Join Date: Apr 2006
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I've used solar hot water heat, and if you are someplace with bright sun & don't mind taking your showers after noon instead of in the morning...the "fixed" ones certainly work. I'd expect the plastic "hot water heaters" (black plastic bag that hangs in the sun) for camping use do a reasonable job the same way.
No, you can't use it as a sauna, but the alternative is always to boil a big pot of water and pour it into your shower bucket. Not elegant, but that still works nicely for a "Navy shower".