Systems engineered to harness solar heat in a controlled manner now include a diverse range of technologies, each serving distinctive needs in particular climate contexts. This text covers the breadth of solar energy technologies for the conversion of solar energy to provide heat. It is a wholly updated version of "Solar Energy Thermal Technology," first published in 1992. The text draws on the own author's research and that of colleagues/collaborators at Cranfield University, University of Ulster, Dublin Institute of Technology, Indian Institute of Technology, Delhi and University of Nigeria. Initial chapters deal with fundamental aspects of solar energy meteorology, radiative heat transfer, material properties and energy storage. Solar energy collectors are covered as well as applications. Covered are: the solar energy resource, its distribution in geographical, spectral, skyward geometrical and temporal domains; the physics of solar energy absorption, transmission and loss at surfaces; techniques for storing collected solar energy; and specific collector sub-systems. For each system, practical issues are discussed and a proven analytical procedure for predicting performance described. Analyses are presented in concluding chapters on solar energy systems. These range from dryers to greenhouses to systems that render buildings solar energy systems in themselves and the associated design issues. The context for any use of solar energy is the prevailing climate. This text defines the most appropriate regions for particular technologies and applications. It cites peer-reviewed literature covering engineering and applied science topics intended for use by students, teachers and researchers. Insight into the challenges of implementation are provided to help those undertaking feasibility studies, technical assistance, training assignments or operating testing facilities.