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Mend Water Heating Times Pressure

no hot water heating only works some times?

new air pressure vaulve fitted kicks in on the mornings not after that flue cleaned plumber at aloss at what it is fan working ok

eward
November 2008
what boiler? Could try changing venturi if applicable, seen them warp/open up with heat and fails to give diffential pressure to aps

iain
November 2008

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