Running costs
What does your boiler actually cost to run?
Heating and hot water is normally the biggest slice of a household's energy bill. An old non-condensing boiler wastes roughly a quarter of the gas it burns — a modern A-rated condensing boiler runs at around 94% efficiency.
Boiler running-cost calculator
See roughly what your heating costs now, and what an A-rated condensing boiler would cost instead.
Now, per year
£748
New boiler
£636
You'd save
£111
Estimates only. Real savings depend on insulation, controls, thermostat settings and how you use hot water.
How to cut it further
Five things that lower your gas bill
- Fit weather compensation or a smart thermostat so the boiler modulates instead of cycling.
- Turn the radiator flow temperature down to 55-60°C — condensing boilers are far more efficient in condensing mode.
- Balance the radiators and fit TRVs so you only heat the rooms you use.
- Powerflush a sludged system — cold spots make the boiler work far harder than it needs to.
- Service the boiler annually; a poorly set burner quietly costs you money all winter.
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