Oil heater
FIG. 1 is a front, top and right side perspective view of an oil heater showing our new design; 
     FIG. 2 is a rear, bottom and left side perspective view thereof; 
     FIG. 3 is a top plan view thereof; 
     FIG. 4 is a left side elevational view thereof; and 
     FIG. 5 is a right side elevational view thereof.