Heating device

FIG. 1 is a perspective view of a first embodiment of a heating device showing our new design;

FIG. 2 is a front elevational view showing the design for the heating device of FIG. 1 ;

FIG. 3 is a rear elevational view showing the design for the heating device of FIGS. 1, 8, 10, 12, 14, and 16 ;

FIG. 4 is a left side elevational view showing the design for the heating device of FIGS. 1, 8, 10, 12, 14, and 16 ;

FIG. 5 is a right side elevational view showing the design for the heating device of FIGS. 1, 8, 10, 12, 14, and 16 ;

FIG. 6 is a top plan view showing the design for the heating device of FIGS. 1, 8, 10, 12, 14, and 16 ; and

FIG. 7 is a bottom plan view showing the design for the heating device of FIGS. 1, 8, 10, 12, 14, and 16 ;

FIG. 8 is a perspective view of a second embodiment of a heating device showing our new design; and

FIG. 9 is a front elevational view showing the design for the heating device of FIG. 8 ;

FIG. 10 is a perspective view of a third embodiment of a heating device showing our new design; and

FIG. 11 is a front elevational view showing the design for the heating device of FIG. 10 ;

FIG. 12 is a perspective view of a fourth embodiment of a heating device showing our new design; and

FIG. 13 is a front elevational view showing the design for the heating device of FIG. 12 ;

FIG. 14 is a perspective view of a fifth embodiment of a heating device showing our new design; and

FIG. 15 is a front elevational view showing the design for the heating device of FIG. 14 ;

FIG. 16 is a perspective view of a sixth embodiment of a heating device showing our new design; and,

FIG. 17 is a front elevational view showing the design for the heating device of FIG. 16 .

The broken lines shown in the drawings illustrate portions of the heating device that form no part of the claimed design.