scope:

This guideline shows planners and installers the options for functional checking and yield rating of solar thermal systems, and what are the prerequisites for using these options. To the operator, it points out possible actions to take for checking specified normal operation of a solar thermal system.

This guideline neither can consider all options for functional checking or yield rating, nor can all variants in system design or in the use of the solar thermal system be examined. The following content will focus on the functional checking and yield rating of solar thermal systems for heating drinking water. However, the recommendations given can be applied to solar thermal systems serving other purposes, in which case adaptations such as more extensive instrumentation may be required.

The examples given can merely illustrate the principle of checking or evaluating. Suitable adaptations may be required in individual cases.