The short answer
Fire and Burn Risks
Space heaters are a leading cause of home fires during colder months. The heating element gets hot enough to ignite nearby curtains, bedding, or upholstery. Even a small mistake, like placing a heater too close to a couch, can create a serious hazard. Your sensible defense is distance and supervision.
Modern heaters often include tip-over switches and overheat protection. These features help, but they don't make the heater safe to ignore. A child or pet can knock it over, and the surface can still cause burns. Keep the heater on a flat, stable surface and never leave it running in a room you're not in.
Drying Out Your Home's Air
Electric heaters dry the air as they warm it. Over a long night, this can drop indoor humidity noticeably, leading to dry skin, irritated eyes, and a scratchy throat. Wood floors and furniture can also suffer as moisture leaves the air, causing cracks and warping.
Your home's humidity matters, especially in a climate with wet winters and dry summers, like the Pacific Northwest. If you run a heater overnight, consider using a humidifier in the same room. You can also place a bowl of water near the heater, though that only adds a small amount of moisture.
- Keep the heater at least three feet from anything flammable
- Place it on a hard, non-slip surface, never on carpet or a rug
- Use a heater with an automatic shutoff and tip-over switch
- Turn it off before you fall asleep or leave the room
- Check the cord and plug for damage before each use
- Never use an extension cord with a space heater
Carbon Monoxide and Other Fumes
Fuel-burning heaters, like kerosene or propane models, produce carbon monoxide, a colorless, odorless gas that can be deadly. These heaters need proper ventilation and a working carbon monoxide detector. If you use one, never leave it on all night, even with a window cracked.
Electric heaters don't produce carbon monoxide, but they can still create a fire risk. If you wake up with a headache, nausea, or dizziness, get fresh air immediately and see a doctor if you feel unwell. Check that your carbon monoxide detector works, and replace the batteries if needed.
Safer Overnight Heating Options
Instead of running a space heater all night, consider using a heated blanket or mattress pad, which warm you directly without heating the whole room. These use less energy and pose a lower fire risk when used according to the instructions. Set the thermostat on your central heating to a lower temperature, like 60 degrees, to keep the house from freezing while you sleep.
If you do use a space heater, choose one with a thermostat that cycles on and off. Set it to a comfortable temperature, not the highest setting. Use the timer function if your model has one, so it turns off after a few hours. This limits the time it runs and reduces the risk.
What to Do After a Water Incident
Sometimes a heater is used to dry out a damp area after a leak or flood. That can be risky, as water and electricity don't mix. If your home has suffered water damage, don't rely on space heaters to dry things out. They can overheat or cause electrical shocks if they get wet.
Water damage pros use specialized drying and dehumidification equipment to remove moisture safely. If you're dealing with a leak or flood, the pros can assess the situation and set up the right tools. You can also use a dehumidifier on its own to help dry the air, but keep it away from standing water.
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Call Now (425) 407-5186Frequently asked questions
Can a space heater catch fire if left on all night?
Yes, it can. The heating element can ignite nearby materials, and older or faulty units are more prone to failure. Always keep the heater clear of flammables, use a model with safety shutoffs, and consider turning it off when you sleep.
Is it cheaper to run a space heater overnight?
It depends on your home's heating system and the size of the space. Space heaters can be efficient for warming a single room, but they use a lot of electricity. If your central heating is gas, a space heater might be more expensive. Check your energy costs and compare.
What should I do if my heater smells like burning?
Unplug it immediately. A burning smell can mean dust on the element, which usually burns off, or it could be a sign of a short circuit or overheating. Let it cool, inspect the cord and plug, and if the smell persists, don't use it. Consider a newer model.