500 W Panel Heater running cost — 3 h weekend daytime
A 500 W Panel Heater (500 W) running 3 hours/day uses 1.50 kWh and costs 39.2p/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
500 W Panel Heater — 3 h weekend daytime: 500 W ÷ 1000 × 3 h × 26.11p/kWh = 39.2p/day. Weekly (2 days): 78.3p. Annual: £40.73. Coverage: Small bedroom, bathroom, hallway (~8 m²). Source: Energy Saving Trust (wattage, typical/indicative); Ofgem (OGL v3.0).
- Per hour
- 13.1p
- Per day (3 h)
- 39.2p
- Per week (2 days)
- 78.3p
- Per year
- £40.73
Heater specification
- Rated power
- 500 W (0.5 kWh/h)
- Coverage
- Small bedroom, bathroom, hallway (~8 m²)
- Cost per kWh (Ofgem cap)
- 26.11p
- Cost per hour
- 13.1p
Energy Saving Trust — typical 500 W panel heater rating
How the cost is worked out
- Wattage: 500 W Panel Heater draws 500 W = 0.5 kWh per hour.
- Daily use: 0.5 kWh × 3 h = 1.50 kWh/day.
- Daily cost: 1.50 kWh × 26.11p = 39.2p.
- Weekly (2 days): 39.2p × 2 = 78.3p.
- Annual: 78.3p × 52 = £40.73.
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500 W wattage from Energy Saving Trust — Heating your home guide (typical appliance ratings) (typical/indicative). Unit rate 26.11p/kWh from Ofgem — Energy price cap unit rates and standing charges (1 July to 30 September 2026), OGL v3.0.