The ornamental design for an electricbaseboardheater, as shown and described.
FIG. 1 is a perspective view of an electric baseboard heater showing my new
design;
FIG. 2 is a side elevational view thereof.
The rear and bottom surfaces of the electric baseboard heater are
substantially planar and unornamented. The side not shown is a mirror
image of the side shown in FIG. 2.