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I'm planning to run some 20mm PVC conduit along an external wall to supply power to an outbuilding. I appreciate that when run externally the various conduit fittings should be glued on to prevent water getting inside the conduit (this is in the peak district so there could be a lot of water...

I understand what boiler interlock is and how it prevents dry cycling but please can sombody explain to me HOW boiler interlock works when used in a system where every radiator has a TRV and one location has a room stat. (I've been told to fit a room stat as well as having a TRV on all rads to...