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Thanks for that! - Bahco. I have carried out number 1, suspect 2 or 3, as described. I'll let you know of outcome.

I have recently started having water trickling out of the overflow from the hot water feed expansion tank. I have a 2 year old gas boiler. I originally thought the problem to be the ball valve so I replaced it (about 20 yrs old). The problem still occurred. It happens twice daily typically with...