It is vitally important to choose a sustainable, rational heating system and, in view of the trends of the European Union, as well as a system with lower harmful emissions. This work explores the efficiency of solar collector use in district heating systems. The wide application of solar panels allows to improve it overall efficiency by utilized exceed heat into district heating systems. Especially in small scale systems. Solar collectors are a type of renewable energy that is not only an ecological solution for heat generation but also increases energy independence. Within the framework of the work, a working specifics of district heating system has been studied, where different types of solar collectors are used for partial heat energy supply. By changing the area of solar collectors for constant heat consumption, the results on efficiency and effectiveness of use were obtained and analysed. The TRNSYS energy simulation tool was used for dynamic simulations. Researches, results and conclusions made in this research can be used in the work of engineers and designers to improve the existing centralized heat supply systems and to anticipate possible challenges in the newly built.