I looked at a job today and part of the project is to replace 7 wall mounted thermostats that control the radiant heat in the drywall on the ceiling. I would like to know if anyone has dealt with this and where I may find the appropriate thermostats?
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This is line voltage (120 or possibly 240) thermostat, as was commonly used with radiant heat at one time. You cannot use a simple bimetal thermostat which is designed for low current and low voltage applications.
Start by Googling "line voltage thermostat". You will see a wide variety of appearances and costs.
What you will probably not find are any programmable units or any of the other fancy amenities folks look for now.
For radiant heat, any programmable thermostat would have to be set up to turn on early and turn off early because of the delay time in most radiant heat setups.
There may be issues with the response time of the simple mechanical thermostats too, so you may want to check with an HVAC specialist who understands radiant heating to see whether there is currently anything better available than a simple like-kind replacement of what was in use here.
While you are at, take a good look at the wiring from the stats to the heating units.