If each radiator calls for hot water when it needs it, won’t this be often and at different times, and therefore be a roughly similar energy cost to doing it less frequently but all at once?
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In theory, the smart valve allows for better control of temperature in each room, i.e. 20c rather than position 3.
You would still have the heating on a timer, e.g. between 6am and 8am, and then each radiator will call for heat during that time the boiler will fire.
It will vary from system to system, I have a Tado system (without smart TRVs) but you still set a schedule or times for the desired temperatures.
With Smart TRVs you could only heat the rooms needed in the morning and heat different rooms in the evening.
It allows for better control which should be more efficient rather than heating the whole house or running around turning rads on and off throughout the day
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