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A comment on The humble water heater could be the savior of our energy infrastructure woes. Parent comment

Re:The humble water heater could be the savior of our energy... by JoeAltmaier on Wednesday July 07, 2021 @08:30AM (#27760331)
That would be an air heat pump. Water or earth-exchange heat pumps can work nearly anywhere. This article explains it well:

https://www.nordicghp.com/2017/01/heat-pump-effective-temper...

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