Heat pump running cost in South West
In South West, electricity is about 26.39p/kWh and gas about 7.48p/kWh (Ofgem cap, 2026). A typical 3-bedroom semi (around 12,000 kWh of heat a year) would cost roughly £905/yr to run an air source heat pump (SCOP 3.5), versus about £1,103/yr on gas. That is about £199 saved a year. Enter your own home below to see your figure.
Your region (sets local prices)
Property type
Bedrooms
Insulation
Current heating & its price
p/kWh
p/kWh
A heat-pump tariff can be ~13-15p.
Efficiency. 3.5 is typical.
£
A heat pump would cut your heating bill by
£199/yr
18% cheaper to run · ~6kW system
- Now: mains gas heating
- £1,103/yr
- Heat pump running cost
- £905/yr
- Gas standing charge saved
- £106/yr
- Install after grant
- £3,750
- Payback time
- 18.9 years
- CO₂ saved
- 1,730 kg/yr
Estimate only. Real figures depend on your home, install and tariff. Prices: Ofgem cap, Jul-Sep 2026.