The ornamental design for a resistivewaterheaterelement, as shown and described.
FIG. 1 is a side view of a resistive water heater element showing my new
design, wherein both sides of the resistive water heater element are the
same;
FIG. 2 is a top view thereof;
FIG. 3 is a bottom view thereof; and,
FIG. 4 is a perspective view in the intended environment.
The broken-line showing of environmental structure in FIG. 4 is for
illustrative purposes only and forms no part of the claimed design.