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Old 03-11-2013, 10:33 AM   #1
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240v thermostat on 120v system?


I am installing a 120v radiant floor heat system in my bathroom. I already have a 240v thermostat that is for radiant floor heat. Can I use this thermostat if I wire it the same as I would for a 120v thermostat? Instead of 2 leads, just wire the one?

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Old 03-11-2013, 10:37 AM   #2
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240v thermostat on 120v system?


Don't know if it works on all thermostats or not, but I cut a baseboard heater from 240 to 120 and the thermostat worked just fine.
I just changed it at the breaker box; the rest of the wiring remained as it was.

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Last edited by Toller; 03-11-2013 at 10:39 AM.
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Old 03-11-2013, 11:39 AM   #3
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240v thermostat on 120v system?


You can wire it with one lead (hot) or both hot and neutral.
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Old 03-11-2013, 12:09 PM   #4
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240v thermostat on 120v system?


The 240 volt line voltage thermostat works perfectly well on a 120 volt circuit.

The reverse is not true. A thermostat rated for 120 or so volts may not have both hot leads of a 240 volt circuit connected to the thermostat unit even if there is a neutral giving 120 volts hot to neutral.
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Old 03-11-2013, 12:19 PM   #5
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240v thermostat on 120v system?


Awesome, thanks guys for the good info, it's well appreciated!
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Old 03-11-2013, 01:28 PM   #6
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240v thermostat on 120v system?


If it is an electronic thermostat it probably will not work. If it is non-electronic, then it should be fine.
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Old 03-13-2013, 06:42 PM   #7
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240v thermostat on 120v system?


The GFI probably won't work either....

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