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Heat-pump water heaters are a winner for the climate — and your wallet
(www.canarymedia.com)
This is a most excellent place for technology news and articles.
There are multiple ways to do geothermal. We have 2 I believe 150ft closed loops that live around 6' under the yard. They also have vertical bore loops that go straight down which require way less land. Lastly is open loop, which would be a set of lines that run to a pond, or i guess any body of water to do that heat exchanging.