The four dishwashers rated quietest by Consumer Reports in 2014 include the Kenmore Elite 12793 at 39 decibels, the Kenmore Elite 12783 at 43 decibels, the KitchenAid KDFE454CSS at 40 decibels and the Thermador Topaz Series DWHD640JFM at 48 decibels. The quiet quotient is determined during fill, wash and drain.
Bosch reports its 24-inch bar handle dishwasher, model SHX9PT75UC, as the quietest at 38 decibels, certified by an independent lab. In addition, its dishwashers exceed Energy Star compliance standards by 14 percent. Miele, Jenn-Air and Gaggeneau also make dishwashers in low-decibel ranges. As a matter of decibel comparison, the sound level during a normal conversation is 60 decibels, a lawnmower registers at 90 decibels and a firecracker reaches 140 decibels.