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    Change Honeywell BDR91 to Hive receiver

    Hi can anyone help? I would like to change my BDR91 to a Hive receiver. My boiler is a Vaillant Ecotec 837. In my BDR91, there is a cable from the boiler and a feed from a fused switch. I’ve seen posts where there are only the cables from the boiler, so is it as simple as this?: The two blue...