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sparkgap that's really helpful thank you. The annual service is done by a big insurance company and the last bloke didn't have a clue what the PRV was! I even had to explain it! From the new mains - literally where it joins the house - is this PRV. From what you're saying can I assume this is in the wrong place as it seems from this setup the entire house must be limited by this. I assumed from the diagram inside the installation booklet it was in the right place. From what you're saying the PRV should be situated further upstream before the boiler cold inlet and a seperate mains supply leading elsewhere? Is my setup 100% incorrect or would there be an obvious bit of pipe routing that would confirm all is ok? I've ordered a JET PRV with a clear indicator of pressure and I'm going to have a go of fitting it myself when it arrives to see if maybe the old one is clogged up and not working how it should be. I'll let you know how I get on. thanks
Ideally, fit the PRV on the cold feed to the Istor. The separate cold feed to any shower or mixer valves should come off after the PRV as well to give a balanced supply. Everything else in the house should be directly off the mains and not the PRV.
If the servicing bloke doesn't know what the PRV is for and how to service it then WHAT THE **** IS HE DOING TOUCHING THE SYSTEM AT ALL? The Istor O&M booklet shows how to remove the PRV and clean the filter so this would be the first place to look.