Reliable, compact, and more environmentally responsible than ever—the new innovative heat pump technology from Viessmann enables particularly efficient use of ambient energy for heating and cooling. The Vitocal 250-A, with flow temperatures up to 70°C, was specifically designed for modernization projects. Existing radiators can be continued. Underfloor heating is optional. High energy efficiency, convenient app control, sustainable operation, and attractive design are all compelling features.