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Old 12-16-2008, 11:50 PM   #31 (permalink)
Bicycle Bob
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Join Date: May 2008
Location: N. Saskatchewan, CA
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Appliance White - '93 Geo Metro 4-Dr. Auto
Last 3: 42.35 mpg (US)

Stealth RV - '91 Chevy Sprint Base
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I drove a HPV, with no heater and lots of heavy breathing. I found that it was enough to keep a flow of outside air to the inside of the windshield - no heating needed. You can also use anti-fog treatments to keep any condensation flat and transparent.

If you want to carry some heat, the best thing is a phase-change material such as Glauber's salt which will put out an even temperature for quite a while, and put out far more heat in the useful range than a jug of water.

There is no excuse for a land vehicle to weigh more than its average payload.
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