Electrical Wiring for a 240 Volt Wall Heater

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How to Install Electrical Wiring for a 240 Volt Wall Heater: Thermostats will either involve the same size and type of wiring as the electrical circuit requirements or some thermostats are the low voltage type where a control circuit is contained inside the electric heater unit.

Electrical Circuit and Connections for a 240 Volt Wall Heater

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Electrical Question: I am trying install a 240 volt wall heater with a built-in fan to a thermostat.

  • The heater has two red wires.
  • The breaker is a double so I assume I need to connect white and black (12-2 wire)to the two poles on the breaker and the copper to the ground screws on the panel.
  • Where should I position the thermostat in the circuit?

This electrical wiring question came from: Chris, a Homeowner from Vancouver, British Columbia.

Dave’s Reply:
Thanks for your electrical wiring question Chris.

How to Wire a 240 Volt Wall Heater

Application: Wiring a 240 volt Wall Heater.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools, electric drill, auger bits and extension cord.
Estimated Time: Depends on personal level experience, ability to work with tools and install electrical circuit wiring.
Precaution: Identify the panel circuit, turn it OFF and Tag it with a Note before working with the wiring.
Notice: Installing additional circuit wiring should be done according to local and national electrical codes, with a permit and be inspected.

Example of Wiring a Wall Heater

  • Chris, Due to the limited information you provided I can suggest that you pay careful attention to the installation manual that came with your heater.
    • Typically a 240 volt heater will have three wires in a junction box or connection area.
    • A dedicated circuit containing 3 wires, two will be the 240 volt lines and one will be the ground wire.
    • The circuit size is determined by the required electrical load of the heater which is measured in watts or amps.
    • It is extremely important that the new dedicated circuit is sized correctly.
    • There are typically two types of thermostats
      • A thermostat that is mounted directly on the heater, located at either end
      • Or a thermostat that is located on the wall of the same room where the heater is being installed
      • Thermostats will either involve the same size and type of wiring as the electrical circuit requirements or some thermostats are the low voltage type where a control circuit is contained inside the electric heater unit.
        • Consult the heater installation manual for specific electrical circuit sizing and installation instructions.

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FAQs Frequently Asked Questions and Comments

4 Responses to “Electrical Wiring for a 240 Volt Wall Heater”
  1. Dave Rongey says:

    Hi Todd,
    All electrical circuits require a ground, in fact the ground wire is the most important wire of any home electrical circuit because of the measure of safety it provides if something goes wrong. It may be a good idea to find out why the ceiling heating unit is not working before proceeding with a new wall heater. It could be that the thermostat just needs to be replaced.
    I hope this helps,

  2. todd says:

    I have a radiant ceiling heating in a apartment that doesn’t work. The landlord wants to install a wall heater were the thermostat is. It is 240 volt circuit with no ground. Is a ground required per NEC Code?

  3. Dave Rongey says:

    Hi Todd,
    I totally agree, and understand where your coming from. The information available on this website is offered under the stated Terms and Conditions, and the liability is totally on the visitor. I especially make a point of telling visitors that for best results electrical work should be performed by a Licensed Electrical Contractor.
    However I will point out that a homeowner, where permitted by their local building jurisdiction and governing agencies, may choose to perform certain projects, and be held totally responsible for the work that they perform.


  4. todd says:

    Some work should be installed by a certified electrician, some home projects should not be attempted by home owners. I feel by giving information about installations is a liability to the person giving information.


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