• Rivalarrival@lemmy.today
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    7 months ago

    It has nothing to do with energy efficiency, and everything to do with UK plumbing. A building’s hot water system is presumed to be subject to environmental contamination, and not considered potable. Only the cold water supply is considered potable.

    It’s the same reason why they have separate taps for hot and cold water, while the US uses mixing taps almost everywhere.