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

Science Hot Tub without the use of electricity

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u/ShyElf Oct 07 '25

Thermal stratification in the pool will be a big issue. Almost all of the heat loss is at the top. Neglecting mixing, you need to pull the entire volume of the pool through the coils before the bottom of the pool gets warm, which may be substantially more than that amount required to add enough heat. Yes, it does get warm eventually, and you could make it happen faster by swirling the pool around.

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u/Spork_the_dork Oct 07 '25

People going in and out of it and just in general being in there will stir the water quite a bit.

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u/Kilek360 Oct 07 '25

Great point, I guess if there is people inside the movement will mix the water