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  1. Crumpet9162

    Combi as System - overflow

    Hi, I have a Worcester Greenstar 30cdi Combi, with a vented cylinder. The DHW feeds only the kitchen tap. CH is a Y plan. When the mains water is off, the hot tap runs hot, presumably draining the cylinder. The level in the header tank drops. When the mains is on, but the cyclinder is...
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