All UK heat pump calculators
Eight focused tools that answer one question each — picked from the real Google search queries UK homeowners type before booking a heat pump survey.
Heat Pump Cost Calculator
Total installed price including the £7,500 BUS grant and net cost to you.
Most popularHeat Pump Size Calculator
Right kW capacity for your floor area & property age. Avoid oversizing.
Air Source Heat Pump Cost
ASHP-only pricing, with installer cost ranges by property size.
Heat Pump Savings Calculator
Annual running cost vs gas boiler, with 15-year cumulative savings.
BUS Grant Calculator
£7,500 Boiler Upgrade Scheme eligibility checker in 60 seconds.
Grant toolHeat Pump vs Gas Boiler
15-year side-by-side total cost of ownership for your specific home.
Octopus Heat Pump Cost
Cosy & Go smart-tariff running cost vs standard cap.
Hybrid Heat Pump Cost
Heat pump + gas boiler combo cost and break-even analysis.
Which calculator should you use first?
If you're brand new to heat pumps, start with the Heat Pump Cost Calculator — it answers the single question most UK homeowners type into Google: "how much will this actually cost me?" Once you have a rough installed price, move to:
- Heat Pump Size Calculator — confirm the kW capacity quoted by installers is actually correct for your property (oversized systems waste money).
- Heat Pump Savings Calculator — work out whether the running cost makes sense vs your current gas bill.
- BUS Grant Calculator — check you'll actually qualify for the £7,500 before you commit.
The other four calculators answer more specific questions: ASHP-only pricing if you've ruled out ground source, gas-vs-pump direct comparison if you're on the fence, and Octopus / hybrid scenarios for the smart-tariff and gradual-transition crowd.
How accurate are these numbers?
The calculators use installer pricing data from Q1 2026 MCS-certified quotes, the October 2025 Ofgem price cap, and BUS grant rules current at the time of writing (May 2026). For any individual home, the actual quote will swing ±15–20% depending on your property's specifics — pipework, electrical capacity, scaffolding requirements, and whether radiators need upgrading. Use these tools to filter installer quotes for plausibility, not to replace a proper MCS heat-loss survey.