
• Rule LoPro View at Amazon
• Attwood Tsunami View at Amazon
• Rule 4000 View at Amazon

Comparison Table - Best Bilge Pumps

Reviews - The Best Sailboat Bilge Pumps

Whale gusher urchin.

• Flow Rate : 14.5 Gallons Per Minute (GPM)
• Submersible : No
• Automatic : N/A
• Switching : N/A
• Through-Deck or Through-Bulkhead Installation
• Pump Head Adjusts To Fit Suitable Space
• Best For Boats Under 40 Feet

BEST HAND PUMP

Back in the days of sail, sailors would spend part of their watch “on the pumps”, manually pumping water out of the bilges. Electric motors usually do that work now, and the command “man the pumps” is not something any of us are likely to hear. Still, any electrical system can fail, and if you need an electric pump you need a manual backup. 

The Whale Urchin is a proven, reliable option that’s become an automatic purchase for many sailors. It’s compact, unobtrusive, and out of the way until you need it, which we all hope you never will! The Urchin is designed for boats under 40 feet. If you have a larger vessel or want higher capacity, look at the Whale Titan , which can move up to 28 GPM.

Note that the rated 14.5 GPM is based on a pump rate of 70 strokes per minute, and it takes a very motivated sailor to sustain that rate. On the other hand, if your power has failed and you’re taking on water, motivation is likely to be pretty high!

Seaflo Submersible Automatic

• Flow Rate : 750 Gallons Per Hour (GPH)
• Submersible : Yes
• Automatic : Yes
• Switching : Internal Float Switch
• Fully Automatic: Turns On When Water Accumulates
• No Power Use Until Water Is Present
• Anti-Airlock Protection
• Can Run Dry Without Burning Out

BEST BUDGET PUMP

If you’re looking for an affordable no-nonsense pump, Seaflo has delivered the goods. This pump has substantial capacity, is fully submersible, and needs very little attention: the internal float valve turns it on when there’s enough water in the bilge to pump (around 1.5 inches), turns it off when it’s no longer needed, and does not draw battery power to run a sensor. You just need to keep the intake screen clear (as with any pump at any price) and do periodic checks to make sure the pump is running. This is a solid value for the small boat owner.

Most reviews of these pumps are very positive, but they are inexpensive units imported from China and a few users have reported receiving defective units. Check yours as soon as it arrives!

• Flow Rate : 900 Gallons Per Hour (GPH)
• Switching : Electronic Sensor
• Low Profile Design For Tight Spaces
• Choice Of Discharge Ports Fits Multiple Hose Sizes
• Rotating Discharge Body To Fit Any Space
• Backflow Prevention Valve

BEST COMPACT PUMP

Many sailboat bilges are low and narrow, and getting a conventional pump into a position where it has access to the lowest point in the bilge can be a real challenge. The Rule LoPro is designed with a low, flat profile that allows it to fit where other pumps won’t and a rotating discharge body that lets you adjust the hose position to fit the available space. Those features make the LoPro an ideal choice for initial pumping in any boat with narrow, inaccessible bilges. 

Pair this with another unit mounted higher up and you’ll have full protection! Rule is a dominant name in the bilge pump market and is known for its high-quality products. The LoPro is no exception, but as with any pump, its life will be shorter in a dirty, oily bilge, and it needs to be installed and wired carefully. Rule’s electronic sensor system relies on a brief pulse of power to check for pressure on the impeller blades every 2.5 minutes. This could cause battery drain and recurring noise issues, though in practice few users seem to notice!

Attwood Tsunami

• Flow Rate : 500, 800 or 1200 Gallons Per Hour (GPH)
• Automatic : No
• Switching : Float Switch (Sold Separately)
• Patented Shaft Seal Prevents Leaks
• Tinned Wiring Prevents Corrosion
• High-Quality Bearings, Brushes, Alloys, And Magnets
• Replaceable Motor Core For Fast Servicing

BEST OVERALL VALUE

Attwood Marine delivers a clear winner in the Tsunami, a rugged, simple machine that’s available in 3 sizes: 500, 800, or 1200 GPH. A rugged polymer casing resists damage from the chemicals, fuel residues, and detergent residues so often present in bilge water, and there’s special attention paid to sealing shafts and wiring against water intrusion.

Attwood takes an unconventional approach to switching. The lack of an internal float switch might seem like a disadvantage, but switches are often the first part of a pump to wear out, and if the switch is internal, a worn-out switch means replacing the pump. The Tsunami allows you to choose an external float switch and replace it when necessary, and the easily replaceable motor core allows you to replace a worn motor rather than replacing the entire pump. This modular approach combines with the high quality of the components to provide a longer lifespan and allows you to keep spares for key components on hand to keep your pumps running.

• Flow Rate : 4000 Gallons Per Hour (GPH)
• Quick Release Strainer For Fast Cleaning
• Vibration-Free Design For Reduced Noise
• Ignition Protected For Use On Gasoline-Powered Vessels
• 2” Output Hose

BEST LARGE CAPACITY PUMP

Rule dominates the market for large-capacity bilge pumps, and it’s likely that many of the larger boats in your local marina are relying on the Rule 56S to keep their bilges dry. This pump packs a lot of power into a compact package and has a reputation for quality, durability, and reliability. 

Rule’s electronic sensor system relies on sending a brief pulse of power to the pump every 2.5 minutes to check for pressure on the impeller blades. Some similar systems generate complaints about pulses of noise and batteries drained by repeated pulses, but Rule has perfected its technology to a point where noise and battery drain are minimal. It’s not the cheapest pump out there, but if you own a large pleasure boat, you’re going to be more concerned with reliability and power than you are about price, and this pump delivers both!

THINGS TO CONSIDER WHEN BUYING A BILGE PUMP FOR SAILING

Before you start shopping for bilge pumps, get a sense of what you’ll need. Different boats need different pumps in different arrangements. Many sailors prefer a low-profile pump in the deepest part of the bilge backed up by a higher capacity pump mounted a bit higher, designed to provide more capacity if the primary pump can’t handle the load.

If your boat has more than one compartment below the waterline, you’ll need pumps in each one. If you’re not sure what type of pump and what capacity you need, consult your boat manufacturer’s recommendations or ask for advice from more experienced boaters . Keeping water out of your boat is too important to leave up to chance or a guess!

KNOW YOUR BILGE

The bilge is the lowest portion of a boat’s hull (bottom). It’s where any water inside your boat goes, and it needs to be pumped out regularly. Many bilges have more than one compartment. Before you look at pumps, you should inspect your bilges and know what you need to keep dry.

Remember that bilge pumps are designed to remove water that enters your boat through slow leaks or over the deck. They will not pump fast enough to compensate for major leaks or hull damage!

How much pumping power do you need? This table provides a rough estimate.

If you’re sailing in open water or rough conditions you’ll want to be at the high end of the range, and excess capacity never hurts.

Remember that pumps are tested for output with the inflow and outflow at the same level. In practice, you’re always pumping water up to a higher level, which reduces flow, especially in sailboats, which have deeper bilges than powerboats. It’s safe to assume that actual flow will be around 60% of rated flow, but if you’re planning to place a pump in a deep bilge, test it first to make sure it can lift water high enough and maintain an adequate flow rate.

HOW MANY PUMPS?

Most experts recommend that every boat over 16’ should carry a minimum of 2 bilge pumps. One is usually paced as low in the bilge as possible, with a larger capacity pump at a higher level to add power if the primary pump is unable to keep up with the water inflow.

If your boat has more than one compartment below the waterline you’ll need at least one pump, better two, for each compartment.

CLEAN BILGE, HAPPY PUMPS

Bilges naturally accumulate debris and spills, and many sailors are less than careful about keeping them clean. The bilge isn’t anyone’s favorite part of the boat, and inspection and cleaning aren’t fun. Do it anyway: debris in the bilge can clog pump intakes and spilled fuel or chemical residues from cleaning can damage pumps. If you keep your bilges clean, your pumps will last longer and will be less likely to fail when needed.

INSTALLATION

Bilge pumps operate under difficult conditions: saltwater immersion is not friendly to electrical connections! Many bilge pump failures trace back to improper installation, so if you’re not absolutely sure that you know what you’re doing, seek professional help and get it done right.

West Marine offers detailed advice on choosing a bilge pump , and Practical Sailor has a good list of installation and maintenance tips .

FEATURES EXPLAINED

Flow rates are expressed in Gallons per Minute (GPM) or Gallons per Hour (GPH). European products may cite specifications in liters per hour or minute.

As noted above, manufacturers test output with intake and outflow at the same level. You’ll always be pumping water up, so your functional output will be less than the rated output. Your electrical system can also affect output: many pumps are tested at 13.6v, and if your batteries are putting out less you’ll have a lower flow rate!

Automatic bilge pumps switch on as soon as they detect enough water to pump, and turn off when the water is reduced to levels below the detection threshold. This is usually achieved through a float valve or an electronic sensor. Some electronic sensors may require power to detect water, which can place additional demand on batteries.

Manually switched bilge pumps can either be switched on when you want to pump water or connected to an external float switch.

AIRLOCK PROTECTION

Some pumps can be “airlocked” if air enters the system. Many manufacturers use anti-airlock systems to assure that this doesn’t happen and to eliminate the need for pump priming.

BACKFLOW PROTECTION

Sailboats are designed to heel, and aggressive heeling may place bilge pump outflow ports below water level. If this happens siphon action may bring water into the boat. Installers often use an upward hose loop to reduce the chance of backflow, but some manufacturers also add backflow protection valves.

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The Top Bilge Pumps for Boats: A Comprehensive Guide

April 26, 2023 9 min read

The Top Bilge Pumps for Boats: A Comprehensive Guide 

As a boat owner, you understand the importance of keeping your vessel safe and seaworthy. One of the most critical components in achieving this is a reliable bilge pump system. Bilge pumps help remove unwanted water from the bilge area, preventing damage and ensuring the safety of those onboard. With numerous options available, it can be challenging to determine which pump is best for your needs. In this blog post, we'll discuss the top bilge pumps for boats, their features, and what makes them stand out from the competition.

Rule-Mate Automatic Bilge Pump

Rule-Mate is a leading brand in the boating industry, renowned for producing reliable and long-lasting bilge pumps. Their automatic bilge pump stands out from the competition with its innovative features, making it a top choice for boat owners. In this article, we will delve deeper into the Rule-Mate Automatic Bilge Pump's unique features, benefits, and why it is an excellent option for various boat sizes.

Built-In Electronic Water-Sensing Technology

One of the standout features of the Rule-Mate Automatic Bilge Pump is its advanced electronic water-sensing technology. This innovative system automatically activates the pump when water is detected in the bilge area, ensuring that your boat remains dry and safe. The pump will also deactivate once the water level falls below a certain threshold, preventing unnecessary wear and tear and conserving power. This smart system offers peace of mind, as it is always ready to spring into action when needed.

Three Capacity Options for Different Boat Sizes

Rule-Mate Automatic Bilge Pumps are available in three different models, each with a specific capacity to suit various boat sizes. The 500 GPH (gallons per hour) model is perfect for smaller boats, while the 750 and 1100 GPH models are designed to handle the demands of larger vessels. By offering multiple capacity options, Rule-Mate ensures that boat owners can select the perfect bilge pump for their specific needs.

Compact Design for Easy Installation

One of the most significant challenges boat owners face when installing bilge pumps is finding enough space in the bilge area. The Rule-Mate Automatic Bilge Pump addresses this issue with its compact design, allowing for easy installation in tight spaces. Its versatile design means it can be installed in a variety of orientations, making it compatible with various boat layouts.

Durable Construction and Easy Maintenance

The Rule-Mate Automatic Bilge Pump is built to last, using high-quality materials and components to ensure durability and reliability in harsh marine environments. The pump's motor is thermally protected, preventing damage from overheating, while the housing is made from rugged, impact-resistant plastic.

