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A comment on Gravity Energy Storage: Alternative to batteries for grid storage. Parent comment

Re:Gravity Energy Storage: Alternative to batteries for grid... by war1025 on Wednesday January 06, 2021 @10:42AM (#25658664)
Home heat pumps always have an exterior unit here. It's heat pump water heaters that don't [0].

[0] https://www.rheem.com/products/residential/water-heating/hyb...

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