Klaus Warnecke

The Institut für Solarenergieforschung GmbH is a research institute located in Emmerthal, Germany. The German company promotes the use of solar energy through applied research and the training of young people in the areas of "photovoltaics" and "solar systems". The company cooperates with industry, other research institutions, and universities and are an institute of the Leibniz University of Hanover. The company ultimately controlled by the State of Lower Saxony. The CEO of the company is Rolf Brendel.

Part of Stiebel Industriebeteiligungs GmbH & Cokg, Dr. Theodor Stiebel Werke GmbH & Co. KG is a German company that wholesales electrical equipment. The company is based in Holzminden, Germany.

STIEBEL ELTRON Geschäftsführungsgesellschaft mbH is a private company based in Holzminden, Germany. The CEOs of the German company are Kai Schiefelbein, Nicholas Matten. The company manufactures household electrical appliances.

STIEBEL ELTRON GmbH & Co. KG engages in the development and production of household technologies. Its product portfolio includes heat pumps, solar installations, ventilation systems, water heaters, water boilers, hand dryers, air dehumidifiers, storage heaters, and air conditioners. The company was founded by Theodor Stiebel in 1924 and is headquartered in Holzminden, Germany.