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We have adjusted the pump speed which didn't make any difference, will have a search for a vent, see if it can be manually bled. I was up this morning so I heard to boiler kick in for the hot water. I listened to it and it was faultless, so it is very much an intermittent problem. I had the...

I am on gas and have no immersion.

Good morning, I am after some advice please. About a month ago our hot water system started making some horrible vibration noises, our next door neighbour is a heating engineer, so invited him to have a listen. I couldn't make it do it while he was around, but from me describing it, he suggested...