8 kW Air Source Heat Pump running cost — Spring/autumn shoulder season (5 h)
A 8 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 2.96 kW of electricity per hour. Running 5 hours/day uses 14.8 kWh and costs £3.87/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
8 kW Air Source Heat Pump — Spring/autumn shoulder season (5 h): 8 kW ÷ COP 2.7 = 2.96 kW electricity draw × 5 h = 14.8 kWh/day = £3.87/day. Weekly: £27.08. Annual: £1411.87. Context: UK spring/autumn (Mar–May, Sep–Nov). Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- £3.87
- Per week
- £27.08
- Per month
- £117.66
- Per year
- £1411.87
System specification
- Heat output
- 8 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 2.96 kW/h
- Daily kWh
- 14.8 kWh
- Scenario
- 5 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 × 5 h = 14.8 kWh.
- Daily cost: 14.8 kWh × 26.11p/kWh = £3.87.
- Weekly: £3.87 × 7 = £27.08.
- Annual: £3.87 × 365 = £1411.87.
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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).