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The problem with using TRV's to control heating to every room, is as the weather warms up, the boiler starts to cycle as it can't turn down any lower, to some extent anti-cycle software can increase cycle time if on switch on water returns hot, or decrease if it returns cold, but it can never turn the boiler fully off.

So we have a very cleaver boiler that reads return water temperature and modulates so reducing the hysteresis, then we spoil it all by adding an on/off wall thermostat. OK some boilers do allow connection to eBus so an analogue thermostat can be used, but with a on/off thermostat we don't really want it to switch off until boiler fully modulated or each time it does, all heat in boiler is lost out of the flue.

The modern electronic head on the TRV can control each rooms temperature with a programmed change in the target temperature so only thing the wall thermostat does is stop cycling. So the boiler only wants turning off once it has started to cycle, as until that point some room some where in the home is demanding heat. But how does one detect it has started to cycle?
 
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