The ornamental design for a variableheightbathtub, substantially as shown and described.
FIG. 1 is a perspective view taken from the top, one side and one end of a
variable height bathtub showing my new design, the opposite side and end
being the same as the side and end shown;
FIG. 2 is a perspective view taken from the top, one side and one end
thereof, showing the bathtub in a raised position; and