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thanks for the replies, I suppose the possible advantage of having four loops is that if one ruptures you can isolate it and still have three, however on reflection I think i'll go for the single loop with 12mm bore pipe. Richardthe3rd: comment noted; I found a small local company with good...

Hi I am having underfloor heating fitted to our conservatory, the floor area is 20 sq m. Most companies seem to recommend a single heating pipe (12mm i.d.) for the whole room area, nu-heat for some reaosn use a distributor and have four sets of pipe in parallel, obviuosly they can use smaller...