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The cylinder is made by megaflow, the boiler is glow worm

Its a megaflow gas boiler Im getting humming from the pipes when I turn of the taps It hapened when it was first fitted and the plumber fitted an inline valve of some sort and it stopped for 10months now it has started again It started again a few days ago It hapeds when you shut the tap...

I have an unvented heating system which is only 1 year old. When it was fitted they was allot of humming coming from the pipes. I called the plumber back and he fitted an inline valve which seemed to cure it. It has now returned and I cant locate the plumber. It happends on all the taps at...