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problem with water pressure on pressure guage?

my alpha h e cb 25 boiler water pressure is very high (4bar) what can i do to cure it ..thank you
dave charles, November 2009
Bleed water out of the system via a radiator bleed valve.....takes a little time but its the most boiler friendly way.

John, November 2009
link Click here to see other fixes for Alpha CB25.