Can Solar Heating - interesting

Sometimes, low-tech solar devices are much better than high-tech ones for home use, as they not only tend to be cheaper to make, but will also last much longer before any repairs or maintenance are necessary.

And even better, they can be built in part from repurposed or recycled components, which is something you don’t see very often in new solar devices.

http://www.whydontyoutrythis.com/2013/05/build-a-solar-heating-panel-with-soda-cans.html