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Cheers Dave, I will mail you. I have since been contacted by a Norwich engineer, good to know everyone doesn't want to scrap a good boiler. He's willing to do the repair and told me how scaling can be reduced so he sounds like my kind of engineer. I can see why not many people are experienced...

My Vaillant 242E is not producing enough hot water, engineer says heat exchanger prob. scaled up, not worth replacing, wants to instal new, larger boiler. Boiler about 15 yrs old & the ONLY problem in all that time has been DHW heat exchanger, which was replaced a no. of years ago. This has...