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hi, just a quick one. If you were to buy an unvented cylinder, would they usually supply the pressure relief valve, temp relief valve and expansion vessel??? or would you buy them seperately??? also, does the pressure reducing valve determine what sized pressure relief valve would be...

hi, yeah my dad had an ariston 27 Bffi combi fitted in his house maybe 4 or 5 years back. in the past 18 months they have had problems with the pressure relief valve getting jammed open and constantly discharging hot water outside, they have been through 2 domestic hot water expansion vessels...