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