Heater

FIG. 1 is a front, right and top perspective view of a heater, showing our design.

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

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof.

FIG. 9 is an enlarged view of detail 9 in FIG. 1 .

FIG. 10 is an enlarged view of detail 10 in FIG. 2 .

FIG. 11 is an enlarged view of detail 11 in FIG. 2 ; and,

FIG. 12 is an enlarged view of detail 12 in FIG. 2 .

The broken lines depict portions of the heater that form no part of the claimed design. The dot-dash broken lines in FIGS. 1 - 2 and 9 - 12 depict the boundaries of the enlargements that form no part of the claimed design.