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Comparison brief

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Home heating

With the £7,500 grant, a heat pump repays its extra £500 cost in 4 years

After the grant a heat pump costs £3,500 to buy and fit. A gas boiler costs £3,000. The heat pump costs £855 a year to run. The boiler costs £980.

Heat pump

Air source, 7 kW

Measure
Gas boiler

Condensing combi, 30 kW

£3,500
Cost to buy and fit, after grant
£3,000
£855
Running cost per year
£980
0.6
CO2 per year, tonnes
2.3
3.2
Heat out per unit of energy in
0.9
20
Expected life, years
15

After 15 years the heat pump has cost £1,375 less than the boiler

Cumulative saving of a heat pump over a gas boiler in pounds, by years since installation. Includes purchase after the £7,500 grant, energy and servicing

Without the grant the heat pump costs £11,000 to buy and fit. That is £8,000 more than the boiler. A saving of £125 a year would take 64 years to repay it.

The January energy bill is £142 for the heat pump and £158 for the boiler

Estimated monthly energy cost for heating and hot water. Both charts use the same scale. The heat pump's bill is lower in all 12 months.

Heat pump

Gas boiler

Cost over 15 years by part

Energy is £12,075 of the heat pump's cost. It is £13,500 of the boiler's.

Heat pump

Gas boiler

Verdict
Choose the heat pump if you get the grant and will stay at least 5 years

Without the grant the boiler is cheaper. The figures assume electricity and gas prices stay at their Q4 2024 levels.