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Your systems pressure relief valve
(PRV) should open at 3 bar ,and water should come out of that pipe outside. If the expansion vessel is functioning correctly ,your system pressure shouldn't get to 3 bar in the first place . Your pipes and radiators etc can cope with more than 3 bar.
(PRV) should open at 3 bar ,and water should come out of that pipe outside. If the expansion vessel is functioning correctly ,your system pressure shouldn't get to 3 bar in the first place . Your pipes and radiators etc can cope with more than 3 bar.