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Connecting nest learning 3rd gen to burnham series 2 model 203 boiler. I am only using the system for heat. I have three wires at the thermostat R,W and an unused green that I would like to turn into a c-wire. How can I connect this wire to the boiler to become a c-wire? Option 2, Can I connect a c-wire adapter to the boiler end of the wire as to not draw power from the boiler? If so how?

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  • Is this a single zone or a multizone system? Also, does this manual match your boiler? Can you post your boiler's wiring diagram for that matter? Mar 17 '21 at 3:02

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