Home Heating Fire Safety: Space Heaters, Fireplaces and the 3-Foot Rule
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How we wrote this: A plain-English summary of the U.S. Fire Administration (USFA, part of FEMA) heating fire safety page, plus CDC carbon monoxide guidance for fuel-burning heat, checked October 29, 2026.
A space heater under the desk is a home-office classic in winter. It's also a fire risk worth taking seriously.
How common heating fires are
USFA says heating fires have trended down since the early 1980s, but they were still the second leading cause of home fires in 2021. That year, an estimated 32,200 home heating fires caused about 190 deaths, 625 injuries and $442 million in property loss.
USFA's four core rules
- Keep anything that can burn at least 3 feet from heat sources: fireplaces, wood stoves, radiators, space heaters and candles. Think papers, curtains, bedding and that box of printer paper.
- Never use an oven to heat your home.
- Turn space heaters off when you leave the room or go to bed.
- Have heating equipment and chimneys cleaned and inspected every year by a professional.
Fuel-burning heat also means carbon monoxide
Furnaces, fireplaces, wood stoves and gas appliances can produce carbon monoxide (CO). The CDC says to have your heating system, water heater and other fuel-burning appliances serviced every year, have your chimney checked or cleaned yearly, and install CO detectors near sleeping areas. Don't use portable flameless chemical heaters or camp stoves indoors. See our carbon monoxide guide.
A quick home-office check
- Heater on a hard, level surface, with nothing stacked on it or draped over it.
- 3 feet of clear space around it, including under the desk.
- Off when you step away. Use a timer if you tend to forget.
- If the power goes out, don't improvise heat with an oven or grill. Follow winter storm alerts and plan ahead, including backup power for your devices.
Also see surge protectors and holiday decorations safety.