EZSMART Corporation, ESA/ECRA #7012690 , North York , Ontario
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Every fall we get the same call from Toronto and GTA homeowners: is it okay to run a space heater through an extension cord because the nearest outlet is on the other side of the room? The short answer is no. It is one of the fastest ways to melt an outlet, ignite a cord, and lose a bedroom to fire. This guide explains why, what the Ontario code and Health Canada say, and what to do instead.
No. Health Canada, the Electrical Safety Authority, and every space heater manufacturer we have ever seen warn against it, and for good reason. A 1,500-watt space heater draws around 12.5 amps continuously, which is the rated ceiling for a 15-amp household circuit. Any extension cord in the loop adds resistance, generates heat, and turns a marginally safe setup into a fire waiting to happen. Plug space heaters directly into a wall outlet, on their own circuit if possible.
This is not overcautious code-thumping. It is the reason so many outlets we replace between November and March look like this melted mess.
Three physical realities make the extension cord and the space heater a bad match.
The Electrical Safety Authority’s annual Ontario Electrical Safety Report consistently identifies portable heaters and extension cords as high-risk contributors to residential fires and shock injuries. The Office of the Fire Marshal ranks portable heaters near the top of the winter fire-cause list in Ontario. Every winter it is the same story.
The Ontario Electrical Safety Code treats extension cords as temporary wiring. Using them for a permanent, continuous load like a space heater falls outside that permitted use. Health Canada’s product safety advisories echo the same rule. Manufacturer manuals for name-brand heaters such as Dyson, DeLonghi, Vornado, and Honeywell all include the warning — the language varies slightly, but the meaning is the same: plug directly into a wall outlet.
If a landlord or insurance carrier in Ontario finds that a fire started at a space-heater-and-extension-cord combo, coverage disputes are extremely common. That risk alone is worth the ten-minute alternative below.
Do not plug a space heater into any of these:
The only accessory a space heater should ever touch is the wall receptacle it plugs into.
Almost every extension-cord-and-heater situation we get called about started because the nearest outlet was on the wrong wall. Real fixes, in order of cost:
Adding a dedicated outlet in a finished GTA room is a straightforward job for a licensed contractor. If you are curious what is involved, see how to run electrical wire through finished walls for a homeowner’s-eye view of the process.
Even if you have been running a heater on a cord for years without incident, any of these signs means unplug it right now:
If any of those show up, kill the breaker for the circuit and book an inspection. Reference our full checklist at signs of an electrical fire risk in my home.
If you are running a space heater every winter in the same room, treat it as evidence that room needs a real heating solution, not a nicer extension cord. In our GTA calls, the most common melted outlet scenario is a bedroom with an underpowered baseboard heater plus a 1,500 W plug-in unit on a 15-amp circuit shared with a TV and a phone charger. A dedicated 20-amp circuit with an AFCI/GFCI dual-function breaker solves the fire risk permanently for a fraction of what a fire restoration costs. If you are also thinking bigger picture, a small ductless mini-split is often the same install day and eliminates the need for portable heat entirely.
Ready to move that space heater off an extension cord and onto a proper dedicated circuit in your Toronto or GTA home? Call ezsmart at 416-838-9006 or visit our contact page. An ESA-licensed electrician can add a new receptacle on a dedicated circuit and inspect any suspect outlets while we are there.
Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp
