This is a great story about building a large solar water heating system using local materials and local labor. Lots of detail on the construction, and on the Pakistani culture and outstanding scenery -- you could make a TV series out of this.
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| Two banks of collectors thermosyphon hot water to the tank just above the collectors.  | 
Lots more on DIY solar water heating systems...
A couple pictures:
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| System diagram | 
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| Building the collector mounts. | 
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| Jo's Arduino based temperature logging system. | 
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| Wow! | 
Gary August 2, 2011




