Method for obtaining geothermal energy from a water supply network, wherein - the geothermal energy is absorbed and regenerated by a water volume flow in the underground water supply network, - the water is conducted through at least one bypass line between sub-regions of the water supply network, for the connection of a heat exchanger tank and at least one circulating pump, and a ring closure line, coupling a pipeline of the water supply network, in the water supply network, for generating a circulating flow and increasing the water volume flow in the water supply network, - the heat energy is transported to the properties of the heat energy users with the buildings through a low-temperature distribution network, which consists of the water supply network and supply network secondary lines and also heat pump connection lines, - heat energy is extracted from the geothermal energy by geothermal devices installed in a building or in the earth of the heat energy users or adjacent thereto, - the heat energy for the heating and warm-water requirement is obtained by means of decentralized heat pumps at the heat energy users present at the water supply network, - water from the water supply network serves as heat source and heat carrier medium, wherein a part of the water volume flow in the pipelines of the water supply network is diverted through the connected supply network secondary lines, which are formed as bypass lines, in order that the connected heat exchanger tank, with an internal or external encapsulated absorber cavity system, through which refrigerant flows, of an absorber unit of the geothermal device, in the form of a metal pipeline, is flowed through and the refrigerant in the absorber unit is evaporated, and - the non-water-endangering refrigerant is, for the transport of heat, conducted in a closed circuit through at least one connection line from the heat exchanger tank to the heat pump, characterized in that a circulating pump is installed in the pipeline. - the geothermal energy is absorbed and regenerated by a water volume flow in the underground water supply network, - the water is conducted through at least one bypass line between sub-regions of the water supply network, for the connection of a heat exchanger tank and at least one circulating pump, and a ring closure line, coupling a pipeline of the water supply network, in the water supply network, for generating a circulating flow and increasing the water volume flow in the water supply network, - the heat energy is transported to the properties of the heat energy users with the buildings through a low-temperature distribution network, which consists of the water supply network and supply network secondary lines and also heat pump connection lines, - heat energy is extracted from the geothermal energy by geothermal devices installed in a building or in the earth of the heat energy users or adjacent thereto, - the heat energy for the heating and warm-water requirement is obtained by means of decentralized heat pumps at the heat energy users present at the water supply network, - water from the water supply network serves as heat source and heat carrier medium, wherein a part of the water volume flow in the pipelines of the water supply network is diverted through the connected supply network secondary lines, which are formed as bypass lines, in order that the connected heat exchanger tank, with an internal or external encapsulated absorber cavity system, through which refrigerant flows, of an absorber unit of the geothermal device, in the form of a metal pipeline, is flowed through and the refrigerant in the absorber unit is evaporated, and - the non-water-endangering refrigerant is, for the transport of heat, conducted in a closed circuit through at least one connection line from the heat exchanger tank to the heat pump,