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15mm copper. I cannot all pipework runs either in wall or under floor. They do come down from abovr somewhere without putting holes in the walls or lifting floors i cant tell you

Cheers guys. Hansthebear ive been round to check and both sides have shield valves on is there any way to work it out in the loft where the header tanks are? Due the the pipes you mention must be located inside the dot and dab walls.

I have resently taken ownership of a new property with tenants living in already i wish to have a combi fitted to the property but after speaking at length to a sales guy he asked if i had a single piped system i said i didnt know. After researching for quite a while on line i am still trying to...