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Thanks for the ideas. Will pass them on to boiler man, not that I should have to give him ideas though!

My boiler is about 3 years old and worked fine the first two. I have never had any problems with the hot water but, since last winter, whenever the heating is on for more than about 40 minutes it starts making an awful banging noise, which is very loud, and I have to turn it off. When I turn...