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Thanks for the responses so far. Here's a photo of the external multibloc I have that includes the 6 Bar PRV (Altecnic–Caleffi 22mm 3.5/6 Bar Multibloc Inlet Control Valve). To clarify, all the components I mentioned are external to the boiler (sorry if I wasn't clear enough). There's an...

Hi, When I turn on the hot water function of my gas combi boiler (Glowworm Ultracom2 35Store), I get a leak from the 6 Bar PRV attached to the cold water pipes beneath the boiler. I've had this situation for several months now, and it eventually appeared to progress to also leaking when the hot...