How to Install a Baseboard Heater Thermostat

  • 4-8 hours
  • Advanced
  • 200-500
What You'll Need
Mounting screws
Wire nuts
Wire strippers

The baseboard heater thermostat helps you regulate the temperature in the room that contains the heater. The thermostat may be attached to an external wall or to the heater itself. Either way, connecting a thermostat is a relatively straightforward process that most people can complete less than 1/2 hour.

Step 1 - Purchase the Right Baseboard Heater Thermostat

Before you begin with the installation, you have to make sure you have bought the right type of baseboard heater thermostat. Your baseboard heater will be either 120 or 240 volts, and you need to purchase a thermostat with the same voltage. The thermostat position (on the wall or in the heater) will also depend on the specifics of your heating unit. Therefore when buying a thermostat, you should ensure that it complies with the parameters of your heater.

Step 2 - Turn Off the Electrical Power

Go to the circuit breaker panel and turn off the breaker that feeds electricity to the baseboard heater. (If you are not sure which breaker it is, switch off the main circuit breaker.) You must work in an electricity-free system, or you will endanger your own health and possibly your life.

Step 3 - Study the Manual

Take the thermostat out of the package and check the instruction manual for reference. Find the load and the line connections at the back of the device. The line connection will be attached to the feeder wires that come from the circuit breaker. The load connection, on the other hand, will tie in with the wires for the heater.

Step 4 - Connect the Line Connection

Find the feeder wires and remove 3/4 inch of their insulation. There will probably be three wires: a black, white, and bare/green wire. The black wire is the one the electricity flows through, the white wire is the neutral one, and the bare/green wire is used for grounding. Attach the black wire to the side of the baseboard heater thermostat. Attach the white wire to the load neutral wire. Attach the bare or green wire to the load ground wire. Finally attach the pigtail to the heater ground screw.

Step 5 - Connect the Load Connection

The load connection is the wiring that runs from the thermostat to the heater. Attach the black wire to the load side of the thermostat. Since the neutral and ground connections of the load side have already been attached, you have finished the thermostat connection.

Step 6 - Mount the Baseboard Heater Thermostat

You are now ready to mount the thermostat to the baseboard heater or to a side wall (depending on the thermostat type). Install the device with the mounting screws that came with the thermostat. Follow the manufacturer’s instructions.

Step 7 - Test the Baseboard Heater Thermostat

Now that the installation is over, you can test the thermostat. Go to the circuit breaker panel and switch the heater breaker on. Turn the thermostat on by rotating the main round switch in a clockwise direction. If you have completed the installation successfully, soon you will feel the heat coming from the heater.