Bird Bath Heater

FIG. 1 is a top, front and left side perspective view of a bird bath heater showing my new design;

FIG. 2 is a bottom, rear and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a right side elevational view thereof.

The broken lines shown in the drawings illustrate portions of the bird bath heater that form no part of the claimed design.