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CleanTechnica
Dec 22, 2022, 12:37 am126 ptsHeat pump water heaters (HPWHs) are a key technology for a zero-emissions 21st century. They are 2–4 times more efficient than fossil gas or electric resistance water heaters, emit little if any CO2 (depending on your electricity mix), and cost around $100 a year to operate. And, if you’ve got lots of…
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