Heating unit

A heating unit for heating carrying chambers in which a fluid is stored and carry the fluid from one location to another location by means of a vehicle, the heating unit comprising:

• a flexible body made of a flexible, fabric-like material and comprising an upper wall and a lower wall, wherein the flexible body is configured to be filled with a hot vapor, and wherein the flexible body is positioned between carrying chambers and an inner wall of a container;
• a plurality of support elements positioned in the flexible body, wherein the plurality of support elements are moveable inside the flexible body and the plurality of support elements are made of a material having a hardness such that, when load is applied to the heating unit, the upper wall and the lower wall are prevented from approaching each other;
• at least one joining part separating the flexible body into compartments by connecting portions of the upper wall and portions of the lower wall together, wherein the at least one joining part is provided between the plurality of support elements in order to delimit a movement of the plurality of support elements inside the flexible body;
• and
• at least one passage port in between the compartments, wherein the at least one passage port is configured to allow a passage of the hot vapor between the compartments.