Overview

• Building owners must have consumption meters installed and operational by 30 September 2025, after which flat or floor-area allocations are no longer permitted.
• The mandate takes effect on 1 October 2025 and specifically covers centrally supplied heat pumps that serve multiple dwellings.
• Decentralized systems in single apartments or single-family homes are not affected by the new requirement.
• An interactive Wärmepumpen-Ampel map now offers an initial orientation on local suitability for air, ground and solar-ice heat pumps before contacting a specialist.
• The tool models about 17 million of roughly 19 million residential buildings using 2022 data, excludes groundwater systems, and the research institute estimates roughly 75 percent of homes suit at least one heat-pump type.