Thermaflex delivered a major geothermal district heating project in Septemvri, Bulgaria, using its Flexalen 600 pre-insulated piping system. The installation, completed in three phases between 2017 and 2024, connected thermal springs in the Rhodope Mountains to Varvara village and Septemvri town. The lightweight, flexible pipes allowed efficient transport, reduced joints, and minimized environmental disruption in rugged terrain. This sustainable infrastructure provides clean, affordable heating to homes and public facilities, supports tourism development, and promotes long-term economic growth in the region.