Heat Pump Cost Calculator
Estimate the install cost of an air source heat pump after the Boiler Upgrade Scheme grant, plus its annual running cost compared with a gas boiler.
Estimate only. This is an indicative estimate, not a quote. BUS grant eligibility varies by property and installer, get quotes from MCS-certified installers before committing.
Enter your property details
Your install cost, running cost and saving vs gas appear here as you type.
How heat pump cost and savings are estimated
Install cost is priced per kW of recommended heat pump size, a small property typically needs around 5kW, a medium property around 8kW, and a large property around 12kW, though the right size really depends on a proper heat loss survey. At an indicative ~£1,250 per kW, an 8kW system costs roughly £10,000 before any grant; the Boiler Upgrade Scheme (BUS) then knocks a flat £7,500 off the install cost for eligible homes in England and Wales. Running cost converts your annual heat demand into the electricity a heat pump would use, based on a seasonal coefficient of performance (SCOP) of 3.5, meaning each unit of electricity delivers 3.5 units of heat, priced at your electricity rate, and compares that with the same heat demand delivered by a gas boiler running at 90% efficiency, priced at your gas rate. Because electricity costs several times more than gas per kWh in the UK, a heat pump's running cost can end up similar to or even higher than gas despite being far more efficient, the saving shown can be negative, and a better outcome usually needs a cheaper electricity tariff, solar panels, or a genuinely well-insulated home with a high real-world SCOP.
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