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We at Toiletable love a good one-piece toilet. They are easy to install, clean, and maintain. The Kohler Kathryn is another Kohler great, with its lovely trapway and impressive flushing strength.
Be sure to check out the extended features list and the product documentation all right below!
The Kohler Kathryn Toilet Full Review of 2025
Our team hand selected the Kathryn toilet for this review along with gathering facts.
“The Kathryn cares about its users. With its Comfort Height, elongated bowl, and Quick-Release seat, this model wants to make the bathroom experience as quick and easy as possible.”
Pros and Cons
1.28 GPF with Revolution 360 swirl technology
Quiet Close seat included
ADA compliant
Limited color selection
Lever type isn’t for everyone
Feature List
Flush Specs
› Flush System –AquaPiston
› Water Consumption – 1.28 GPFGallons Per FlushEfficient toilets use 1.28 gallons per flush, saving 20% more water than 1.6 GPF toilets.
› Type – SingleFlush Type ExplainedA single flush is one press of the lever for a full flush. A dual flush allows the option for a partial or full flush.
› Flush Score – 1000 MaPWhat is MaP?Grams of waste removed in a single flush. Scale = 0 - 1000
Design & Style
› Style – One-PieceStyle ExplainedTwo-piece toilets has a separate tank and bowl. One-piece toilet has a seamless design of the tank and bowl.
› Bowl Shape – ElongatedShape ExplainedElongated bowls are oval shaped and 2” inches wider than round bowls
› Bowl Glaze – N/A
› Trapway Style – Exposed
Dimensions
›Toilet Measurements – 28″ x 17-1/2″ x 28-5/8″
› Rough-inWhat is a Rough-in?Measurement between center of waste pipe and wall – 12″
› Trapway SizeWhat is a Trapway?S-shaped curved channel inside the base of the toilet. Waste travels from the bowl through the trapway, then out the bottom of the toilet. – 2-1/8″
› Seat HeightWhat is the Seat Height?The measurement from the floor to the top of the toilet seat. Standard height toilets measure between 15 - 17 inches, while chair height toilets measure 17 inches or more. – 17-1/8″
The Kathryn has a precision-engineered tank, bowl, and trapway that harnesses the power of gravity to create an extra-strong siphon. Revolution 360 swirl flushing technology streams water all around the bowl so no grime or streaks are left behind.
The high-quality AquaPiston canister optimizes flush performance by requiring a lower actuation force than a traditional flapper. The canister’s design has 90% less exposed seal material than a three-inch flapper, reducing the chance of leakage. The toilet’s flush valve also has a 3:2 ratio that further increases flushing strength.
At 1.28 gallons per flush, this unit saves you thousands of gallons a year, when compared to traditional 1.6 GPF units. Saving thousands of gallons means hundreds of dollars off your annual water bill. Nowadays it’s hard to find things that are both cost-effective and eco-friendly, but this EPA WaterSense-certified toilet has you covered.
Smart Design
Take a look at the Kathryn’s beautiful concealed trapway. The unique octagon shape effortlessly compliments the toilet’s slightly angled tank. The toilet’s faux-crown molding gives it a classic feel while also maintaining a modern touch. We recommend this toilet for traditional bathrooms, as the toilet would be at home amidst a tiled backsplash and large mirrors.
One of the Kathryn’s most defining features is its ADA-compliance. The toilet stands at 16 ⅜” and has an elongated bowl. ADA-compliant toilets are excellent for all users as they make units more accessible to those in need of extra assistance while sitting or standing up.
Elongated bowls provide an extra layer of comfort by dispersing user body weight when sitting. This model’s elongated bowl takes up the same amount of space as a round bowl so you can have a better bathroom experience without sacrificing space!
The Kathryn has a concealed trapway, eliminating any little spaces where dirt may accumulate. The toilet’s Clean Caps low-profile bolt caps facilitate easier cleaning as they’re easily removable and simple to reinstall.
The Kathryn is available in white, biscuit, and black black. The toilet comes with a left-hand polished chrome trip lever. From our perspective, the trip lever is a bit strange. Instead of pushing down like a traditional lever, this one requires you to pull upwards. While it’s not that big of a difference, it’s worth mentioning.
Another feature that we love about this unit is that it comes with a toilet seat. Oftentimes its tough to find an affordable toilet that comes with a seat – let alone a good one. The Kathryn comes with the Quiet Close compact elongated seat. So long are the days of annoying seat slamming and cracking! The seat’s Quick-Release functionality also makes the seat easy to remove – an extra perk during cleaning.
Color Options
White (0)
Biscuit (96)
Black Black (7)
Seat Options
K-4108 PureWash® E750 Elongated bidet toilet seat with remote control
K-75796 Cachet Nightlight Quiet-Close™ elongated toilet seat
Although many reviews aren’t available for the Kathryn, the ones posted praise the toilet’s compact size which makes it a perfect fit for small bathrooms. Other positive reviews talk about the toilet’s easy-to-clean one-piece structure.
One user had a negative experience upon delivery by receiving mismatching parts, however, this was solved after a quick call to Kohler’s customer service.
