Can I leave a space heater on while I'm at work?

Author: Ms. Chanelle Champlin Sr.  |  Last update: Wednesday, May 27, 2026

The best way to prevent a fire is to never leave a space heater running in a room unattended—that way, if anything does go wrong, you can take action quickly.

Can I leave the space heater on while at work?

Never Leave Unattended: It's crucial to never leave a space heater unattended while in operation. Turning off the unit when not in use reduces the risk of accidents and contributes to overall workplace safety.

How likely is a space heater to start a fire?

Absolutely. The US Department of Energy records about 25,000 house fires every year that are linked to a space heater fire.

Are space heaters an OSHA violation?

Non-business related small appliances, such as space heaters, are not permitted in the office unless approved by management. Re-locatable power taps (power strips) can be used in conjunction with small appliances if listed and labeled for such use.

Is it safe to leave space heaters on when not home?

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.

Seasonal Safety Tips: Portable Space Heater Safety

How long is too long to leave a space heater on?

During the Day: It's safe to leave your heater on for 6-8 hours if you're in the room.

Is leaving a space heater plugged in a fire hazard?

While electric space heaters can help keep room temperatures warm, they can also be dangerous and cause fires. Space heaters should never be left unattended or used within three feet of any combustibles and should always be plugged directly into an outlet.

What is OSHA rules on heat?

For indoor workplaces, provide access to at least one cool-down area which must be kept at a temperature below 82°F. Shade and cool-down areas must be: Blocked from direct sunlight. Large enough to accommodate the number of workers on rest breaks so they can sit comfortably without touching each other.

Are space heaters a carbon monoxide risk?

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. Don't use these heaters as your main heat source, even during power failures.

Do space heaters use a lot of electricity?

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.

What causes a space heater to catch fire?

Portable electric heaters utilize electricity to power the heating element and warm a space. These heaters are safe to use indoors. However, they should be plugged directly into an outlet. Never plug an electric heater into a power strip, as this can overwhelm the heater and ignite a fire.

Can I leave my electric heater on all day?

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.

How risky are space heaters?

According to the National Fire Protection Association (NFPA), space heaters account for 43% of home heating fires and 85% of home heating deaths. They can also be a hazard in the workplace. While there are no federal safety rules prohibiting space heaters at a worksite, you should follow local rules and regulations.

What are the rules for space heaters?

Space heater safety tips
  • Review instructions and warning labels to ensure safe operation.
  • Inspect your heater for damage.
  • Place space heaters on low, flat surfaces.
  • Keep out of high-traffic areas or doorways.
  • Keep space heaters at least 3 feet away from flammable items and objects, such as papers or curtains.

Should I leave heat on when at work?

Bottom line. Overall, keeping your heat set to 68°F to 70°F during the day, and 7°F to 10°F lower when you're not home, is the best way to save on heating costs.

Is it cheaper to turn up the heat or use a space heater?

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.

Is it safe to leave a space heater on all night?

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.

What does carbon monoxide smell like?

Since CO has no odor, color or taste, it cannot be detected by our senses. This means that dangerous concentrations of the gas can build up indoors and humans have no way to detect the problem until they become ill.

What indoor temperature is an OSHA violation?

According to the new standards, all indoor places of employment where the temperature reaches 82 degrees Fahrenheit or above must comply with regulations around access to water, cool-down areas, acclimatization, training, and more.

What does OSHA forbid employers from doing?

It is illegal for an employer to fire, demote, transfer or otherwise retaliate against a worker who complains to OSHA and uses their legal rights. If you believe you have been retaliated against in any way, file a whistleblower complaint within 30 days of the alleged retaliation.

What is the 80% rule in OSHA?

Question: California regulations set the dosimeter threshold level at 80 dBA for hearing conservation and 90 dBA for compliance.

Can a space heater cause carbon monoxide poisoning?

Carbon monoxide can also be produced if the heater is not properly set up and adjusted for the type of gas used and the altitude at which it is installed. Install a carbon monoxide detector if you use a small space heater.

What is the safest space heater to leave unattended?

Oil filled radiator space heaters are some of the safest on the market. 1500W is all the juice an outlet will provide (Roughly 5,000 btus).

Where should you not put a space heater?

On a carpet, rug or flammable surface

Space heaters can't sit on any surface that can easily scorch or catch on fire. That means you can never place one on a carpet or rug. You should also avoid using them on more delicate hardwoods or meltable vinyl, especially for long periods.

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