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Hi All, Been asked before I know....don't shoot me. But didn't see a definitive answer. So I have started laying the pipework for my 12 port manifold. Areas are getting pretty congested with the feed and return pipework. As you can see from the pics, the WC room is worse than the M25 on a bank holiday. So it may get a bit warm in there... Should I try and space them out equally and as mush as possible? What is the optimal min distance? Or should I "just insulate every other pipe in the congested areas with 9mm wall armorflex" a la @Nickfromwales? Only hesitation is I'm not sure whether I have sufficient room to insulate every other pipe. Also I'd need the slitted stuff which looks a bit pricey too. I also don't wanto end up with a very thick diameter as my concrete slab is only 100mm thick. Also, 16mm pipes are cable tied to A142 mesh. I have some long feeds and return legs as well, and I am tempted maybe to leave 30-40mm between the pipes. I don't mind a bit of 'overheating' along the peripheries of some rooms (see entrance hall) as long as there are no implications for the concrete slab. Thanks in advance. OB