UAB “Šalčininkų šilumos tinklai” is a district heating company and supply ~18,5 GWh heat per year. We have been using UAB “Energy Advice” solution EA-SAS Heating based on Digital Twin technology from 2020. Thermo-hydraulic calculations and real time date evaluation is performed constantly in order to control the network and reduce losses. The digital model of the heating network also allows us to make fast and high-quality network development decisions. We confirm that even small town heat supply companies benefit from digitization projects, and we recommend Energy Advice as a reliable partner in digitization and energy saving.