Electric baseboard heaters: placement, circuits and safety

Where baseboards make sense

Electric baseboard heaters are simple. A resistance element warms the air around it, the warm air rises, and cooler air is drawn in at the bottom. There is no fan, no ductwork and nothing to maintain beyond keeping it clean.

In Edmonton, baseboards are common in basement suites, additions, cabins, older condos and rooms that a forced-air system never quite reaches. They also make sense for zoning: each room has its own thermostat, so you only heat the rooms you use.

Baseboards are also quiet and responsive. They heat up within minutes, they do not blow dust around, and a failed heater only affects one room. For rental suites, separate room control can also make it easier to share heating costs fairly when the suite is on its own meter.

They are not usually the cheapest way to heat a whole house in Alberta, where natural gas is common. For a single room, a suite or a cold corner, they are often the easiest and most practical choice.

Placement in the room

The classic spot for a baseboard is on an exterior wall, under a window. Warm air rising from the heater meets cold air falling off the glass, which cuts drafts and keeps the window warmer and drier.

• Mount the thermostat on an inside wall, away from the heater, windows, doors and direct sun, so it reads true room temperature.
• Do not put a heater under a wall receptacle. Cords hanging over a hot heater can be damaged. The Canadian Electrical Code has rules on this, and your electrician will lay out receptacles and heaters to suit.
• Leave the space in front of the heater open. Beds, sofas and storage boxes block airflow and can overheat.

In basements, heat loss is greatest along the rim joist and at windows. Placing heaters there gives more even comfort than putting one big heater on an inside wall.

Sizing: let the numbers decide

Rules of thumb for watts per square metre are easy to find online, but they are rough. Real heat loss depends on insulation, windows, ceiling height, air leakage and how exposed the room is. A finished basement in a new home loses heat very differently from a 1960s bungalow addition with single-pane windows.

A heat loss calculation looks at each wall, window and ceiling to work out how much heat the room needs at the coldest design temperature for Edmonton. Heaters are then chosen to match, with the load split across walls.

Bring what you know about the room to the conversation: the age of the windows, whether the walls are insulated, which way the room faces and whether it sits over a garage or a crawl space. Rooms over garages and cantilevers are notoriously cold in Edmonton and often need more heat than their size suggests.

Oversizing wastes panel capacity. Undersizing leaves you cold on the worst nights. A short design step avoids both.

Circuits and panel capacity

Most permanent baseboards in Canadian homes run on 240 V. A typical circuit runs from a two-pole breaker to a line-voltage thermostat and then to one or more heaters.

Fixed electric heat is treated as a continuous load, so circuits are sized with headroom. The thermostat also has a maximum load rating. Your electrician will total the wattage on each circuit and thermostat and keep it within both.

Adding several heaters can push an older 60 A or 100 A service close to its limit, especially in homes that also have an electric range, dryer and hot tub. A load calculation shows whether the service can handle the new heat or needs a service upgrade.

Safety and clearances

• Keep curtains, bedding, clothes and paper off and away from the heater. Check the clearance on the heater label.
• Vacuum dust and pet hair from the fins each fall with the heater switched off and cool.
• Never dry clothes or boots on a baseboard.
• Watch for a burning smell that does not go away after the first few uses of the season, scorch marks, or a thermostat that clicks but the heater stays cold.

Thermostats make the difference

Old bimetal dial thermostats on baseboards can swing several degrees above and below the setting. Modern electronic line-voltage thermostats hold temperature more closely, and programmable models can lower the heat at night or while you are at work.

Make sure any thermostat you buy is rated for line voltage and the load of your heaters. A standard low-voltage furnace thermostat will not work and is unsafe on a baseboard circuit. Our guide to line-voltage thermostats covers the options.

Smart line-voltage thermostats can also report temperature to your phone, which is handy for checking a cabin or rental suite during a cold snap. Some need a neutral wire at the thermostat box, which older installations may not have, so check before you buy.

If you are finishing a basement or adding a suite, baseboards are often designed together with lighting and receptacles. Our electric baseboard heating team can design, permit and install the whole system.

Common questions