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Hello, one minute while I get some information together.
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You need to connect that wire to the COMMON side of the low voltage transformer. That boiler does not have a terminal to connect that to. You would have to get a low voltage transformer to supply the 24 volts to your thermostat separate as you can not do it from the boiler itself.
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First what thermostat were you previously using? A battery one? or mechanical?
Yes then I would either use a battery one as you will need two wires to run the powered unit.
Yes a battery powered unit, I use one and have never had an issue that would be the easiest route to go honestly
Yes they do have to be recharged more, or you will have to get a low voltage transformer and wire that in. You just need to run 120 volts to the transformer then 2 wires to the thermostat from the transformer then to do it.