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dontknowitall
I suppose you could put a normally open 2 port valve on the return operated by a stat on the flow so if no heat in solid fuel boiler valve shut and in a power cut valve returns to open. Please check regulations as to wether this is allowed
I don't know much about solid fuel (learning) but I think this one is allowed. I was scratching my head earlier as I have been shown how this was done to keep within regulations, safety, etc. The trick is the "normally open" 2 port valve - I think!