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A comment on Hitachi launches CO2 heat pump water heaters with solar-friendly tariff controls. Parent comment

Re:Hitachi launches CO2 heat pump water heaters with solar-f... by gandreani on Thursday September 10, 2026 @01:40PM (#49647546)
Is the deep drain to diminish the air pockets at the exchange surfaces?
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Re:Hitachi launches CO2 heat pump water heaters with solar-f... by shellfishgene on Thursday September 10, 2026 @04:31PM (#49649765)
It's just so the cold water pipes sit in a pool of warm water. https://www.meanderhr.com/wp-content/uploads/2012/11/HXdrain...

This is even simpler: https://warmduscher.de/produkt/warmduscher-original/

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