this post was submitted on 06 Feb 2026
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Science Memes

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[โ€“] Aceticon@lemmy.dbzer0.com 3 points 1 week ago (1 children)

All it takes is a water pipe painted black zigzagging inside a box which is black inside and has the sun facing side replaced by glass.

You can get hot water from something like that even in Winter.

[โ€“] SaveTheTuaHawk@lemmy.ca 4 points 1 week ago

you can get>200F from a passive solar air heater made of soda cans on a 30F day.

https://www.instructables.com/Aluminum-Can-Solar-Heater/