"Solar Thermal Systems" summarizes the theoretical and practical knowledge gained from over 20 years of research, implementation and operation of thermal solar installations. This work provides answers to a variety of key questions by examining current solar installations, drawing upon past experiences and making proposals for future planning. How do system components and materials behave under continuous operation? Which components have proven themselves and how are they used properly? What are the causes of defects and how can they be avoided? How long is the service life of modern solar installations? What is the difference between the various solar collectors? What performance can be expected from solar installations? And how are solar installations planned and structured correctly? In addition to practical recommendations on implementation, the theoretical background is also clearly explained. This book is a valuable guide for all those who deal with solar technology and at the same time a reference for the daily work of planners and fitters. It will also prove a useful tool for training and education.