Why let your bathwater go, or run, cold with you in it. Or have to pour more and more expensive hot water in when you can stay at what ever temperature you choose.
A cheaper alternative to a Hot Tub or Jakuzi and it fits your current bathroom size now. Just dial the temperature and it stays hot forever or at least until you want out. I want one now, since 10 or 15 minutes is all the hot water I get. What about Hours of hot water drawn from one tub of water. Saves money and time.
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