Heating Costs
Electric Heater Running Cost Calculator
Portable resistive heaters are straightforward to estimate when they are drawing their full rated power. Thermostats can reduce average consumption once a room reaches temperature.
Use the power for your appliance and the time it actually runs. This estimates a continuous draw; use measured kWh when you have it.
Cost per hour£0.53
Cost per session£2.11
Energy per session8.00 kWh
Weekly£14.74
Monthly£63.87
Annual£766.44
Formula: watts ÷ 1,000 × hours × electricity rate. The rate is in pence, and results are shown in pounds. Monthly = weekly × 52 ÷ 12; annual = weekly × 52. Standing charges are excluded.
What the result means
- A thermostat may cycle the heater on and off, reducing real energy use below the maximum estimate.
- This calculator does not compare whole-home heating systems or recommend electrical work.
- Never exceed the manufacturer's installation and safety instructions.
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