Projects Build Your Own Solar Thermal Panel
"This option is small-scale and it is built around a reclaimed heat dispersal system from an old refrigerator (which you can get with the gas removed from your local dump). It has no pump as it is gravity fed and it requires no electricity to work. Just put it in the sun, turn on the water feed and you will get a slow but constant supply of very hot water..."
How to Build A Rain Barrel. Every gardener and garden needs a rain barrel. By harvesting rainwater you can cut your bills and water your garden for free. You'll be surprised at how easy it is to build your own rain barrels, and this simple design is perfect for any outdoor space. You can connect your hose straight to it, or fill up a watering can.