The ornamental design for a waterheater, as shown and described.
FIG. 1 shows the right frontal perspective of the water heater;
FIG. 2 shows left frontal perspective of the water heater;
FIG. 3 shows frontal view of the water heater;
FIG. 4 shows rear view of the water heater;
FIG. 5 shows left side view of the water heater;
FIG. 6 shows right side view of the water heater;
FIG. 7 shows bottom view of the water heater; and,
FIG. 8 shows top view of the water heater.
The broken lines shown in the drawings are included for the purpose of illustrating portions of the article that form no part of the claimed design.
This invention refers to the industrial model of a water heater, which is totally different to those already known, characterized by its special shape and adornment that give it a particular and peculiar appearance.