Watch the video; it makes a huge difference even though the hot water input is not as hot as the water can get when the dishwasher runs its heating element.

Also the size of the heating element is irrelevant. What matters is the power dissipated. Most dishwashers in the US will use only about 900 watts of power even when plugged into a circuit that supports 1500 watts. In the EU they often hit 3000 watts. Even when just heating up a gallon or two of water that makes a huge difference.

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seanmcdirmid 5 hours ago | parent [-]

Modern dishwashers, especially in Europe, are using heat pumps as well. They don’t really benefit from the extra voltage and watts anymore.

	▲	db48x an hour ago \| parent [-]
		Sure, but most people don’t have a modern dishwasher. It’s an appliance that lasts 20 to 30 years ergo most people have old dishwashers that were manufactured decades ago.