This manual was produced by the company FreeFuelForever to teach installers and user how to manage the Gravity Solar System. The system is made of evacuated tubes with the collector panels integrated with the storage tank. This is also commonly known as a direct system, which drains by gravity, i.e., system is unpressurized. The document includes as sections, system layout and description, installation procedure, inspection check list, cautions. It is a good example of manual for solar products.