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This part attaches to the inner door panel.
This part is located at the bottom of the dishwasher and is not designed to heat the water that enters it. Rather, it's designed to maintain the heat of the water that enters the dishwasher.
Water that fills your dishwasher lifts this float, and when it reaches a certain level, it acts as a trigger for the float switch. The float triggers the float switch to shut off, thereby shutting off the flow of water into the dishwasher.