Typical space heater wattage
Most full-size portable electric heaters sold for a standard U.S. household outlet are rated up to 1,500 watts. Many models also offer a lower setting near 750 watts. The heater's label is the best source for its actual input power.
Example cost at 17¢ per kWh
A 1,500-watt heater running for five hours uses 7.5 kWh. At 17¢ per kWh, that is about $1.28 per day, $38.25 over 30 days, or $465.38 if repeated every day for a year.
Why the real cost can differ
A thermostat may cycle the heating element off after the room reaches its target temperature. Drafts, insulation, room size, outdoor temperature, and the chosen heat setting all affect actual operating time. Fixed charges and taxes on a utility bill are not included.
Ways to reduce heater cost
- Heat the occupied room instead of unused space.
- Seal drafts around doors and windows.
- Use the thermostat rather than running continuously.
- Keep flammable materials clear and follow the manufacturer's safety instructions.
Space heater FAQ
Does a 1,500W heater always use 1,500 watts?
It draws about that amount while the heating element is fully on. Thermostat cycling can lower average use.
Is low heat exactly half the cost?
If the low setting draws 750 watts for the same number of hours, the energy charge is roughly half. Fan and control power are comparatively small.
Is electric resistance heat efficient?
Nearly all electricity entering a resistance heater becomes heat in the room, but electricity may still be more expensive than a heat pump for the same delivered heat.