The invention relates to a device for utilizing geothermal heat comprising at least one first channel (10) through which a working material (12) is conducted downward into the interior of the earth and comprising at least one second channel (14) through which the working material (12) is conducted upward in a direction toward the earth's surface, whereby the first and the second channels (10, 14) form a system that is sealed off from the soil. The invention provides that the working material (12) is conducted downward into the interior of the earth via at least one throttling area (15, 16), and the throttling area (15, 16) throttles the working material (12), which is primarily a liquid in a direction of flow in front of the throttling area (15, 16), to a vaporization pressure (18, 20) so that the working material (12) can be, to a large extent, completely vaporized after the throttling area (15, 16).