Calculator • Heat Pump Sizing

Heat Pump Size Calculator

Estimate the heat pump size your home may need based on floor area and retrofit profile. Use this as a guide only — final sizing should always be confirmed with a proper room-by-room heat loss survey.

Your home details

Enter best estimates. Final sizing should be based on a proper survey.

Running cost assumptions

Electricity price 27.7p/kWh
Cheap EV tariff ≈ 15p • Typical ≈ 27–30p • High ≈ 40p
Assumed SCOP 3.8
Lower = higher bills • Higher = better design / emitters

Running cost is an estimate. Real-world results depend heavily on heat loss, emitter sizing and commissioning.

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bedfordshire, northamptonshire & surrounding areas

At Matt Poulter Plumbing & Heating, every plumbing, heating and bathroom job is completed with precision, care and years of hands-on expertise with a genuine attention to detail. Whether it’s a boiler installation, a full bathroom renovation or everyday plumbing work, we focus on doing the job properly the first time.
We don’t cut corners, rush finishes or overlook the small details that make a big difference.
Because of this approach, call-backs are extremely rare – our work is built to last, giving you reliable results and complete peace of mind long after we’ve packed up our tools.