Dirty water from taps! (Worcester Combi-Boiler)

[Olympus]

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!

[htg engineer]

The plate heat-ex has probably corroded and the water from the central heating will be mixing with the hot water. Replace the plate heat-ex.

Have you noticed any discolouration in the cold water ? any works been carried out to thwe main cold water supply in your area ?

hope this helps

[Oliver_murphy]

could be that your plate-plate heat exchanger has split,

[Olympus]

Yes. The discoloured water appears from both the hot and the cold taps in the kitchen and the bathroom.