I have a Worcester 24i combi-boiler. It's about 8 years old and feeds 4 rads. It's a sealed system of course, so there are no storage tanks.
Lately, I have been getting dirty water from the taps. It looks and smells like the water in the rads, grey in colour and smells metallic. It clears after a short while.
I have just drained the system and replaced a radiator that was sludged up. I have also injected Fernox cleaner into one of the rads and will soon drain that off and inject Fernox inhibitor.
I thought the water to the taps came straight from the rising main. Why might it be getting contaminated like this? Thanks guys!