by Kenj »
Sat Mar 01, 2008 7:53 pm
A pump fitted the wrong way round could well push hot water into the C/H header tank. However, I do not think that this is your problem, as this would not explain the discoloured hot water or the header tank overfilling.
In an Indirect System such as yours, the hot water drawn from the hot taps is totally separate from the water flowing through the boiler that heats the H/W cylinder. If the water from your hot taps is dirty, then this separation has broken down, and dirty water from the boiler is mixing with clean water from the H/W cylinder.
Check that the water in your Cold Water Storage tank ( the larger of the two tanks in your loft) is clean. If it is then the only likely source of the contamination is a broken coil in your H/W cylinder. If this is the case you will need a new H/W cylinder.