I'm not an engineer, but I was reading the installation instructions of my combi boiler not half an hour ago for a problem I have. Seems if you want thermostatic valves on all your radiators you'd need a bypass point (looking at the diagram given it looks like a joining pipe between the other 2) to make a circuit.
Normally and a simple solution for this - is fit TRV's (thermostatic radiator valves) to all radiators apart from one - normally the bathroom one or the radiator in the same room as the room thermostat would be fitted with normal radiator valves.
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