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The short answer: a standard 120V electric fireplace draws 1,500 watts on high and 750 watts on low, with the flame effect alone using only 10 to 30 watts. That 1,500 watt figure is a hard ceiling set by the circuit, not the design — 12.5 amps at 120V. At the US average residential rate of about 17 cents per kilowatt-hour (EIA), full heat costs roughly 26 cents an hour, low heat about 13 cents, and the flame on its own under half a cent.
We do not physically handle the products we rank; picks come from aggregated owner reviews and expert consensus — see how we rank. Model shortlists are in best electric fireplace.
What does each mode actually cost?
Multiply watts by hours, divide by 1,000, multiply by your rate. The reason it is worth doing per mode is that the three settings differ by two orders of magnitude, so how you use the appliance matters far more than which model you bought. Rates vary widely across the country — the EIA puts state averages roughly between 11 and 33 cents per kilowatt-hour — so check the supply rate on your own bill rather than the national figure if you plan to run heat nightly.
| Mode | Watts | Per hour at 17 c/kWh | 5 hours | Season (4 h/day, 90 days) |
|---|---|---|---|---|
| Flame effect only | 10 – 30 | Under 0.01 | 0.03 | ~1.80 |
| Low heat | 750 | 0.13 | 0.64 | ~46 |
| High heat | 1,500 | 0.26 | 1.28 | ~92 |
| Hardwired 240V unit | 3,000 – 5,000 | 0.51 – 0.85 | 2.55 – 4.25 | 184 – 306 |
Those season figures assume the element runs continuously, which a thermostatic unit will not do. In a correctly sized room expect actual consumption to land 40 to 70 percent of the table figure, because the thermostat cuts the element once the room is at setpoint.
How much heat do 1,500 watts actually produce?
About 5,120 BTU per hour, using the conversion of 3.412 BTU per watt. That is the honest number behind every marketing claim, and it explains why coverage tops out around 400 square feet as a supplement to central heating. Electric resistance heating is essentially 100 percent efficient at the appliance, so there is no efficiency rating to shop on and no model that produces more heat from the same watts. Two 1,500 watt fireplaces from different brands deliver identical warmth; only the flame realism, controls and noise differ.
Coverage detail is in how many square feet does an electric fireplace heat and a reality check on output in do electric fireplaces really heat a room.
What does that draw mean for my wiring?
A 1,500 watt unit pulls 12.5 amps continuously, which is above the 12 amp continuous limit for a 15 amp circuit. In practice that means the fireplace needs a wall receptacle with little else on it, and absolutely no extension cord, power strip or unrated smart plug — a point every manufacturer manual makes explicitly and one the CPSC repeats for all portable heating appliances.
- Plug directly into a wall outlet, ideally on its own circuit.
- Do not share with a microwave, hair dryer, vacuum or a second heater.
- Check the plug temperature after an hour. Warm means a worn receptacle; stop and have it replaced.
- Recessed built-ins often want a dedicated circuit run before the wall closes up.
If the breaker keeps opening, the arithmetic is the same as any resistance heater — see why does my space heater trip the breaker. Running-cost comparison against other heat sources is in do electric fireplaces use a lot of electricity, and the purchase case in are electric fireplaces worth it. More in the heating and cooling hub.