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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 fomine3 on Tuesday January 05, 2021 @07:32PM (#25653330)
In Japan, separated heat pump unit / tank is pretty ubiquitous and never seen union unit.

https://echonet.jp/introduce_en/gz-000505/

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