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Yes, It is. Its just the hard wired controller side for the wireless heating thermostat.

I’ve recently removed a Honeywell BDR91 wireless receiver and controller and installed a Hive dual channel receiver in its place. The Hive is now hardwired using the existing backplate, with connections to Live, Neutral, Earth, and the three switched terminals 1, 3 and 4 for central heating and...