Heating device
FIG. 1 is a top plan view of a heating device showing my new design; 
     FIG. 2 is a front elevational view thereof; 
     FIG. 3 is a left end elevational view thereof, the right end being the mirror image; 
     FIG. 4 is a perspective view taken from the bottom and side thereof; and, 
     FIG. 5 is a perspective view taken from the bottom and side thereof, tilted backward from the position shown in FIG. 4.