Thanks for taking the time to put down such a detailed reply. I don't think I'm going to tackle this myself, but it's good to have your insights before discussing with an engineer. Once again, many thanks for your reply. It's appreciated.
I've got an issue with my Vaillant TURBOmax 828E combi boiler and I am hoping someone might be able to help me understand the likely cause of the problem... The hot water occasionally goes cold mid flow. I first noticed this when taking a shower, so I had a look at the boiler (without turning the sh...
