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by dwaite 1017 days ago
American dishwashers hook up to the hot water line, vs the cold water line in some other countries. They do have their own heaters, but household models are limited to 1200-1800 watts.

The pre-wash/pre-rinse cycle may only give enough time to raise the temperature 10-15 °F before the regular wash cycle starts. I do not believe they will delay the start of the wash cycle due to the water not yet being to target.

Starting with cold water reduces the effectiveness of the initial rinse, and may reduce effectiveness or prolong the wash cycle.