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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Imagine that you have two rooms, one of which loses heat quickly and another that holds it well.
A normal radiator system would mean that if the hot water is circulating, it’s adding heat to both rooms at the same rate. But one room doesn’t need heat, so that’s wasted. The higher the temperature difference to outside, the faster that will lose heat, so that warmer room is losing heat faster.
Now, imagine that you have a generally well insulated house, but you have one room with big windows. It loses heat fastest. Your system now heats the ENTIRE house to get that one room to temperature, which is a huge waste. You only want that one room heated.
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