Heat pump savings calculator

See if a heat pump genuinely makes financial sense for your home, using current Ofgem price cap rates and the BUS grant.

Verified: 1 April 2026 from Ofgem price cap

How is this calculated?

Annual gas usage (kWh)Find this on your annual energy statement, or estimate from billsHeat pump install cost (£)Total quoted cost before any grantGrant amount (£)£7,500 for Boiler Upgrade Scheme in England/WalesHeat pump SCOPSeasonal efficiency. 3.0 is typical, 3.5+ is well-designedGas unit rate (p/kWh)Default is current price cap. Check your bill if differentElectricity unit rate for heat pump (p/kWh)Standard tariff is ~25.73p; heat pump tariffs are 15p; Octopus Cosy is lower

Remove gas supply entirely (saves the gas standing charge)