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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Smart valves let you heat less of the house at a time
For instance on a weekday we heat the bedrooms to comfort level in the morning and evening, but have them fairly low in the middle of the day.
In short it’s efficient because the other radiators can stay ‘off’.
That said it’s not as much of a saving as you might think – a lot of boilers are not that efficient when constantly running far below their max output and you might be better off splitting your house into larger zones rather than per-room
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