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Model #K-6428-0

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Memoirs Stately 1-Piece 1.28 GPF Single Flush Elongated Toilet in White, Seat Included

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  • Toilet seat included with purchase
  • KOHLER AquaPiston releases water from 360 degrees around
  • Comfort Height offers chair-height seating (about 2 in. taller)
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Product Overview

Inspired by elegant architecture and featuring crisp lines, this Memoirs collection toilet with Stately design delivers functionality and water savings-as well as traditional style. A high-efficiency 1.28 Gal. flush offers up to 16,500 Gal. of water savings per year (versus a 3.5 Gal. toilet) without sacrificing performance. The included seat, positioned at chair height for your comfort, features technology for noiseless closing and easy cleaning.
  • One-piece toilets integrate the tank and bowl into a seamless, easy-to-clean design
  • Compact elongated bowl offers added comfort while occupying the same space as a round bowl
  • Comfort height feature offers chair-height seating that makes sitting down and standing up easier for most adults
  • 1.28 GPF
  • Skirted trap-way simplifies cleaning
  • Standard left-hand trip lever included
  • Includes Glenbury Quiet-Close with grip-tight seat, does not include supply line
  • Patented readylock installation system is a simple solution for skirted toilets that saves time, hassle and eliminates the need to drill into the floor for a standard 12 in. rough in
  • Coordinates with other products in the Memoirs 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 into the bowl from all sides (360°), increasing the power and effectiveness of the flush
  • 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 in. flapper, for leak-free performance
  • Light-touch canister flush requires a lower actuation force than a flapper
  • Standard 12 in. rough-in
  • 10 in. and 14 in. rough-in kits are also available
  • Watersense toilets meet strict EPA flushing guidelines, including using at least 20% less water than 1.6 Gal. toilets
  • Eligible for consumer rebates in some municipalities

  • Features to consider when buying a toilet
  • Click here to learn more about Eco Options and Water Conservation



Bowl Height without Seat (in.)16.5Flush Valve Size (in.)3.0
Product Depth (in.)27.75 inProduct Height (in.)28.25 in
Product Width (in.)18.25 in


Bowl HeightChair HeightBowl/Seat ShapeElongated
Color FamilyWhiteColor/FinishWhite
FeaturesNo Additional FeaturesFlushing TechnologyGravity Fed
Flushing TypeSingle FlushGallons Per Flush1.28
Handle LocationLeftIncludedHandle,Hardware,Seat
MaP Performance Rating800MaterialVitreous China
Mount LocationFloor MountProduct Weight (lb.)114.5 lb
Returnable90-DayRough In Size12 inch Rough In
Seat Front TypeClosedStyleClassic,Modern
Toilet TypeOne-PieceTrapway Diameter (in.)2.125
Trip Lever LocationLeft Front

Warranty / Certifications

Certifications and ListingsADA Compliant,CSA CertifiedManufacturer WarrantyOne year limited warranty

Questions & Answers

Typical questions asked about products:

  • Is the product durable?
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Customer Reviews

