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My Ravenheat White Star is loosing water from the boiler a pint a day?

MY BOILER WHEN ITS NOT BEING USED HOLDS THE REQUIRED BARR PREASURE. WHEN THE BOILER IS IN USE ITS LOOSING A GOOD PINT THROUGH THE OVER FLOW p.s I had a plastic box taking the overflow.

Can anyone answer the problem
Thank you
Hamilton Keyes, November 2008
It sounds like it could be a faulty expansion vessel

Paul.M, December 2008
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