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Old 04-08-2010, 08:30 AM   #1
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Separate breaker for floor heat?


I am about to begin remodeling my bathroom. I will be installing a 15 sq. foot SunTouch floor warming mat/thermostat. According to the documentation, a 15 sq. foot mat draws only 1.5 Amps. I will be running a new 20A circuit to feed lighting and outlets in this bathroom only. Can this circuit also feed my floor warmer? Should I run a separate circuit for it?

If I decide on (or am required to run) a dedicated circuit, do they make breakers smaller than 15Amps? It seems safer to run even a 5- or 10-amp breaker if they so existed, that way if the mat shorted out it would be even less flow to cause a trip.

Ideas?

Thanks.

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Old 04-08-2010, 08:47 AM   #2
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Separate breaker for floor heat?


IMO it would be better to run a dedicated 20 amp circuit to the bathroom recep and a 15 amp circuit for the lighting and floor heat. We always use dedicated 20 amp recep circuits for bathrooms. The floor heat I am familiar with has an integral GFIC with the thermostat. The mat circuit should be GFCI protected.


Last edited by brric; 04-08-2010 at 08:50 AM.
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Old 04-08-2010, 09:26 AM   #3
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Separate breaker for floor heat?


Yes, the thermostat has a built-in GFCI. Not a bad idea to do the lighting and the mat on one 15a circuit, outlet on a dedicated 20a. I'll do that.

Is this lighting/heat circuit (no outlets) allowed to be shared with another bathroom in the future? I know the rule regarding outlets (one bathrom outlets+lights, multiple bathrooms outlets only).
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Old 04-08-2010, 09:42 AM   #4
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Separate breaker for floor heat?


Yeah, I'd keep it seperate, my lights are always on another circuit
Yes the lights & heat can be shared with another bathroom or any other room

Bathroom requires a dedicated 20a circuit that feeds all lights & outlets in that bathroom
OR
Can feed outlets only in multiple bathrooms

So as long as you have the 20a, anything else is above code
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Old 04-09-2010, 09:29 AM   #5
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Separate breaker for floor heat?


These runs will be perpendicular to joists. Do I need to install running boards if they are over a dropped ceiling?
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Old 04-09-2010, 09:37 AM   #6
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Separate breaker for floor heat?


No they do not. They are considerd protected in that case.

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