Bird bath heater

FIG. 1 is a top perspective view of a bird bath heater showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a left view thereof; and,

FIG. 8 is a right view thereof.