While this is a great dishwasher it does not heat it's own water. Water temp of at least 140 has to be provided. I think Laundress mentioned that the hot water in his building is set lower in the summer months. It might be too low for proper cleaning. It's worth looking into, though, as these are great dishwashers.
Interesting to note that this machine has a heating element inside the tub for drying, and it also maintains water temp (but does not raise it). Only the built-in & portable Superbas had this feature as well.