Stock Photo - PRODUCTION - 11 December 2023, North Rhine-Westphalia, Remscheid: Hydrogen heating appliances run on a test bench in the laboratory of the manufacturer Vaillant. The German Building Energy Act (GEG) stipulates that in future, only heating systems that run on at least 65% renewable energy in the long term may be newly installed. The changeover is to be subsidized with up to 70 percent of the costs. Photo: Oliver Berg/dpa. - Remscheid/North Rhine-Westphalia/Germany

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