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Mend Vaillant Dhw 242 Valve

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
VaillantHeating, Home Heating SystemsDhw 242 Valve
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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