Drain water heat recovery seems like the best efficiency boost for water heating... | Hacker News

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		ip26 on April 12, 2024 \| parent \| context \| favorite \| on: An open source initiative to share and compare hea... Drain water heat recovery seems like the best efficiency boost for water heating. Completely passive, 60% extra heat energy. At least for cold climates. Heat pump water heater might be phenomenal in a Phoenix garage.

_JamesA_ on April 12, 2024 [–]

A heat pump water heater seems phenomenal to me in an Austin attic. And I use the cold air generated to cool a wiring/server closet. Win/win.

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