Kohler Highline K-3658

The Kohler Highline K-3658 is part of the Toilets test program at Consumer Reports. In our lab tests, Toilets models like the Highline K-3658 are rated on multiple criteria, such as those listed below.

Solid waste removal: A high score means the toilet effectively and consistently evacuates various types of solid waste from the bowl through the trapway and into the drainage system. A top-scoring model delivers a strong flush that helps prevent clogs and reduces the need to plunge.

Noise: A high score means the toilet flushes more quietly. A top-scoring model is better for shared spaces or nighttime use when noise matters.

Bowl cleaning: A high score means the toilet flushes away more waste from the inner surface of the toilet bowl, particularly the front and side walls where residue is most likely to remain. A top-scoring model stays cleaner with less scrubbing.