If building your own solar panel just got you interested, it may be time for you to go to the next level: a DIY thermosyphon solar heater. Total cost on the materials is around £175, so it pays for itself fairly quickly under current heating prices. Click here for a free and quite readable PDF of the instructions. [GT]
DIY thermosyphon solar heater [via Treehugger]
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From: BEST OF 2008: Eco-friendy and sustainable shoes