Direct to




Research and Testing Centre for Thermal Solar Systems (TZS)

The Institute of Thermodynamics and Thermal Engineering (ITW) has been working in the field of thermal solar energy since the early 1970s. In 1993 the Research and Testing Centre for Thermal Solar Systems (TZS) was established.

Meanwhile, TZS is the largest testing centre for solar thermal components and systems in Europe. TZS has, hence, unique and well established experience in testing the full spectrum of solar thermal products as well as in conducting research and development projects with partners from research organisations and industry.

In 2002, TZS was accredited (pdf icon) by the DAP (Deutsches Akkreditierungssystem Prüfwesen GmbH) for testing of thermal solar systems and their components according to European standards EN 12975/EN ISO 9806, EN 12976 and ENV 12977. We are, therefore, empored allowed to carry out tests according to the requirements of the European quality label "Solar Keymark". Furthermore, tests according to the rules of the U.S. certification authority SRCC (Solar Rating and Certification Cooperation) are being performed.

Since the beginning of 2017 the TZS is  also a member of the „Global Solar Certification Networks“. This provides an excellent basis that the tests performed by TZS are accepted globally by many product certification bodies.

The spin-off company SWT Technologyextends and complements the range of services provided
by TZS.

Information about TZS and the services offered by them can be found in our brochure:

Flyer German pdf icon        Flyer English pdf icon         Flyer Chinese pdf icon

Current Events


  • InterSolar Europe
    09-12 June 2015, Munich
    We will be present at the "Intersolar Europe" conference and fair. Visit our stand! We look forward to meeting you!
  • 25rd Symposium Thermal Solar Energy
    06-08 Mai 2015, Kloster Banz, Bad Staffelstein. - We will be present!

↑ table of contents


The TZS has placed its focus on the following research areas:


↑ table of contents


Modern outdoor test stands, test and measurement devices provide the conditions for the implementation of standard-compliant tests on solar collectors, hot water storage tanks, solar domestic hot water systems and combined systems. We advise companies in the optimization of solar systems and their components by means of simulation studies, create expert opinions, conduct market research and production tests.







Other Services:



↑ table of contents


Publications can be found in the general publication list of ITW.

↑ table of contents


Das TZS-Team



A current list of our staff can be found here.


↑ table of contents


Research and Testing Centre for Thermal Solar Systems (TZS)
Dr.-Ing. Harald Drück

Pfaffenwaldring 6
70550 Stuttgart, Deutschland
Tel. ++49 (0) 711/685-6 3553
Fax ++49 (0) 711/685-6 3503
mail E-Mail

↑ table of contents