The quietest toilets on the market include the Niagara Conservation Stealth Toilet, Toto Ultramax II and Toto Carlyle, according to the Bermuda Sun and ApartmentTherapy.com. In general, gravity-flush toilets generate less noise than pressure-flush models, as stated by Consumer Reports.
The Niagara Conservation Stealth Toilet uses 0.8 gallons of water per flush. This white china toilet is available in elongated and round silhouettes. Although the Niagara Conservation Stealth Toilet flushes quietly and uses very little water, each flush completely empties the bowl.
The Toto Ultramax II is a white elongated toilet that features the Toto Double Cyclone flushing system. This system combines gravity flushing with double suction nozzles, emptying the bowl quietly and thoroughly. The Toto Ultramax II is also an exceptionally clean toilet because of its SanaGloss coating, which resists stains and has an ultra-smooth texture that expedites cleaning.
The Niagara Conservation Stealth Toilet and Toto Ultramax II are gravity toilets. Toilets in this category flush with the aid of gravity, which pulls the water down and out of the bowl. The other major type of toilet is the pressure-flush style. Pressurized flushing forcefully evacuates the bowl. This type of toilet requires a minimum water pressure of 25 pounds per square inch, according to Consumer Reports.