Heater

FIG. 1 is a front view of a heater in accordance with the present disclosure; FIG. 2 is a view of the heater shown in FIG. 1 from the rear; FIG. 3 is a view of the heater shown in FIG. 1 from the left; FIG. 4 is a view of the heater shown in FIG. 1 from the right; FIG. 5 is a view of the heater shown in FIG. 1 from the top; FIG. 6 is a view of the heater shown in FIG. 1 from the bottom; and, FIG. 7 is a perspective view of the heater shown in FIG. 1 The broken lines shown in the drawings are included for the purpose of illustrating portions of the heater that form no part of the claimed design.