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Old 03-13-2009, 02:14 PM   #1
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Electric heaters, how many circuits?


I am looking to install 2 1500W 240V electric heaters in a basement. I'm going to use 12 gauge wire for each heater but here's my question:

I'm aware that 12 gauge is good for up to 20 amps @ 120V but if you are using 240V, does that mean you can go up to 40 amps and run both of these heaters off the same circuit/wire? And if so, would I use a 40 amp double pole breaker?

If they need to be run on separate circuits, do I just need a 20 amp double pole breaker for each heater or 40 amp?

Thanks for your help.

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Old 03-13-2009, 02:25 PM   #2
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Electric heaters, how many circuits?


12 gauge is good for 20 amps.
1500W/240V= 6.25 A each
Use 12-2, put them on one circuit with a double pole 20.
Just make sure your thermostat can handle the wattage.

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Old 03-13-2009, 02:41 PM   #3
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Electric heaters, how many circuits?


Thanks! I was hoping that I could save on extra length of wire and an extra breaker. I appreciate your help!
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Old 03-13-2009, 02:56 PM   #4
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Electric heaters, how many circuits?


Just to be complete, 12 gauge is good for 20A, 80% continous (16A). Your total amperage is 12.5 and you can put 16 on this circuit. Do these heaters have an internal thermostat? If they don't I recommend running your wire to the first stat and pigtail it to a second stat. This way you can operate the heaters independantly.
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Old 03-13-2009, 06:58 PM   #5
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Electric heaters, how many circuits?


Quote:
Originally Posted by Richo View Post
I am looking to install 2 1500W 240V electric heaters in a basement. I'm going to use 12 gauge wire for each heater but here's my question:

I'm aware that 12 gauge is good for up to 20 amps @ 120V but if you are using 240V, does that mean you can go up to 40 amps and run both of these heaters off the same circuit/wire? And if so, would I use a 40 amp double pole breaker?

If they need to be run on separate circuits, do I just need a 20 amp double pole breaker for each heater or 40 amp?

Thanks for your help.
You have been given good advice already, so I'll just clarify a little theory for you. Amps heat a conductor the same regardless of the volts. A #12 conductor is good for 20 amps period, 12 V, 30 V, 120 V, 600 V.
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Old 03-13-2009, 08:50 PM   #6
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Electric heaters, how many circuits?


Each heater will be controlled by its own line voltage thermostat so I will want them to run independent of each other.

I had a simple electrical class many years ago and learned about Ohms law, etc...just had been a while so I wanted to make sure I had it right before I proceeded.

Thanks for your great advice.

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