  • 4.5
    out of 28 reviews
  • 100%recommend this product
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Showing 1-10 of 28 reviews
Black Toilet - Great to keep clean as one piece.
My husband wanted a black toilet and purchased this toilet. I was resistant to black at first - but it really makes a statement in the room with all the black finishes (faucets / showering / accessories). Also like the 1 piece toilet as it's easy to clean!
    • Recommended
    This is a very nice looking toilet. It has the larger flush diameter which means it flushes well...
    This is a very nice looking toilet. It has the larger flush diameter which means it flushes well. The installation of this type toilet is a little difficult compared to a standard toilet. I would highly recommend you have a professional do the installation. You start buy installing the wax ring, and then install the trap assembly. (most toilets the trap assembly is molded into the toilet.) Then the toilet just sits down over top of the trap assembly and kind of has a friction type fit. Then you put a screw in from either side to hold it to the floor. Surprisingly this was a very sturdy mounting system. Probably my biggest problem installing the toilet was putting the seat on. There is a very shallow space to fit the nut in to screw the set to. My hands were just to big to fit in there to hold the nut. One other note is since this is a one piece toilet , meaning the tank and bowl are one unit, it is much heavier than installing a normal toilet.
    • Recommended
    3 found this review helpful
    Could not be more pleased! A great product!
    Good looking, it works. This is a very elegant design for toilet, clean crisp lines. High-efficiency 1.28 Gal. flush offers up water savings without sacrificing performance. The included seat, positioned at chair height for comfort, noiseless closing and easy cleaning. One-piece toilets integrate the tank and bowl really makes a big difference and easier to clean. I really like the new ReadyLock installation system, I will never go back, a simple solution for toilets that saves time, hassle and eliminates the need to drill the floor or cut bolts. 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 into the bowl from all sides increasing the power and effectiveness of the flush. Just had this bathroom completely redone less then a year ago, had to change out the battery operated because it never worked.
    • Recommended
    2 found this review helpful
    The King's Throne
    This is an awesome toilet from the designs down to the powerful flush. Assembly is very easy, I was a little thrown off by the black tube connecting the toilet to the sewer drain but the instructions are very easy and assembly is a breeze. The toilet is all one piece and very heavy so be sure to have help when moving it. I had a slight issue with my water line being too close to toilet to place on the floor because of the boxed frame of the toilet but I was able to make it work.The flush is very strong and the toilet is very quiet. The lid has a very nice feature that prevents the seat from slamming down. Awesome toilet fit for a king!
    • Recommended
    1 found this review helpful
    Heavy Doody
    This is the “Mac-Daddy” of toilets that is big and powerful but still only uses 1.28 gallons per flush. I had some difficulty on the installation. Because of the toilet’s large footprint, the sewer drain line in the floor had to be moved out further from the wall; that extra 1.5” I needed was a big deal. There is also a large black plastic boot that is required to be attached to the main drain after the wax seal that was a challenge (see pic) and I had to pick up the toilet and re-seat it several times to get it to fit on this. Finally, for such a large toilet they did not allow much room underneath to attach the seat and lid. I could barely get my fingers in there. But after the toilet is installed, it is awesome! The square footprint made cutting floor tile to fit it very easy and the one-piece design eliminated a step in attaching the tank. This is a solid, attractive, quiet-flushing, and efficient toilet.
    • Recommended
    3 found this review helpful
    The product comes very well packaged and protected, with a box inside a box. This toilet is extremely heavy at around 100 lbs. There is the all in one tank and bowl, the seat, and the plastic piece that will sit on the wax ring and connect the bowl. Note that it does not come with a wax ring supplied, nor the T bolts or water line, which you will need to buy yourself at the store. This is a very unusual installation because of the plastic piece (see photo) of plumbing, and it will take two people to position the toilet over the plastic piece for final alignment. But once in place, it is relatively straightforward at that point. I like that there is a "skirt" around the base of the bowl. It not only looks elegant, but it eliminates the usual curve at floor level on conventional pedestal toilets where the bolt comes through to anchor the toilet to the ring, which is always very difficult to keep clean. This toilet does not have those bolts at floor level. The flush is excellent, using very little water, but with the flush all around the rim of the bowl, it gets the job done effectively and keeps the bowl quite clean at the same time. The height is slightly more than usual, making it more comfortable to use. This is not an inexpensive toilet, but it is the usual high quality that Kohler is known for and I'm sure will work well in our downstairs powder room for many years to come.
    • Recommended
    1 found this review helpful
    One Piece
