Barlev, I knew someone would ask that. I forgot to add a disclaimer to my post that there are shaylos about bathing on Shabbos even if the water was heated in a halachikly muttar way. Which might be why such a thing hasn’t taken off. But there are circumstances when it can be muttar and it can even be helpful just to avoid the accidental issur of turning on the hot water faucet in the sink. During the winter I often turn on the hot water faucet for general hand washing because the cold water is very cold and the weather is freezing. I have to remember not to do this on Shabbos.
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