JohnMo Posted August 11, 2023 Share Posted August 11, 2023 Hopefully a quick question. Background installing an unvented cylinder. Location is remote from the cold water manifold, preventing connection of the balanced port to the cold supply. House already has a PRV just after the stop cock set at 2.5 bar. Cylinder comes with a combined inlet set, set at 3 bar. Can I just blank the balanced line off? Do I need the second PRV to comply with regs? Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 11, 2023 Share Posted August 11, 2023 5 hours ago, JohnMo said: Hopefully a quick question. Background installing an unvented cylinder. Location is remote from the cold water manifold, preventing connection of the balanced port to the cold supply. House already has a PRV just after the stop cock set at 2.5 bar. Cylinder comes with a combined inlet set, set at 3 bar. Can I just blank the balanced line off? Do I need the second PRV to comply with regs? This falls into the realms of an UVC retro-fit. Done loads of them. Get the PRedV at the stopcock raised to 3 bar, as at 2.5 it will be quite restrictive. Install the control group / PRedV as per the MI's, local to the cylinder, but the one thing that all buffoons forget is to add a single check NRV to the hot outlet of the UVC. Do that and you are 100% kosher. . Warranty will be intact with that all done. 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted August 11, 2023 Share Posted August 11, 2023 If the water pressure is low, fit a 28mm single check NRV with 22mm internal reducing sets to go onto the 22mm pipe. https://www.monsterplumb.co.uk/yellow-brass-fittings-plumbing-3-part-reducing-set-28mm-22mm?gclid=Cj0KCQjwuNemBhCBARIsADp74QTP_RTBfjKXlco3sqsVMfzwwNM2VZD6XPgsquJDBtCMdL0ZOrihwYYaAsvyEALw_wcB 1 Link to comment Share on other sites More sharing options...
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