Floor Heat Help

[S276474]

I have a question regarding my floor heat. I have two tankless water heaters with circulation pump that provide the heat for my bay floors, heat for the automatic bay, as well as some of my exterior concrete around my change machine. The set up works great.. my only issue is now that I need to dial it back as it is set up to run constantly. My question is where would the best place to put a thermostat to where it will keep the automatic bay 40+ degrees, keep the self-serve bays clear of ice, but also not run constantly. I have a weepmizer connected to a probe that’s on the north side of my building but the system would still run constantly if connected to it. I’m thinking it wouldn’t have to go in my automatic bay.

Anyone have a similar setup or thoughts/ideas?

 

[Waxman]

I have 3 bays. I put my thermostat in the slab of my middle bay ( self-serve ). I drilled a small hole in the corner and dropped the t stat in and siliconed over top of it. Works well for me. My IBA has doors. I do not try to keep the IBA at 40 degrees; just over freezing is fine with me. I also have doors on my SS bays that I close at night when it's in the single digits. It was near zero last night. I kept all doors down overnite. Came in this morning and floor heat furnace was cool to the touch, slab read 45 and IBA was 34.

I set my slab stat at 43 and that seems to work for me. I could probably put it lower, but I don't like monkeying with things too much if they are working well.

I also have a separate temp control on my floor heat furnace return line. I'm still not really sure exactly how it works to save money, but I've only had it a short time.