New: Free solar thermal calculator


Do you know how much of your hot water and heating needs you can cover with a solar thermal system? Find out now with our new, free solar thermal calculator T*SOL online at!

T*SOL online determines the yield of a solar thermal system with just a few details about your location, system type and heat demand. When selecting the system type, you can use preset values or select your specific collector, boiler and hot water storage tank from an extensive product database. In the last step, the annual simulation is carried out based on current climate data. The result shows the solar fraction for the selected hot water or heating system in a graphical representation.

Are you looking for a simulation with more options such as profitability analysis, comparison of variants and a detailed project report? Try the 30-day trial version of our design and simulation software for solar thermal systems T*SOL.