[LUmBULtERA]

For my new Bosch Benchmark dishwasher, "normal" actually uses 2.4 gallons and 1.25 kwh a load, is most efficient, and is quietest. There is no "eco" mode. "Auto" mode uses about twice the gallons no matter what's inside and slightly more kwh.

[ornornor]

Maybe it’s a European thing. The eco program is the one mandated by law and the one they use for the energy rating.

But for machines that have a table showing power and water use, it’s never the most efficient one (in all the ones I checked). There is always a better program, it’s usually called “auto”.

Maybe it’s different in North America, idk what the rules are there.

[matthewmacleod]

I've heard this before (and I don't have any reason to doubt your research) but I'm struggling to figure out why it would be the case.

Regulation 1016/2010 (https://eur-lex.europa.eu/eli/reg/2010/1016/oj/eng) is the thing that establishes the various requirements for home dishwashers. It's pretty straightforward (most of the content establishing how efficiency is calculated). It basically just requires the default program to be "suitable to clean normally soiled tableware and that it is the most efficient programme in terms of its combined energy and water consumption for that type of tableware".

I could imagine some issues with how these numbers are calculated that reward "less efficient" devices or something like that, but it's pretty hard to figure out what that could be. Bit of a mystery!

[giantg2]

Seems like the companies think we're too dumb in North America. My machines didn't come with any sort of tables. Someone else was saying their washing machine has actual temperature settings and RPM settings. None of the ones I've seen here tell us that, not even in the manual.