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Comment by Scoundreller | Hacker News Reader

My belief is that manufacturers use the same heating elements between europe (240V, but often piped to the cold water line) and North America (120V, but usually piped to the hot water line).

No matter what, North American dishwashers will only be able to draw 1500w, and probably less because they're not always on a dedicated circuit, and have other power needs than just heat. So it's probably not a "cheap diswasher" vs expensive one issue.

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The amount of water heated up in each cycle is small enough that 1500W is not the limiting factor. Maytag recommends connecting to the hot water outlet and recommends a minimum temperature of 120F [1].

The Miele user manual for their USA models recommends connecting to the cold water inlet unless the hot water is known to be heated by a very efficient source [2].

[1] https://producthelp.maytag.com/Dishwashers/Product_Info/Dish...

[2] https://media.miele.com/downloads/05/c4/00_96106053F20B1EDDB...

> recommends connecting to the cold water inlet unless the hot water is known to be heated by a very efficient source

Huh? How does it matter to the dishwasher?

It doesn’t. They just assume that the user is looking for the most efficient solution. There are pros and cons though. The delicate crystal cycle uses a very low temperature and will only work with cold water. Some of the faster cycles will only be as fast as claimed if the supplier water is already hot.

I haven't checked code - but since my wiring had the dishwasher and garbage disposal shared on a single 20A, I would expect that each now have a requirement to not consume more than 1200W.

At 1200W and a 2.5 gallon wash cycle, I'd expect heating from 70 to 130F would take about 20 minutes. Unless the pre-rinse cycle was extended, I would expect this would mean the soap was released at the start of the wash cycle before the water was to temperature.

I’ve seen no models that are the same across the US and EU market, do you have any evidence for this?

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