Smart devices · 5 min read · updated oct 2026
Electric Baseboard Heater Thermostats in Canada: How to Choose
By the Pixl Canada install team
Quick answer
A thermostat for electric baseboard heaters is a line-voltage thermostat, which switches 120 V or 240 V power directly. To choose one, match your supply voltage, make sure its wattage rating covers every heater on it, and decide between single-pole and double-pole. Smart baseboard thermostats such as Mysa need at least four wires in the box. Because the job involves mains voltage, manufacturers such as Stelpro say a certified electrician should install it.
Send us photos of your thermostat wiring and heater labels and ask what we can do for your home. You pay after the job. Contact Pixl
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Is your thermostat line voltage?
Most furnace thermostats are low voltage (24 V) with thin wires on screw terminals. Baseboard thermostats are different.
| Sign | Low-voltage (24 V) | Line voltage (120 V or 240 V) |
|---|---|---|
| Wires | Thin, in several colours, on labelled terminals such as R, W, Y, G and C | Two to four thick wires, often joined with wire nuts |
| Label | Little or no voltage marking | 120 V, 240 V or a wattage rating on the thermostat |
| Controls | A furnace, air conditioner or heat pump | Electric baseboards, convectors or fan heaters |
| Breaker | Not applicable | A 240 V circuit uses a double-pole breaker in the panel |
If yours is low voltage, read thermostat wiring explained instead. If it is line voltage, the rest of this guide applies.
How to choose a baseboard thermostat
- Match the voltage. Check whether your heaters run on 120 V or 240 V. Some thermostats cover both, such as the Stelpro ST202NP, rated for 120 to 240 V.
- Add up the wattage. The thermostat’s rating must cover the total wattage of the heaters it controls. The wattage is printed on each heater’s label. Stelpro’s ST202NP lists 300 to 2000 W at 240 V, and its ST302NP handles up to 3000 W.
- Check the pole type. A double-pole thermostat has a true OFF position, while a single-pole model is usually marked LOW or MIN. The technical reference on line-voltage thermostats notes that 240 V loads are common and that only a double-pole model has an OFF position.
- Decide how smart you want it. A basic mechanical or electronic model keeps the settings on the wall. A smart WiFi model adds an app and schedules.
- Check the wires in the wall. A smart model needs a constant power path. Mysa says its baseboard thermostat needs four or more wires in the box, and that with only two wires a thermostat can only break the circuit and cannot power a smart thermostat.
Sources: Stelpro’s ST202NP installation guide, BCcampus’s line-voltage thermostat chapter and Mysa’s compatibility guide.
Types of baseboard thermostats
| Type | Good for | Watch out for |
|---|---|---|
| Mechanical (dial) | A simple, low-cost swap | Wider temperature swings and no schedules |
| Electronic (programmable) | More even temperatures and schedules without WiFi | Check the voltage and wattage rating |
| Smart (WiFi) | Remote control, schedules and energy reports | Needs enough wires and, for some models, a WiFi signal where it is mounted |
Send us photos of your thermostat wiring and heater labels and ask what we can do for your home. You pay after the job.
Limits of a smart baseboard thermostat
Mysa’s compatibility guide gives a limit of 16 amps, which is 1,900 W at 120 V or 3,800 W at 240 V, and says heaters above that are not compatible. It also lists heaters that do not work with its baseboard model:
- Hydronic (water-based) baseboards.
- Gas heaters.
- Three-phase or commercial 208 V systems.
- Heaters with built-in controls.
Mysa also says its thermostat is single-pole, so it switches only one leg and the other leg stays energized when the heater is off. Where local code or the building layout requires a double-pole device, ask a licensed electrician before buying.
Safety and code
- Use a licensed electrician where required. Stelpro’s manuals say the thermostat must be installed by a certified electrician.
- Turn the power off at the breaker and test. Confirm the circuit is dead before touching a wire.
- Never use a thermostat as a disconnect. Stelpro warns not to use a thermostat as the disconnecting means before working on a baseboard heater.
- Keep clearance around it. Stelpro asks for at least 12 inches (30 cm) around the ST202NP so it can ventilate.
- Do not mix up the wires. On a 240 V circuit both conductors are live, so a white wire is not automatically a neutral.
What to photograph before you buy
- The label on each heater, showing voltage and wattage.
- The wiring in the thermostat box, with the cover off and the power off.
- The breaker for that circuit, to show whether it is single-pole or double-pole.
- The existing thermostat, front and back.
Mysa’s support team will review photos of the wiring and the heater rating plate before you buy. A clear set of photos also helps any electrician quote the job.
Ask us before you book
Pixl Canada lists smart thermostat installation at $129 before tax, with a C-wire adapter at $50 when required. Baseboard thermostats are line voltage and involve mains power, so send us photos and ask what we can do for your home before you book. See smart home installation, the thermostat installation guide and the C wire guide.
Frequently asked questions
Can I use a smart thermostat on electric baseboard heaters?
Yes, but it must be a line-voltage model made for baseboards, such as Mysa or a Stelpro smart model. A normal 24 V smart thermostat cannot control baseboards.
How do I know if my baseboard thermostat is 120 V or 240 V?
Check the label on the heater and the thermostat, and look at the breaker. A double-pole breaker usually means a 240 V circuit. If you are unsure, ask an electrician.
How many wires does a smart baseboard thermostat need?
Mysa says four or more wires in the box. With only two wires, a thermostat can only break the circuit and cannot power a smart thermostat.
What is the maximum wattage for a baseboard thermostat?
It depends on the model. Stelpro’s ST202NP lists up to 2000 W at 240 V and its ST302NP handles up to 3000 W, and Mysa’s baseboard model is limited to 3,800 W at 240 V. Always check the rating against the total wattage of your heaters.
Do I need a double-pole thermostat?
A double-pole model has a true OFF position and breaks both legs of a 240 V circuit. Some installations require it, and Mysa’s single-pole design does not meet that requirement, so ask a licensed electrician if you are unsure.
Can I install a baseboard thermostat myself?
Stelpro’s manuals say a certified electrician should install it. The wires carry 120 V or 240 V, so treat it as electrical work.
This guide is general information based on manufacturer manuals checked in October 2026. Electrical rules vary by province, so follow your thermostat’s manual and use a licensed electrician.
Ready to book? Send us photos of your thermostat wiring and heater labels and ask what we can do for your home. You pay after the job.
Written by the Pixl Canada install team: licensed technicians with $5 million liability insurance, installing TVs, security cameras, smart home devices and appliances across Canada.
Keep reading
Thermostat wiring explained
R, W, Y, G, C and O/B
C wire thermostat guide
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How to install a thermostat
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