NFPA figures are from its 2011 to 2015 data and vary by report year. Always follow your heater’s manual.
A dusty space heater can smell, work worse and become a fire risk. Here are eight steps to clean one safely.
Table of Contents
Why Cleaning a Space Heater Matters
Dust and lint build up on heating elements, fans and grills. When the heater runs, that dust can burn, which gives off a hot-dust smell, and in a bad case it can catch fire. A clean heater also runs better, since airflow is not blocked. Cleaning takes about 15 minutes.
What You Need
- A dust mask and gloves.
- A soft brush or paintbrush.
- A vacuum with a brush attachment.
- A damp cloth and a dry cloth.
- A screwdriver, if your manual allows opening the housing.
Here is where space heater safety is heading: tip-over switches, overheat shutoffs and tighter standards. New units almost always include them, and many add smart plugs and timers. Heating is shifting toward heat pumps, but space heaters remain the go-to for cold rooms and cold snaps.
8 Steps to Clean a Space Heater
- Gear up. Wear a dust mask, especially if you have allergies.
- Unplug the heater. Do not just switch it off.
- Let it cool. Wait until it is cool to the touch.
- Wipe the outside with a cloth that is damp, not dripping. Never spray water or cleaner onto the heater.
- Vacuum the grills and vents with a brush attachment.
- Open it only if the manual allows. Many heaters are not meant to be opened, and opening one may void the warranty.
- Brush dust off the elements and fan gently, then vacuum again.
- Dry and test. Let it air dry fully, plug it in and run it on low for a few minutes in a safe spot.
Oil-Filled Heaters
Do not open the oil reservoir of an oil-filled heater. Just clean the outside and the vents. If oil leaks, replace the heater.
Safety Check After Cleaning
- Check the cord and plug for cracks, heat marks or loose parts.
- Keep at least three feet of clear space around the heater.
- Plug it straight into the wall, not an extension cord.
- Set it on a level, hard floor.
- Never leave it running while you sleep or leave the house.
How Often to Clean
Once at the start of the season and once mid-season is a good rule, more if you have pets or a dusty room. For a faster routine, see how to keep a space heater clean.
The downside is complacency. The NFPA reported that space heaters caused 43 percent of U.S. home heating fires and 85 percent of heating fire deaths in its 2011 to 2015 data. Dust on a heating element, a worn cord or a heater parked too close to a couch is a bad mix. Expect more fires from old heaters kept going for years and from cheap units with weak safety parts. Cleaning helps, but replace any heater with a damaged cord or a burn smell that does not go away.
Pick Better and Run Smarter
If your heater is old, damaged or too small for the room, replacing it may be smarter than cleaning it. See how to choose the right size space heater, most efficient space heaters and best space heaters for large rooms. To see the power bill, read how much electricity space heaters use.
FAQ
How do you clean inside a space heater?
Unplug it, let it cool, then vacuum the vents and brush the elements, but only open the housing if the manual allows.
Can you use water to clean a space heater?
Only on the outside, with a damp cloth. Never spray water onto the heater.
Why does a space heater smell like burning dust?
Dust on the element is burning off. Clean it, and replace it if the smell persists.
How often should you clean a space heater?
At least once a season, more in dusty homes.
Final Word
Unplug, cool, dust and inspect. Replace a heater with a bad cord or a persistent burning smell.
What comes next: smarter shutoffs and more energy limits. The routine is still simple. Unplug, cool, dust and look it over once a season.
Related Guides
Keep going with how to keep a space heater clean, how to choose the right size space heater, how much electricity space heaters use, most efficient space heaters and best space heaters for large rooms.
