I have a zoned hot water baseboard heating system that currently has old mercury thermostats on a three-wire 24 volt system. I want to change over to electronic thermostats, but all the thermosts I saw at home depot say they will NOT work with 3 wire hot water systems (apparently they need additional isolation relays etc.). Is there any reasonably priced electronic thermostat I can use to do the conversion without all this isolation relay stuff?
thanks for your help.