This video is to show a working DIY solar concentrator .It uses a 3' diameter but it needs to have very good adjustment to produce boiling water. 6' would be definitively perfect. A complete system connected to a tank water heater would cost 600$ to 800$ (no profit included) so it is interesting to think to this technology if you want to live free and happy like everybody should be on Earth ! see details: www.actionclimatechange.com
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