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Internet # 306031834

Model # K-21285-0

Store SKU # 1003425977

Elmbrook 12 in. Rough In 2-Piece 1.28 GPF Single Flush Elongated Toilet in White Seat Not Included

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  • Easy to install with included slow-close toilet seat ($30 Value)
  • KOHLER AquaPiston releases water from 360 degrees around
  • Comfort Height offers chair-height seating (about 2 in. taller)
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Product Details

About This Product

A perfect blend of traditional and contemporary design, the Elmbrook toilet complements a full range of bathroom styles. Beveled edges and simple lines enhance its distinctive profile. An innovative 1.28 GPF setting provides significant water savings of up to 16,500 Gal. per year, compared to an old 3.5 Gal. toilet, without sacrificing flushing power. This Complete Solution package includes everything necessary for installation.


  • Get inspired by shopping the Kohler Bathroom
  • 2-piece toilet
  • Elongated bowl offers added room and comfort
  • Comfort height feature offers chair-height seating that makes sitting down and standing up easier for most adults
  • 1.28 Gallons Per Flush (GPF)
  • 2-1/8 in. glazed trap way
  • Complete solution toilets provide everything you need in 1 box, including bowl, tank, slow-close toilet seat, cover, wax ring and floor hardware, supply line not included
  • Standard left-hand polished chrome trip lever included
  • Quiet-Close elongated seat allows seat to close quietly
  • Coordinates with other products in the Elmbrook collection
  • Single-flush gravity uses the force of gravity and a precision-engineered tank, bowl and trap way to create a strong siphon during flushing
  • AquaPiston canister allows water to flow out of the tank from all sides (360 degrees), increasing the power and effectiveness of the flush
  • Standard 12 in. rough-in
  • 2-bolt installation
  • Flush valve's 3:2 ratio harnesses the natural force of gravity and optimizes flush performance
  • Durable canister design has 90% less exposed seal material than a 3" flapper for leak-free performance
  • Light-touch canister flush requires a lower actuation force than a flapper
  • The Best Toilet For Your Home
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Product Information

Internet # 306031834

Model # K-21285-0

Store SKU # 1003425977


Dimensions: H 30.0625 in, W 18.3125 in, D 29.25 in


Bowl Height without Seat (in.)


Flush Valve Size (in.)


Product Depth (in.)

29.25 in

Product Height (in.)

30.0625 in

Product Width (in.)

18.3125 in


Bowl Height

Chair Height

Bowl/Seat Shape


Color Family




Commercial / Residential



No Additional Features

Flushing Technology

Gravity Fed

Flushing Type

Single Flush

Gallons Per Flush


Gallons Per Flush

Single Flush: 1.28

Handle Location



Complete Kit

MaP Performance Rating

Not Rated


Vitreous China

Mount Location

Floor Mount

Product Weight (lb.)

109 lb



Rough In Size

12 inch Rough In

Seat Front Type


Toilet Type


Trapway Diameter (in.)


Trip Lever Location

Left Front

Warranty / Certifications

Certifications and Listings

ADA Compliant, CSA Certified, EPA Approved

Manufacturer Warranty

One-Year Limited Warranty

Questions & Answers

Q:I was wondering if the tank can be bought separately.
by|Apr 3, 2024
1 Answer
Answer This Question

A:  Hi Terri, this is Sarah with Kohler Customer Service. I am glad to address your question. The tank is not sold separately. For further assistance, please call our team at 1-800-4KOHLER (M-F; 8am-5pm CST). Thank you for choosing Kohler.

by|Apr 3, 2024
    Q:What is rough in size?
    by|Apr 1, 2024
    1 Answer
    Answer This Question

    A:  Hello, this is Sarah with Kohler Customer Service. I am glad to address your question. This toilet features a 12" rough-in. Thank you for choosing Kohler.

    by|Apr 3, 2024
      Q:2 curent gerber 2 pc elongated toilets wall depth about 27 in. i was looking at your elmbrook which shows as 29.5 do you have any that will work
      by|Dec 22, 2023
      1 Answer
      Answer This Question

      A:  Hi Muke, this is Sarah with Kohler Customer Service. I am glad to address your question. We recommend looking at the Highline Classic round-front toilet which features a 17-3/4" toilet depth with a 1" gap between the tank and wall. Dimensions can be seen on page two of the specification sheet: https://shorturl.at/hlnru. Thank you for choosing Kohler.

      by|Dec 23, 2023
        Q:Is there an adjustment on the tank level.
        by|Aug 13, 2023
        0 Answer
        Answer This Question
        Showing 1-4 of 471

