8 kW Air Source Heat Pump running cost — Mild winter day (8 h)
A 8 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 2.96 kW of electricity per hour. Running 8 hours/day uses 23.7 kWh and costs £6.19/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
8 kW Air Source Heat Pump — Mild winter day (8 h): 8 kW ÷ COP 2.7 = 2.96 kW electricity draw × 8 h = 23.7 kWh/day = £6.19/day. Weekly: £43.32. Annual: £2259.00. Context: UK winter (Nov–Mar), outdoor temp 5–10°C. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £6.19
- Per week
- £43.32
- Per month
- £188.25
- Per year
- £2259.00
System specification
- Heat output
- 8 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 2.96 kW/h
- Daily kWh
- 23.7 kWh
- Scenario
- 8 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 × 8 h = 23.7 kWh.
- Daily cost: 23.7 kWh × 26.11p/kWh = £6.19.
- Weekly: £6.19 × 7 = £43.32.
- Annual: £6.19 × 365 = £2259.00.
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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).