The quietest type of dishwasher are those that are made with excellent quality of insulation and sound dampening material, says Josh Cadenhead of Yale Appliance. One way to measure a dishwasher's sound level is its decibel rating. Dishwasher models with a rating of 41 to 50 decibels are virtually silent.
As of June 2014, the Miele G5915SCISS/SS and Bosch SHX9PT75UC are rated by Yale Appliance as among the quietest dishwasher in the market with a noise rating of 38 decibels. Another quiet dishwasher as of October 2014 is the Kenmore Elite 12793 with a 39 decibel noise rating, according to ProductReportCard.com.