Choosing a replacement bilge pump

Record the existing installation

When replacing a fitted pump, begin with its nameplate and the arrangement around it. A readable model number and photographs of the outlet, strainer, switch and mounting area make a replacement enquiry much clearer.

State whether the request is for normal bilge drainage, a replacement within an existing system or a new pumping duty. For harbourcraft, include any vessel specification or survey requirement that the replacement must meet.

Six details to check

Voltage

Read the pump label and confirm the vessel supply. Keep 12 V and 24 V requirements explicit in the enquiry.

Discharge connection

Record the hose internal diameter and the pump outlet size. Include a photograph if an adaptor is fitted.

Lift and hose route

Give the approximate rise from the pump to the discharge, hose length and number of bends. These are relevant when checking delivered flow.

Available space

Measure the mounting area and overhead clearance, including access to remove the strainer for cleaning.

Switching

Say whether operation is manual, controlled by a separate float switch or handled by an automatic pump. Include the existing switch model where available.

Electrical details

Photograph the current circuit information if available. Cable and circuit protection must be checked for the selected model rather than copied from a different pump.

Compare more than the GPH figure

Published open-flow capacity is not a promise of the flow at your discharge point. Use the performance information for the actual model and installation when comparing alternatives.