District heating substations as a link between hot-water network and internal heating installations in buildings are used to adapt high pressure hot water to temperature and pressure conditions required by space heating systems of buildings as well as by the systems for the preparation of hot service water in buildings.
District heating substations initially had direct construction, i.e. the same water circulated both in internal heating systems and in the hot-water network. Due to operation reasons we later on switched exclusively to indirect heating substations, i.e. the water circulating in the primary part of the district heating substation and the water circulating in internal heating systems of individual buildings are separated by heat exchangers. At the moment there are approx. only 15 percent of district heating substations with direct construction that are still in use.
Today, we install mostly the socalled compact heating substations. These substations are much cheaper. Due to small dimensions and the built-in modern regulation equipment, they are user-friendlier and appropriate to be installed in auxiliary living spaces.