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This post was duplicated twice (that’s what the other user’s were informing you of in the other duplicates). I removed the two other duplicates and kept this one as it had the most upvotes.
Check out https://solar.lowtechmagazine.com/
If I didn’t live in the woods (and thus mostly in shade all day) I’d totally build a solar hot water heater. I’ve managed to reduce my showers to about 3 gallons, heating that much up with some black pipes on my roof or driveway would be extremely doable.




