How Much Does A 2kW Heater Cost Per Hour?
Reference table
| Scenario | Power | Use time | Cost at 24.67p/kWh |
|---|---|---|---|
| 30 minutes | 2,000W | 0.50 hours | 24.67p |
| 1 hour | 2,000W | 1 hours | 49.34p |
| 3 hours | 2,000W | 3 hours | £1.48 |
| 6 hours | 2,000W | 6 hours | £2.96 |
What to know
A 2kW heater is one of the clearest examples of why wattage matters: it uses 2 units of electricity every hour it runs continuously.
Practical guidance
Thermostats can reduce real usage if the room reaches temperature, but fan heaters in cold spaces may run close to full power for long periods.
How to use this
For occasional heating in one room it can be useful. For heating several rooms, compare it with central heating rather than judging by unit rate alone.
FAQs
Is 2kW a lot of electricity?
Yes for a portable appliance. It is 2 units per hour if running continuously.
How much is 3 hours?
At 24.67p/kWh, 3 hours costs about £1.48.
Can a thermostat lower the cost?
Yes, if it turns the heater off for part of the hour.
What should I use instead?
For personal warmth, an electric blanket may cost much less.
Last reviewed 3 May 2026. Source: Ofgem energy price cap. Figures are estimates. Actual prices vary by region, supplier, tariff, payment method and meter type.