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Cheers thanks for that,definitely that looks like that's the sort of thing it is.. The guy who put it in many years back vented the expansion pipe into the hot water tank & angled the overflow from that into the expansion tank, so after a few yrs of spicy tea I'm a bit cautious of what he might...

Hi, Got a leak today & on pulling up the boards I found that the outlet from the pump on 25mm goes to what looks like 2 sets of 8 10mm pipe connections in parallel. The outflow & return seem to connect to the same pipe with no valves or anything like that, just straight connections that then...