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So the BG chap came last week and without delay said the HW heat exchanger had packed up. He said it wasn't covered (just as you said) and wanted £200+ for a new one. After a bit of thought we agreed and he came back to fit it today. After a couple of hours he turned it all back on and...

If anyone can help me out with understanding how sludge is causing this problem and how to fix it I'd be very grateful. Cheers

Hi - anyone got any tips on this?

Thanks for the quick reply! Couple of questions - what is the likely cause of the sludge and why does it only seem to affect the taps furthest from the boiler? Also how do if fix it! Thanks again

Hi This boiler has kept British Gas servicemen off the streets ever since we moved in 3 years ago and took out one of their service plans. It's now 6 years old but most of the internal parts are much newer! The latest issue is that the hot water temperature has started to fluctuate quite...