Boiler Usage Cost Calculator

Energy rates

Last updated 1 October 2026. Ofgem Direct Debit average, including the standing charges.

Gas rate (£/kWh)

Electric rate (£/kWh)

Hot water power (kW)

Central heating power (kW)

Hot water electric max (kW)

Heating electrical max (kW)

Hot water (hours/year)

Central heating (hours/year)

Gas (£/day)

Electric (£/day)

Heating and hot water a year £2,471.86

Annual running costs

Hot water £526.66

Central heating £1,645.90

Hot water and heating £2,172.56

Standing charges

Gas £105.85

Electric £193.45

Standing charges £299.30

Hourly cost

Hot water £2.93

Central heating £1.65

Energy a year

Hot water gas 6,480 kWh

Hot water electric 27.54 kWh

Heating gas 20,000 kWh

Heating electric 100.00 kWh

Estimate only. Actual cost depends on how the boiler runs, its efficiency, and the tariff. Use the rate on your bill.