The District Heating in Ploiesti is a municipal scheme which provides hot water and heating for 57 900 individual apartments (150 000 inhabitants), 71 public institutions and 753 private companies. Although the system was created approximately 40 years ago, it is the most efficient among similar systems in Romania, and it is recognized as such by local and central authorities and by the private sector of the economy. Main results were obtained through these measures: 30% less primary energy consumed in order for 1 Gcal to reach our end-users >90% boiler performance during the heating system 46% less CO2 emissions 94% less SO2 emissions 44.3% less NOx emissions less than 14% losses on the networks more customers connected to the DH system