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I guess not, but there's a lot of them, and the extra cost over solder fittings must have been significant! Thanks for the reply, that now makes perfect sense. I didn't realise we had a circulator pump, so was trying to understand why something seemed to be feeding back into the HW cylinder...

Hi, I've moved in to a new house. I've been trying to get my head around the boiler cupboard plumbing layout - I have fitted a magnaclean to the Return of the boiler loop, which I'm pleased with. However, the thing I'm mystified about is the pump location and what it's doing. The background...