Hi there, I have a Worcester 24CDi which was installed approx 6 yrs ago. I've noticed over the last few months that when I run the hot taps black bits are coming out with the water. These black bits look to me (the untrained eye) to be carbon deposits. Has anyone else seen this? If so, is this a warning that something could be wrong with the boiler? I have my boiler serviced each year and mentioned this to my Gas man only 6 weeks ago and he told me to clean the inside of the taps but I'm not convinced that dirty taps is the cause of the problem! Any advice would be appreciated!