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Thank you so much for the very helpful replies. As I stated, it was a hyperthetical question and have taken on board your replies. And because of your replies I managed to find a direct replacement :^O - Drayton LP241 and will probably stick the Horstmann on the bay. As for the zone valve...

and the answer to my question is....?

Hi all This is just a hyperthetical question at the moment... My heating system at home consists of a standard boiler with cylinder and cylinder stat, pumped with one 2 port zone valve (think it's 2 port), no room stat, TRV's on all rads and a Danfoss Set3M programmer I have been given a...