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That would be a whole new ball game! No, what I was proposing was simply a two port valve that opened when the CH port of the three port valve was open. ie no additional room stat, etc.

An extension of a heating system requires the flow and return to be connected BEFORE a three port control valve (similar to a by pass). The extension needs therefore to be controlled by its own two port zone valve. Where should the CH demand signal be taken from? At first site the white...