This book contains comprehensive instruction in design, installation, and service procedures for typical solar space heat and domestic hot water systems. The book is comprised of five major sections. Solar Systems: Past and Present presents a brief look at how far solar technology has advanced. Included in this section are descriptions of over fifty solar system projects being built throughout the country. The Sun and Solar Energy Collection sections discuss the sun as an energy source. Included in the Lennox Space Heat/Domestic Hot Water Systems section are descriptions of components, operating modes, control, equipment selection, installation, maintenance, and troubleshooting. The final section, Lennox Domestic Hot Water System, describes a solar system without space heat capability. A glossary of solar terms is appended. (LRA)