KOHLER Highline K-25224 – [A Tall Toilets Roundup]

19 Inch Tall Bowl Toilet

18- & 19-inch Tall Bowl Toilet is a Reality Now With KOHLER Highline K-25224

Not too long ago, your frustration of not being able to find an 18 or 19 inches high bowl toilet is valid and understandable. The good news now, probably, is, those days may be over with the introduction of KOHLER Highline Tall K-25224.

It only shows there is a demand for higher bowl toilets, and KOHLER has picked up the trend at long last. But the American toilet maker is a little slow to respond (typical of megacorps). Before that, two companies are already peddling a higher than ADA height toilet, and with great success.

But, as the adage goes, better late than never. As a matter of fact, KOHLER is relatively fast to address this growing demand for high bowl toilets compared to the other established potty makers, like American Standard, Mansfield, and TOTO.

So is KOHLER's new 19-inch high bowl toilet going to spur more competition from its rivals? Get your popcorns ready. Now that the battle is heating up, not only are you going to be spoiled for choice going forward, prices are expected to get friendlier as the market matures. The development is definitely in your favor.

Let's get on with the discussion and compare the various brands and bowl height that you are interested in.

17-inch, 18-inch, 19-inch, 20-inch & 21-inch…You've Got it All

Though the competition is intensifying, it is still not prevalent as far as an above-17-inch bowl toilet is concerned. That's because those manufacturers are still not producing a complete height range of ADA's standard of 17 to 19 inches and with all other features.

Which is to say, there are no 17-, 18- & 19-inch seat height toilets are being offered by the same company. It's either-or, so you have to look elsewhere if what you need is offered by a different company. But compare to those we-have-only-17-inches days, isn't this a great beginning?

Now, before proceeding further with the discussion, you must be clear of what is an ADA toilet height.

The ADA height range of 17 to 19 inches refers to seat height and not bowl height. Be mindful of this when choosing your preferred bowl height. Always add an inch to the bowl to make it the seat height.

So a 19-inch high bowl, like the KOHLER K-25224 Highline Tall toilet, will make a 20-inch seat height.

Let's begin with a brief intro on the KOHLER K-25224 and what other above-17-inches ADA toilet models the company has to offer.

KOHLER Highline K-25224 the 19-inch Tall Bowl Toilet

Kohler K 25224 0

If you are looking for a 19-inch tall bowl toilet, you must be delighted to know the KOHLER Highline K-25224 is made for you.

Other than the 19-inch bowl height, the rest of the features are similar to any of the KOHLER Highline comfort height (chair height) models. The tank and bowl can be purchased separately. So if you already own a Highline (not the classic model), and intend to upgrade to a 19-inch bowl, you may consider replacing only the bowl.

Comfortable Size But Not For Small Bathroom

29-1/2 inches is the overall length (front to back), and the bowl is 15 inches wide. You will find the familiarity and signature look of a KOHLER Highline two-piece toilet. The bowl base or footprint is an inch bigger both in length and width at 27-3/4″ x 10-15/16″.

That's great if you have the luxury of space in the bath or powder room. Otherwise, do make sure you can still meet the building code requirements before deciding on this tall Highline crapper.

K 25224 Dimension

You Can't Go Wrong with a Class 5

With a tower or canister flush valve, a flush volume of 1.28 GPF, and a 2-1/8″ trapway size, it offers a power flush that is the signature class five flushing system. And of course, both the bowl and trapway surface are glazed for a smoother flush.

Reasonably Large Water Spot

The water surface is 9-1/4″ x 6-1/2″ and 6-3/8″ away from the rim. That's about 1 or 2 inches smaller than the other comfort height Highline models. But it's still a decent size to hold all the solid waste in the water to reduce stubborn smear and odor.

Standard Installation

Last but not least, the 12-inch rough-in makes for a standard installation. You can also adapt to a 10- or 14-inch rough-in by using an offset flange. So generally, there's nothing special to note as far as installation is concerned. Except, the water supply valve is now 7-1/2″ off the floor instead of the usual 5 inches.

