[Engineer775 is always coming up with something cool and useful. This device he built from scratch and scrap materials and can be used to take advantage of the thermo-siphoning process... whatever that is. 
He mentions a previous video where he showed how to bend copper tubing with ice, which may be useful as well. As Engineer775 points out, this project is perfect for a rainy day!]
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How do I find that on your website?
Fascinating! Thermo-siphoning: cold water sinks; hot water rises; as the water heats up it will pull the cold naturally. At least that is my understanding
It’s kind of the same ideas the hillbilly camp bucket I showed a while back.
It’s nice to see what a bit of ingenuity can do, especially when you have the knowledge and skills to pull it off.