Cleaning device and method for operating a cleaning device

A cleaning device, comprising:

• a cleaning container comprising a cleaning chamber and configured to accommodate cleaning material to be cleaned;
• a heat pump device which has an evaporator arranged inside a heat storage medium tank and configured to cause an increase in a volume of a liquid heat storage medium received therein through partial freezing of the liquid heat storage medium so as to displace at least a portion of the liquid heat storage medium;
• and
• an intermediate storage positioned above the heat storage medium tank, the intermediate storage being configured to receive at least the portion of the liquid heat storage medium displaced from the heat storage medium tank,
• wherein the intermediate storage and the heat storage medium tank are arranged relative to one another such that at least the portion of the liquid heat storage medium that is displaced to the intermediate storage is returnable to the heat storage medium tank due to a gravitation force, and
• wherein the heat storage medium tank is located at least partially below the cleaning container and the intermediate storage is arranged at least to a side of the cleaning container.