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Thread: heated 120v floor and thermostat wiring

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  1. #1

    Default heated 120v floor and thermostat wiring

    I installed a 120v floor warming system for tile floor. Th cost of the thermostat exceed cost of wire, so in my wisdom, I opted to not use thermostat control from manufacturer but rather use standard double pole dimplex thermostat for electric heaters. Not sure if this was good choice, so here are my questions. Can I use this? I have a red, black and ground coming from the box (12-2) The thermostat has 2 red and 2 black. The tile floor warmer has one black, one white and a ground. If I can use this configuration safetly on a 15 amp dedicated breaker (Resistance of floor warmer is 7 amps), how do I wire it?

    I understand that I will not have thermostatic control of the floor. I was looking for a manual adjustment.

    Thanks

  2. #2
    Plumber jimbo's Avatar
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    I am not going to talk about the wiring sight unseen. But that arrangement is not the best for a floor warmer. If you put the T-stat up on the wall, you will essentially be trying to warm the whole room with the floor warmer. I would contact the manufacturer of the floor warmer to see if a "wall" thermostat is recommended or even allowed for their device.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    I think what you are attempting is very risky. Unless you understand what their thermostat is doing, you risk getting things too hot and burning things out - maybe including the house. It might be possible, but not something anyone here should recommend, especially since you don't indicate brand...too generic of a question. Sort of like - how high of a cliff can I jump off without getting hurt?
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    "Resistance of 7 amps" makes no sense. If the resistance is 7 ohms, on the other hand, that means the floor warmer will draw something like 17 amps on a 120V circuit, which is pretty substantial. I suspect the reason the recommended thermostat is so expensive is that it's got provision for modulating the current to avoid sudden heating and cooling, which could crack the tile and cause other problems. I've got a similar heater in my shower, and there's a probe under there that controls the thermostat -- are you sure the recommended thermostat doesn't come with such a probe?

    Spent the money and sleep well.

  5. #5

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    tiles are on and floor done. I could not set a probe if I wanted to. I guess you are suggesting I contact manufacturer? BTW, yes it was 7 ohms

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    Aspiring Old Fart, EE, computer & networking geek Mikey's Avatar
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    Quote Originally Posted by Andrew M
    I could not set a probe if I wanted to.
    Sure you could. Breaking up tile and resetting it is a lot easier than it sounds. Doing it so that you don't destroy the heater wire is harder, though.

    I guess you are suggesting I contact manufacturer?
    Yup. What make/model is the heater?

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