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thanks for that info.just drained water and checked pressure on vesel,its at 13 psi,i assume set from the factory.so i think that is right or too high?

my boiler has gone a bit gaga! over the past couple of days its been loosing pressure,so ive been topping up, but after monitering a few times have noticed that after a while the pressure builds and safety valve blows.when the system is off pressure drops and boiler goes into lockout. would...