Space heater safety comes down to a few rules: keep the heater at least 3 feet from anything that can burn, plug it straight into a wall outlet, choose one that shuts off if it tips over, and turn it off when you leave the room or go to sleep. NFPA says simple precautions prevent most heating fires.
Space heaters are handy for warming one chilly room, but they carry an outsized share of the risk. According to NFPA, space heaters and heating stoves were involved in nearly a third (30%) of home heating equipment fires from 2020 to 2024, yet they accounted for 73% of the deaths and 70% of the injuries from those fires.
The U.S. Fire Administration (USFA) found a similar pattern for portable heaters alone: about 3% of home heating fires from 2017 to 2019, but 41% of fatal home heating fires. NFPA also notes that nearly half of home heating equipment fires (46%) happen from December through February, so winter is when these rules matter most.
Give it 3 feet of space. NFPA says to keep a heater at least 3 feet (1 meter) away from anything that can burn, including people. CPSC names drapes, furniture and bedding as things to keep clear.
Make a kid-free zone. NFPA recommends a 3-foot "kid-free zone" around space heaters and open fires. Keep children away from the heater.
Plug it into the wall. Plug the heater directly into a wall outlet. NFPA says never to use an extension cord, and CPSC says to use the wall outlet rather than an extension cord or power strip.
Turn it off when you leave or sleep. NFPA and USFA both say to turn space heaters off when you leave the room or go to bed. NFPA adds that you should unplug them too. CPSC says not to leave one running while you sleep.
Set it on solid ground. Place the heater on a solid, flat surface (NFPA).
Keep paths clear. Keep heaters out of foot traffic, and never block an exit (NFPA).
Never use the oven for heat. NFPA and USFA both say never to use your oven to heat your home.
NFPA's portable heater checklist lists the features to look for when you buy:
The seal of a qualified testing laboratory on the heater.
A thermostat and overheat protection.
An automatic shut-off that turns the heater off if it tips over.
NFPA describes several types of electric space heaters: oil or water-filled radiators, fan-forced heaters that blow warm air over metal coils, ceramic heaters, and infrared heaters that use infrared bulbs. Whatever the type, the same clearance, outlet and shut-off rules apply.
Heaters that burn kerosene, propane, gas or wood add two more risks: fuel fires and carbon monoxide (CO), a poisonous gas you can't see or smell. These tips come from NFPA and CPSC:
Use only the kind of fuel the manufacturer specifies (NFPA).
Turn off a fuel-burning heater and let it cool before refueling (CPSC).
All fuel-burning equipment should be vented to the outside to avoid CO poisoning (NFPA).
Have a qualified professional install stationary space heating equipment, following local codes and the manufacturer's instructions (NFPA).
Have heating equipment and chimneys cleaned and inspected every year by a professional (NFPA, USFA).
Install CO alarms on every level of the home and outside sleeping areas, and test them monthly (CPSC).
Our sister site has a guide to carbon monoxide detector placement if you're adding alarms this winter.
CPSC warns that heaters can cause overheating, especially in children, people with disabilities and older adults. It advises against leaving a heater running unattended near infants or anyone who may not be able to respond. If you're setting up a heater in an aging parent's room, check that it sits 3 feet from the bed and curtains, that the cord reaches a wall outlet without an extension cord, and that the heater has tip-over shut-off.
Smoke alarms matter here too. CPSC recommends smoke alarms on every level of the home and inside each bedroom, tested monthly.
Fire or smoke: if a heater or anything near it catches fire, get everyone out, stay out, and call 911 from outside.
Gas smell: NFPA says if you smell gas in your gas heater, don't light it. Leave the home right away and call your local fire department or gas company.
No. NFPA says to turn space heaters off and unplug them when you go to bed, and CPSC says not to leave a space heater running while you sleep.
No. CPSC says to always plug electric space heaters directly into a wall outlet, not a power strip or extension cord. NFPA also says never to use an extension cord.
At least 3 feet. NFPA applies the 3-foot rule to anything that can burn, including people, and CPSC names drapes, furniture and bedding.
NFPA recommends a heater with the seal of a qualified testing laboratory, a thermostat, overheat protection and an automatic shut-off if it tips over.
RoomMend: Safer Home Plans is a free iPhone and iPad app, with an optional RoomMend Plus upgrade, that sets up a room-by-room safety checklist for your home or a parent's. If you spot a heater too close to the curtains, you can log it in about three taps with an optional photo and a timeframe, then mark it fixed and get a reminder to look again after 30 days. It needs no account, has no ads and works offline, but it is not a safety certification, so the rules above still come first.
Get RoomMend free on the App Store