In this article the economic indicators of a two-pipe water heating system of a residential building in Ukraine and Poland are identified. It was established that the requirements for the premises in which the heating system is designed in Poland are stricter than the requirements in Ukraine. Most notably, in Poland, the maximum heat transfer coefficient of enclosing structures and the value of indoor air temperatures in residential premises, which should be maintained by the heating system, is lower. This allows the design of heating systems for residential buildings in Poland with a lower heating capacity. However, due to the higher cost of heating equipment and workers' salaries, the economic indicators of a water heating system in Poland is higher than in Ukraine.