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I haven’t found/seen one, to control circulators in RFH system. I emailed a coupla thermostat manufacturers, asking, but haven’t received a reply. Do you just get a regular thermostat, and use a relay of some sort, as with typical HVAC systems? Is this something most electricians would know how to put together? And are relays pretty cheap and easy to come by?
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We used regular Wirsbo t-stats w/ relays to the pumps. Later, for more control, we wired in a Magic Module, an awesome programmable logic controller from Elk Products. The relays should be only a few bucks and readily available. Not being the electrical guy who designed and wired this, I have just exhausted all my knowledge of it.
*Jim, Cloud is right. There are many more options in 24-volt T-stats than in 120-volt ones. And 24-volt to 120-volt relays are readily available. If you really want a 120/240-volt programmable, I probably have one laying around. I had to order one up for some odd-ball application and then didn't use it. I agree that they are not easy to find. -David
*I used taco 007 cartridge circulators with a built in 24 relay. they are pretty inexpensive, and work good. I control them directly with a 24 V thermostat, although I expect to design a more sophisticated control system in the future. If these weren't available I probably would have bought a fan control relay for a forced air furnance to control the circulator.http://www.taco-hvac.com/product.html
*Thanks, guys. Been rushed up/busy last coupla days, but will check into all these, as usual, helpful replies.