        Customer Reviews

        4.5 out of 5

        • 4.5 out of 987 reviews
        • 85% recommend this product
        Filter by:
        Showing 1-10 of 987 reviews
        Poor design
        I bought this toilet a month ago not realizing it didn't come with a insulated tank. Now we are constantly wiping up condensation off of the floor, so much so that I thought the toilet was leaking. Why wouldn't all toilets come with a lined tank????
          Leak issue
          It leaks from the gasket area, it could be a crack from the bottom but water keeps coming out after flashing.. I tried to reinstall it but same thing happens..
          Response from KOHLER Customer ServiceDec 30, 2022
          Hello Mitchell, my name is Meli with Kohler Co. I am sorry to read your Elmbrook toilet is leaking. We would like to connect directly to assist with your installation, please email our customer care team at KohlerCustServ@Kohler.com. We look forward to hearing from you and helping you resolve this issue. Sincerely, Meli A., Kohler Customer Service
            Flushes well and very quiet
            Flushes well most of the time but could take two flushes if too much toilet paper used
            • Verified Purchase
            • Recommended
            New design is worse than old design
            I bought this toilet a few months ago and I have been unhappy with the design. It doesn't flush as completely and cleanly as the old design which I also have; it leaves solid waste stains each time unlike the old design. The idea of using less water is a good one but please improve the design further to ensure the toilet stays clean after each solid waste flush. I'm so unhappy with it and wish I could return it for a refund.
            Response from Customer Service Jan 4, 2022
            Alpinehill2, my name is Jessica with Kohler Co. I am sorry to hear you're having trouble with your Cimarron toilet. The chain connecting to the trip lever should be taut. If there is any slack, it should be tightened to remove the slack. The water level can also be checked. The water level in the tank should be at the water line which is marked on the inside back wall of the tank or on the flush valve. The refill tube can be checked as well. It should be connected at both ends connecting the fill valve to the center of the canister valve. If either end is disconnected, it should be pushed back into place. If the issue continues once the above has been verified, please contact our Customer Service team at 1-800-456-4537. We look forward to hearing from you soon. - Jessica P. Kohler Customer Service.
              Our First Kohler
              Has been eyeing the item for a while now and decided to buy in November 2021... I was surprise how big and heavy the package, so I said this must be a good toilet... Upon opening the package I was very impressed... Here's the breakdown based on the experienced with the toilet... LIKE: Packaged very well AquaPiston Canister Flush Valve makes flushing effectively Very good design from bowl to tank Very easy to install Comfortable Height Tank mounting bolt not exposed to water, never worry about rusted bolts or replacing Slow-close seat Everything fits very well DISLIKE: Wax ring!!! Not a fan if it's a cancer causing material as noted in the packaging The seat did not come with Quick-Release, but manual indicated that it's a quick release for easy cleaning!
                • Recommended
                Hello, I purchased this 3-pack of Kohler Elmbrook toilets for my home. These toilets are awesome....
                Hello, I purchased this 3-pack of Kohler Elmbrook toilets for my home. These toilets are awesome. The aqua piston is a fantastic engineering marvel and these toilets flush perfectly once and done. Literally. I could not be happier. If you are thinking about replacing your toilets in your home, look no further than this set. These are great they even come with a slow close seat which was a nice added benefit. Everything was in the box with the exception of the water lines that need to be purchased separately. These are great buy. I have never installed a toilet before and installation was one of the easiest things I've ever done.
                • Verified Purchase
                • Recommended
                24 found this review helpful
                Aqua piston gets stuck in the up position when flushed.
                Dear Kohler, Please come get this hunk of junk out of my bathroom. This was the first toilet I ever purchased in my life and this will be the last Kohler toilet I purchase in my life. The aqua piston gets stuck in the up position. The chain is taut and the water line is at the mark. I'm extremely disappointed. What a waste of $200. Live and learn but please don't make the same mistake I did.
                  69 found this review helpful
                  12/29/30 Installed, seat does close slow!
                  First off super simple 2 peice toilet easy to install. You could get this done with a simple medium sized flat head screw driver and pliers for the flange mount nuts. I dont get why people are claiming the seat isnt a "slow close" seat cause it is. Takes about 10 seconds to close completely. The height is okay, fits me well I'm 5'7, taller folks might feel it's short.
                    • Recommended
                    8 found this review helpful
                    I love this toilet. It was reasonably priced, looks great, and works like a charm. Kohler pisto...
                    I love this toilet. It was reasonably priced, looks great, and works like a charm. Kohler piston flush technology is great, too.
                    • Verified Purchase
                    • Recommended
                    3 found this review helpful
                    RE: Kohler - Elmbrook The Complete Solution 2-piece 1.28 GPF Single Flush Elongated Toilet in Whi...
                    RE: Kohler - Elmbrook The Complete Solution 2-piece 1.28 GPF Single Flush Elongated Toilet in White, Seat Included A very nice toilet. I ordered this a couple years ago, and just got around to installing it last week. Installation was straight forward. Everything you need to install is included... seat, wax ring and hardware. Everything was in the packaging. I like the extra height to this model.
                    • Recommended
                    13 found this review helpful
                    Showing 1-10 of 987 reviews