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Thanks for getting back to me. Expanding further on this would the introduction of additional radiators to the system cause this problem? I added two extra a few weeks ago and thats when the problem started. I know that the boiler bangs when the pump is on its lowest setting. When I moved it two...

I have a apollo 50/65 wall hung boiler. Approx 12 years old. Just recently it has been making loud banging noises after approx 1-2 hours when set to high. The problem is intermittent as some days it will run ok without any noise. I have introduced x2 aplications of boiler noise reducer and x1...