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Heat-pump water heaters are a winner for the climate — and your wallet (www.canarymedia.com)

submitted 10 months ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 9 months ago (1 children)

It depends. Spraying your dishes with water that is prone to legionella doesn’t seem super safe to me.

That is the real reason why UK / EU dishwashers use the cold water supply. They don't consider a building's hot water supply to be potable water. Their hot water was once held in atmospheric pressure, gravity-fed tanks, exposed to environmental contamination. Brits treated central hot water as unclean. This is also why they often used separate taps for hot and cold water. If they need clean, hot water, they heat cold water at the point of use.

The US never allowed atmospheric pressure hot water tanks. Our hot water is not exposed to environmental contaminants, and is presumed potable.

[–] [email protected] 1 points 9 months ago

As a Dane living in the U.K., I agree. I’d never seen an atmospheric pressure water system growing up but coming here, that seemed the norm. Now, 20 years after, the norm in U.K. new installation is high pressure water systems (so called “system boilers”) so it is changing slowly. But in the U.K. they have an almost mortal fear for high pressure systems, thinking they’ll explode at any moment.