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Hello, what is the water pressure in the boiler just before you re-pressurize it, and what is the water pressure that you pressurize it to.
How long does it take to loose pressure?
How old is the system?
Does it have an expansion tank installed?
We can go from there
Does this boiler also supply domestic hot water?
Tell me if there is a domestic hot water *tank also involved or not.
We can go from there.