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If you wan to get ahead of an engineer and order part for him to install ( rather than him order it/have to return) then order here - they also do a part search via Whatsapp. - https://www.unventedcomponentseurope.com/pressure-temperature-relief-valves/ - HTH

3.5 bar may be too much. It should be at 0.2bar below standing pressure. Measure that, drop the pressure/Isolate it and then repressure correctly or else it wont compress when cylinder water expands into it. Thats not to say the T+P valve isnt faulty.. i had one 90 degree rated unit go on me at...