Overview

• Consumer organizations in Germany have reissued seasonal guidance as heating systems are restarted for autumn.
• Gurgling sounds or unevenly warm radiators indicate trapped air that wastes energy.
• Recommended steps include fully opening the thermostat, warming the radiator, briefly opening the bleed valve until only hot water flows, then closing it.
• A radiator key, a small container and a cloth are typically sufficient, and multi-storey homes should be bled from lower radiators to the upper ones.
• ADAC cites up to 15% savings from regular bleeding, while older systems without bleed valves may require a careful wrench method or a professional.