Size a submersible well pump from depth, flow demand and pressure requirement.
Total dynamic head combines the physical lift, the pressure the system must deliver and friction in the pipework. Because power scales with both flow and head, an oversized pump wastes energy continuously. Head rather than depth determines pump selection, and the pressure component alone can add thirty metres of equivalent lift on a domestic system.
Well Pump
Power = ρ·g·Q·H ÷ efficiency, where H is total dynamic head
Power = ρ·g·Q·H ÷ efficiency, where H is total dynamic head Total dynamic head combines the physical lift, the pressure the system must deliver and friction in the pipework. Because power scales with both flow and head, an oversized pump wastes energy continuously.
Head rather than depth determines pump selection, and the pressure component alone can add thirty metres of equivalent lift on a domestic system.
This calculator takes 5 inputs: Pump setting depth, Fixtures served, Target system pressure, Horizontal pipe run, Pump efficiency. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.