[papercreters] On demand water heater

Has anyone used an on demand water heater to heat a hot tub? Would this be wildly impractical? I would love to have an outdoor water feature where I could soak but am not up to figuring out solar or anything like that.

The Making of Papercrete DVD now available on Amazon.com
http://www.amazon.com/Making-Papercrete-Judith-Williams/dp/B0040ZNE9A/ref=sr_1_1?ie=UTF8&s=dvd&qid=1283998627&sr=8-1

Follow progress on the new project at http://www.papercretebyjudith.com/blog

More papercrete info at http://squidoo.com/papercretebyjudith

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