How do modern dishwashers take way longer to run and clean better yet use less energy and water?

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How do modern dishwashers take way longer to run and clean better yet use less energy and water?

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The vast majority of the energy that a dishwasher uses goes towards heating the water. The sprayer pumps use very little power in comparison.

So the best way to reduce the overall energy consumption is to lower the water temperature, which makes the cleaning cycle take longer, but that’s fine because only the low power pumps are running during that time.

edit: The same idea applies to washing machines, by the way.

Also a huge improvement in modern dishwashers is the design. Most of the old crap is either plastic or metal with nearly zero insulation. Modern dishwashers are typically steel tube with a rubber tar like layer melted onto it, and then also come with actual insulation on the outside to aid in heat loss reduction. Also keeps the noise down better.

Next is by design it uses less water, which is good. However the old gel dishwasher detergent is extremely bad, as water saving units do not drain enough water to get that gel crap out of your drain lines, which in term causes pump failure. Only use pods or powder.
Edit, I mean pods which have a small amount of gel, and the rest are powder. Thought I should clarify.

Fun fact, dishwashers use about the same amount of water in 2-3 minutes of washing by hand.

It’s all to do with efficiency, newer models are more efficient but run slower, heat less water at lower temps (sometimes)
Think of a car doing 100mph, it would take 1 hour to go 100miles and say it burns 5 gallons of fuel (20 mpg)

If the car ran at 50mph it would take 2 hours but might get 40mpg so would only use 2.5 gallons.

Same job done, it took longer but was cheaper.