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The Kohler Harken Toilet Rated in 2025 – Toiletable

Last updated: Nov 25th, 2024 by Tyler White

 Note: We’re supported by our readers. We earn a commission from product purchases using affiliate links on our site. You help keep us growing! 

In this reivew, we are introducing the Kohler Harken toilet. This Kohler toilet features a Class Five® flush technology and uses only 1.28 gallons per flush.

We have listed all the features, product documentation and even looked into the customer reviews and manufacture facts for you to make the best judgement of the Kohler Harken toilet yourself!

Enjoy the review below and be sure to check our vast resources and how-to guides too.

The Kohler Harken (Full) Toilet Review of 2025

Our experts reviewed and collected facts about the Harken toilet all right below!

Infographic for Kohler Harken toilet with dimensions and details: 15.69" width, 28.62" length, 16.5" seat height, and 1.28 GPF.

“At Toiletable, we are no stranger to Kohler toilets. We love the Harken because of its funky design, smart flushing technology, and comfortable design.”

Pros and Cons

  • 1.28 GPF
  • Unique design of tank and trapway
  • Quiet Close Seat included
  • Expensive when compared to more affordable yet decked-out Kohler toilets
Feature List

Flush Specs

  • › Flush System –   Class Five®What is a Class Five® Flushing System?The Class Five® Flushing System features a robust canister flush valve and a large trapway, delivering a powerful and efficient flush that reduces clogs and enhances bowl cleanliness.
  • › 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 –  Concealed

Dimensions

  • › Toilet Measurements – 28-13/16″ x 15-11/16″ x 26-13/16″
  • › 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. – 16-5/16”
    › Rim Height – 15-9/16″
See toilet dimensions
Technical diagram of a toilet with measurements indicated in both inches and millimeters for various dimensions. Diagram of a toilet with various measurements in both inches and millimeters.

 

CHECK – HOME DEPOT PRICE             CHECK – AMAZON PRICE

Kohler Harken toilet with Comfort Height, 1.28 gallon flush, left handle, Quiet-Close seat, and skirted trapway. This one-piece toilet is eco-friendly and reliable.

Flush Power

The Harken is a one-piece, compact elongated toilet with a 1.28 gallons per flush (GPF) rating, which is considered a standard flush rate. The toilet has the highest MaP score possible of 1,000 grams.

The toilet utilizes Kohler’s Class Five® flush technology. Using a piston-like action to push water into the bowl, the toilet’s flushing system creates a more efficient and effective flush. The system uses a canister design that allows water to flow into the bowl from all sides, which helps to keep the bowl cleaner and reduces the potential for clogs.

The toilet’s larger flush valve allows more water to enter the bowl faster and provides a more powerful flush as well.

Design

The compact elongated bowl shape of the Harken is designed to save space without compromising comfort. The Harken is not ADA-compliant but has a seat height of almost 16-5/16” which is relatively comfortable for most adults.

The Harken comes with a left-hand polished chrome trip lever that needs to be pushed up to be activated. It’s a small detail that we think makes the Harken a little bit more unique. That being said, the whole toilet’s design is very distinct.

Notice the toilet’s wide, rounded tank which seamlessly flows into the toilet’s skirted trapway. The crown molding at the top of the tank and at the bottom of the trapway brings the whole piece together wonderfully.

Image showing a bathroom with a Kohler Harken toilet, a close-up view, and a side profile of the same toilet. Another bonus – the toilet’s skirted trapway makes it extra-easy to clean, as bacteria doesn’t have anywhere to go.

The Harken comes with a Quiet Close Seat, so no more annoying toilet seat slamming when you’re in a rush.

Though this is a bonus that many toilets don’t include, the Harken’s price is a bit expensive for what you get. For the cost of this toilet, we think you would be able to get more features, such as a deodorized seat or a dual flush mechanism, like the Kohler Highline. Nevertheless, the Harken is a solid unit that delivers on all its promises.

The toilet only comes with white and requires a 12” rough-in. A supply line can be purchased separately.

 

 

 

Color Option

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  • white
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Seat Option

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  • K-20110 Brevia™ Quiet-Close™ elongated toilet seat
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Product Documentation

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  • Spec Sheet (PDF)
  • Manufacturer Product Listing
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READ REVIEWS

Summary of Customer Reviews

Positive reviews boast about the toilet’s flushing performance, noting how the efficiency of the toilet’s suction power and refill rate.

Users also love the sleek look of the toilet that compliments all bathroom aesthetics.

The most common complaint is the toilet’s price. Users note they wish they received more bang for their buck.

Category iconKohler,  Toilets

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