The GdW is responsible for around six million rental flats in Germany. By law, these flats must also be heated in a climate-neutral way by 2045. Up to now, the housing industry has mainly relied on heat from interconnected networks and on gas. If more buildings are heated by heat pumps in the future, partly due to lack of gas, many new questions will arise. Mainly because this area does not have any standard solutions yet. Even the possible transition from gas to hydrogen will be anything but simple. Here, too, many individual technical and regulatory questions are currently still unanswered. As a partner of Global Energy Solutions, the GdW would like to see assessments of the international hydrogen market of the future: Where could the hydrogen come from? Via which transport routes? At what price? And, last but not least: Which quantities will be needed in which sectors in Germany?