The ornamental design for an electric heating apparatus, as shown and described.
FIG. 1 is an isometric view of the claimed design.
FIG. 2 is a top plan view of the claimed design.
FIG. 3 is a bottom plan view of the claimed design.
FIG. 4 is a left side elevation view of the claimed design.
FIG. 5 is a right side elevation view of the claimed design; and,
FIG. 6 is a front elevation view of the claimed design.
The broken lines shown in the electric heating apparatus are included for the purpose of illustrating portions of the “article” and form no part of the claimed design.