In addition to its robust construction, the Rule-Mate Automatic Bilge Pump is designed for easy maintenance. The pump's strainer base can be easily removed, allowing you to clean and inspect the pump without the need for any specialized tools. This ease of maintenance helps prolong the life of the pump and ensures it operates at peak efficiency.

The Rule-Mate Automatic Bilge Pump is a top choice for boat owners, thanks to its innovative electronic water-sensing technology, multiple capacity options, compact design, and durable construction. Its automatic activation and deactivation ensure that your boat remains safe and dry, while the variety of capacities available make it suitable for a wide range of vessel sizes. With its combination of advanced features and ease of installation and maintenance, the Rule-Mate Automatic Bilge Pump is an investment in the safety and longevity of your boat.

Attwood Sahara Automatic Bilge Pump

The Attwood Sahara Automatic Bilge Pump is a popular choice among boat owners for its fully integrated system, ease of installation, and low maintenance requirements. With three capacity options to choose from, this pump caters to a wide range of boat sizes. In this article, we will take a closer look at the Attwood Sahara Automatic Bilge Pump, exploring its features in detail and discussing why it is a top choice for boat owners.

Fully Integrated System for Convenience and Reliability

One of the primary advantages of the Attwood Sahara Automatic Bilge Pump is its fully integrated system, which combines the pump, float switch, and wiring into a single compact unit. This design simplifies installation, as there are fewer components to connect and secure. Additionally, the integrated design reduces the risk of failure due to component compatibility issues, ensuring a more reliable and efficient performance.

Three Capacity Options to Suit Various Boat Sizes

The Attwood Sahara Automatic Bilge Pump is available in three different capacity options: 500, 750, and 1100 GPH (gallons per hour). This variety allows boat owners to select the appropriate pump capacity based on their vessel size, ensuring optimal performance and protection. By catering to a wide range of boat sizes, the Attwood Sahara Automatic Bilge Pump is a versatile solution for many boating enthusiasts.

Easy Installation and Low Maintenance

Designed with user-friendliness in mind, the Attwood Sahara Automatic Bilge Pump is incredibly easy to install. The compact unit is simple to mount and wire, making it an ideal choice for both seasoned boaters and those new to boat maintenance. The pump's low maintenance requirements also contribute to its appeal, as it has fewer components to clean, inspect, or replace over time.

Durable Construction with Water-Cooled Motor

The Attwood Sahara Automatic Bilge Pump is built to withstand harsh marine conditions, ensuring a long service life. The pump's durable construction features a water-cooled motor, which helps dissipate heat and prolongs the motor's lifespan. This design not only enhances the pump's durability but also contributes to more efficient and reliable operation.

Anti-Airlock Protection for Consistent Performance

One common issue faced by bilge pumps is airlock, where air bubbles become trapped in the pump, preventing it from functioning correctly. The Attwood Sahara Automatic Bilge Pump addresses this problem with its anti-airlock protection feature. This design ensures that the pump remains primed and operational, even when air bubbles are present, maintaining consistent performance and keeping your bilge area dry.

The Attwood Sahara Automatic Bilge Pump stands out for its fully integrated system, ease of installation, and low maintenance requirements. With three capacity options to suit various boat sizes and a durable construction that includes a water-cooled motor and anti-airlock protection, this pump is an excellent choice for boat owners seeking a reliable and efficient bilge pump solution. Its combination of convenience, durability, and consistent performance make the Attwood Sahara Automatic Bilge Pump a top choice for maintaining a safe and seaworthy vessel.

Johnson Pump Cartridge Combo Bilge Pump

The Johnson Pump Cartridge Combo Bilge Pump is a popular option among boat owners for its innovative design, ease of maintenance, and versatile capacity options. Its unique removable cartridge system sets it apart from other bilge pumps on the market. In this article, we will delve deeper into the features and benefits of the Johnson Pump Cartridge Combo Bilge Pump, highlighting why it is an excellent choice for various boat sizes.

Unique Removable Cartridge Design for Easy Maintenance

The Johnson Pump Cartridge Combo Bilge Pump's standout feature is its removable cartridge design, which simplifies maintenance and prolongs the pump's life. The cartridge can be easily removed for cleaning or replacement without the need for tools or disconnecting any hoses, making maintenance a hassle-free process. This innovative design not only saves time and effort but also helps maintain peak performance, ensuring your bilge area stays dry and your boat remains safe.

Three Capacity Options for Versatile Performance

The Johnson Pump Cartridge Combo Bilge Pump is available in 500, 750, and 1000 GPH (gallons per hour) models, providing a versatile solution for various boat sizes. This range of capacities allows boat owners to select the appropriate pump for their vessel, ensuring optimal performance and protection. By offering a selection of capacities, the Johnson Pump Cartridge Combo Bilge Pump caters to the needs of a wide range of boaters.

Built-In Check Valve to Prevent Backflow

One potential issue with bilge pumps is backflow, which can cause water to flow back into the bilge area when the pump is turned off. The Johnson Pump Cartridge Combo Bilge Pump addresses this concern by including a built-in check valve that prevents backflow, ensuring consistent performance and maintaining a dry bilge area. This feature enhances the pump's reliability and contributes to the overall safety of your boat.

Durable Construction for Longevity and Reliability

The Johnson Pump Cartridge Combo Bilge Pump is built with high-quality materials and components, ensuring it can withstand the harsh marine environment. Its durable construction guarantees a long service life and reliable performance, providing boat owners with peace of mind. The pump's robust design also contributes to its overall efficiency, ensuring it can handle the demands of regular use without faltering.

Easy Installation for User Convenience

The Johnson Pump Cartridge Combo Bilge Pump is designed for easy installation, making it an appealing choice for both experienced boaters and those new to boat maintenance. Its compact design and straightforward mounting process ensure that the pump can be quickly and securely installed in your boat's bilge area. The simplicity of installation, combined with the pump's unique removable cartridge design, makes it an ideal choice for those looking for a user-friendly bilge pump solution.

The Johnson Pump Cartridge Combo Bilge Pump stands out for its innovative removable cartridge design, ease of maintenance, and versatile capacity options. Its built-in check valve and durable construction ensure reliable and consistent performance, making it an excellent choice for various boat sizes. With its combination of user-friendly features and efficient operation, the Johnson Pump Cartridge Combo Bilge Pump is a top choice for boat owners seeking a reliable and convenient bilge pump solution.

Whale Supersub Smart Electric Bilge Pump

For boat owners with limited space in their bilge area, finding a suitable bilge pump can be a challenge. The Whale Supersub Smart Automatic Bilge Pump offers a practical solution with its low-profile design and intelligent control system, making it an excellent choice for small to medium-sized boats. In this article, we will take an in-depth look at the features and benefits of the Whale Supersub Smart Automatic Bilge Pump and why it is an ideal choice for boat owners with limited bilge space.

Low-Profile Design for Flexible Installation

One of the main attractions of the Whale Supersub Smart Automatic Bilge Pump is its low-profile design, which allows for installation in tight spaces where traditional bilge pumps may not fit. The pump's slim design enables both horizontal and vertical installation, providing boat owners with flexibility in choosing the best configuration for their specific needs. This adaptability ensures that even boats with limited bilge space can benefit from the Whale Supersub Smart Automatic Bilge Pump's efficient performance.

Built-In Intelligent Control System for Optimal Performance

The Whale Supersub Smart Automatic Bilge Pump features a built-in intelligent control system that sets it apart from other bilge pumps. This advanced system detects water levels in the bilge area and activates the pump accordingly. Furthermore, the system adjusts the pumping speed based on the water level, ensuring optimal performance and energy efficiency. This smart control system not only guarantees consistent and reliable performance but also extends the pump's lifespan by preventing unnecessary wear and tear.

650 GPH Capacity for Small to Medium-Sized Boats

With a capacity of 650 GPH (gallons per hour), the Whale Supersub Smart Automatic Bilge Pump is suitable for small to medium-sized boats. This capacity ensures that the pump can effectively handle the demands of various boat sizes, providing reliable protection against water accumulation in the bilge area. By catering to a range of boat sizes, the Whale Supersub Smart Automatic Bilge Pump offers a versatile solution for boat owners seeking an efficient and reliable bilge pump.

Durable Construction for Longevity

The Whale Supersub Smart Automatic Bilge Pump is built to withstand the harsh marine environment, ensuring a long service life. Its durable construction features high-quality materials and components that resist corrosion and wear, guaranteeing reliable performance even in challenging conditions. The pump's robust design ensures that it can handle the rigors of regular use without compromising efficiency or reliability.

Easy Installation and Maintenance

The Whale Supersub Smart Automatic Bilge Pump is designed for easy installation, making it a user-friendly choice for boat owners of all experience levels. Its low-profile design and flexible mounting options ensure that the pump can be quickly and securely installed in your boat's bilge area. Additionally, the pump's intelligent control system simplifies maintenance by reducing the risk of unnecessary wear and tear, ensuring that your pump remains in optimal condition for longer.

The Whale Supersub Smart Automatic Bilge Pump is an ideal choice for boat owners with limited bilge space, offering a low-profile design, flexible installation options, and a built-in intelligent control system. Its 650 GPH capacity makes it suitable for small to medium-sized boats, while its durable construction ensures long-lasting performance. With its combination of efficient operation, adaptability, and easy installation and maintenance, the Whale Supersub Smart Automatic Bilge Pump is a top choice for boat owners seeking a reliable and space-saving bilge pump solution.

A reliable bilge pump system is crucial for maintaining a safe and functional boat. When choosing the best bilge pump for your needs, consider factors such as the size of your boat, available space for installation, and the pump's capacity. The Rule-Mate Automatic Bilge Pump, Attwood Sahara Automatic Bilge Pump, Johnson Pump Cartridge Combo Bilge Pump, and Whale Supersub Smart Automatic Bilge Pump all offer reliable performance and unique features that make them top choices for boat owners. Don't forget to have a manual backup pump on hand for emergencies, and always perform regular maintenance to ensure your bilge pump system operates effectively. 

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Installing the Ultimate Bilge-Pump System

• By Kevin Falvey
• Updated: April 14, 2014

A bilge pump’s massive flow rate is often touted as proof of excellence.

Pump capacity isn’t the only metric used to judge a bilge-pump system, though. For instance, smoothbore hose costs more but makes better use of pump power than corrugated hose. And the redundant safety provided by multiple pumps is hard to beat.

This project outlines the installation of a second bilge pump that’s “high and dry” until called into service. While you might choose different components, this project outlines principles I believe should be part of any “ultimate bilge-pump system.”

Getting Started Skill Level: 3/5 Time to Complete: 4 hours

Tools and Supplies *Nonautomatic bilge pump: Johnson 1600 ($85, westmarine.com ) *Automatic float switch: Rule Super Switch ($58, westmarine.com ) *Reinforced polyester tubing (“clear vinyl hose”): Shields Series 162 ($3.14/foot, westmarine.com ) *Three-way switch for helm control of pump *Stainless-steel hose clamps (check with magnet) *Through-hull fitting with 90-degree elbow *Tie wraps *Nut drivers, screwdrivers, drill, pliers, cutters and wrenches to suit

1. Mount the Pump Install the backup pump above the primary pump but below the level of the cabin sole, batteries and other critical equipment. You may need to build or buy a shelf or bulkhead-mount bracket.

2. Install the Switches Install the automatic switch in a fore-and-aft orientation and with its hinge forward. Doing so ensures that the switch does not cycle as a result of a pitching boat or water running aft. Install a dedicated control switch at the helm. (Bilge pumps are the only appliance that may be wired directly, or “hot-wired,” to the batteries, according to the American Boat and Yacht Council.)

3. Plumbing Plumb hose from the pump to a point at least 12 inches above the waterline and back down to the discharge fitting, which should itself be above the waterline. Avoid kinks, bends and sags. This “riser loop” prevents siphoning. Using a 90-degree hull fitting precludes a sharp bend in the hose.

