An electric heater is a convenient and flexible way to keep your home warm—especially in rooms without central heating. But if the thermostat isn’t working properly, it can affect both your comfort and your electricity bill. A faulty or inaccurate thermostat may cause the heater to run too much or too little. Fortunately, you can test it yourself and, in many cases, fix the problem. Here’s a simple guide for Canadian homeowners on how to check if your electric heater’s thermostat is working as it should.

Understand How the Thermostat Works

The thermostat is the control centre of your electric heater. It measures the room temperature and turns the heating element on or off to maintain the temperature you’ve set. When you set the thermostat to, say, 21°C, it automatically regulates the power to keep the room around that temperature.

There are two main types of thermostats:

• Mechanical thermostats, which use a bimetal strip or gas-filled sensor to control the heat. They’re simple but can become less accurate over time.
• Electronic thermostats, which use digital sensors and often display the temperature on a screen. They’re more precise and respond faster to temperature changes.

Regardless of the type, the thermostat must be able to sense the room temperature accurately to function properly.

Step-by-Step: How to Test the Thermostat

You don’t need special tools to test your thermostat—just a bit of patience and a reliable room thermometer.

1. Set the thermostat Turn the thermostat to a specific temperature, such as 22°C. Make sure the heater is placed so that air can circulate freely around it.

2. Measure the room temperature Place a thermometer in the middle of the room—away from the heater, windows, or direct sunlight. Wait 15–20 minutes, then check the reading.

3. Observe the heater’s response If the room temperature is below the set temperature, the heater should be on. Once the room reaches the desired temperature, it should turn off. You may hear a click when the thermostat switches between on and off.

4. Compare the readings If there’s more than a 2–3°C difference between the set temperature and the actual room temperature, the thermostat may be inaccurate or faulty.

5. Repeat the test Try adjusting the thermostat a few degrees up or down and see if the heater responds. No reaction could mean the thermostat isn’t detecting temperature changes correctly.

Common Causes of Thermostat Problems

If your thermostat isn’t working properly, several factors could be to blame:

• Dust or dirt around the sensor, preventing accurate readings.
• Poor placement, such as near a heat source, window, or electronic device that affects temperature sensing.
• Wear and tear, especially in older mechanical models.
• Electrical issues within the heater that prevent it from responding to the thermostat’s signals.

Gently clean the thermostat with a dry cloth and make sure it’s not blocked by curtains or furniture. This alone can sometimes improve its performance.

When to Replace the Thermostat

If you’ve tested the thermostat and it still doesn’t respond correctly, it may be time for a replacement. Many electric heaters have replaceable thermostats that can be purchased separately. If your heater is older, however, it might be more cost-effective to replace the entire unit—modern models are often more energy-efficient and come with precise electronic thermostats.

Always disconnect the power before replacing a thermostat, and follow the manufacturer’s instructions. If you’re unsure, contact a licensed electrician.

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Getting the Most Out of Your Electric Heater

A properly functioning thermostat is just one part of efficient heating. To maximize comfort and minimize energy use, you can also:

• Place the heater correctly—ideally under a window to counteract cold drafts.
• Use a timer or programmable thermostat to lower the temperature at night or when you’re away.
• Improve insulation—drafty windows and doors make the thermostat work harder.
• Consider an external room sensor for more accurate temperature control in larger spaces.

A Small Effort with Big Benefits

Testing your electric heater’s thermostat takes only about half an hour, but it can save you hours of unnecessary heating—and money on your electricity bill. A well-functioning thermostat ensures both comfort and energy efficiency, making it one of the simplest ways to optimize your home’s warmth during the Canadian winter.