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Here’s how it works:
You fill the interior vacuum tube with about a pint of water. Unfold the two parabolic reflectors to focus the sun’s rays directly onto the water tube. Position the Hot Water Rocket so that the reflectors face the sun. That’s it. In no time at all, you’ll have piping hot water.
The only drawback is that you’ll have a hard time deciding exactly where to keep it – with your go-bag? With your survival supplies? With your camping or hunting gear?