4. Safe Support Support the hose run with tie wraps, epoxy-gluing plywood to the hull side for the purpose if required. Secure the hose to fittings with clamps. Make electrical connections using best practices for waterproofing, fusing and mechanical integrity.

Quick Tip: The riser loop allows the discharge to exit lower on the hull side, reducing mess and noise from splashing bilge water.

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Practical Boat Owner

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Best bilge pumps: electric pumps, emergency pumps and alarms

• Rupert Holmes
• February 2, 2021

Rupert Holmes explains how electric bilge pumps work and why performance doesn't always meet expectations

We all know that effective bilge pumping arrangements are essential for safety at sea, yet a surprising number of boats are lacking in this respect.

Automatic electric pumps often sound like the ideal solution, but many installations fail to live up to expectations. One of the reasons is that real-life installations are often much less powerful than the pump’s specifications on paper might suggest.

Buy a bilge pump

• 500 GPH Pump, Rule-A-Matic Float Switch
• SAILFLO Bilge Pump Automatic 12v 
• Osculati Rule Mate automatic bilge pump 55l/min 12 V
• Shurflo 700 bilge pump – 12 VDC, 700 GPH

Buy a high capacity bilge pump

• Jabsco 31705-0094 Marine ParMax 4 bilge pump
• Whale: Gulper 320 high capacity waste/ bilge pump 12V

Note: We may earn a commission when you buy through links on our site, at no extra cost to you. This doesn’t affect our editorial independence.

A key issue here is that rated performance is often given at the pump outlet, not where the water exits the hull of the boat. If bilge water has to be lifted 3ft to get it out of the boat the flow rate will be reduced by 30%.

Equally friction in the pipework – especially where reinforced corrugated pipe is used – can account for a further 20-30% reduction. In addition, flow rates are often quoted for 13.5V of power reaching the pump, but that’s only likely to happen with the engine running. If the service batteries are half-discharged at around 12.2V there will be a further reduction in flow.

When these three factors are added together it’s not unusual to see real-life pump outputs of only 40% of the rated figure, even for good installations.

If there are long pipe runs with lots of elbows, or undersized/corroded wiring to the pump, output may not even reach 25% of the rated flow. And if the pump rating is for US (rather than imperial) gallons then flow rates will be even lower than owners on this side of the Atlantic might expect.

A second problem with standard leisure automatic pumps is that there’s no warning until something has gone badly wrong. In times gone by we would count the number of strokes needed to empty the bilge with a manual pump at the change of each watch. Any developing problem would therefore come to light at an early stage.

However, if an electric pump deals with small ingresses of water without fuss you don’t have advance notice of a developing problem until the pump can no longer keep up with the ingress, or the vessel’s batteries run flat. By contrast, many commercial fishing vessels have been saved thanks to their mandatory bilge alarms.

Bilge water alarms

In many yachts it’s a straightforward enough job to fit an alarm. An existing set-up could be adapted, for instance, by wiring a low-cost buzzer to the float switch so that the alarm sounds when the pump operates. However, a separate alarm system is a better option, as this will function even if the pump’s float switch fails.

There are also cost-effective options for sensors, starting at £120, that will automatically ping a message to your mobile phone or email when the alarm is activated. Examples of remote monitoring sensors include Blueguard , Chargemetrix and  Yacht Sentinel.

Buy a bilge alarm

• Rule 33ALA Marine High Water Bilge Alarm (Mercury Free, 12-Volt)
• Wi-Fi water Level/sump monitor Sensor with buzzer, email/text Alerts

Some more handy articles on bilges

We looked at eight options for cleaning bilges, from dedicated products to household cleaners

• What’s the best bilge cleaner for your boat? See PBO’s test of best bilge cleaners
• How to make your own bilge water alarm
• Bilge sensor clogging up with gunk?

Emergency pumps

It’s also important to remember that bilge pumps are only really intended as a convenience for emptying incidental water ingress, not for emergency situations. That’s why World Sailing has introduced a requirement for longer offshore races, plus cruising events such as the ARC, to carry a high-capacity emergency pump.

This needs to have a minimum rated capacity of 200lt per minute (ie 3,160 US or 2,650 imperial gallons per hour) and can be either portable or permanently installed. Products such as Rule’s 3700 and  Rule’s 4000 models , and the largest of Whale’s Orca 3000 satisfy this requirement. Prices typically start from around £165.

For more advice on buying a bilge pump, ASAP Supplies is very helpful.

Enjoyed reading Best bilge pumps: electric pumps, emergency pumps and alarms?

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The 6 Best Bilge Pumps of 2024

This post may contain affiliate links. Please read our  disclosure policy .

Bilge pumps are a necessity on a boat to remove excess water, but they can definitely be on the fickle side (five-gallon buckets are jokingly recommended instead), there are some better options out there.

The best bilge pumps have a varying degree of efficiency and performance along with differing features for vessels like bilge pumps for large boats, dinghies, kayaks, and center consoles.

Despite being an overlooked part of a boat, bilge pumps are a crucial device that keeps your craft “high and dry.” This means that it’s important to have a high-quality model, regardless of whether your vessel is en route or stored on land (rainwater can turn a dormant boat into a molding bathtub). And, no matter what bilge pump brand you go with, it’s imperative that the device is properly installed and maintained. Below, we’ve reviewed some of the best bilge pumps on the market. We weighed the pros, cons, and functionality of each option to create our list. Read on to learn about all of the must-know basics, along with some key tips regarding pump switches and the installation process.

Our Top Picks

• Best Overall Bilge Pump : Rule Mate Fully Automated Bilge Pump – $115.06 at Amazon
• Best for Fishing Boats : Rule LoPro Series Bilge Pump – $79.99 on Amazon
• Best Battery Operated Bilge Pump: Attwood WaterBuster Portable Pump – $47.95 at Amazon
• Best Kayak Bilge Pump : SeaSense Self Priming Hand Pump – From $24.63 at Amazon
• Best For Large Boats : Rule DB412 Dry Bilge Pump Panel – $235.88 at Amazon
• Best Deep Draft Float Switch : USS Bilge Pump Switch – $229.99 at Amazon

Reviews of The Best Bilge Pumps

1. best overall bilge pump: rule mate fully automated bilge pump.

If you’re just looking for a reasonably-priced bilge pump for general use — like in a sailboat or another bilge pump — this water-sensing pump is a solid choice. The pump has a built-in float switch that will automatically sense when the water needs to be removed. 

As long as these pumps are installed correctly and the bilge isn’t soaked in diesel, oil, or battery acid (this is more common than you think), Rule pumps are robust and manufactured for consistent reliability. The Rule pumps come in three different sizes: 500, 800, or 1100 GPH.

Tip: When deciding what size is best for your boat , remember that many outside factors can impact that advertised efficiency, so it’s best to overestimate (and even better, run more than one pump). For example, on a 30-foot sailboat, you’ll want to go with a pump that can handle at least 1,000 GPM. 

• Type : Centrifugal 
• Float Switch : Automatic (built-in)
• Pump Rate : 18.33 GPM (for the 1100 model)
• Dimensions : 6.75″L x 8.5″W x 3.5″H
• Water Lift: Not specified
• Features: Backflow prevention, debris sensor, built-in thermal cut-off 
• Easy installation
• Reasonably priced
• Good-quality automatic pump
• Can clog more easily than some
• Basic design 

What Others Are Saying:

This bilge pump has a solid 4.5-star rating from more than 300 Amazon buyers.

Buy the Rule Mate Fully Automated Bilge Pump:

2. Best for Fishing Boats: Rule Mate Fully Automated Bilge Pump

Although the pump rate is slightly lower than our top choice, Rule’s LoPro series bilge pump has a low-profile design that offers flexible mounting options that can be positioned in slanted spaces. It is particularly perfect for center consoles where space is limited, such as beneath tanks, bait wells, and other inaccessible locations. 

Like our top choice, the pump has an automatic float switch built in, but this pump’s design includes a unique, 180-degree swiveling discharge tube for easy positioning. It also has an internal (but removable) check valve to prevent water backflow, and an automatic shut-off center to prevent the pump from constantly running when there isn’t any water present. 

• Type : Diaphragm
• Float Switch : Automatic (built-in) (a manual option is also available)
• Pump Rate : 15 GPM
• Dimensions : 12″L x 9″W x 4″H
• Features: Low profile design, 180-degree swivel for discharge
• Low profile design
• Affordable price
• Works great in limited vertical spaces
• Not ideal for large vessels
• Prone to clogging due to small base footprint

This affordable bilge pump has a 4.3-star Amazon rating from more than 400 shoppers.

Buy the Rule LoPro Series Bilge Pump:

3. Best Best Battery Operated Bilge Pump: Attwood WaterBuster Portable Pump, Submersible

Technically, all bilge pumps are battery-operated since they run off 12-volt batteries. However, some bilge pumps, like this pick from Attwood, can run on D-cell batteries, making them a portable option. These types of pumps come in handy when pumping dinghies, kayaks, or inflatables, especially after heavy rain storms. They’re not permanently installed, so you can use them for multiple vessels (or loan to a friend in need). 

While there aren’t many on the market, this submersible battery-operated pump is a medium-duty pump that can lift water up to 40 inches. Because of this, it’s one of the best options out there — just make sure that you know how to open the battery compartment (it can be tricky) and that you take good care of it since it won’t last long term when frequently exposed to the elements. In other words, don’t leave it in sitting the dinghy!

Pro Tips : Remove the batteries after each use to prevent corrosion and ensure the longevity of the device. You may also want to consider getting rechargeable batteries. 

• Type : Portable (battery-operated)
• Float Switch : Not included
• Pump Rate : Up to 3.33 GPM
• Dimensions : 5.25″L x 5.25″W x 6.5″H
• Water Lift: Up to 40 inches
• Doesn’t require electricity
• Can be used anywhere
• Good for dinghies, kayaks, and inflatables
• Shorter battery life 
• Not meant for long-term use
• Users say the battery compartment needs improvement

Buy the Attwood WaterBuster Portable Pump:

4. Best Kayak Bilge Pump: SeaSense Self Priming Hand Pump

Every boat should also carry the SeaSense self-priming hand pump to pump out dinghies, lazarette lockers, freezers, and just about any flooded chamber. These are not an alternative to having a traditional bilge pump, but rather a supplemental pump that’s extremely useful to have onboard. 

They’re especially great for kayaks and canoes, whether they were left upright in the rain, or if the canoe accidentally tips when you’re rowing, These manual pumps can come to the rescue. Plus, with no wires or batteries, you can leave them inside the kayak or canoe so you’ll always have it in time of need. Combine this pump with a giant sponge , and you’ll be back on your adventure in no time. 

• Type : Portable (Manual)
• Float Switch : N/A
• Pump Rate : Varies
• Dimensions : 3.5″L x 4.5″W x 20.75″H
• Features : Self-priming, removable hose
• Low maintenance
• No wires or batteries

The Cons: 

• Not for permanent use 
• Requires manual effort

This bilge pump has a 4.5-star rating from over 1,000 Amazon reviewers. 

Buy the SeaSense Self Priming Hand Pump:

5. Best for Large Boats: Rule DB412 Dry Bilge Pump with Panel Switch

If you have a larger vessel like a trawler or sailboat with additional machinery space, you may want to consider the electric diaphragm pump like this Self Priming Dry Bilge Pump. It can be installed almost anywhere, which means it’s one of the more accessible options on our list. 

These self-priming pumps are significantly more costly than your average run-of-the-mill bilge pump, but they have a low-profile design, along with the distinct advantage of flexible mounting solutions, like under the galley sink. With a rotatable inlet and outlet hose manifold, this pump can run dry without damage and effectively remove most of any bilge’s water through its sealed vacuum chamber. It can also lift water up to 9.5 feet.

