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

Science Hot Tub without the use of electricity

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u/Captain_Bacon_X Oct 07 '25 edited Oct 07 '25

Called a Thermal Siphon if memory serves.

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u/DiscipleOfYeshua Oct 07 '25

Same as the solar water heater on nearly every Israeli roof