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We have mixed taps in the US because our water heaters are set high enough to kill Legionnaires bacteria.
Same where I live - gas boiler in my parents house is programmed to heat water to 90C once a week. That solves the problem
Every time I read about Brits and their Don’t Mix Waters it reminds me of Koreans and their Fan Death.
Except it comes from an actual concern from before boilers were sealed off, it was entirely possible to things like rats to get inside them and die, contaminating the water.
Oh it was very important in centuries past, yes.