Pro Tip : Be sure to securely install a screen at the bottom of the hose where it rests in the bilge, such as the Whale Pump Plastic Bilge Strainer . If possible, you’ll also want to screw this screen on a small, synthetic block (so it won’t rot) to allow space between the floor so that debris can pass under it. 

Although we recommend this Rule electric diaphragm pump as the best in its price class, if you’re willing to spend twice as much, we also want to note that the Jacbsco Medium and Heavy Duty Diaphragm Pump will last a lifetime as parts are readily available. 

• Type: Diaphragm 
• Pump Rate: Up to 4GPM
• Water Lift : 9.5 feet
• Dimensions :‎13.8 x 7.2 x 5.8 inches
• Features : Dry run, rotatable inlet
• Can be installed anywhere
• Minimal maintenance required
• Requires a hose and screen (sold separately)
• Expensive 

Buy the Rule DB412 Dry Bilge Pump:

6. Best Deep Draft Float Switch: USS Bilge Pump Switch

An external pump switch senses the water levels of the bilge and can then work in conjunction with a pump to automatically turn it on or off. ( Note that on their own, they won’t actually pump any water .) If you have a very deep, narrow bilge, (like on a deep draft sailboat) where traditional floats are difficult to service, this cylindrical switch from Ultra Safety Systems is an excellent choice — you’ll just need to purchase the pump separately. 

This pump switch can be clamped to a rod or long pole and plunged down into inaccessible areas, plus a power indicator light on the top so you can easily see if it’s working in a deeper space. Although it is more expensive than some of the other options, it’s made with stainless steel, which may last longer than plastic picks. 

• Type : Cylindrical
• Float Switch : External 
• Pump Rate : N/A
• Dimensions : 6.25 x 2.5 x 6.25 inches
• Water Lift: Rated up to 15 feet (but depends on the pump)
• Features : Power indicator light, side clamp 
• Flexible mounting options
• 5-year warranty
• Great for deeper bilges 
• Extremely durable
• Not good for shallow bilges 
• Pump not included 

Buy the USS Bilge Pump Switch:

Other Bilge Pumps (and Float Switches) We Considered 

Champion gas-powered semi-trash water transfer pump .

Although it’s not a bilge pump, this is a great water removal system to have in an emergency situation – like when your boat is, in fact, sinking. For example, if a through-hole fitting fails or you need to rescue another sinking boat, these are a lifesaver. It can crank out an insane 158 gallons of water per minute and run for 7.5 hours. That said, it’s massive and isn’t something you’d use for day-to-day water removal.  The Champion Gas-Powered Semi Trash Water Transfer Pump is available at Home Depot for $428.89 .

Amazon Universal Pump

This lever-action, self-priming hand pump that pumps 22 GPM gets the job done. With its removable handle, it can be mounted in various locations like the cockpit, vertically or horizontally, and has a large 1 ½ inlet and outlet to evacuate serious volumes of water or other liquids (such as blackwater). No small sailboat is complete without a manual self-priming pump, but they’re just not designed for continual use. The Amazon Universal Pump from Jabsco is available at Amazon for $115.38.

Water Witch Bilge Pump Switch 217

As far as bilge pump switches go, Water Witch makes diminutive static switches with different amp ratings, delayed on/off cycles, and both 12 and 24 voltage options (depending on the model number). These submersible switches are a standout because they do not have moving parts, can tolerate dirtier bilges, and remains on for a short time after the water is gone to purge the hose. That said, they fly a little under the radar (pun intended), so online reviews are limited. However, they do include a 7 year limited warranty. The Water Witch Bilge Pump Switch 217 is available at Defender for $62.99 .

Jabsco Medium and Heavy Duty Diaphragm Pump 

Among the diaphragm pumps, Jabsco’s 330 GPH Bilge Pump has a convenient design and above-the-bilge installation for easy service access. It combines both inlet and outlet ports, an in-line strainer, and vibration-dampening feet for smooth operation. They’re definitely an investment but are practically indestructible (when maintained properly). The Jabsco Medium and Heavy Duty Diaphram Pump is available from $389.98 at West Marine . 

Why You Can Trust Us

I’m Clay Mills, a marine photographer , liveaboard boater, and shipwright based in Key West, Florida. For the past few years, I’ve also been a sailing instructor for SeaBase (the Boy Scouts of America), but I’ve spent my entire life and career around boats and have navigated many different waterways through the United States and the Caribbean. 

I first moved on a 40-foot wooden sailing sloop in 1972 with my father in Oxnard, California, before I landed a job at a busy boatyard in Anacortes, Wash. After serving in the military, I went to a boatbuilding school and then later built Gold Coast sailing catamarans in St. Croix, USVI. I headed back to California to manage a sailing fleet and then began taking boat deliveries along the Pacific Coast. In 2021, I arrived in Key West after rebuilding an Albin Ballad and sailing it down from Hilton Head, South Carolina.

You can read more about Clay Mills here .

Needless to say, I’ve installed my fair share of bilge pumps! When writing this article, I leveraged my personal experience and guidance from fellow boaters, along with research from trusted marine publications. When choosing the product selections, I focused on the durability of the product, how well it functioned overall, and what type of installation or vessel it was the best fit for. Just remember, no matter what bilge pump you select, it will require regular maintenance to prevent clogging or damage.

What to Know About Bilge Pumps

Things to Consider When Choosing a Bilge Pump

We can’t emphasize enough that proper installation and maintenance is absolutely crucial. That said, in addition to the size, design, and flow rate (measured in gallons per minute, or GPM), there are other things to keep in mind. 

Automatic or manual

We recommended a few bilge pump options that only operate manually, which are typically ideal for kayaks and small dinghies. 

However, a standard vessel’s main bilge pump can be configured to operate either manually (flip a switch, on/off) or automatically (activated by water level and electro-mechanical interaction). The manual setting is primarily used for verifying that the pump is working by allowing the operator to activate and inspect its function as fluid is being removed. 

The automatic setting allows the pump, via a mechanical float switch or water level sensors, to remove most of the fluid from the vessel before deactivating its circuit/turning off the pump when done.  

Tip: Poorly placed pump systems often “cycle” on and off as fluid backflows into the bilge. To prevent this, mount the external float switch or water sensors slightly higher than the pump base.  

Type of Float Switch

Float switches are devices that move up and down as the level of liquid changes and send a signal to the bilge pump to remove water when needed. These are imperative for bilge pumps to function, and come in two different types: internal and external. 

• Internal Float Switches: These are either mechanical or electromagnetic and are a built-in part of the bilge pump, offering the added convenience of one-device installation. However, if the float switches fail, so does the entire pump. If this happens, it’s often due to the wiring caused by improper installation. 
• External Float Switches:  Separate devices that detect the level of water in the bilge and send a signal when to turn the pump on. Some of the most common types of external float switches include cylindrical, fulcrum arm style, disk style, and water-sensing float switches.
• Cylindrical: These are self-contained tubes where a donut-shaped ring rises to electromagnetically activate the circuit. An example of this is the USS Bilge Pump that we recommended earlier , which is great for deep draft bilges.
• Fulcrum Arm Style: Separate mechanical fulcrum arm float switches allow for more flexible pump placement in elevation and location, and can be both covered and uncovered. Covered ones are housed within a box (that resembles a butter tray) with slots to allow water in and out as a floating fulcrum arm turns the pump on/off ( like this one from Rule ). The cover adds protection from hoses, wires, and whatever else might impede their rise and fall. Uncovered fulcrum arm float switches perform the same task but are more susceptible to bilge debris and hose or cable restrictions. 
• Disk Style : These are a unique design that contains two small disks that monitor levels. The Water Witch is perhaps the best example of this. 
• Water Sensing Float Switches : Water sensing switches like the Whale Electric Field Sensor Switch can be mounted in more restrictive locations where access is limited, like deep and narrow sailboat bilges.

Bilge Pump Fuses

When purchasing a bilge pump, you’ll also want to make sure you buy an appropriate fuse. These are an integral part of bilge pump electrical systems that are placed within the power circuit to protect critical components from unattended current paths (a short circuit). They are designed to ‘burn out’ when heated beyond their rated resistance. Without a fuse in place, the circuit’s issue is soon transferred to the bilge pump where misaligned heat causes the motor to ‘burn out’. I’ve seen unfused bilge pumps with holes melted into their sides from adverse heat that would normally have just burnt out the fuse. 

Bilge pump fuses are rated in amps and should also be sized with the correct wiring gauge.I always wire at least one bilge pump, my primary one, directly to my best battery creating a non-destructive path to it; so no matter what happens to the rest of the vessel’s electric grid the pump remains functional. I’ve seen new bilge pump systems in sinking boats simply because switches, toggles, breakers, etc. were improperly set.

Bilge Pump Basics

What is a bilge pump and what does it do.

A bilge pump is anything that removes water from the lower recesses (the bilge) of a boat. These pumps are also used to circulate water in a live bait tank, drain shower and sink sumps, relocate fluid from tank to tank, and even cycle fluids in a service loop like flushing an air conditioning unit or an engine coolant system. 

Bilge pumps operate by creating a pressure difference from one location to another in a sealed system. When a fluid is introduced within this system it flows along the pressure path, being channeled to wherever is desired.   

There a several types, including basic manual pumps which often use a lever handle to remove water, as well as electric-powered pumps, like a centrifugal pump and electric diaphragm pumps. 

Electric Diaphram pumps combine a low profile design and a built-in check valve for flexible mounting solutions like under the galley sink. These pumps can run dry without damage. Centrifugal bilge pumps must be submerged in water for function, so they need to be located at or very near the bottom of the bilge. 

Should I Leave A Bilge Pump On?

A bilge pump should normally be left in the auto setting so a float switch can activate it, remove the bilge water, and then deactivate when the water is removed. This will ultimately save wear on the motor and conserve power. 

When performing a service like changing out a pump or clearing the filter, be sure to turn off the switch to prevent shorts or unintentional activation. You should also do this when clearing out fuel leaks or other fluids from the bilge to prevent accidental discharge. 

Where is the Bilge Pump Located on a Boat?

The bilge pump is located within the lower recesses of the boat, often hidden away in an area that may be difficult to access. Pump location is dictated by boat design, and more than one pump is usually recommended for a backup.  

Bilge Pump Wiring, Installation, & Testing

How to wire a bilge pump.

• To wire a bilge pump, start by reading the instructions regarding fuse amperage and wire gauge. A fuse should be added to the positive wire and be accessible for inspection and replacement located well above the bilge water. All wiring connections should be sealed with no chance of dropping into the bilge water. 
• Sealed butt connectors are formed after proper wire crimps by heat-shrinking them around the wire. Use a heat gun set on low or a small butane lighter torch, and be careful not to overheat them and damage the wires’ protective core. 
•  Follow the same steps when connecting external float switch wires by sealing connections and keeping them out of the water. I like to use zip ties with screw eyes fastened where necessary with ½” stainless screws. 
• Pumps with built-in activation switches like Rule Industries Rule-Mate Automatic Series often have three wires:

a. Solid brown goes directly to the battery’s positive terminal with a fuse somewhere along the wire.

b. Brown with white is for manual activation to a positively wired toggle switch somewhere like the boat’s main control panel. 

 c. Black goes to your best battery ground (when in doubt go straight to the battery terminal).

Two-wire bilge pumps without built-in activation switches can use an external float arm or water-sensing switch for automatic activation, or be toggled with a manual switch. From the pump, the black wire still goes to your best (often most direct) ground.

The solid brown or red connects to a three-way toggle switch’s manual terminal and shares one of the float/sensing wires. 

The automatic switch terminal connects to the remaining float/sensing wire.

The last (middle) terminal of the three-way switch goes to the positive battery and should be fused with the required amperage required by the pump. Specific wiring diagrams should be consulted for each specific pump and float switch installation. 

