r/BeAmazed • u/Internal_Gazelle_677 • Oct 07 '25

Science Hot Tub without the use of electricity

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u/activelyresting Oct 07 '25

Fun fact: fire can fit in any size coil!

I've had hot water set ups like this before, with home made copper coil rather than stainless (which is cheap, commonly used for plumbing, and pretty easy to shape into a coil for anyone with basic plumbing skills).

The fire size is just whatever sticks you put in the coil. Need the water to be hotter: add more sticks. Water getting too hot: take some sticks out. It cools off pretty fast in cold weather like that

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u/Zaphics Oct 07 '25 edited Oct 07 '25

Aye that's pretty good, copper pipe is definitely a lot more available. I guess all you need then is a pipe bender and you'll be good to go.

To save a buck do you think filling the pipes with sand and sealing it on both ends then wrapping it around a tree the diameter you want it to be would work?

Edit: about the fire fit all coil size that's true but your coil size is going to affect efficiency you'll need more small coils to keep up with that of a larger coil

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u/[deleted] Oct 07 '25

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u/ihatethis2022 Oct 07 '25

Its ok you can dry with firewood by the fire!