    I really like the one piece design. No space between the bowl and the tank for 'stuff' to get trapped. I love the low water usage. The toilet I replaced, I had installed a low flush unit in its tank ... but the bowl/waste line was not designed to handle so little water. So, I typically ended up having to double flush, or hold the handle down. I love the fact it is 1 1/2" taller than my last toilet. Much easier to sit down and get up from. As a man, I love the elongated bowl. It gives me extra room. Also, as a man, I love the water level in the bowl is low. I no longer get cold water on my privates when I courtesy full. As for installation ... it is very different from a typical toilet. It probably is not heavier than a normal 2 piece toilet, but since you install the bowl and tank together, it makes it heavier. I was able to install it by myself, but I can see how others would need two people. The directions are very straight forward (mostly just pics), and although it took me over an hour to install. I am sure if I did it again, I could do it in less than half the time. As for shipping ... it came boxed, inside a box, on a pallet. Only way it could be shipped any safer is in a Styrofoam mold.
    • Recommended
    1 found this review helpful
    Easy to install. Powerful flush. More compact than a 2-piece toilet.
    This is a very elegant porcelain toilet and looks great in my bathroom. The toilet is 1-piece with the tank attached. The trap is concealed. With few cracks and crevices for dirt, dust and grime to hide, it is very easy to clean. At 28L x28.5W (tank) x 18.5W, this toilet is more compact than most 2-piece toilets, making it ideal for small bathroom spaces. This toilet installs similar to a standard toilet with a 12-in. rough-in, but rather than rest on the floor flange, this toilet uses an offset flange. The offset flange, brackets and mounting hardware for the offset flange is included, and you can reuse your existing water supply line, provided its in good condition, doesn't leak, and is the correct length, but you will need to purchase a wax ring and toilet mounting kit (for the flange bolts), as these items are not included with this Kohler toilet. The valve, float, flush lever, etc. are pre-installed in tank. When mounting the toilet to the offset flange, it's very important to properly align the toilet and ensure a good drain connection, so I'd recommend two people for this step; one to lift and suspend the toilet over the neck of the flange, and one to confirm a proper connection. The hole on each side of the toilet is a bit unsightly, and detracts from the otherwise clean look of the toilet's concealed trap. White plugs would make the appox. 3/4-inch diameter holes less visible, but no such plugs were included with my toilet, so I used plugs designed for a coin bank to hide the holes. The installation instructions are well written and contain written instructions and illustrations, making for a easy installation. The bright white color and elegant styling of this toilet coordinates well with other high-end fixtures and finishes in our bathroom. Even though this toilet uses only 1.28 gallons per flush, the flush is strong. Due to the keyhole design, a standard plunger will not give a good seal, so to free a clog, if you should get one, you will need to pick up a plunger designed for high-efficiency toilets, such as the Korky Beehive Max Toilet Plunger, available a The Home Depot (Store SKU #1000021479). Our old Toto brand toilet, although a water saver that used 1.6 gpf, was early technology which was not very efficient and had a weak flush, resulting in frequent clogs. This Kohler toilet and soft close seat is a great addition to our bathroom, and represents a huge improvement over our old toilet. I am very satisfied with it.
    • Recommended
    4 found this review helpful
    Beautiful well made toilet!
    First off, you will definitely need 2 people to install this toilet. #1) it's very heavy-about 100 lbs #2) you will need someone to help guide the toilet over the tube that goes into the tank outlet hole. (see pics). This installation is a little more difficult because of the attached "skirting" around the toilet base. You have to install the included plumbing piece that attaches to the flange ring and will go up into the tank hole when you attach the toilet over it. It also stabilizes the toilet with the included bolts that go into the sides of toilet. Hole covers are included and are hardly noticeable once inserted. The toilet is elongated and fits into the space of a round toilet which I really like! WORD OF CAUTION: Measure the width of the toilet to make sure your water line isn't in the way when installing this toilet! My plumber had to cut away the water line base plate so that this toilet would sit flat on the floor. (see pic) This is a standard 12" rough-in but the 10" and 14" rough-in kits are available. It's a one-piece toilet with comfort height making it more comfortable to use. Flushes very well without having to hold down the handle. I absolutely love the look of this toilet with the porcelain skirting around it. Makes it a lot easier to clean and doesn't have that bottom area that always catches dust and hair! There is a "soft close" seat included and is far more stylish than a standard seat. Has a high-end elegant look and really upgraded the style of this bathroom! I would have given it 5 stars if it had a base "template" to make sure the water line wasn't in the way and if it was priced more affordably, but if you're looking for a high end, elegant, well-made toilet, then it's worth the cost!
    • Recommended
    1 found this review helpful
    Great style, high quality but measure carefully
    This is a beautiful, well made toilet that is compatible with both modern and classic settings. The skirted base eases cleaning and one-piece design reduces leak risks. But this new design has a large rectangular base (older models had a smaller footprint and angled rear corners). If your water supply is in the floor, measure carefully!
    • Verified Purchase
    • Recommended
    Showing 1-10 of 28 reviews