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    Domestic Hot Water Heat Exchanger Descaling Advice.

    My Vaillant VCW-sine 18 T3 W Domestic Hot Water Heat Exchanger needs descaling, what is the best descaler for me to use? It has been removed from the boiler. Alternately, does anyone know a place that will descale it for me near Croydon in South London? Thanks for any help.
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    Engineer to service Vaillant VCW-sine 18 T3 W

    Hi, I have a Vaillant VCW-sine 18 T3 W. I am finding it impossible to find an engineer to service/repair it in the Crystal Palace area (South London), they all say get a new one. The engineer who used to service it died 5 years ago, he always said these were the best boilers that can...
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