We had a Baxi Combi boiler installed three years ago and 99% of piping replaced in the house. Small black bits of 'muck' have recently started flowing out of the bath hot water tap. When touched they resemble tar in terms of consistency and cannot be scrubbed off the bath surface using normal bath cleaner. I don't understand why the Bath hot water tap is the only tap in the house effected, especially because I know the piping from boiler to bath was all replaced at the time the boiler was installed. Any ideas would be greatly appreciated. Thanks.
could be wrong bodgeit (i,m a spark)but a similar thing happened to me . it sounds as if the small rubber washer has disintegrated in the head of your tap. simply turn your water supply off at stop cock and unscrew head off the hot water tap. the offending washer costs coppers from plumbers merchants. best of luck mate !