Cost to Run a Space Heater
A typical 1500W space heater costs about $0.24 per hour to run at average electricity rates ($0.16/kWh). Running it 8 hours daily costs roughly $58 per month. Lower wattage heaters cost less but heat smaller areas. Use the Power Cost Calculator to estimate your exact costs.
Key Takeaways
- Space heater costs depend on wattage and usage time.
- Ceramic heaters with thermostats cycle on/off, reducing average consumption.
- Oil-filled radiators maintain heat longer but take time to warm up.
Explanation
Space heater costs depend on wattage and usage time. Most full-size space heaters are 1500W, while smaller personal heaters range from 200-750W. The formula is: watts × hours × cost per kWh ÷ 1000.
Running a 1500W heater 8 hours daily: 1500 × 8 × $0.16 ÷ 1000 = $1.92/day or about $58/month. A 750W heater costs half as much but heats a smaller area.
Space heaters are best for supplemental heat in occupied rooms, not whole-house heating. Using one to heat just the room you're in, while turning down central heat, can save money.
Infrared heaters warm objects and people directly rather than heating the air, making them more efficient for spot heating in drafty rooms. A 1500W infrared heater and a 1500W ceramic heater draw the same power, but the infrared model delivers perceived warmth faster because you feel radiant heat immediately without waiting for the air temperature to rise.
The 1500W maximum for most plug-in space heaters is not arbitrary—it corresponds to the 12.5-amp draw that keeps the circuit well within a standard 15-amp household breaker's capacity. Plugging a space heater into an extension cord or power strip is a leading cause of house fires because most cords cannot safely handle the sustained 12.5-amp load, causing them to overheat.
Micathermic panel heaters combine radiant and convective heating in a slim, wall-mountable design. They use 1000-1500W but distribute heat more evenly across a room than fan-forced ceramic heaters, which tend to create a hot zone near the unit and leave far corners cold. Their silent operation also makes them suitable for bedrooms where fan noise would be disruptive.
Comparing space heater costs to central heating reveals when each option makes financial sense. Heating an entire house with central gas at $1.00/therm costs roughly $1-2 per hour, while a single 1500W space heater costs $0.24/hour but only heats one room. If you spend most of your time in one or two rooms, turning central heat to 60°F and using a space heater in occupied rooms can cut total heating costs by 20-30%.
Things to Know
- Ceramic heaters with thermostats cycle on/off, reducing average consumption.
- Oil-filled radiators maintain heat longer but take time to warm up.
- Never leave space heaters unattended or running while sleeping.