The paper presents a possible solution for the increasing of the efficiency of the centralized heating systems. Romania possesses important geothermal resources. These may be utilized in conjunction with the classical hot water boiler heating systems. The paper proposes a scheme to use the low enthalpy geothermal resources using a water vapours heat pump to increasing the efficiency of a centralized heating system. Although the water vapours are not an ordinary agent, due its inconvenient, in certain conditions this natural agent represents an alternative to conventional solutions. A case study is presented

Keywords: Geothermal energy, Heat pump, Energy efficiency, Geothermal water