There are many different ways to answer this. Basically every toilet on the market flushes about the same if we’re talking about gravity flush. Yes we all know those toilets in the movie theater and the ones in the airport are noisy. You don’t have to worry about buying one of these. They are commercial toilets and not made for use in residential applications. Now there are a few toilets on the market that are a little bit quieter than the average gravity flush. Kohler makes a Power-Lite toilet that is extremely quiet and companies like Porcher, Toto and Duravit make toilets that are also a little bit quieter. For the most part, toilets that flush quietly are going to be about 3 to 8 times more expensive! If you have any further questions you can e-mail our retail department.