In addition to the traditional Baumann inn - located in the foothills of the Alps between Munich and Lake Tegernsee - the restaurateur family planned and built a modern extension. Half of the new building is a hotel with 16 rooms, the other half houses 10 apartments. Building services represent a step towards sustainability: thanks to sophisticated planning and technology, it is possible to cover the high demand for space heating and hot water exclusively with efficient heat pumps and renewable energies. A photovoltaic system with 120 kWp completes the ecologically and economically sustainable overall concept.

"We wanted to heat in a contemporary way. With the latest technology in all areas, we are equipped for the future," says Ludwig Klier, third-generation hotel owner. As far as building services are concerned, he had practical expertise in the family with the installation company of his cousin Karl Klier. As an intelligent solution, he was recommended a heat pump system, for which there were also generous subsidies. The most important prerequisites for climate-friendly and cost-effective operation of the heating system were planned from the very beginning: a high-quality construction method with optimal insulation and the large in-house PV system, which supplies the building with green electricity including heat pumps. Matthias Moosbauer from Hoval confirms how innovative the project is: "Due to the high demand for service water and heat, hardly any hotel can do without gas, oil or pellets. The new hotel is one of the few hotels that heat and cool completely CO2-neutrally."

The latest technology from Hoval ensures that heat pumps also work in the required performance range.

says Moosbauer. For the new building in Otterfing, Bavaria, three Belaria air source heat pumps were installed per (24) – one for all apartments and two for the hotel area. The fact that the two hotel heat pumps are connected in cascade increases performance, saves energy costs and provides safety, as Matthias Moosbauer explains: "The power range thus ranges from 10 to 48 kW. Thanks to the infinitely variable modulation, the air source heat pump adapts to the energy demand and only produces what is needed at the moment." When heating demand is high, the two devices work together. In the transitional period, on the other hand, they run alternately. Even in the event of any failures or maintenance work, the other heat pump steps in. This ensures that the supply during ongoing hotel operations is ensured at all times. The narrow building plot also spoke in favor of the monobloc heat pump, Moosbauer adds: 

As in the planning phase, the value of a well-coordinated team was also evident during the smooth installation: "The installer is a Hoval partner. We have always been able to rely on each other from planning to commissioning. Together, we have developed a system that is perfectly tailored to the hotel and meets all the requirements for modern heating technology." In winter, the heat pumps now supply the underfloor heating, and in summer the rooms can be gently cooled via the concrete core activation in the ceiling. Thanks to the building management system and smart home system, the temperature in each room and for every need can be individually controlled. "The system is running perfectly," is the satisfied conclusion of the hotelier, who can now also score points with his guests with climate-friendly technology.