How Much Does a Oil-Filled Radiator 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 oil-filled radiator usually costs less to run than a fan heater of the same wattage because the thermostat cycles the element on and off once the room warms up.
Calculator24.5p/kWh
W
hrs
p/kWh
Per hour
29.4p
Per day
£1.18
Per week
£8.23
Per month
£35.80
Annual cost
£429.24
Typical annual electricity use: 1752.00 kWh
Based on typical oil-filled radiator usage at current rates.
Annual estimate
£429.24
Annual electricity use
1752.00 kWh
Typical household bill context
About 65% of a typical home's annual variable electricity spend at the current default rate.
What Affects the Cost of Running a Oil-Filled Radiator?
The key difference is thermostat cycling. The radiator may be rated at 2,000W, but it does not draw that power constantly throughout the full session once it reaches temperature.
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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 Oil-Filled Radiator Running Costs
Warm the room steadily and avoid overheating. A timer and sensible thermostat setting usually save more than switching the appliance on and off repeatedly by hand.