Build A 500,000 BTU Solar Water Heater.
In this video from NikTheCat, you will learn how to build your very own 500,000 BTU solar water heater. Even on overcast days, this solar water heater still produces a very respectable 300,000 BTUs. 60-degree water on one end turns into steam at the other. Of course, you can tap into the water panels at different points to control the temperature of the water coming out. You can also pump the hot water into insulated barrels for 24 hour access to FREE solar heated water. This project calls for using a large amount of copper tubing however, you can also experiment with other materials to lower your cost.
Video Credit NikTheCat