Automatic bilge pumps – for convenience and peace of mind on board

Buy an automatic bilge pump for your boat

An automatic bilge pump is the perfect choice for boat owners who regularly leave their craft unattended. These pumps switch on automatically when water is detected in the bilge, and switch off automatically once the water has been pumped out. This provides maximum protection against unwanted water accumulation, even when you are not there.

Benefits of automatic bilge pumps

Suitable for absence: switches on and off independently

Protects the boat from flooding in the event of a leak or rain

Choice of integrated or separate float switch

Can be combined with switch panel with indicator

Prevents damage to engine, interior and electronics

Frequently Asked Questions

Do I need a control panel for an automatic pump?

No, it is optional. An automatic pump also works without a panel. With a panel you do have more control and manual operation.

What is the difference between a pump with and without a built-in float switch?

A built-in switch means fewer parts and easier installation. A separate switch gives you more flexibility in placement and maintenance.

Is a fuse required when connecting?

Yes, a suitable fuse (usually 5–10A depending on pump model) is recommended to protect your system.

What is the correct wire thickness?

For 12V systems you usually use at least 1.5 mm² wire up to 5 meters long. For longer distances or higher current 2.5 mm².

How do I connect a bilge pump?

Automatic bilge pump connection diagram (without switch panel)
Required:
Bilge pump (12V or 24V)

Float switch (if external)

Battery

Fuse holder with fuse

Electrical wire (minimum 1.5 mm²)

Crimp connections or clamps

Connection diagram:
Minus connection pump (black) → directly to negative terminal (-) of the battery.

Positive connection pump (red) → via the float switch to the positive terminal (+) of the battery.

Place a fuse in the positive lead between the float switch and the battery.

If you are using a pump with a built-in float switch, connect the red wire directly to the positive terminal of the battery, with a fuse in between.

Optional with switch panel (manual/automatic/off):
Use a 3-way switch and route the power through the panel.

Typically such a panel has 3 wires: manual mode, automatic mode (via float), and common ground.