Solnet 4.0

Innovative solution and development concepts for the market preparation of solar district heating


  • Solar thermal energy
  • Energy supply
  • District heating
  • Market & policy
  • Energy concept


  • Study
  • Consulting
  • Technology transfer
  • Research
  • Pilot project
  • Market development


  • Public funds
  • Private financing


08/2017 – 12/2019 (2.25 years)


about 910,000 EUR


Solnet 4.0 is a cooperation of industry and research aiming at the market development of solar district heating in Germany.


Supportet by BMWi within the program EnEff.Gebäude.2050

With industry contributions from:

  • Arcon-Sunmark GmbH
  • Bosch Thermotechnik GmbH
  • GREENoneTEC GmbH
  • KBB Kollektorbau GmbH
  • Ritter XL Solar GmbH
  • Savosolar Oyi
  • S.O.L.I.D. GmbH
  • Viessmann Deutschland GmbH
  • Bundesverband deutscher Wohnungs- und Immobilienunternehmen e.V. GdW
  • Verband norddeutscher Wohnungsunternehmen e.V. VNW


  • Steinbeis Research Institute Solites (coordinator)
  • AGFW | German Heat and Power Association
  • HIR Hamburg Institut Research gGmbH
  • Guido Bröer und Andreas Witt GbR


The project Solnet 4.0 develops customized solution concepts for the market development of solar district heating systems. Furthermore, the aim is to spread the knowledge and experience about the technology in public and expert circles. The project will support the achievement of the “renewable energy scenario” in the “energy efficiency strategy for buildings” of the German Ministry of Economics and Energy. The scenario envisions an increase in usage of solar district heating systems.


In the first phase of Solnet 4.0, innovative solution and development concepts will be developed to overcome existing obstacles. A high quality and relevance for practice of the concepts will be guaranteed by including market players, know-how of suppliers and interdisciplinary competences of project partners.

The developed concepts will be refined and supplied to the specific target groups in the second phase. An impact on the target groups shall be achieved through communication and dessimination activities. These activities shall lead to an increased awareness of expert groups as well as in public, in how far solar district heating can play a key role in the change to more sustainable energy supply systems.


  • More efficient and successfull processes in the development and realization of projects
  • Establishment of large-scale solar thermal plants as heat supply technologies for the heat sector
  • Activation of multiplicators for the market preparation
  • Improved preception of solar district heating as a component for the energy transition

Downloads and links

Thomas Pauschinger

This project has received funding from

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