Do they make a programmable stat you can use with zone valves?
my contractor said you need a three wire stat to be used with zone valves. Do they make a programmable 3 wire stat that can be used with zone valves? I need a model with a security code. When I asked him he said he'd have to find out.
I have a programmable stat with a zone valve using two wires. Not sure what he is talking about.... On my system the thermostat merely makes the call for heat, it is up to the controller to open the zone valve.
Others here will know a lot more than me though!