Fire Hazards Running a space heater overnight increases the risk of fire. If the unit is left unattended or placed too close to flammable materials, such as curtains or bedding, it can ignite and lead to a devastating fire.
If a space heater falls over or becomes too hot from running for too long of a period of time, that can lead to a fast-moving fire that occurs while you are asleep and cannot act fast enough. We do not recommend using space heaters at all because of this risk, but you definitely should not use them at night.
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.
Absolutely. The US Department of Energy records about 25,000 house fires every year that are linked to a space heater fire. Many result in trips to the emergency room, with more than 300 fatalities each year. Property damage from these fires can be devastating, requiring extensive professional fire damage restoration.
Always turn off the heater when you leave the room. Extended use of heaters can make them break down internally, and they could catch fire. Plus, you waste energy when the space heater is keeping an empty room warm. To be on the safe side, look for a space heater that has automatic shutoff features.
Running a space heater overnight increases the risk of fire. If the unit is left unattended or placed too close to flammable materials, such as curtains or bedding, it can ignite and lead to a devastating fire.
Overusing the heater or using an oversized heater can result in elevated levels of carbon monoxide or nitrogen dioxide fumes in the air. These fumes can cause cold or flu-like symptoms, headaches, and eye, nose and throat irritation.
Portable heaters can cause fires if they are placed too close to combustible materials, such as drapes, furniture or bedding, so make sure to place them at least three feet away from these materials.
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.
One of the most common ways a space heater can cause a fire is by tipping over. Other ways are overheating, or being placed too close to flammable items like curtains. Portable space heaters can get very hot and ignite nearby objects, by either tipping over or being in close proximity to these objects.
Sealed combustion heaters are much safer to operate than other types of space heaters, and operate more efficiently because they do not draw in the heated air from the room and exhaust it to the outdoors. They are also less likely to backdraft and adversely affect indoor air quality.
Most home heating deaths happened because a space heater was too close to furniture, clothing, mattresses, or bedding. Make sure your heater is at least three feet from anything that can burn.
Space heaters must have an automatic safety switch (tip-over switch) that turns the unit off if it is tipped over. Space heaters must have a thermostatic control which ensures that the unit will turn itself off and pre vent overheating or creating an electrical hazard.
Space heaters can take anywhere from 750 watts to 3,000 watts to operate. Large space heaters take immense amounts of energy to run. However, those are most likely used only in commercial and industrial settings. The average residential space heater has two main heat settings, low and high.
Electric blankets should never be left unattended when turned on. But, can you leave an electric blanket on all night? We don't recommend sleeping with an electric blanket on all night and a thermostatic control or timer should be used if you choose to leave your electric blanket on.
Is it safe to leave a space heater on overnight? While there is much debate about this topic, the general, expert consensus is a resounding “no” — and you should never leave it running overnight. “No, it's absolutely not safe to use a space heater at night,” states Glenn Gault, CEO at Gault Heating & Cooling.
Leaving your heating on all night may keep you warm, but it will also cause an increase in your energy bills. The best way to save money and energy is by only using your heating when you need it.
Just ensure you're not leaving it unattended for too long, especially if you're moving to another area of the house. When You're Away: It's best to turn off your space heater completely if you'll be away for more than 30 minutes to 1 hour.
While electric space heaters do not produce carbon monoxide (CO), non-electric space heaters (propane gas, natural gas, kerosene, wood) can if incomplete combustion occurs.
To prevent overheating, never use an extension cord or a power strip with an electric heater. And don't cover the cord with an area rug or furniture, which could cause damage or overheating.
Using a space heater can be a good way to boost the temperature in a small, drafty room—and it could be less expensive than cranking up your central heating system. But a space heater is economical only if you use it judiciously.
Do not plug any other electrical devices into the same outlet as the heater. Place space heaters on level, flat surfaces. Never place heaters on cabinets, tables, furniture, or carpet, which can overheat and start a fire. Always unplug and safely store the heater when it is not in use.