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  • You dont need it, hive works off a switch from the boiler.

  • I'm pretty sure, but not 100%, if you're planning on replacing that thermostat with a hive one you'd also need to get power to it (so I think they're normally wired in at the boiler).

    I replaced a thermostat like that with a netatmo smart one as you only needed the two wires and no power.

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