Eco-efficiency of District Heating Systems in Slovakia

District heating is an essential source of heat and hot water for households in the Slovak Republic. It is important to study the sector to be able to realistically assess the benefits and drawbacks that may result from the current state of the heating equipment as well as from the characteristics linked to its nature. In the paper we decided to calculate eco-efficiency using data envelopment analysis and then to compare the results of eleven companies producing heat in the country. The main goal of this analysis is to present the possibilities of this approach in the district heating sector as well as in other industries in future studies.