As a huge fan of renewable energy, Popular Mechanics have an article on how you can build your own Solar Water Heater.
As millions of Capetonians will attest, there’s only so much electricity to go around. When grid power is interrupted for whatever reason – perhaps as a result of huge urban growth, or when a stray bolt falls into a nuclear reactor – things start falling apart, sometimes literally.
At times like this, the most unlikely people speak darkly of an imminent breakdown in society, start hoarding cans of baked beans, and speculate on the practicality of a cabin in the woods powered by solar energy and biological waste.
That is from the site that will tell you what you need, how to do it and even where to put it. ON YOUR ROOF!!!
Check it out....