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Heat Ledger

Gas boiler or heat pump: compare the running costs

See both yearly running costs side by side, using Ofgem's price cap rates for your region. Free, with no sign-up.

Compare running costs

For Great Britain only, using the maximum a supplier may lawfully charge per unit under Ofgem's domestic price cap — not a price, a bill, or an estimate of what you will actually pay.

Choose a calculator

  • Heat pump vs gas running cost

    A gas boiler and an air source heat pump side by side, for your region and how you pay.

  • Gas boiler running cost

    What the gas your boiler uses costs in a year, at price cap rates.

  • Heat pump running cost

    What a heat pump's electricity costs in a year, at price cap rates, with a range from 428 measured homes.

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    Solar panels and batteries

    A calculator for solar panels and battery storage is on its way.

Built to be checked

  • Workings shown. Every result explains how it was worked out, and what it can't tell you.
  • Real data. Unit rates from Ofgem's price cap. Heat pump figures from 428 heat pumps measured in real homes by Energy Systems Catapult.
  • Private by design. The sums run in your browser. Nothing you type is sent to us.