This is a new one on me, vaillant system boiler and uvhw cylinder. Cold water is fine, hot water has a strong vanilla type of chemicalish smell. Anyone ever had anything similar?
I don't know it's for a customer, system is years old but smell is new. Sealed hw and ch system. Might well have a candle, but I went there thinking 'of course your hot water smells' but it really does.
there was one case I heard of were a smell was coming into hot water system , it was something to do with the unvented expansion vessel membrane decaying.
I'm going to say theat somehow one of the cylinders has probably been stagnant for some time and with recent valve problems he's had his handyman has somehow adjusted something to make one of the stagnat cylinders become active.
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