• If I have a smart TRV on every rad (bar one) then I don't need a main thermostat. If any TRV is calling for heat then turn the boiler on and provide some.

    I don't know if this is how off the shelf stuff works but in theory I could build my own with some ZigBee TRVs, a WiFI relay and a Raspberry Pi.

    I might do some extra detail like bedrooms are warm first thing in the morning on a school day to encourage teenagers out of bed but then cooler until they get home and go and do some homework (yeah right, just heat the telly watching room).

  • Depends on your boiler a bit. Some have fancy digital interfaces, mine just has mains present or not. Any mains relay rated at a couple of amps would work for me.

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