Space Heater Safety: Three Feet, One Outlet, Off at Night
A small heater warms the room you sit in. Used carelessly, it is also one of the riskiest things in a house. The rules are short.
Why a small heater deserves care
Portable heaters are a small part of home heating, and a large part of the harm. The U.S. Fire Administration puts the two numbers side by side:
Home portable heater fires were only 3% of all home heating fires annually for 2017-2019, but they accounted for 41% of fatal heating fires in homes.
U.S. Fire Administration, Heating Fire Safety. Read 29 September 2026.
Three feet of clear space
Bedding, curtains, a pile of laundry, a stack of mail: all of it counts. The rule applies to every heat source in the house, not only heaters:
Keep anything that can burn at least 3 feet from all heat sources including fireplaces, wood stoves, radiators, space heaters or candles.
U.S. Fire Administration, Heating Fire Safety. Read 29 September 2026.
A wall-outlet heater is handy here, because it sits off the floor and away from blankets. It still needs the same clearance in front of it.
Off when you leave, off when you sleep
A timer helps, but it does not replace the habit.
Turn space heaters off when leaving the room or going to bed.
U.S. Fire Administration, Heating Fire Safety. Read 29 September 2026.
Our heaters with timers switch off on their own after the hours you set. Use that, and still switch the heater off when you walk out of the room.
A wall outlet of its own
Plug a space heater straight into a wall outlet. Extension cords and power strips are not built for the steady load a heater draws, and they run warm. If the heater's plug feels hot, stop using that outlet.
What a small heater can do
- Warm an office, a bathroom or a dorm room.
- Take the chill off the chair where you sit.
- Not heat a whole living room on a very cold night.
- Not replace the furnace.