Shurflo by Pentair

Marine water pumps are used to move fresh water, bilge water, or waste through a boat's onboard systems, keeping everything from drinking water to sanitation running reliably. Different pump types handle different jobs, so choosing the right one depends on your system's pressure needs, flow rate, and power source.

Marine pressure pumps are designed for boat owners who need a reliable, on-demand water supply for sinks, showers, or galley faucets aboard their vessel. They work especially well on sailboats, powerboats, and liveaboards where consistent water pressure is needed without a direct city water hookup.

Start by matching the pump's flow rate and pressure rating to your boat's plumbing demands, then confirm the voltage matches your onboard electrical system. A larger vessel with multiple fixtures will need a higher GPM rating, while a small cabin cruiser may do fine with a lower-output model.

A bilge pump removes unwanted water that collects in the lowest part of a boat, while a freshwater pressure pump delivers clean water to onboard fixtures on demand. The two serve completely different functions and are not interchangeable, even though both move water through the vessel.

No, not all marine water pumps are compatible with both voltages — most pumps are rated for either 12VDC or 24VDC, so you need to match the pump to your boat's specific electrical system. Always check the pump's voltage rating before purchasing to avoid damage or poor performance.

Flush the marine water pump with clean water after saltwater exposure, inspect the inlet strainer regularly for debris, and check fittings for leaks at the start of each season. Keeping the strainer clear is one of the most effective ways to extend pump life and maintain steady flow.

Because without an accumulator tank, a marine pressure pump cycles on and off rapidly every time a faucet is opened, which causes premature motor wear and uneven water pressure. An accumulator tank stores pressurized water so the pump runs less frequently and your onboard water flow feels smoother and more consistent.

Yes, a self-priming marine pump is generally better suited for boat use because it can draw water from a tank or source below the pump without needing to be manually filled first. This makes installation more flexible and startup more reliable, especially after the system has been drained or winterized.

Marine pumps used on boats should be designed to handle the vibration, moisture, and corrosion that come with a marine environment, and models intended for potable water must be safe for contact with drinking water. Always verify that a pump is rated for its intended application, whether that is fresh water, bilge, or waste.

Marine washdown pumps are built to deliver higher-pressure output for rinsing down decks, anchors, and gear, while standard freshwater pressure pumps are optimized for steady, lower-pressure flow to onboard fixtures. Washdown systems typically include a dedicated hose and nozzle, making them a purpose-built solution rather than a substitute for a freshwater pump.