The one-metre rule for portable heaters that could stop a fire

The heating’s off, the room’s cold, and that little heater in the corner is doing a lot of work for not much money. But when did you last check the cable? Or look at what’s sitting a few feet in front of it?

With energy prices still climbing and temperatures dropping across the UK, more of us are reaching for portable heaters to warm one room instead of the whole house. Health and safety training company High Speed Training has put together some practical safety tips on getting the warmth without the risk.

Dr Richard Anderson, Learning Experience Director at High Speed Training, said: “Portable heaters are a brilliant way to heat specific spaces without running central heating through the entire house. However, like any appliance that generates high levels of heat, they aren’t without risk. Taking just a few moments to inspect your heater and position it correctly can make all the difference in keeping your household safe.”

Check it over before you switch it on

Before you plug in any portable heater, give it a proper look for visible wear, damaged cables or cracking.

• Oil-filled heaters: make sure there are no signs of leaking fluid.
• Battery-powered heaters: if it runs on a lithium-ion battery, inspect the pack carefully for any swelling or damage.
• Safety marks: always confirm the product carries an official safety mark, such as CE or UKCA, before you use it.

How the one-metre rule works

Where the heater sits matters as much as what it is. “Positioning is one of the most critical factors in preventing accidental fires,” Richard said.

Put it on a hard, level floor that won’t burn. Never rest a portable unit on a bed, sofa, table or thick rug, where it can tip over or have its airflow blocked.

Then keep a clear gap of at least three feet (one metre) between the heater and anything that can catch fire. That includes curtains, bedding, rugs and upholstered furniture.

“Fan heaters and exposed-element quartz heaters can heat nearby fabrics to ignition point remarkably fast,” Richard said. “It is equally vital never to drape wet laundry directly over a heater to dry, as this traps extreme heat inside the unit and creates an immediate fire hazard. Finally, ensure heaters are situated well away from doorways and escape routes in case of an emergency.”

What to do every time you use it

• Skip the extension lead. Extension cords can overheat and become a fire hazard. Plug the heater straight into the wall.
• Don’t leave it running unattended. Switch it off and unplug it before you go to bed or leave the house.
• Let it cool before you move it. Never lift, adjust or move a heater while it’s on or still hot.

“Portable heaters naturally become very hot to the touch, and units with exposed elements pose an immediate contact-burn hazard,” Richard said. “Keep children and pets closely supervised whenever a heater is running, and avoid sitting or standing directly against the heat source.”

Gas heaters and bathrooms need extra care

Bottled gas heaters bring a different danger. Burning the fuel in an enclosed living space produces carbon monoxide.

“If you use a gas heater, remember that burning bottled fuel in an enclosed living space produces carbon monoxide, a colourless, odourless, and lethal gas,” Richard said. “Never operate gas heaters in poorly ventilated rooms, and ensure you have working carbon monoxide alarms fitted nearby. Furthermore, avoid using standard electric heaters in damp environments such as bathrooms, opting only for units specifically certified for high-moisture areas.”

The full portable heater safety guide sits on the High Speed Training Hub, alongside more of its safety advice.