How Much Does It Cost to Run a Space Heater?
Estimate space heater electricity cost from wattage, hours used, days used, and kWh rate.
Last updated: May 2026
Most space heaters are high-watt devices
Many plug-in space heaters draw up to 1,500 watts on high. That can add noticeable cost if the heater runs for several hours every day.
Hours matter most
The same heater can be cheap for short warm-up use and expensive as a primary heat source. Enter realistic hours and days for the room you actually heat.
Use heaters carefully
Follow safety instructions, keep clearance around the heater, avoid damaged cords, and do not use extension cords unless the manufacturer specifically allows it.