![]() Using a wall thermostat to turn off the boiler as weather improves it was said it should be installed in a room on ground floor, with no outside door and no alternative heating, however that room rarely exists, so normal is mount in the hall and set the sequence same as the TRV but a couple of degrees higher, so in winter the boiler will never turn off by wall thermostat, the TRV's do all the work. Perhaps I'm nuts for putting A/C in a convertible, but it's my daily driver and 100. ![]() The main point is a hard wired motorised valve does the same job as a linked TRV, so it is either/or, not manufacturer seems to have a modulating control with both hard wired motorised valves and electronic heads on TRV's, which makes sense, as both are motorised valves. The older I get, the more interested in creature comforts I become, so air conditioning for my '64 Valiant convertible found itself near the top of the modification list. Wiser does a three channel version of their wall thermostat, but only the single channel is recommended for use with the OpenTherm module. Seems an old post April last year, EPH, Nest, Wiser, EvoHome all use OpenTherm which is I think a 0 - 40 volt signal to tell the boiler what output is needed, it seems only the EU version of Tado uses OpenTherm, although not checked on this, Wiser and EvoHome it is an add on module, Nest built in but Nest does not connect to any other sensors in the UK, in USA you can get temperature sensors, but not UK, most the others the sensor is built into the TRV, except for EPH which you set the wall thermostats as master and slaves to connect to boiler, and as far as I am aware it is the only one which can use OpenTherm and hard wires motorised valves, which is common with new homes. ![]()
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