How Much Does a Electric Heater Cost to Run?
Updated March 2026. Default rate effective 1 April 2026 (Ofgem Q2 2026). Figures are typical estimates rather than model-specific guarantees.
An electric heater costs approximately £1.96 per day for a 2,000W fan heater running 4 hours, making it one of the most expensive appliances to run. Oil-filled radiators with thermostats cost about 30-40% less.
Calculator24.5p/kWh
W
hrs
p/kWh
Per hour
49.0p
Per day
£1.96
Per week
£13.72
Per month
£59.66
Annual cost
£715.40
Typical annual electricity use: 2920.00 kWh
Based on typical electric heater usage at current rates.
Annual estimate
£715.40
Annual electricity use
2920.00 kWh
Typical household bill context
About 108% of a typical home's annual variable electricity spend at the current default rate.
What Affects the Cost of Running a Electric Heater?
Electric heater costs vary based on: Heater type — fan heaters (no thermostat, full power always) cost approximately £1.96/day, oil-filled radiators (thermostat cycling at 60% duty) cost approximately £1.18/day. Wattage — models range from 500W to 3,000W.
Helpful guides
Related appliances
Assumptions and methodology
- Electricity rate: 24.5p/kWh (Ofgem Q2 2026)
- Default wattage is based on a typical appliance in this category
- Usage assumptions are meant to be a sensible starting point, not a fixed rule
- Costs vary with tariff, model, settings, load size, and household habits
Tips to Reduce Electric Heater Running Costs
Use a thermostat-controlled oil-filled radiator rather than a fan heater — it costs 30-40% less to run. Only heat the room you are in rather than the whole house.
Frequently asked questions
Common questions about electricity costs and our calculators.