Is it possible to control smart radiator thermostat by wired smart thermostat (can it act as temperature sensor)?
The wired thermostat can act as a temperature sensor for the room it is in. The wired thermostat will need to be set as the measuring device. The radiator thermostats then become slave devices, i.e, they do not use their built in thermometers and when the wired thermostat says it's 21oC (if this is the set-point) then the radiator thermostats will close.
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