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thanks for the advice everyone, a great help I'm going to reduce to 15mm where possible and then 10mm later keeping the distances as short as possible. Thanks again Chris

If i were to use manifolds, the manifold at the end of the 22mm flow pipe with 4 10mm outs would feed 4 rads. 3 of these would be within 3 metres, another would be within 4 - 5 metres. what do you think? Alternatively I could lay 22mm and 15mm under the floor and then reduce further to 10mm...

Thanks for the reply, a great help. Last query. If I use manifolds then my plan would be this. To have the flow and return in 22mm. Half way along a manifold would feed two rads. At the end of the 22mm manifolds would feed 4 rads. Therefore, there would be 4 10 mm flows at the end of the...

thanks for the reply, thats a great help, Another query, what are the maximum guidelines for the length of 10mm going to a rad? I know it will depend on the pump but is there an average that is 'safe'? Chris

Hi, I was going to install a 15mm central heating system but am now considering 10mm microbore for ease of installation. There will be 4 downstairs rads and 4 upstairs rads. Have I got this right? the 22mm flow pipe should end in a manifold, out of which would be 10mm pipes to the...