The ornamental design for an electricstorageheater, as shown and described.
FIG. 1 is a front elevation view of the electric storage heater;
FIG. 2 is a perspective view of the front and one side thereof;
FIG. 3 is a rear elevation view thereof; and
FIG. 4 is an enlarged perspective view of the front and opposite side
thereof, with the top control cover raised and in open condition, it being
understood that the heater has been broken away in the middle for
convenience of illustration.
The bottom of the electric storage heater is flat and unornamented.