3 kW Convector Heater running cost — 6 h daytime (home-worker)
A 3 kW Convector Heater (3,000 W) running 6 hours/day uses 18.00 kWh and costs £4.70/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
3 kW Convector Heater — 6 h daytime (home-worker): 3,000 W ÷ 1000 × 6 h × 26.11p/kWh = £4.70/day. Weekly (5 days): £23.50. Annual: £1221.95. Coverage: Large living room or open-plan space (~30 m²). Source: Energy Saving Trust (wattage, typical/indicative); Ofgem (OGL v3.0).
- Per hour
- 78.3p
- Per day (6 h)
- £4.70
- Per week (5 days)
- £23.50
- Per year
- £1221.95
Heater specification
- Rated power
- 3,000 W (3.0 kWh/h)
- Coverage
- Large living room or open-plan space (~30 m²)
- Cost per kWh (Ofgem cap)
- 26.11p
- Cost per hour
- 78.3p
Energy Saving Trust — typical 3 kW convector heater rating
How the cost is worked out
- Wattage: 3 kW Convector Heater draws 3,000 W = 3.0 kWh per hour.
- Daily use: 3.0 kWh × 6 h = 18.00 kWh/day.
- Daily cost: 18.00 kWh × 26.11p = £4.70.
- Weekly (5 days): £4.70 × 5 = £23.50.
- Annual: £23.50 × 52 = £1221.95.
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3,000 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.