How to Install a Bilge Pump 

Before you begin:

Installing a bilge pump starts with accessing the needs of the vessel. At least two pumps are recommended, increasing to four (or more) for vessels over 50 feet. The volume of water removed by each pump is rated in gallons per hour (GPH), typically rated between 350 and 3700. 

Installation Steps:

• Pumps should be firmly mounted to the bottom of the bilge (where possible), but still have enough room for removal and a fair run of the hose as it snakes its way out. Pumps usually have clipped-on mounts at their base that are fasted to the bilge’s sole with stainless steel screws. Pre-align the pump position with the hose and base connected, tightening hose clamps so they can be later accessed, and then place everything in a serviceable location. Imagine the unit being permanently screwed down with the need to unclip it for service, then mark the location.  
• Be sure to securely install a screen at the bottom of the hose where it rests on a block to allow debris to pass.
• Next, remove the base mount and tie the pump or hose aside. Reposition, then mark to drill for screws. Pre-drill the screw’s shaft diameter, vacuum out the shavings, then add a bit of siliconized caulk to the underside/holes, align, and fasten. 

When accessibility is an issue, pumps can also be mounted to removable plates. Fasten the pump, float switch, and hose run to a section of non-reactive and rot-resistant material board then slip the assembly in or beneath the area. This often works beneath engine sumps, soles, and next to masts, tables, heads, and tanks. 

Once it’s installed, you’ll need to regularly clean your bilge to ensure the pump functions properly. 

How to Test a Bilge Pump

Testing a bilge pump’s function differs with the installation, float switch, and type. It’s good practice to first visually inspect the bilge to see what may be pumped overboard if the pump is activated. A bilge full of diesel from a fuel leak does not want the pump activated and may be intentionally disabled. Similarly, a bilge full of debris mixed with water should first be cleared before testing the pump. 

To test a bilge pump, you should:

• Lift the float switch arm and activate the pump. With a dry bilge, listen for a clean motor sound, and if a rapid clicking noise is heard this often indicates something lodged within its impellers, necessitating inspection and cleaning. 
• If all sounds good, the next step is filling the bilge with water with the pump deactivated, reactivating it, and following the pump hose path as it travels to a thru-hull. Check for internal leaks, then go topside and see how much water is being discharged. 
• If there’s no indication of an internal leak but the flow is little more than a trickle this could indicate a clogged or incorrectly sized hose, a clogged check valve, a ground fault, low voltage, and/or a damaged or incorrectly sized pump. 

To test a float switch:

For the water-sensing switch, place a wet rag over its two exposed disks and wait a few seconds while a low current flows between them to activate the primary solenoid switch and bilge pump.  

Switches like the Rule a Matic Plus float switch are housed in a protective square chamber, so you’ll need to depress a small exposed lever arm along one end of the housing, to lift the main float switch within. Rules Rule Mate Automatic Bilge Pump has a “touch hear” button that activates its function, but submerging the pump is recommended.

How Often Should You Replace a Bilge Pump?

Although bilge pumps don’t have a predetermined lifespan, it is a good practice to replace them (and their associated float switches) every three years under ideal circumstances. This means a properly installed pump that was regularly cleaned, not left running for long periods, provided with the proper electrical voltage, not overheated, and not freestanding in bilge water mixed with other chemicals like diesel, oil, and acids.

Pumps may last much longer when not being used or freestanding in water, so knowing each pump’s age and use history helps determine longevity. Bilge pumps also don’t like to run below their recommended voltage and draw more current attempting to compensate for the lack thereof.

Lastly, when replacing a bilge pump always change out its associated hose clamps, screws, and hoses if they become brittle or kinked. 

Related Posts

• Sailboats & Bilge Pumps: 8 Answers (For Beginners)
• Water in the Bilge? 8 Helpful Answers
• The 6 Best Marine Solar Panels

Prices were accurate at the time of publication.

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Install The Best Bilge Pump

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Installing an automatic bilge pump may be a simple task, but it's also extremely important — this pump will keep your boat afloat, so make sure it goes in right!

Surprising but true: Most of us depend on rather cheap little pumps to keep our rather expensive boats from slipping beneath the waves. Fortunately, today's automatic bilge pumps are far more powerful and dependable than those of yesteryear. But they still go bad from time to time, and whether yours are in need of replacement or you simply want to add an extra pump or two for a security boost, you need to make absolutely sure this job goes right. Ready to get started? Good — roll up your sleeves, and let's get to work.

Before You Begin

One of the main reasons bilge pumps fail is because foreign objects either jam the pump, or lock the float switch into the "on" or "off" position. Bilge gunk, leaves, oily crud, and sand are guaranteed pump-killers, so before you even begin mounting a new bilge pump, provide it with a clean place to live. It's easiest to do this when the boat is blocked up on dry land, when you can thoroughly wash and rinse the bilge and allow the mounting area to dry. Choose a spot as close as possible to the bottom of the V in your hull and as far aft as practical, which has a secure mounting location like a shelf or a block laminated into the hull, for just this purpose.

Technical Support

Degree Of Difficulty: Moderate to expert

• Heat source (for heat-shrink tubing)
• Knife or box-cutter
• Power drill and bit (sized to match the through-hull's diameter)
• Screwdriver
• Wire crimper/stripper
• 3M 5200 Adhesive-sealant $15
• Adhesive-lined heat-shrink tubing $5
• Bilge pump w/auto switch $65–$220
• Butt connectors $3
• SS cushioned-clamps $12–$30/ea.
• Hose $2 - $5 per foot
• Stainless-steel hose-clamps $5
• Through-hull discharge fitting $7 –$28
• Tinned-copper wire (gauge to manufacturer spec., length TBD,) $20 (approx.)

Approximate Project Cost: $225

Approximate Yard Time/Cost: This job may require wiring and working in constrained areas inside the boat, as well as working outside the boat. Therefore, it can be either very simple or quite time-consuming. Depending on the nature of your boat it should take anywhere from three to 10 hours to complete the job. At an average general yard work rate of $75/per hour, the price of labor for this job could range from $225 to $750.

Step I: Mount The Strainer Basket

We're going to assume you're starting from scratch, with a new strainer and pump. (When replacing a pump, you may be able to re-use a previously-mounted strainer basket if it's in good shape and you match the brand). Many modern pumps have integrated automatic switches; in these cases you won't have to mount a separate float switch, but some boaters prefer the easy access a separate switch provides.

Start by removing the strainer basket, which does double-duty as the pump's mount, from the bottom of the pump. Place it onto the spot you'll be mounting the pump, and use a pen to mark the location of the screw holes. Then remove the basket, and drill shallow pilot holes where you made the marks. Wipe away any gel coat or wood chips, and give each hole a copious serving of 3M 5200 Adhesive/sealant to be sure water doesn't intrude into the screw holes and cause damage over time. Place the strainer basket in position over the holes. Screw it down using the stainless-steel screws that came with the pump. If you're also mounting a separate flapper-style float switch be sure to orient it athwart ship, so surging water doesn't slam it into the up position when you accelerate — a common way they become stuck.

Now go home, and take the rest of the day off. The 5200 will take 24 hours to stiffen up (and several days more to completely cure) and you don't want to knock the strainer askew or stress it before the sticky goop dries, or you might end up with imperfect seals.

DIY Bilge Pump Installation - Getting Automatic Bilge Pump Operation

Step II: Run The Wires

With the pump clipped into the basket (to ensure you make the correct length wires) run a wire from the end of the pump's ground wire to the battery. Use a crimped butt-connector with adhesive-lined heat-shrink tubing to connect these wires; remember, this connection will have to live in the moist and dank environment of your bilge, so make sure it's a good one. Run the wire along a bulkhead or a pre-existing wiring harness, and secure it every couple of feet with cushioned clamps. Note: always use the manufacturer's recommended minimum (or larger) gauge tinned-copper wire.

Next, run a pair of wires (one for the "on," one for the "auto" setting) to a three-way switch, located at the helm. It's best to use a switch made specifically for this purpose, which has a power-on indicator light so you know when the pump is activated. Connect these to the pump's power wires (or the separate float switch, if applicable; refer to the manufacture's wiring diagram included with the pump to identify which power wire is which) with more crimped butt-connecters protected by adhesive-lined heat-shrink tubing, and secure them every couple of feet. Then connect the wires to the switch's "on" and "automatic" positions, using either ring terminals or by soldering, as is appropriate for the type of switch. Note that this switch should be wired to a fused or breaker power connection at the helm, with the appropriate amperage as recommended by the manufacturer, unless it incorporates a fuse of its own. And remember that if you want the bilge pump to work when the battery switch is turned off you need to make a live connection, not one that goes dead when the switch is turned off. When wiring directly to the battery, such as in the case of very small tiller-steered boats that may not have fuse or breaker panels, install the fuse directly in-line as close to the battery as possible.

Step III: Installing The Thru-hull Discharge

You'll need to drill a hole in the hull-sides (ouch!) in order to give your pump an outlet. This is unnerving, but trust us, it's 100-percent necessary. Choose a thru-hull that matches the diameter of the pump's port size. Obviously, this will also determine the diameter of the discharge hose you use.

Locate a spot on the hull that's far enough above the waterline that it won't become submerged when the boat is fully loaded or heeling over. It should also be as close as possible to the pump, because long runs and bends in the discharge line will reduce the pump's capacity. The natural loss of pumping ability due to "head" (height above pump level and friction in the discharge hose) can cut a pump's capacity by as much as a third of what's advertised. On top of that, long runs can result in lots of backflow when the pump shuts off, and in extreme cases, enough backflow to re-start the pump — so keep the plumbing as short as possible.

The boat's gelcoat is less likely to splinter if you drill from the outside-in as opposed to the inside-out, but if nearby bulkheads, wires, or plumbing makes it imperative for you to get the exact location perfect, you may need to first drill a tiny pilot hole from the inside, so you can identify the specific spot while standing outside the boat. Remember, you'll minimize gelcoat splintering if you run the drill at full speed at all times (slower speeds only encourage the bit to grab and break off chunks of gel coat). Okay, it's time to grit your teeth and drill, baby, drill!

With your hole complete, glob some 3M 5200 around the insides of the fitting and the face of the nut (not the threads), insert the fitting into place, and spin the nut on. Whew! Time to take another break; the most stressful part of this job is now behind us.

Step IV: Installing The Discharge Hose

When you cut the hose to length, allow enough extra to shape a loop in it, just above the discharge. Make it a fairly large loop, which rises well above the thru-hull fitting, and secure it to the hullside with cushioned clamps. This is called an "anti-siphon loop," and although this bend will increase the head your pump must overcome, it also prevents water from back-flowing through the discharge hose — an imperative feature, if your discharge ever dips below the waterline. With the hose in place, secure it to the pump's discharge and the thru-hull's barb, using stainless-steel hose clamps. Then use cushioned clamps to secure the hose along its run.

Congratulations. You've just installed a new automatic bilge pump. Before launching your boat, give it a test by putting in the boat's plug(s) and filling the bilge with a hose until the automatic switch kicks in. Then, test it with the three-way switch. Finally, it's time to celebrate a job well done.

Capacity Conundrum

Just how much pumping capacity does your boat need? Will a single bilge pump do the trick, or should your boat have a pair of pumps — or even more? Ideally you should have the highest-volume pump possible for the space available. Whenever possible it’s advisable to have a double-pump arrangement, with the smaller pump mounted low to handle rain and spray, and a larger pump mounted a little higher in the bilge (along with a high-water alarm) to kick in when serious leaks need to be handled. Here are some specs from ABYC for installing electric bilge pumps:

• Discharge location should be above your maximum heeled waterline; or below your maximum heeled waterline if your discharge line is provided with both a seacock and a vented loop or other means to prevent siphoning into the boat. Don't use a check valve for this purpose.
• On boats with enclosed accommodations, an alarm should be installed, indicating that bilge water is approaching the maximum bilge-water level.
• Pumps with automatic controls need to have a visual indication that power is being supplied to the pump.

