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the flow and return pipes upstairs originally had the manifold linking the two together which was a copper one. but you can't get a copper manifold for love of money so i had to use to plastic ones as there bigger and i'm restricted for space i had to put them next to each other on the one side...

help needed urgently. i've got a combi boiler sealed system the rads are fed with 10mm micro bore from a manifold. the upstairs manifold which serve four rads started to leek and had to be replaced from a copper one to two plastic ones ever since then the rads upstairs won't get hot both the...