Is it safe to leave electric heater unattended?

Author: Marlee Williamson  |  Last update: Saturday, January 31, 2026

Never leave a space heater unattended. Turn it off when you're leaving a room or going to sleep, and don't let pets or children play too close to a space heater.

Is it safe to leave an electric heater on when not home?

An electric heater is safest to leave unattended provided you are not dangling something flammable close in front of it or around it for that matter.

What is the safest electric heater to leave unattended?

The Safest Space Heaters
  • DeLonghi Dragon Digital Full-Room Radiant Heater.
  • Lasko Ceramic Bathroom Heater.
  • Vornadobaby Tempa Nursery Heater.

Can an electric heater give off carbon monoxide?

No. Only heaters that burn a combustible fuel to create heat can cause carbon monoxide build-up in your home. An electrical heater works by having electricity flow through a metal heating or ceramic heating element to produce heat.

What are the safety precautions for electric heaters?

Always use a smoke alarm/carbon monoxide alarm whenever using a space heater. Turn off portable heaters whenever leaving the room or going to bed. Keep anything that can burn at least three feet away from heating equipment. The three-foot safety zone includes furniture, drapes, and electronics – anything that can burn.

Is It Safe to Leave Electric Space Heater ON Overnight?

Is my electric heater safe?

Electrical heaters can be a great way to keep warm – especially if you only want to warm up one room. However, they should be used with care. Our figures show on average there are over 160 fires a year. Tragically, a third of electrical fires that resulted in a fatality involved heaters.

Do electric heaters need ventilation?

There's no combustion process involved, and therefore, no need to vent any exhaust gases. Electric water heaters are self-contained units that need to be connected to a power source, making the installation process more straightforward and eliminating the need for complex venting systems.

Is it safe to sleep with an electric heater on?

Fires are one of the biggest risks associated with leaving electric heaters on all night. If an electric heater has frayed wiring or malfunctions, then there is a high chance of it igniting. Electric heaters also make the air in the room really dry by conducting a lot of heat.

How do I know if my heater is releasing carbon monoxide?

The soot stain can have a black, brown or even yellow color. Smell: While carbon monoxide doesn't emit odor, it may get accompanied by other exhaust gases that produce an odor. A yellow burner flame: The pilot flame may produce an unusual yellow flame instead of the normal blue one.

Can electric heaters cause health problems?

Room heaters can cause dryness in the air, which can result in dry skin, dry eyes, and dry throat. This can further lead to respiratory issues, nasal congestion, and increased susceptibility to infections.

How long can you safely run an electric heater?

The duration for which you can leave a space heater running depends on the time of day and your specific needs. During the Day: It's safe to leave your heater on for 6-8 hours if you're in the room. If you're busy or moving between rooms, consider using a timer to automatically shut it off after a few hours.

What is the safe distance from a heater?

Keep heaters at least 3 feet away from anything that can burn, including upholstered furniture, bedding, curtains, clothing, insulation, cardboard and papers. Never leave heaters on when unattended. Turn heaters off, unplug electric heaters, and turn off portable propane cylinders when leaving the area.

Can I leave my heater on when I leave the house?

You don't need to leave your heating on full blast through the winter months while your home is unoccupied. Adjust your thermostat to at least 12.5°C for as long as your home is unoccupied. This will keep your system running and help prevent your pipes from freezing.

What kind of heater is safe to leave unattended?

The good news is that modern infrared heaters are very safe to use even when left unattended during the night, even while you are sleeping.

What happens if you leave an electric heater on for too long?

It's a Fire Hazard

Leaving your electric heater on all day is also a fire hazard. If you are not home to monitor the heater, it could overheat and start a fire.

Should I turn off electric heater?

Turn off your heaters before going to bed and when you're leaving the house. Many appliances continue to draw stand-by power even when switched off. This can account for up to 3% of your total energy costs. Turn off appliances not in use (such as TVs, computers and consoles) at the power point.

Can an electric heater cause carbon monoxide poisoning?

Appliances that run on electricity do not produce carbon monoxide. CO can build up indoors and poison people and animals.

What are two warning signs of carbon monoxide poisoning?

The most common symptoms of CO poisoning are headache, dizziness, weakness, upset stomach, vomiting, chest pain, and confusion. CO symptoms are often described as “flu-like.” If you breathe in a lot of CO, it can make you pass out or kill you.

How do you know if your heater is leaking gas?

Hissing sound: The release of gas from the intake line or valve may create a very small hissing sound. Or, in the case of a large leak, it may be very audible. While there can be other causes of a hissing sound, you should take the possibility of a gas leak seriously because it is a large safety issue.

Can I leave an electric heater on overnight?

It is not advisable to leave electric radiators switched on overnight.

Can you use an electric heater in a closed room?

Turn off the space heater when no one is occupying that area or when it is out of sight. Do not use space heaters if small children are in the area. Unplug space heaters at the end of each day and make sure the unit has cooled before exiting the room or jobsite.

Are electric heaters safe?

Unfortunately, they can pose significant fire and electric shock hazards if not used properly. Fire and electrical hazards can be caused by space heaters without adequate safety features, space heaters placed near combustibles, or space heaters that are improperly plugged in.

Are electric heaters safe to breathe?

Improperly vented (and unvented), blocked, separated, rusted, or corroded small space heaters may emit dangerous levels of carbon monoxide (CO) and other gases into the home, causing sickness and death.

Are electric heaters safe to run all the time?

Electric heaters of any type are unsafe to leave running overnight because they carry a significant amount of risk.

Previous article
Is it better to run AC with a dirty filter or no filter?
Next article
Can I paint wood to make it waterproof?