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This is 240V split-phase, so both hots are equivalent. The white wire should be remarked one of the 8 legal hot colors, since it is not a neutral. If I were wiring this in conduit, with the choice of any of 8 colors, I would use black and black because the hots are interchangeable; no need to distinguish hots from each other. This thermostat is single ...


Did you change out the boiler yourself or have it done by a contractor? It sound like you/they hooked up the thermostats in series instead of in parallel for the boiler "on". If you did it, go back and correct it ..... if they did it, get them back and tell them the problem. Good luck

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