Heat supply networks were set up in the cities of the country 30-40 years ago, due to the fact that due to cheap energy resources centralized heat supply was applied both to heating the residential sector and to supply heat to industrial enterprises. In recent decades, due to the difficult economic situation, the contingent of consumers has changed and diminished, but heat supply networks in many areas have remained little changed. Upgrading the heat supply networks requires as accurately as possible to assess the needs of existing consumers and the dimensions of the new pipelines, thus ensuring a minimum operating cost in the future.