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  1. M

    Vaillant 242E DHW problem

    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...
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