Heat Pump Cost Calculator UK
Estimate annual air source heat pump running cost in the UK and compare it with a gas or oil boiler delivering the same heat output.
Heat pump electricity = heat demand / COP. Boiler gas input = heat demand / boiler efficiency.
Use seasonal COP where possible
A seasonal performance figure is usually more useful than a best-case COP from a single mild day. The lower the COP, the more electricity the heat pump needs for the same heat.
Gas, oil and electricity prices
The calculator is most useful when you enter your own tariff. Small changes in pence per kWh can move the comparison between heat pump and boiler running cost.
Running cost is not the full decision
Installation cost, grants, insulation, hot water setup, noise and maintenance should also be considered before replacing a boiler.
Related calculators
For electricity use behind the heating estimate, try the electricity cost calculator. For solar assumptions, try the solar calculator payback tool.
Heat pump FAQ
What is COP?
COP, or coefficient of performance, estimates how many units of heat a heat pump produces for each unit of electricity.
Why compare with boiler efficiency?
A boiler uses more fuel energy than useful heat delivered, so efficiency helps compare like-for-like heat output.
Can I compare a heat pump with an oil boiler?
Yes. Use the boiler side as a like-for-like fuel comparison by entering the oil-equivalent unit price and the boiler efficiency.
What COP should I enter for an air source heat pump?
Use a seasonal performance figure if you have one. If not, test several COP values, such as 2.5, 3.0 and 3.5, to see how sensitive the running cost is.
How do I estimate heat pump cost in the UK?
Divide annual heat demand by the heat pump COP to estimate electricity use, then multiply by your pence-per-kWh electricity price.
Does this calculate installation cost?
No. This is a heat pump running cost calculator. Installation cost, grants, insulation work and radiator changes should be checked separately.