The Revenge of the Hot Water Bottle
The Revenge of the Hot Water Bottle
solar.lowtechmagazine.com The Revenge of the Hot Water Bottle
Imagine a personal heating system that works indoors as well as outdoors, can be taken anywhere, requires little energy, and is independent of any infrastructure. It exists ā and is hundreds of years old.
![The Revenge of the Hot Water Bottle](https://fed.dyne.org/pictrs/image/887053e0-853b-4743-9aed-1d47d547dbed.png?format=webp&thumbnail=256)
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