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I think the idea is that the radiator is analogue controlled so will be at a set temperature as long as heating not turned on/off by thermostat so once set it will remain close to temperature set as not setting to a fixed temperature but a simple number on the dial, however the electronic heads measure water and air temperature and compensate air temperature reading using water temperature. And when my valve head reports 20°C for the room a independent thermostat placed on the fire (not running) opposite radiator does show 20°C also.You seem to be assuming that everyone has TRVs. However, if the wide range of non-thermostatic valves still offered for sale is anything to go by, that assumption is probably significantly off the mark.
I must say that I've never really understood how TRVs can really do what they say on the tin, given that they are sensing temperature so close to the radiator.
Kind Regards, John
I also tried moving thermostat before fitting electronic TRV heads, I bought
Not trusting thermostats I did not want to repeat same thing, so tried a pair of electronic TRV heads, they took time to settle in, but then I moved Honeywell thermostat back to hall, and the Horstmann put in kitchen on side of oven carcase and it was set to give morning boost then off rest of day and hall thermostat the Honeywell controlled boiler during the day, all was OK unless front door opened.
So then fitted a standard TRV to hall radiator and once set so at same temperature as wall thermostat it all then ran A1.
However then mother got worse so we moved in, one bedroom the smallest worked OK and kept warm, the other at rear would get too hot, and front bedroom too cold, so we bought another two electronic thermostats, however it seems the fault was the valves not turning off fully not the heads. However now they have been exercised a bit they are working quite well.
Hind sight, and hind sight is easy, I should have fitted EvoHome but at the time I thought I could latter fit Nest which works with energenie however do not intend to stop here long.
The Honeywell thermostat is not really suitable as it has built in anti hysteresis software which starts to cycle the boiler as it gets near to set temperature, however to use a thermostat without it with wireless also means no fail safe, and I am too lazy to hard wire a thermostat, unfortunately my boiler is bosch which does not support opentherm I would have to use a Wave thermostat which would only control one room to use a modulating thermostat.
Although we are told we should use modulating thermostats, as yet not walked into a single house where I have seen one fitted.