In this video you’ll see another example of how we can utilize the untapped power of the sun. I once saw a similar system for heating an in-ground pool without relying wholly on propane and thought it was quite clever. In this instance you’ll see how recycled materials and even something as simple as an aquarium water pump can be used to get amazing results. One of the things I liked most about this video is the section on improvements to the design. Watch at 2:38 to see these, and enjoy your freely heated water!