How do those water jugs with hot and cold dispensers heat and cool the water SO fast?
In: Technology
They use Peltier elements for both cooling and heating. They are also used in mini-fridges.
[https://en.wikipedia.org/wiki/Thermoelectric_effect#/media/File:Thermoelectric_Cooler_Diagram.svg](https://en.wikipedia.org/wiki/Thermoelectric_effect#/media/File:Thermoelectric_Cooler_Diagram.svg)
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