Manufacturers indicate the noise level of a model in decibels and average the readings over the entire dishwasher cycle. However, this is not necessarily the best indicator of noise development. That's why the CR jury sits down and listens to every dishwasher we test through its cycle, even if it's three hours.
"People remember a sound when it's louder," says Ciufo. "An average doesn't take that into account, but our rating takes into account the noise spikes observed by our judges."
As for the other critical components of the dishwasher, our testers rate them based on the results of several processes, starting with loading 10 place settings, consisting of white ceramic plates, with cooked food. We let the load on each model follow a normal cycle with high heat settings and heated drying options.
We record the time it takes for each cycle, as well as the amount of water and energy consumed. We even went so far as to use photographic imaging technology to assess the resulting cleanliness of each dish.
All the activity of a dishwasher can create a lot of noise. Ciufo ticks off a list of culprits, including splashing water, running water, and the sound of the drain pump running.
"Self-cleaning filter dishwashers tend to be noisy when the grinder is busy grinding food," he says. "If you don't mind the extra hassle of cleaning the filter, a manual cleaning filter is a good option. Cleaning takes a minute or two.
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