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So the boiler to the rads just stays on (for a given number of hours, or the rad stat gets rammed up high so that the hot water always flows), and each rad decides how much hot water to consume? That sounds promising...
Pretty much - it's a throw back to how these things worked before thermostats. I think modern radiators come with thermo valves still so you can balance the heat in the home.
So the boiler to the rads just stays on (for a given number of hours, or the rad stat gets rammed up high so that the hot water always flows), and each rad decides how much hot water to consume? That sounds promising...