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Lenny Rudow

New Boats, Fishing & Electronics Editor, BoatUS Magazine

Top tech writer and accomplished sports fisherman, BoatUS Magazine Contributing Editor Lenny Rudow has written seven practical boating books, won 30 awards from Boating Writers International — many for his marine electronics articles – and two for excellence from the Outdoor Writers Association of America. He judges the NMMA Innovation Awards, and is Angler in Chief at FishTalk, his own Chesapeake-based publication. A great teacher and inspirational writer, Lenny hosts many of BoatUS Magazine’s very-popular how-to videos, which can be found on the BoatUS YouTube channel, or at BoatUS.com

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Get Pumped! How to Choose the Best Boat Bilge Pump, Plus 7 Tips for Preventative Maintenance

Several years ago, when my fishing buddy's bilge pump failed, we ended up swimming nearly a quarter mile to reach shore. While it's the least glamorous piece of equipment on your boat, it's ultimately responsible for keeping your craft afloat, which makes the bilge pump your best friend on the water.

It could even be considered a major piece of safety equipment . It keeps your deck dry, making sure all water remains outside of your boat and keeps passengers safely afloat.

If your bilge pump is maintained, this emergency need never occur. Unfortunately, bilge pumps rarely garner the same attention from boaters as electronic gadgets, luxury deck and cabin upgrades and recreational accessories. But they should!

The Importance of a Boat Bilge Pump

A bilge pump system is your primary insurance policy in avoiding unexpected sinking and losing your boat, all of its equipment and possibly the lives of everyone aboard.

One of the most prominent safety considerations is selecting a bilge system that's well matched to your boat's size and overall capacity. It's always better to have a bilge pump surpass your everyday needs, rather than save a few dollars and take the chance of being ill-prepared when the chips are down.

Standard bilge pumps are primarily designed for removing nuisance water from your boat that occurs incidentally after encountering waves, wakes and high winds.

Worst case scenarios: Your pump should provide sufficient time to find and plug the leak, or allow everyone onboard to put on personal flotation devices  if abandoning the vessel becomes necessary.

However, if you regularly travel offshore or in deeper, remote waters, consider equipping your boat with a secondary emergency bilge pump . Adding a second bilge pump that's capable of moving several hundred gallons of water per minute could save your craft from sinking.

Needless to say, these types of pumps are considerably more expensive than basic bilge pumps, but can end up being well worth the initial investment.

The 2 Types of Boat Bilge Pumps

Most electric bilge pumps on the market fall into two categories: Diaphragm and centrifugal.

Diaphragm Pumps

These boat pumps pull water in through the intake valve just like a vacuum cleaner and then forcefully discharge it through the designated output facility.

These self-priming units do a much better job of forcing water upward against gravity, but they fall short of transporting the same volume of water as a centrifugal pump of the same size.

They are also more easily fouled by bits of debris, which, if left unattended, might cause blockage causing the pump to overheat and eventually fail.

This Jabsco's 36680-2000 Marine PAR Belt Drive Bilge Pump  (Available on Amazon)   is a good choice for this water pump type. It has an auto shut-off feature for when the pressure builds up and a manual on/off switch in back.

Centrifugal Pumps

These boat pumps are low maintenance, economical, highly reliable and can move a lot of water. They also have the advantage of being much less sensitive to random bits of flotsam and other incidental debris.

On the downside, this feature can also cause significant wear on the bearing, which could lead to pump failure. A centrifugal pump also lacks the same strength and ability to push water vertically at the same rate as a diaphragm pump.

This Rule 380 GPH Centrifugal Pump (Available on Amazon) is an excellent option for boaters and comes in both 12V and 24V. Mounted below the waterline, it's completely submersible (should your waters rise too high).

I t pushes through lots of water (3,800 gallons-per-hour) but at a low pressure(7 - 10 psi).

7 Preventative Tips to Maintain Your Boat's Bilge Pump

The best ways to ensure you'll never have a problem with your bilge pump while afloat with a boat full of passengers is to regularly inspect your system. I recommend doing so at least once a month  during the seasons you generally use your boat.

Make sure you actually activate the pump and allow it to discharge water , rather than just flipping the switch on and off and assuming everything is alright simply because you hear the electric motor engage.

Disassemble your pump occasionally to check valves and diaphragms for noticeable wear or damage to the pliable neoprene components, and replace them if necessary.

Most importantly, make up a maintenance list (including the pump's brand, model and the manufacturer's stock numbers for each separate part). This will allow you to quickly order and replace anything you may need, including a new bilge pump, without expending more time in the repair process than necessary.

1. Check Your Battery

If your pump fails to operate with the helm switch in either the automatic or manual mode, check to make sure your battery switch is in the "on" position.

Then try operating a few other pieces of your electronic hardware to see if they are functioning. If they don't respond, it's possible that your battery either needs to be recharged or possibly even replaced.

The Mighty Max ML50- SLA is a maintenance-free, spill-proof battery that resists shock and provides top performance in both high and low temperatures.

2. Inspect the Fuse Connections

If your bilge pump won't start, but the battery switch is in the "on" position, it's possible you may have blown a fuse. Before proceeding any further, check the battery connections to make sure they're well-secured and free of corrosion.

If they are, continue on to find the point of malfunction, and then replace the defective fuse.

Blue Sea Systems ST Blade ATO/ATC (Available on Amazon) fuse blocks eliminate the tangle of in-line fuses for electronics and other appliances and consolidate branch circuits.

3. Ensure Helm & Float Switches Work Properly

If the manual switch at the helm is on and the pump is also operational, but no water is being discharged for the output, there's a possibility that you may have a problem with your float switch.

Clear away any dirt or other obstructing materials present. Then, put the helm switch into automatic mode before checking the float switch to make sure it's working.

This  Seaflo SFBS-30-01 Boat Bilge Pump Switch (Available on Amazon) is environmentally responsible and offers an updated design, which includes a removable base for easy cleaning and servicing as well as a heavy duty flow switch designed for the toughest of applications.

4. Double-Check Wiring

Regularly inspect your wiring to assure all cables, wires and other connecting points are clean, unbroken and well-secured. Use only crimped connections and spray or paste them with an anti-corrosion agent periodically.

Tip: Haphazard wiring is also a way to tell if your boat is a lemon .

This Choice Marine's 180-Piece Kit (Available on Amazon)  offers premium adhesive-lined waterproof Marine Heat Shrink Butt Connectors for marine vessels. They provide thick insulation and lasting durability that protects all of your boat's wiring and are backed by a 100% customer satisfaction guarantee.

5. Examine Your Pump Impeller

Your impeller should be able to be freely rotated with your finger. With the power off, make sure that this is still the case and if you detect any noticeable resistance.

Check the impeller to see if there is any type of foreign object stuck in it that might be creating a jam. If nothing is visible, you may need to replace your bilge pump .

This Johnson Pump Impeller (Available on Amazon) meets or exceeds the quality standards of your boat's original equipment, and is interchangeable with the GLM 24970, Evinrude/Johnson 311684, 984491, Mallory 9-37822, OMC 311684, 984491, Rochester 17078904 and several other makes. 

6. Clean the Screen of Blockage

Always keep your screen clean and free of any blockage to assure that water can move through it freely. Since they are extremely economical, you can afford to replace it regularly.

Pactrade Marine's In-Line Mesh Filter (Available on Amazon) is a stainless steel strainer that collects incidental debris, rust and scale. It's easily cleaned within minutes and also helps in protecting your pump from valve damage.

7. Inspect the Outlet Hose for Damage

If everything else is functioning properly, but very little water is being pumped out of the exit port, the problem could be as simple as a crimped, ripped or blocked outlet hose. Be sure to keep several onboard so they can be replaced whenever necessary.

The TRAC Bilge Pump Plumbing Kit (Available on Amazon) offers a durable outlet hose replacement, as well as a variety of additional accessories for attachment and repair.

Check Price on Amazon   - Better Boat's bilge cleaner emulsifies fuel, oil and grease in the bilge to allow it to be pumped out with a bilge pump.  Simply run the boat to get it all mixed in with the water already in the bilge. 

Your bilge pump is truly one of the most important pieces of equipment you have on your boat. No matter your boat 's size, whether a 40-foot yacht, a 28-foot deck boat or an 18-foot fishing skiff, regular  routine maintenance and cleaning of your bilge pump should remain a top priority.

Not doing so could result in an untimely catastrophe, for which you could be held legally responsible. On the other hand, ensuring your system always performs at maximum capacity will allow a relaxing and comfortable voyage knowing the water is outside the boat.

To be safe, we always recommend having a manual pump on board.  You never know when you may need it. 

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A Guide To Boat Bilge Pumps

A guide to boat bilge pumps – what are they and how they work.

The unsettling thing about bilge pumps is the fact that they are usually a boat’s only line of defense before sinking into the deep blue, yet most boaters don’t know much about them. Rarely do boaters even talk about bilge pumps, and even less of their time is spent going down below to maintain them.

Of course, it is important that you get to know more about your boat bilge pumps, as you don’t want to end up being the proverbial old sailor, frantically taking water out of the bottom of his boat with a bucket.

Let’s dive in and take a deeper look into bilge pumps, what they are, what they do, and how to pick the best one.

What Are Bilge Pumps?

The job of a bilge pump is to clear the unwanted water that gets into the bilge on your boat. This water can come in due to errant waves, drip through packing gland, a broken hose or clamp, leaking port holes or hatches, and much more. Essentially, bilge water is almost impossible to avoid. While the stock bilge pump that came with your boat may do the job well, though, you want to be sure that it acts as a serious line of defense in the case that your boat begins sinking out at sea, giving you enough time to call for help or make it back to the marina.

Most well-educated captains who plan to undertake long crossings over open water will upgrade their bilge pumps by adding a higher-volume one, as a backup.

How Do They Work?

There are three common types of electrical bilge pumps that you will find on the market, namely the centrifugal, the rubber lobe and the diaphragm.

Centrifugal pumps work using a rotating, solid impeller, which like a turbine will push water. This type of pump will propel water up into the discharge hose and usually sits in the lowest, deepest position of the bilge. That water is pumped from the bottom up, but once air comes in contact with the impeller, cavitation usually stops the movement of water completely. Once this type of pump shuts down, all of the water that is still sitting in the discharge hose comes gushing backwards into the bilge. So the base water line left behind, when these pumps shut down, is usually around 1 ½”. The twin seals between the impeller and the motor, protect the pump’s electric motor sitting in the bilge, for a time, limiting the life of the pump. Many boaters have tried to place a check valve on the output side, near these pumps in order to prevent the back wash, only to find that this creates a condition called vapor lock, where the pump can’t prime itself, as air becomes trapped between the pump and the check valve. These are still the most popular of all bilge pumps as they are very quiet, use little power for the volume of water pumped, are relatively inexpensive and usually have a 3 to a 4 year life span in the average wet bilge. Also, if these pumps are accidentally left on, there is usually little damage potential within the first few hours.

Rubber lobe bilge pumps used to be the most popular and common of all bilge pumps, until Clinton Rule invented the Centrifugal bilge pump back in the early 60’s. These pumps have a rubber impeller that spins in a housing where there is a restriction between the intake and outflow, causing the rubber lobes to crush temporarily, attempting to compress the water and forcing it out into the discharge port. These pumps are lower volume and not particularly electrically efficient. They can pull some air with the water, but cannot be left to run dry under any circumstances. Here, the water lubricates the rubber impeller as it spins in the housing. So, without water, the impeller heats up and starts to stick to the housing. Additionally, if oil or fuel ends up being pulled through the impeller, the rubber will usually expand, also locking the pump. They will offer you a brown Nitrile replacement impeller that should not absorb the oil, and then you ask yourself, why didn’t they automatically install the Nitrile one at the factory. Most of the engines on boats today use a mechanically driven rubber lobe pump for their raw water engine cooling systems.

