Abstract: A heat storage means with an inner container, an outer container surrounding the inner container with clearance and with the formation of a preferably evacuated insulating space has two ducts leading through the insulating space into the inner container, one of such ducts serving as a supply duct and the other serving as a return duct for a heat transport vehicle fluid. The duct sections passing through the insulating space pass from the lower side of the outer container through the insulating space as far as the upper part of the insulating space and then via a bend into the upper part of the inner container and the part, adjacent to the outer container and the bend of the duct sections are deformable and are preferably like bellows.

Abstract: In the case of a latent heat storage means having a storage medium consisting of or including barium hydroxide octahydrate at least the parts of the heat storage means exposed to the action barium hydroxide octahydrate consist of oxygen-free copper or an alloy thereof with one or more elements selected from the following group: nickel, chromium and phosphorus.