Should I install a dedicated circuit for a garage heater in Edmundston NB?

Absolutely yes — a dedicated circuit for a garage heater in Edmundston is not just recommended, it is required by the Canadian Electrical Code. Garage heaters draw significant amperage and must have their own circuit with properly sized wire, a correctly rated breaker, and no other loads sharing the circuit. This applies to both electric and gas-fired heaters that have electric ignition and fan motors, though the circuit requirements differ substantially.

Edmundston sits in the upper Saint John River valley in northwestern New Brunswick, one of the coldest regions in the province. Winter temperatures in Edmundston regularly drop to -30 degrees Celsius and below, and the heating season stretches a full six months or longer. If you plan to use your garage as a workshop, store temperature-sensitive items, or simply want to keep your vehicles in a space above freezing, a garage heater is practically a necessity — and it needs to be sized for Edmundston's extreme cold.

For electric garage heaters, the most common options are 240V forced-air unit heaters rated between 4,000 and 7,500 watts. A 5,000-watt heater draws approximately 21 amps at 240V, requiring a 30-amp dedicated circuit with 10-gauge wire. A 7,500-watt unit draws about 31 amps, pushing into 40-amp circuit territory with 8-gauge wire. For a typical two-car garage (24x24) in Edmundston, you will need at least a 5,000-watt heater to maintain above-freezing temperatures, and a 7,500-watt unit to keep the space comfortably warm for workshop use during the coldest months. Undersizing the heater means the unit runs constantly, driving up electricity costs without ever reaching a comfortable temperature.

Natural gas or propane unit heaters are often more economical to operate in Edmundston, where NB Power electricity rates make electric heating expensive for large spaces. A gas-fired unit heater still requires a dedicated electrical circuit, but typically only a 15-amp, 120V circuit for the fan motor and ignition system. The heater itself must be properly vented to the exterior, and the gas line must be sized and installed by a licensed gas fitter. Gas-fired unit heaters in the 30,000 to 75,000 BTU range are the most common choice for residential garages in northern NB, with a 45,000 BTU unit being a solid middle ground for a two-car garage.

Insulation is the prerequisite for any garage heater. Heating an uninsulated garage in Edmundston is like heating the outdoors — the energy cost is enormous and the heater cannot keep up. Before installing a heater, insulate the walls to at least R-20, the ceiling to R-32 or higher, and install an insulated garage door (R-16 minimum). Weatherstrip the service door and seal all gaps around the perimeter. A well-insulated garage in Edmundston can be maintained at 10 to 15 degrees Celsius with a modest heater running intermittently, while an uninsulated garage of the same size would require three times the heating capacity and still feel cold.

Installation costs for a garage heater circuit and unit in Edmundston typically run $1,500 to $3,500 for a complete setup including the heater, dedicated circuit, thermostat, and installation labour. Gas-fired units cost more upfront but less to operate. Your electrician will need to verify that your garage sub-panel (or main panel, for attached garages) has capacity for the heater circuit. If your garage is detached and fed by a 60-amp sub-panel, adding a large electric heater may require upgrading the feeder. Get matched with a local electrician or HVAC contractor through New Brunswick Garages — we can connect you with professionals experienced in garage heating for Edmundston's northern climate.