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By transformer do you mean the burner unit, it's a Riello and is wired into my main breaker panel. There are 2 thermastats one for each level of the house and I have a new digital for each.

I have radiant in floor heat, 2 Honeywell dial type thermostats. Heat source is an oil fired hot water heater. Old therostats have 2 wires 1 black and 1 white. On the new multi terminal digitals...