5 kW Air Source Heat Pump running cost — Domestic hot water only (2 h)
A 5 kW Air Source Heat Pump (COP 2.7, BEIS data) draws 1.85 kW of electricity per hour. Running 2 hours/day uses 3.7 kWh and costs 96.7p/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
5 kW Air Source Heat Pump — Domestic hot water only (2 h): 5 kW ÷ COP 2.7 = 1.85 kW electricity draw × 2 h = 3.7 kWh/day = 96.7p/day. Weekly: £6.77. Annual: £352.97. Context: Summer use, hot water production only. Source: DESNZ/BEIS (OGL v3.0) + Ofgem.
- Per day
- 96.7p
- Per week
- £6.77
- Per month
- £29.41
- Per year
- £352.97
System specification
- Heat output
- 5 kW
- Type
- Air-source (ASHP)
- Seasonal COP
- 2.7
- Electricity draw
- 1.85 kW/h
- Daily kWh
- 3.7 kWh
- Scenario
- 2 h/day
BEIS Heat Pump Information Note 2024 — 5 kW ASHP, typical SCOP 2.7 for UK climate
How the cost is worked out
- Electricity draw per hour: 5 kW ÷ COP 2.7 = 1.85 kW.
- Daily kWh: 1.85 kW × 2 h = 3.7 kWh.
- Daily cost: 3.7 kWh × 26.11p/kWh = 96.7p.
- Weekly: 96.7p × 7 = £6.77.
- Annual: 96.7p × 365 = £352.97.
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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).