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home Fix label Heating label_important Home Heating Systems category Vaillant

d/h/w expansion vessel is air to be added vaillant 242?

what reason for air intake valve to domestick hot water expansion vessel
josh, January 2007
home Fix label Heating label_important Home Heating Systems category Vaillantdone
expanssion vessels have to have air in them to work, the valve is so it can be inflated

hi-spec plumbing, January 2007
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