Diaphragm pumps have chambers, and work more like your heart, where they pulse to move the water through the two chambers and two one-way valves. So, this type of pump creates a suction that pulls out the unwanted bilge water.  Diaphragm pumps can be run dry for a time without any damage, and are self-priming. This means that they develop suction and prime themselves without being submerged in water. Unfortunately, they cannot move as much water when compared to centrifugal pumps, and won’t be able to tolerate bits of debris or trash, which can lodge in the pump valves. These pumps will usually have an intake strainer that will fill with small debris and will have to be serviced / cleaned regularly. These pumps are the noisiest of all the pumps and again, these pumps are not as electrically efficient as the centrifugal pumps, but when set up correctly, they can draw the bilge water levels down to ½” in the manual mode. In the auto mode, when they are connected to the average float switch, they will usually still leave over an inch of water behind.

In simple terms, all bilge pumps leave residual bilge water behind and this is what brings us to the Arid Bilge System

The dry bilge system > The Arid Bilge System

For those who are in the market for the best of the best, we recommend the Arid Bilge System . The Arid Bilge System works uniquely as an automated computerized vacuum system, vacuuming up water from the bow to the mid to the stern of your vessel, through small tubing, up to 75 feet away from the central unit. Because it’s an automated system, you never have to think about going down to turn it on manually.

The Arid Bilge System utilizes air sensors/vacuum switches to make sure that the system knows when it is suctioning water vs air. It can be left to run dry forever… with no chance of damage to the internal air compressor. In fact, it does not pump water and there is no contact between the bilge water and any electrical component anywhere in the system. This means that there is no seal to fail, so you can expect excellent longevity from your new Arid Bilge System. The Arid Bilge System vacuums the bilge water into a small collection chamber inside the central unit, and then uses air pressure to push the collected water out through a check valve.

As an added safety feature we offer the Eco Friendly Discharge Companion/oily water separator which captures and stores oil that’s common in small amounts in many bilges. And an additional alarm is available to audibly notify you as oil starts to accumulate in the separator. With this system added to your Arid Bilge System, you can confidentially say that this oil slick surrounding your boat came from someone else’s boat.

You can see how the Arid Bilge System works with the little visual representation below:

Getting the Best Bilge System

Having a solid dry bilge system on your boat can create a happier and safer boating experience for you and the family. Don’t rely on old stock bilge pumps to keep you safe. Get yourself one of the best dry bilge systems around at Arid Bilge Systems !

Related Post

How To Prepare Your Boat Before Installing Your New Dry Bilge System

The Do’s and Don’ts of Treating Bilge Water

How Does the Arid Bilge System Work?

Bilge water is the biggest problem you don’t like to think about. Keep the bilge dry and transform your boating experience with Arid Bilge.

How It Works

Owners’ central, © 2023 • arid bilge systems – all rights reserved • privacy policy.

Best Boat Bilge Pumps: Top 8 Picks and Buying Guide

When looking for the best bilge pumps, it’s important to consider the materials and construction. Pumps made of corrosion-resistant materials, such as marine-grade stainless steel or high-quality plastics, are essential for longevity and performance in harsh marine environments. Finally, automatic pumps should have reliable float switches that trigger the pump when necessary, ensuring water levels in the bilge remain safe.

Navigating the world of boat bilge pumps can be daunting, but armed with this knowledge, you can confidently choose the right pump for your needs. To help make your decision easier, I have researched and tested a variety of bilge pumps to determine the top contenders in terms of capacity, durability, and overall performance.

Best Boat Bilge Pumps

I’ve compiled a list of the best boat bilge pumps available on the market. Check them out below to find the perfect one for your boating needs.

Johnson – 32503 Cartridge Bilge Pump 500 GPH

I recommend the Johnson 32503 Cartridge Bilge Pump 500 GPH for boaters seeking a dependable and efficient bilge pump to keep their vessel dry.

• Easy installation
• High-quality construction
• Effective water pumping
• Warranty not provided directly to consumers
• Hose ends not always included in packaging
• Requires 1 unknown battery

I recently installed the Johnson 32503 Cartridge Bilge Pump 500 GPH on my boat, and I’m impressed with its performance. The installation process was quick and simple to help my boat stay dry. Its 8.33 gallons per minute maximum flow rate does an exceptional job at removing water from my bilge, ensuring the safety and comfort of my vessel.

The Johnson bilge pump has a durable build that has withstood my frequent boating trips. It has proven itself as a reliable piece of equipment for navigating the waters. However, I discovered that the warranty coverage is only provided through distributors and not directly to consumers, which could be a potential drawback for some.

While the Johnson 32503 Cartridge Bilge Pump has worked well for me, I did have a minor issue with the packaging. The hose ends were not included in the box, but thankfully, I had spare parts on hand to remedy the situation. If you don’t have extra parts, this could be an inconvenience.

In conclusion, the Johnson – 32503 Cartridge Bilge Pump 500 GPH is a reliable and efficient solution for keeping your boat’s bilge dry. Its easy installation and effective water pumping make it a solid choice for any boater. Just be aware of the warranty coverage limitations and potentially missing hose ends.

Attwood Tsunami Bilge Pump

This Attwood Tsunami Bilge Pump is a reliable and powerful choice for boaters seeking high-efficiency bilge pumping performance.

• Compact design and innovative engineering
• High-capacity, rated for 800 gallons per hour (gph) at 13.6 volts DC
• Easy servicing with replaceable motor cores
• May leave some water in the bottom due to space between the pump and boat floor
• A bit pricier than some competitors’ models
• Outlet size might not fit all boat designs

I recently had the pleasure of using the Attwood Tsunami Bilge Pump on my boat, and I found it to be an incredibly reliable and efficient solution for keeping the bilge free of water. The pump’s compact design and innovative engineering make it easy to install, while the high-capacity output ensures that your boat stays dry.

One aspect I particularly appreciate about this pump is the ease of servicing, thanks to its replaceable and interchangeable motor cores. This feature allows for quick maintenance, ensuring that the pump remains in optimal working condition for a long time.

However, I did notice that the space between the pump and the bottom of my boat was slightly larger than I would have preferred, which can leave some water behind. Also, the Attwood Tsunami Bilge Pump is priced somewhat higher than some competitor models, which could be a consideration for those on a budget. Lastly, it’s essential to note that the outlet size might not fit all boat designs, so double-check the compatibility before purchasing.

Overall, I believe that the Attwood Tsunami Bilge Pump is a great choice for boaters seeking reliable bilge pumping performance. Its strong capacity, coupled with its compact and durable design, make it a worthy investment for anyone looking to keep their boat in top condition.

Attwood Sahara S500 Automatic Bilge Pump

The Attwood Sahara S500 is an efficient and hassle-free bilge pump any boat owner should consider for its various impressive features.

• Effective water pumping for boats of any size
• Compact and durable design with an all-in-one package
• Easy to install
• Requires frequent cleaning to avoid clogging
• Limited to horizontal mounting only
• Automatic mode can be inconsistent

I recently installed the Attwood Sahara S500 Automatic Bilge Pump on my boat, and its performance in providing reliable bilge water pumping has been commendable. As an all-in-one unit, it comes with a pump, wire seals, strainer, and a mercury-free switch, making it convenient and useful for boats of any size, whether they have sleeping accommodations or not.

The Attwood Sahara S500’s compact design is a significant advantage, as it fits perfectly in tight spaces. The installation process was quick and easy for me, although it’s important to keep in mind that this pump is limited to horizontal mounting only. With a 12-volt, 1.5-amp draw pump rated for 500 GPH performance at open flow, it operates efficiently and is suitable for most boat sizes.

However, there are a couple of drawbacks worth mentioning. Firstly, the pump requires regular cleaning to prevent clogging from debris, which could cause the pump to fail. Additionally, my experience with the automatic mode turned out to be slightly inconsistent, which may be a consideration for boat users who prioritize the reliability of automatic operation.

Overall, the Attwood Sahara S500 Automatic Bilge Pump offers good value when it comes to efficiency and ease of installation. If you’re willing to put in the effort to clean and maintain the pump regularly, the Attwood Sahara S500 is an ideal choice for keeping your boat dry and safe.

SEAFLO Automatic Submersible Boat Bilge Water Pump

This SEAFLO bilge water pump is a reliable and efficient choice for keeping your boat dry and safe.

• Compact and fully submersible
• Automatic built-in float switch
• Energy-efficient design
• Limited height difference in float switch operation
• Some units may have noise issues
• Float switch reliability concerns

When I first used the SEAFLO Automatic Submersible Boat Bilge Water Pump, I was impressed by its compact size and durable construction. This fully submersible electric pump features an automatic built-in float switch, eliminating the need for a separate switch. The pump remains energy-efficient as it doesn’t use power until it’s activated by the internal float switch when the water level rises.

The pump operates at 750 gallons per hour, which provides an effective solution for removing water from my boat’s bilge. It’s powered by a 12-volt DC source, making it ideal for most boat setups.

One minor issue I encountered while using this pump was the limited height difference in the float switch operation. Although the pump does its job effectively, you may need to monitor the water level for optimal performance. I also noticed that some units can be noisy, but after checking the impeller housing and adjusting it, the noise level was reduced.

Lastly, a few users have reported reliability concerns with the float switch. I personally haven’t experienced this issue, but it’s worth considering if you’re looking for a pump that will be consistently efficient in the long term. Overall, the SEAFLO Automatic Submersible Boat Bilge Water Pump is a practical solution for boat owners who need a reliable automatic bilge pump at a reasonable price.

Shoreline Marine Bilge Pump 600 Gph 3/4″

I recommend the Shoreline Marine Bilge Pump 600 Gph 3/4″ for its efficient performance and durable design, providing excellent value for boaters.

• Powerful output with 600 GPH
• Durable plastic housing and stainless-steel impeller shaft
• Universal mounting base for easy installation
• Manufactured in China, which may concern some buyers
• Lacks an automatic float switch, requiring a separate purchase
• Specifications indicate limitations with higher head heights

Upon installing the Shoreline Marine Bilge Pump 600 Gph 3/4″ on my boat, I noticed an almost instant improvement in water evacuation. The unit has an impressive output of 600 gallons per hour, ensuring that my bilge remains clean and dry throughout the day. It’s reassuring to know that the bilge pump is built to last in the harsh marine environment, thanks to its sturdy plastic housing and stainless-steel impeller shaft.

The universal mounting base made the installation of this bilge pump a breeze. It also simplifies future maintenance and cleaning tasks. Tinned marine-grade wiring provides another layer of reliability, which is essential when I’m out on the water.

Despite the impressive features of this bilge pump, I noted some areas for potential improvement. The fact that it is made in China may cause concerns for some buyers regarding its craftsmanship. Additionally, the pump doesn’t include an automatic float switch. This would have to be bought separately if you’re seeking an automated bilge water management system. Lastly, the flow rate decreases significantly at higher head heights, which might limit its usefulness in specific applications.

In conclusion, the Shoreline Marine Bilge Pump 600 Gph 3/4″ has proven to be a valuable addition to my boat’s safety and maintenance equipment. With its powerful performance and durable design, this bilge pump offers excellent protection against water accumulation in the bilge area. Although there are a few shortcomings, I believe this pump is a wise investment for any boater seeking an efficient and reliable bilge pump solution.

MAXZONE Automatic Submersible Boat Bilge Water Pump

In my experience, the MAXZONE Automatic Submersible Boat Bilge Water Pump is a reliable and efficient option for those looking to purchase a boat bilge pump.

• Impressive flow rate of 1100 GPH
• Built-in float switch for easy automatic operation
• Energy-efficient design – uses power only when activated
• Requires a 12V 8A power adapter, not included
• Outlet diameter might not fit all hoses
• The plastic material may not be as durable as metal options

When I installed the MAXZONE Automatic Submersible Boat Bilge Water Pump in my boat, I noticed that it did a great job of removing any water that accumulates. The pump’s 1100 GPH flow rate quickly clears out any standing water, ensuring my boat remains dry at all times.

