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Baseboard Electric Heater Circuit Wiring

   
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How to Install a Baseboard Heater Electrical Circuit: When installing a 240 volt circuit for baseboard heaters it is very common to have more than one unit on a circuit due to the lower amperage per unit.


Install Wirng for a Baseboard Heater

Electrical Question: I am installing 240 volt baseboard heaters in my home. I have done the BTU calculations to install the correct size baseboard heater for each room.
My question is: can I put more than one room or set of heaters on the same breaker, provided the combined amperage does not exceed the breaker amp rating and the wattage’s are not exceeded.

This electrical wiring question came from: Mark, a Electrician from Richmond, Virginia.

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

How to Install a Baseboard Heater Electric Circuit

Skill Level: Intermediate to Advanced.
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.
Notice: Installing an additional baseboard heater circuit should be done according to local and national electrical codes with a permit and be inspected.

  • Baseboard Heater Circuit
    Yes Mark,  One circuit can be used for more than one baseboard heater in different locations as long as the circuit wire size is the same as the heater unit internal electrical wiring.
  • Circuit Breaker
    The concern is that the circuit breaker must provide protection for the smallest amperage capacity of any wire that is a part of the circuit.
  • Wire Size
    This is based upon the heater wire size and the insulation type.
  • 240 Volt Baseboard Heater
    When installing a 240 volt circuit for baseboard heaters it is very common to have more than one unit on a circuit due to the lower amperage per unit.

IMPORTANT:
Please keep in mind that the manufacturers circuit specifications are the ultimate guide due to the UL Listing.


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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 projects.

Comments

6 Responses to “Baseboard Electric Heater Circuit Wiring”
  1. Nate says:

    I have a baseboard heater ready to be hooked up in a bedroom. I had a contracter run the wiring and the room has been plastered since. My question is, the main power wire coming directly from the panel comes to the heater. Then from there, there is another wire ran to the thermostat location across the room. It is a 240 volt, 750 watt, 3.1 amp heater all ran with 12-2 wire. Wiring diagrams on both the heater and thermostat are very vague at best. How can I hook this up to work properly? Do i need a double pole thermostat and breaker? According to the heater booklet all it says is a 15 amp breaker. Thanks!

    • Dave Rongey says:

      Hi Nate,
      To be precise I would need to know the Make and Model Number of the baseboard heater. Typical baseboard heaters are 120 or 240 volt, requiring a 1-pole or 2-pole circuit breaker respectively. The 12/2 circuit cable that has been installed may be used for either 120 or 240 volt, and a 15 or 20 amp circuit breaker may be used as specified in the instructions with the wiring in in the panel and to the circuit breaker configured accordingly. If the baseboard heater is 240 volt then a 2-pole thermostat is typically required, however the actual heater you have may have a slightly different type of control. Many baseboard heaters will either have a built in thermostat located at one end of the heater or a remote wall thermostat may be installed with the appropriate wiring as specified.
      Dave

  2. Panel Heating says:

    Electric Heaters are very necessary in our daily life and now a day’s these are really cheap and comes with latest technologies.
    This is one of the best way for heating in our properties.

  3. Ken says:

    Does electric heat unit or thermostat in a bathroom need to be GFI protected? It would be installed next to a toilet bowl and 18″ from a shower.. Thank You

  4. Steve says:

    Can you run the maximum wattage through a line voltage thermostat, or does it need to be 20% less than is listed. For example, can I use a 15 amp thermostat that is rated for 3600 watts, and run 3500 watts through it? Thanks

    • Dave Rongey says:

      Steve, if the thermostat is specifically rated for 3600 watts then that should be ok. Check the manufacturers specs and if that is their rating then your good to go within the limits of that UL approved rating.
      Dave

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