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try looking for evacuated tube solar hot water collectors, then try to find some display samples, these tend to be tubes that are about 16" to 20" long, instead of the normal 6' to 8' long, just the right size to fit on your roof, or some other part of your car, and they get really hot, most solar hot water heaters get really hot, 160-180 degrees is common, I've seen them get up over 220-230 degrees if they don't have a good place to dump the heat, but most people who install solar hot water systems try to keep the temp lower to make sure pump seals, pipe insulation, and other rubber parts lasting longer, and to keep people from getting burns.
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