One of the best aspects of this bilge pump is the built-in float switch. It eliminates the need for a separate float switch and makes the entire operation fully automatic. I didn’t have to worry about a thing – if the water level rose, the pump would activate and do its job without any intervention from me.

What I also appreciate about the MAXZONE bilge pump is its energy-efficiency. The pump only uses power when it’s activated by the internal float switch, which helps preserve battery life. However, it’s essential to note that you need a 12V 8A power adapter, which isn’t included with the pump.

One potential drawback is the outlet diameter of 1 1/8″. This might not fit all hoses, so double-check your hose size before buying. Additionally, while the plastic material is lightweight, it may not be as durable as some metal options in the long run.

Overall, in my opinion, the MAXZONE Automatic Submersible Boat Bilge Water Pump is an excellent choice for a boat bilge pump, offering efficient performance and ease of use with its built-in automatic float switch.

Sanuke 1100gph Bilge Pump

The Sanuke 1100gph Bilge Pump is a must-buy for its impressive flow rate, lasting performance, and quality materials.

• High flow rate of 1100 gallons per hour (GPH)
• Water-cooled engine for long service life
• Rust and corrosion-resistant materials
• Hose not included
• Wiring may need extension for some applications
• Can be difficult to find suitable hose

I recently had the chance to use the Sanuke 1100gph Bilge Pump on my fishing boat and was delighted with its performance. It’s designed with a water-cooled engine, which ensures a prolonged service life – a true testament to its durability. With an impressive flow rate of 1100 GPH, this pump efficiently handled the water removal from my boat, making it perfect for emergencies or regular maintenance.

One thing I noted about the Sanuke Bilge Pump is that it’s built to withstand the most adverse conditions. The ABS housing is impact-resistant, and its stainless steel shafts are rust and corrosion-resistant, making it ideal for the harsh marine environment.

Installation was straightforward, but I did have to purchase a hose separately as it wasn’t included. I also found that I needed to extend the wires a bit for my particular setup. However, these minor inconveniences were overshadowed by its overall performance and quality.

In conclusion, the Sanuke 1100gph Bilge Pump is a reliable and efficient choice for boat owners. Its high flow rate, water-cooled engine, and durable construction make it a perfect choice for handling water removal in the marine environment. Just keep in mind that you’ll have to buy a hose and may need to adjust the wiring depending on your needs.

Johnson Pumps – 22102 PROLINE Bilge Pump 1000 GPH 2.5A

The Johnson Proline Bilge Pump is a reliable and efficient choice for keeping your boat dry and safe.

• Powerful 1000 GPH pumping capacity
• Easy installation and compatibility
• Durable construction with DuraPorts
• 3/4″ connection may be small for some users
• No batteries included
• Limited warranty

I recently installed the Johnson Pumps Proline Bilge Pump on my boat and noticed an immediate improvement in how quickly water was removed. The 1000 GPH pumping capacity is impressive, making it a significant upgrade from my old 500 GPH pump. The DuraPorts ensure that the pump can withstand wear and tear, providing a reliable solution for any boating enthusiast.

What I really appreciated was the ease of installation. I was able to use the existing base from the previous pump and had no issues with the process. The pump operates quietly, which is a bonus on those peaceful days out on the water.

One thing to keep in mind is that this pump doesn’t come with batteries, so you’ll need to make sure you have a power source. Additionally, the 3/4″ connection might be too small for some users, so ensure it’s compatible with your boat setup before purchasing.

Although the Proline Bilge Pump comes with a limited warranty, it shouldn’t deter users from considering this pump as a dependable choice. The quality construction and performance outweigh its shortcomings.

In conclusion, the Johnson Pumps Proline Bilge Pump is a powerful, durable, and efficient choice that will help keep your boat safe and dry. Just be mindful of the connection size and the need for a power source, and you’ll have a reliable bilge pump that’s well worth the investment.

Buying Guide

When it comes to choosing the best boat bilge pump, there are a few important factors I need to consider to ensure that I get the most suitable and efficient product. Here, I will walk you through these factors to help you make an informed decision.

First and foremost, the capacity of the bilge pump is crucial. This is typically measured in gallons per hour (GPH). I need to evaluate my boat’s size and the amount of water it may take on in case of an emergency. A higher-capacity pump will be more effective in removing water quickly from the bilge area, but it may also consume more power. So, I’ll have to strike a balance between power efficiency and fast water removal.

Power Source

Bilge pumps can be powered by different types of power sources. The most common types include manual hand pumps, electric, and engine-driven pumps. Electric bilge pumps are the most popular, given their efficiency and ease of use. However, it is essential to ensure that my boat’s electrical system can handle the power consumption of the chosen bilge pump.

Automatic vs. Manual

Some bilge pumps come with automatic features, like a float switch, to activate the pump when the water level reaches a certain height. This can be a convenient option for me because it ensures that the pump operates only when it is needed. However, having a manual override option is also essential for added safety and control during emergency situations.

Installation and Maintenance

Ease of installation and maintenance should also factor into my decision. Many bilge pumps come with quick-release systems for simple installation and removal, making it easy for me to clean and maintain the pump periodically. Additionally, I should also consider the pump’s design and build quality to ensure it withstands harsh marine environments.

Price and Warranty

Lastly, the cost and warranty offered by the manufacturer are essential to consider. While it may be tempting to opt for a less expensive pump, I must keep in mind the old adage, “you get what you pay for.” A high-quality, dependable bilge pump may cost a bit more upfront, but it will likely save me money and stress in the long run. Moreover, checking the warranty offered allows me to gauge the manufacturer’s confidence in their product.

Frequently Asked Questions

What factors should i consider when selecting a bilge pump.

When selecting a bilge pump, it’s essential to consider factors like the size of your boat, the pump’s pumping capacity (measured in Gallons Per Hour or GPH), installation, and power source. Additionally, you should think about whether you require an automatic or manual bilge pump and if you need a pump with a float switch.

How does an automatic pump differ from a manual pump?

An automatic bilge pump activates when it senses water in the bilge, while a manual pump requires manual intervention to operate. Automatic pumps often come with built-in float switches and can be essential for detecting and removing water quickly, which can prevent damage to your boat. Manual pumps are useful as a backup option or in smaller boats where the bilge is easily accessible and water accumulation is minimal.

What are some reliable bilge pump brands?

Some well-known brands that produce reliable bilge pumps are Rule, Attwood, Johnson Pumps, and Jabsco. Each brand offers a range of bilge pumps to accommodate various boat sizes and pump capacities, so be sure to evaluate your specific needs when choosing a bilge pump.

Do I need a bilge pump with a float switch?

A float switch is a useful feature for an automatic bilge pump. When the water level rises in the bilge, the float switch is triggered, activating the bilge pump. Having a float switch in your bilge pump system adds an extra layer of protection by ensuring that the pump operates when needed. However, if you opt for a manual bilge pump or if your boat has minimal risk of water accumulation, a float switch may not be necessary.

How do I calculate the necessary gallons per minute for a bilge pump?

To calculate the necessary gallons per minute (GPM) for a bilge pump, first, determine the volume of your bilge area in cubic feet. Next, multiply this figure by the height of the compartment in feet. Finally, divide this result by the time you want the pump to empty the bilge (in minutes). For a safer estimate, consider selecting a bilge pump with higher GPM than your calculation to account for possible inefficiencies in operation.

What is the typical lifespan of a bilge pump?

The lifespan of a bilge pump varies based on factors such as usage, maintenance, and environmental conditions. Typically, a well-maintained bilge pump can last anywhere from 3-5 years or even longer with proper care. Regular inspection and cleaning can help extend the life of your bilge pump, ensuring that it operates efficiently when needed.

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Rule Non-Automatic 12 Volt Bilge Pump With 1-1/8'' Discharge The Rule Non-Automatic 12 Volt Bilge Pump With 1-1/8'' Discharge features a high pumping capacity and reliability at a lower cost. Containing more exclusive design features than any comparable...

Attwood Tsunami Cartridge Bilge Pumps

Attwood Tsunami Cartridge Bilge Pump With their innovative engineering and compact design, Tsunami pumps deliver high output from a small package. Attwood uses the most advanced material available, including the best quality bearings and...

Bilge Pump Hose - 6ft Section

Bilge Pump Hose - 6ft Section Black corrugated flexible hose for bilge pumps, livewells and areator systems cuffed every foot for cutting or clamping. .75" Diameter 6ft Length. Available in 3/4" or 1 1/8" Diameters.

Sea Dog Hand Bilge Pumps

Sea Dog Manual Bilge Pump Sea Dog Manual Bilge Pumps are constructed of durable UV-resistant injection-molded nylon and feature removable hoses and storage clips. These pumps are for use in small boats without electrical power or for larger boats in...

Sea Dog Bilge Pump Switch Panel w/ Circuit Breaker

Sea Dog Bilge Pump Switch Panel Features: The Sea-Dog 423040 Bilge Pump Switch Panel is injection molded ABS for maximum durability and corrosion resistance. This deluxe version comes with a three way switch allowing both Automatic and Manual...

Boat Bilge pumps provide a necessary function on all watercraft. The pumps remove excess water from the bilge area (the lowest part of every craft). This prevents engine damage and possibly the vessel from sinking. Bilge pumps for your boat are a crucial component, and Wholesale Marine has a broad selection of manual and electric bilge pumps for boats that are available in every size for all types of vessels. We carry the most reliable boat bilge pumps in the industry from leading brands like Attwood , Johnson Pump , Rule , and TRAC Outdoor .

Manually Activated Boat Bilge Water Pumps

Looking for a cost-effective option for fishing or smaller boats? Then a standard (manually activated) boat bilge pumps are the ideal choice. Some of our best-selling options include the Johnson Pump Proline Bilge Pump , which is fully submersible, as well as being ignition protected. It is available in 500, 750, and 1000 GPH models. For a quick and easy servicing option, the Attwood Tsunami Cartridge Pumps are a great compact pump with replaceable/interchangeable motor cores.

Automatic boat bilge pumps do not require a switch to activate and operate automatically, typically every 2.5 minutes. These automatic boat pumps are required for boats larger than 20 feet with sleeping accommodations. Wholesale Marine stocks a wide range of automatic boat bilge pumps in a variety of brands and pumping capacities from 500 up to 1500 GPH (gallons per hour).

Captaining a small vessel? The TRAC Automatic Bilge Pump 600 GPH is a smart, reliable solution that displaces 600GPH with a low power draw and will even run dry without sustaining damage. The Attwood Sahara Automatic Bilge Pump is available in 550-1100 GPH sizes and, great news for DIYers, it comes with everything you need to install. It is also covered by a 3-year manufacturer’s warranty.

Wholesale Marine has an extensive selection of manual boat bilge pumps from trusted brands like Beckson Marine , Sea Dog Marine , and Whale Marine . Manual pumps are an invaluable resource if your boat loses power. The Sea Dog’s Hand Pump is an excellent choice should your craft experience a power outage. These bilge pumps for boats are lightweight and compact, and a dependable option for small craft or larger vessels in an emergency.

If you are in a situation where you need water pumped fast, the Whale Marine Gusher 10 Manual Pump is a great choice. This manual pump goes right to work has a flow rate up to 17 gallons of water per minute.

Marine Bilge Pump Switches & Hoses.

Need to repair or upgrade your current bilge system? Wholesale Marine offers a wide selection of bilge hoses, clamps, and switches. Whether it is an automatic or manual system, we have all the parts you’ll need. Our reliable parts are resistant to oily bilge, seawater, as well as extreme temperatures

Your knowledgeable team at Wholesale Marine is available Monday through Friday from 9:00 AM to 6:00 PM to provide advice on upgrading your boat sanitation system. Talk to us today. Don’t forget to ask one of our customer service representatives about our Captain’s Club Rewards Program for additional discounts and savings.

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