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The cold water from a combi boiler system is always safe

The cold water from a combi boiler system is always safe to drink as it is fed directly from the mains however, this is not always true of traditional systems, which may store cold water in a tank before it is piped through the house. The struggle against corroding galvanized iron pipes eventually led to a replacement by copper or plastic (pvc) piping by the 1960s copper and plastic do not possess.

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