1. A heating apparatus comprising a heating body and batteries for storing electrical energy, wherein:the batteries are grouped so as to form a battery bank having a parallelepiped shape which defines anterior and posterior faces of the battery bank;
the heating body forms at least one face located along one of said anterior or posterior faces of the battery bank, or above the battery bank, in the vicinity of the battery bank, so that heat produced by the battery bank adds to that produced by the heating body in order to create a circulation of air around the apparatus, by convection;
the heating apparatus further comprising
a first thermal insulation plate placed between the battery bank and the heating body;
at least one convection plate, whose first side is in intimate contact with the anterior or posterior face formed by the battery bank, so that a heat exchange is possible between the battery bank and the convection plate, and
at least one fastening means for fastening to a wall, located on a second side of the convection plate, opposite to said first side of the convection plate, the fastening means allowing mounting the apparatus on the wall so that the convection plate is located at a distance from the ground and at a distance from said wall, so that an air flow is possible, by convection, throughout a space arranged below the apparatus and a space arranged between said convection plate and said wall.