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Mend Heating Pipes Water Pressure

loud bag noise for few seconds till the boiler fires up,?

First thing in the morning when i switch the hot water on i get a loud bag, sound like air in the pipes. I have bleed the rads and the water pressure fine what am i missing. It don't mater which tap i use

richard
August 2012
Heating, Home Heating SystemsHeating Pipes Water Pressure
New pump required, had similar problems recently.

BL
August 2012

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Boiler Noise: Loud Bang When Hot Water On