Gebäudeenergiegesetz ("Heating Act") enters force

The amended Gebäudeenergiegesetz came into force on 1 January 2024. Most newly installed heating systems in new-build areas must use at least 65% renewable energy. Transition rules staggered by municipality size tie the full rollout in existing buildings to local heat-planning deadlines (mid-2026 for large cities, mid-2028 elsewhere).