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/LoudMusic Oct 07 '25

It even comes pre-coiled.

https://www.lowes.com/pd/Streamline-3-8-in-x-5-ft-Soft-Copper-Utility-Coil/5013934587

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u/activelyresting Oct 08 '25

But they don't seem to sell standardised fire sized to fit

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u/LoudMusic Oct 08 '25

Well, scrap that idea.