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Excerpt from a previous thread. A member asked..... Hi, I'm currently in progress with gutting, extending and refitting my 50's semi including all plumbing, electrics etc. Stud partition walls have been ripped out, upstairs floors are (almost) up, ceilings down, downstairs ceilings coming down and concrete ground floor being dug up.. I pretty much have a blank canvas on which to work having moved out a few weeks ago. The idea is to have full UFH downstairs and radiators upstairs, with ideally an unvented cylinder to supply hot water to a bathroom and ensuite. The boiler and unvented cyclinder are to go in the loft. Due to the completely different location of the new boiler, and relocated mains water feed, all downstairs plumbing is to be re-done and the only worthwhile plumbing that could remain is the loop that feeds three radiators on the first floor. I have a couple of questions - Would it be best to re-do all plumbing for heating and dhw / cold water in plastic pipe or to reinstate in copper? What are the relative merits of doing either? It would be nice to have the visible pipework for the rads in copper and I'm guessing that with plastic I'd save quite a bit of time and cost not requiring earthing of all pipework. The other question is around the spec of a boiler. If I wish to have UFH and rad circuits along with an unvented cycinder (the latter is not critical but I think would be better due to wanting a power shower and such like) what kind of spec boiler am I going to be requiring? Any pointers on this lot would be very much appreciated.