Abstract: A structural heat-exchange element has a structural part including a body portion of ceramic foam material and outer wall portions spaced from one another in a first direction so as to laterally outwardly bound the body portion and having a higher thermal conductivity than the latter, and conduit elements for passing a heat-carrying medium through the structural part and formed by a plurality of passages extending in the structural part in a second direction transverse to the first direction and each having at least an outer wall which is formed by the outer wall portion constituted of the material having a higher thermal conductivity.

Abstract: A wall element for a construction wall to be associated with sanitary objects, has a body portion of self-supporting material, and provided with a channel-shaped gas-tight and water-tight inner hollow which forms a conduit for at least draining. The inner hollow is provided in the region of the body portion which normally serves for the connection of said sanitary objects, and has a height corresponding to the region of the requisite draining lines of said sanitary objects. The inner hollow has an inclined sole.