Collection: Pumps

Bilge pumps: drainage, transfer and water circulation aboard

Pumps perform simple yet critical functions on a boat: draining bilge water, moving gray water, supplying a livewell, triggering an alarm or maintaining a usable plumbing circuit. A poorly chosen pump may lack flow, consume too much power, clog quickly or become inaccessible when it needs to operate.

This collection groups pumps and associated equipment available for the boat's plumbing circuits. It covers electric pumps, bilge pumps, livewell pumps and associated alarm or control interfaces. For equipment dedicated to water drainage at the boat's lowest point, see also the Bilge collection.

Families in this collection

• Electric pumps: used for gray water, transfer or circuits requiring regular operation on 12/24 V power.
• Bilge pumps: designed to evacuate water accumulated at the boat's lowest point, with flow rates suited to safety situations.
• Livewell pumps: intended to circulate or renew water in a livewell or specific circuit.
• Controls and alarms: panels that allow monitoring the circuit and signaling abnormal water rise or pump activation.

Available products

• Whale Gulper 320 24 V: electric pump suitable for gray water or certain bilge circuits, designed to minimize clogging on loaded fluids.
• Rule submersible bilge pump 14 000 L/h 24 V: high-flow pump for bilge water evacuation on 24 V systems.
• Rule livewell pump 24 V 235 L/min: electric pump for livewell water circulation or equivalent circuits.
• Mastervolt bilge pump alarm control panel series 3: control and alarm interface for monitoring the bilge system.

Flow, voltage and actual losses

The nominal flow rate of a pump is an indicator, not a guarantee of installed flow. Once the hose, bends, discharge head and hull outlet are factored in, actual flow can drop sharply. For a bilge pump, therefore, consider the useful flow rate inside the boat, not just the liters per hour shown on the product sheet.

• Voltage: verify compatibility with 12 V or 24 V boat electrical system.
• Discharge head: the higher the water must rise, the more flow drops.
• Hose diameter: a hose that is too narrow or pinched reduces performance and stresses the pump.
• Fluid type: clean water, gray water, loaded bilge or livewell require different technologies.
• Usage cycle: a safety pump, a service pump and a circulation pump do not operate under the same conditions.

Installation and safety

A pump must remain accessible. The strainer, pump body, fittings, optional check valve and electrical connections must be inspectable and maintainable. The electrical circuit must be protected by a properly rated fuse or circuit breaker, with appropriate cable gauge and clearly identified controls.

For bilge pumps, an alarm is highly recommended when the compartment is not visible. It allows knowing if a pump is running too often, too long or if the water level is rising. This information is what turns a simple pump into a true safety system.

Common mistakes

• Choosing a pump based solely on nominal flow without accounting for pressure losses.
• Installing a pump too low or too far without access to clean the strainer.
• Using an unsuitable hose, too small or with too many bends.
• Failing to distinguish bilge pump, gray water pump and livewell pump.
• Omitting the alarm when the pump operates in an invisible area.

Skysat advice

For a marine pump, always start with the actual use: draining a bilge, moving gray water, supplying a livewell or monitoring water level. Then select voltage, flow rate, fittings and controls. A reliable pump is one that is properly sized, accessible, electrically protected and tested regularly.