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Electrical Wiring for a 240 Volt Wall Heater

How do I connect the wires for a thermostat for a 240 volt heater? How to Install Electrical Wiring for a 240 Volt Heater.

Home Electrical Wiring Video

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Using a Circuit Breaker Interlock Kit
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Electrical Circuit and Connections for a 240 Volt Wall Heater

Electrical Question: How do I wire a thermostat for a 240 volt heater?
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 or Electrical Contractor.
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, from the information you have provided I can suggest that you pay careful attention to the installation manual that came with your heater.

Types of Thermostats for Electric Heaters

IMPORTANT: Consult the heater installation manual for specific electrical circuit sizing and installation instructions.

More about Wiring an Electric Heater

Electrical Wiring for a Electric Heater

Electrical Panel

Home Electric Circuits

Circuit Breakers

Electrical Parts

For more information about 220 Volt Wiring Diagram
220 Volt Wiring
220 Volt Wiring Diagram

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Wire It Right with the help of my Illustrated Wiring Book

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Complete Guide to Home Electrical Wiring

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Handyman, Handy Women, and Electricians
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Wiring Home Electric Circuits
120 Volt and 240 Volt Outlet Circuits
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Learn more about Home Electrical Wiring
with my Online Video Course:
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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.

Electrical Tips to Help You Wire it Right

The Safest Way to Test Electrical Devices and Identify Electric Wires!

The Non-Contact Electrical Tester
This is a testing tool that I have had in my personal electrical tool pouch for years, and is the first test tool I grab to help identify electrical wiring. It is a Non-contact tester that I use to easily Detect Voltage in Cables, Cords, Circuit Breakers, Lighting Fixtures, Switches, Outlets and Wires. Simply insert the end of the tester into an outlet, lamp socket, or hold the end of the tester against the wire you wish to test. Very handy and easy to use.

The Quickest Way to Check for Faulty Electrical Wiring!

The Plug-In Outlet Tester
This is the first tool I grab to troubleshoot a problem with outlet circuit wiring. This popular tester is also used by most inspectors to test for power and check the polarity of circuit wiring.
It detects probable improper wiring conditions in standard 110-125 VAC outlets Provides 6 probable wiring conditions that are quick and easy to read for ultimate efficiency Lights indicate if wiring is correct and indicator light chart is included Tests standard 3-wire outlets UL Listed Light indicates if wiring is incorrect Very handy and easy to use.

Strip Off Wire Insulation without Nicking and Damaging the Electric Wire!

The Wire Stripper and Wire Cutter
My absolute favorite wire stripping tool that I have had in my personal electrical tool pouch for years, and this is the tool I use to safely strip electrical wires.
This handy tool has multiple uses:
The wire gauges are shown on the side of the tool so you know which slot to use for stripping insulation.
The end of the tool can be used to grip and bend wire which is handy for attaching wire onto the screw terminals of switches and outlets..

The wire stripper will work on both solid and stranded wire. This tool is Very Handy and Easy to Use.

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FAQs Frequently Asked Questions and Comments

4 Responses to “Electrical Wiring for a 240 Volt Wall Heater”
  1. 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.

  2. 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.


  3. 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?

  4. 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,