The Austrian State Hospital of Feldkirch (LKH) is the main hospital in Vorarlberg with approximately 550 beds. Hospitals of this size need corresponding amounts of energy to be able to maintain their operation adequately. As a source of energy, steam plays a considerable role in the energy consumption and hence in the running costs of a hospital, as energy is becoming increasingly expensive. Cost optimisation in patient care is one of the core goals for the Management of the LKH. For an operational management oriented towards economic and ecological concerns, it goes without saying that cost optimisation in supply technology has a high priority, for example through energy saving wherever possible.