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    Vaillant ecoTEC 428 plus. (VUGB286/2-OH)

    Hello, Firstly please excuse my lack of knowledge with heating systems, ill Try and explain what I’m Trying to achieve the best I can. As per the description I have a 428 heat only boiler recently converted from open vent to a sealed system. This is operated by a Yplan and Hive controls. The...
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