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bonsaiTALK Journeyman
Join Date: Jun-2004
Location: Long Island, NY
Country: USA
Posts: 39
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I realize that this is a bit late, but when I was in high school, a science teacher had a greenhouse experiment. they did the soda bottles filled with water too. They used food dye and made the water different colors. They actually found that green absorbed the most heat.
They had a few other experiments such as running water in tubes through an adjacent mulch pile and into a lining in the floor of the greenhouse. the mulch gave off heat and helped heat the house also. They even built a solar panel to help heat aditional water.
Wish I had more info on it, but it was a lot of years ago.
Good luck!
Tony
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