Can anyone help, I had one of the above boilers fitted just over 3 years ago, not long after it was fitted it started making a lot of banging noise! Have had it serviced regularly, had it power flushed, inhibitor put through system etc. but problem not solved. Latest calamity though is that the boiler started to leak water and failed to operate, had our engineer in and advised need a new heat exchanger, not happy because of the age of the boiler. Contacted Worcester Bosch and they asked for details which I have provided but they have failed to advise me whether they have had any other complaints along these lines or indeed if they have made any modifications to the heat exchanger itself, my engineer even rang them and they wouldn't tell him anything. My engineer recalls speaking to an engineer from Worcester Bosch who was telling him that they do have problems with this type of boiler but would not commit himself any further, just told him that they routinely stick on £250.00 worth of parts and only charge the customer £100.00. Would very much appreciate anyones assistance.