This guide is designed to demystify some of the questions buyers might have as they strive to find the quietest dishwasher available.
As recently as a decade ago, noise concerns when it came to dishwashers were not at the top of manufacturers’ minds or indeed the minds of consumers. Dishwashers were simply known as loud appliances, nearly all of them rising above 60 db or louder. (This is the approximate volume of a propeller plane flying overhead.) The sound of a dishwasher could be heard throughout the house, and it seemed that this was simply the way things would always be.
Ushering in a New Era of Quiet
In the early 2000s, manufacturer Bosch changed everything with an advertising campaign that touted their brand as the quietest in the world. Suddenly, brands throughout the market were scrambling to find ways to make their dishwashers quieter, and consumers took notice.
Today, consumers list noise concerns as their number-one decision point when it comes to choosing a dishwasher. But most consumers are unclear about decibel ratings and how various brands and models compare when it comes to noise.
What does the decibel rating on a dishwasher mean?
Manufacturers love to use decibels to describe the noise levels of their machines. But the funny thing is, most of us have no idea how loud decibel levels are or how they compare. Manufacturers simply assume that if they advertise a decibel level with enough vibrancy and excitement, consumers will assume it’s an impressive figure. Then they have the dishwasher installed only to find out they can hear it from their bedroom. So let’s talk a bit about decibels when it comes to dishwasher ratings.
Decibels are a unit of measurement that is what mathematicians call logarithmic, meaning it goes up in powers of ten. That meanswhich means that a decibel number that’s 10% higher than another isn’t going to be 10% louder. For example, a 70db sound is actually twice as loud as a 60db sound.. A 50db sound is one-fourth as loud as a 60db sound. You get the picture.
How many decibels is a quiet dishwasher?
When it comes to dishwashers, it’s important to note that all modern models are now quieter than 60db. At the very least, we recommend finding one that’s 50db or quieter. (Remember, this is a quarter the volume of 60db.) 50db is roughly the noise level of a quiet conversation, and we have found that it’s usually more than quiet enough for most people. However, an open floor plan kitchen might have you looking for something even quieter, and those options are available.
Having said that, the truth of the matter is that paying extra for anything below 44db is a waste of money unless you plan on sleeping in your kitchen every night. We’re talking about the volume of a library, so if a brand claims that anything lower than 44db is the only acceptable volume—ignore them. At 44db you may still hear a very slight noise coming from the dishwasher so if you are extra sensitive to sound there are models available as quiet as 38db. But for most homes this will be overkill.
What Makes a Dishwasher Quiet or Loud?
The factors that go into determining how loud a dishwasher will be while running are numerous and diverse. The main sources of noise within a dishwasher are the movement of water through the water pump, the drain pump removing water from the space, water moving and bouncing off of surfaces within the dishwasher including the wash tubs and plates, and the movement of dishes within the device. Units that utilize a hard food disposal system tend to be louder, as well.
That being said, manufacturers have found effective ways to minimize the amount of sound that is produced and how much of that sound escapes the dishwasher. Some of these design innovations involve the washing process itself, using quieter pump systems and variable speeds that keep the dishwasher from constantly running at full power (and full volume).
Another tactic manufacturers use is to add insulation around the unit to keep noise from escaping. This helps keep any sounds isolated to the inside of the dishwasher.
Brands and Volume
Comparing brands when it comes to their decibel claims can be tough, because there is no standardized practice for measuring noise levels. This means that one company could be measuring at a distance of one meter while another is conducting tests from across a warehouse This means that one company could be measuring at a distance of one meter while another is conducting tests from across a warehouse, or in a different type of room. This makes decibel level readings misleading. Your only truly safe bet is when making relative comparisons between models offered by the same brand, because they at least can be expected to use the same noise testing methods.
Bosch and Miele are two brands who have been battle-tested and shown to have the best noise ratings across the board, so these two are always a safe bet. If you’re ever in doubt, ask around to see if any friends or family members can vouch for a certain model’s volume level. This is much better than taking brand’s claims at face value.
Quietest Dishwasers of 2018 by Manufacturer
- Bosch SHP865WD5N 500 DLX Flush Handle Dishwasher at 44 dB
- Bosch SHX878WD5N 800 DLX Series Dishwasher w/Bar Handle at 44 dB
- Bosch Benchmark SHE89PW55N 24" Dishwasher, Recessed Handle, Water Softener, Interior Lights at 39 dB
- Bosch Benchmark SHV89PW73N 24" Dishwasher, Water Softener, Interior Lights at 38 dB
- Miele G4948UCLST Futura Classic Plus Dishwasher at 46 dB
- Miele G4228SCUSS Futura Classic Plus Dishwasher, Cutlery Tray, Express Cycle at 46 dB
- Miele G6665SCVISF Futura Crystal Dishwasher, Hidden Controls, 3D Cutlery Tray at 45 dB
- Miele G6745SCUCLST Futura Dimension Dishwasher, Auto Open at 39 dB
- Miele G6875SCVISF Futura Lumen Dishwasher, Interior Lights at 38 dB
- Blomberg DWT58500SS 24" Dishwasher, 3rd Rack, Tall Tub at 45 dB
- Blomberg DWT25502SS 24" Tall Tub Dishwasher at 48 dB
More and more manufacturers are developing quiet dishwasher models, however Bosch and Miele are two brands who have been battle-tested and shown to have the best noise ratings across the board, so these two are always a safe bet. If you’re ever in doubt, ask around to see if any friends or family members can vouch for a certain model’s volume level. This is much better than taking brand’s claims at face value.