Free Heat Pump Calculators
Work out your BUS grant eligibility, running costs and estimated savings before committing to a heat pump installation.
✓
BUS Grant Eligibility Checker
Most popular5 quick questions to find out if you qualify for the £7,500 Boiler Upgrade Scheme grant.
Open calculator
£
Running Cost Calculator
Compare annual heat pump running costs against your current gas, oil or LPG heating. Includes Ofgem Q1 2026 tariffs.
Open calculator
%
Savings Estimator
Estimated annual savings and payback period based on your property type, bedrooms and current heating.
Open calculator
kW
Heat Pump Size Calculator
NewWork out what kW heat pump you need. Based on property type, bedrooms, insulation level and build age.
Open calculator
About these calculators: All calculations use Ofgem Q1 2026 tariffs (electricity: 24.5p/kWh, gas: 6.4p/kWh) and average UK heating demand data. Results are estimates only and should not be relied upon for financial decisions. Always commission a professional heat loss survey.