electric radiant heat

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  #1  
Old 03-08-07, 12:48 PM
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electric radiant heat

I am planning on using electric radiant heat under my 2 new bathrooms. I have 2 systems, each with its own control. They run on 240, the smaller one draws 2.5 amps, and the larger one only 3.0 amps. It seems like I can use one 20 amp 240 gfci breaker to run both....? is this a good idea?
any other suggestions?
 
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Old 03-08-07, 12:59 PM
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Provided your wiring is correct, yes.
 
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Old 03-08-07, 02:23 PM
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thanks for your answer...and now more questions....correct wiring!
The instructions call for 2 hot wires into the controller, and the ground from the house connecting directly to the radiant cable. There is no neutral. I assume that I cam use standard 12/2 cable, the black to one connection on the breaker, the white (with a marking tape) to the other, with no neutal leaving the breaker box....
or do I need more help then I thought?
 
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Old 03-08-07, 02:29 PM
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You are correct. There is no neutral for a straight 240 volt application.
 
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Old 03-08-07, 02:52 PM
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You may be able to save money on the the GFCI breaker. Many of the electric ceramic tile bathroom floor heaters have GFCI protection built into the thermostat control. A 2 pole GFCI breaker usually runs $60-$150 depending on the manufacturer of your panel. If the thermostats provide GFCI protection, you may use a standard 2-pole breaker.

Also, at that load a 15A breaker with #14 wiring is acceptable instead of the somewhat more expensive #12 wire.
 
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