A new Dutch design has come out for a self-sufficient hot tub, no electricity needed. You first fill the hot tub with water. Then, in a small container attached to it, you start a wood fire. The heat from the fire goes directly toward heating the water.
Why have we never seen this? While you do have to plan ahead with something like this (because it can take up to two and a half hours to heat up), I think this would be a very sought after item. Once you make the initial purchase, you never have to pay for electricity. I would love to have one and I think it’s so clever. http://3rings.designerpages.com/2008/02/26/dutchtub/
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