3 kW Convector Heater running cost — 5 h shoulder season
A 3 kW Convector Heater (3,000 W) running 5 hours/day uses 15.00 kWh and costs £3.92/day at the Ofgem cap of 26.11p/kWh (1 July to 30 September 2026).
3 kW Convector Heater — 5 h shoulder season: 3,000 W ÷ 1000 × 5 h × 26.11p/kWh = £3.92/day. Weekly (5 days): £19.58. Annual: £1018.29. 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 (5 h)
- £3.92
- Per week (5 days)
- £19.58
- Per year
- £1018.29
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 × 5 h = 15.00 kWh/day.
- Daily cost: 15.00 kWh × 26.11p = £3.92.
- Weekly (5 days): £3.92 × 5 = £19.58.
- Annual: £19.58 × 52 = £1018.29.
Reduce your heating costs
A professional boiler service, draught proofing, or loft insulation can cut your home heating bill significantly. GeraHome connects you with trusted, vetted heating engineers.
Find a heating engineerSame usage — other heater types
Track heating costs
Updated each time the Ofgem cap changes.
No spam. Unsubscribe anytime. A Gera Services product.
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.