Sure temp water heating feature says you can lower your hot water tank to 120 degrees. That's great for the first fill, whether it be the prewash or first main wash, depending on the cycle selected. What about the rest of the washes and rinses? My KDS 20 only heats the first fill, as indicated by the water heating indicator, and so does my Mom's KDS 22. You can get a heated last rinse if you select the sani rinse.
I sure keep my tank at 140 degrees! Beside that, I still think that series of KS's were fabulous. Excellent cleaning, and the 22 has tons of sound insulation, you can barely hear it.
Bobby in Boston