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I'm hoping that somebody on the forum has had this dilemma before and is able to help… I'd like to replace my ageing C&M Britony for a condensing boiler. Looking at Worcester Greenstar 30Si or a Vaillant Ecotec 832 and it has become evident that there is a flue problem due to proximity to...

Have done a search of this excellent forum and the general consensus for similar boilers is that it could be the DHW flow switch. Could somebody please explain why this flow switch would cause the noise? Have had problems in the past with sludge build up (all gone now) could this be linked...