8 kW Air Source Heat Pump running cost — All-day heating (18 h)
A 8 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 2.96 kW of electricity per hour. Running 18 hours/day uses 53.3 kWh and costs £13.93/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
8 kW Air Source Heat Pump — All-day heating (18 h): 8 kW ÷ COP 2.7 = 2.96 kW electricity draw × 18 h = 53.3 kWh/day = £13.93/day. Weekly: £97.48. Annual: £5082.75. Context: UK winter, poor insulation or large detached home. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £13.93
- Per week
- £97.48
- Per month
- £423.56
- Per year
- £5082.75
System specification
- Heat output
- 8 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 2.96 kW/h
- Daily kWh
- 53.3 kWh
- Scenario
- 18 h/day
BEIS Heat Pump Information Note 2024 — 8 kW ASHP, typical SCOP 2.7 for UK climate
How the cost is worked out
- Electricity draw per hour: 8 kW ÷ COP 2.7 = 2.96 kW.
- Daily kWh: 2.96 kW × 18 h = 53.3 kWh.
- Daily cost: 53.3 kWh × 26.11p/kWh = £13.93.
- Weekly: £13.93 × 7 = £97.48.
- Annual: £13.93 × 365 = £5082.75.
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COP 2.7 from DESNZ/BEIS — Heat Pump Information Note: Seasonal Performance Data 2024 (OGL v3.0). Unit rate 26.11p/kWh from Ofgem — Energy price cap unit rates and standing charges (1 July to 30 September 2026).