Heater
FIG. 1 is a perspective view of a heater  showing my new design; 
     FIG. 2 is a front elevational view thereof; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a top plan view thereof; 
     FIG. 5 is a bottom plan view thereof; 
     FIG. 6 is a side elevational view thereof, taken from the  right of FIG. 1; and 
     FIG. 7 is a side elevational view thereof, taken from the  left of FIG. 1.