So don't forget to move the supply valve up accordingly if you are replacing your standard or comfort height crapper with this KOHLER K-25224 Highline Tall toilet. Or else the standard supply line can be a bit of a stretch, or you may need a longer hose to reach the raised tank.

19-inch Bowl Height or Nothing?

In summary, this KOHLER Highline Tall toilet is basically a two-piece toilet with an exposed trapway. The higher bowl height and a slightly bigger bowl base are the only differences compare to the other Highline models. Performance wise, you probably won't notice the slight power enhancement due to the elevated trapway.

You are likely motivated to buy it because of its 19-inch bowl or 20-inch seat height. Or maybe it's a KOHLER, the brand that you trust. Whatever.

And the Highline is highly rated on Amazon as well as Home Depot. So, is this Highline Tall K-25224 going to get the same love as its shorter siblings? That remains to be seen. But it certainly looks promising.

Standard Design Across All The Brands

The first extra high bowl toilet, 20-inch high to be precise, is launched in 2016 by the Convenient Company. Subsequently, in 2018 and 2019, the Signature Hardware company comes out with an 18-inch” and 20-1/2″ high bowl toilet, respectively.

Now with the KOHLER 19-inch Highline Tall toilet, it pretty much fills the gap which was left untouched by the Convenient Company and Signature Hardware. So now, if you find the official ADA height is not good enough for your needs, you have 19, 20, and 21 inches of pure porcelain support. No toilet riser seat is needed.

As this is just the beginning, the companies are probably just testing the water to see how far the demand could stretch. So the safest is to start with the basic two-piece design with elongated bowl and exposed trapway. As that will be low cost and high acceptance level since 80% of home toilets are of such design.

Except for Signature Hardware, which has a round bowl model, the rest comes with an elongated bowl. And all of them are using the conventional bowl design with rim holes lined along the rim for bowl rinsing.

Other than the difference in bowl height, the appearance will set them apart. So which brand or model looks good in your opinion?

Tall Toilets Comparison

The 2 Tallest Bowl Toilet – Convenient Height versus Signature Hardware

If nothing matters more than having the tallest bowl, then the choice is obvious. That's assuming everything else is equal. But here are two different toilets made by two unrelated companies. There are differences, and you should also look at the other features to better make a well-informed decision.

As far as seating height is concerned, it is not that huge of a difference between the two toilets.

The Signature Hardware Bradenton is marketed as a 21-inch high bowl toilet. But its bowl height, according to the specification, is at 20-1/2″ to be precise. Whereas the Convenient Height model is 20-inch. So, the question is, will that half an inch make any difference to you when sitting down or getting up from the toilet seat? Probably not.

Physical Size Compare

Next is the overall size of the toilet. Though visually, the 2 toilets look about the same size, the slight difference in length can be a deciding factor when space is a little tight in your bathroom.

It could mean a little more or less room for the knee if you are going to install at a place where the front-to-back space has a bit of constraint. Or when the person who uses a wheelchair, an inch or two can make for better maneuverability in the bathroom.

The Convenient Height toilet has an overall length of 27 inches, versus 29 inches of the Bradenton. So this is one small consideration to take note beside the fractional difference in bowl height.

Model S Vs Bradenton

Flushing System Compare

The Model S of the Convenient Height toilet uses the tower flush valve, or flapperless valve if you like. That's a preferred flush valve by many as it offers obstruction-free to water flowing into the bowl, thus a more powerful flush.

But the main advantage of the tower valve is, it dramatically reduces leakage since there is no concern about a worn-out flapper. Or having the flapper not closing properly, which is a common problem with the chain and flapper system. That makes the tower valve a more reliable and durable option over the flapper.

Another advantage is the light activation force that the tower valve offers. Frail elderly or the disabled will find it much easier to pull a flush versus the flapper system when you have to lift the flapper up against the weight of the water.

The Signature Hardware Bradenton uses the standard chain and flapper valve. The advantage is low cost and replacement is easy to find. You can get it at almost any DIY store that carries generic toilet parts.

Flapper Vs Tower Valve
Image shown is illustrative only and not of the actual parts used by Convenient Height and Signature Hardware.

Lastly, the Convenient Height is a dual-flush toilet that offers a better water economy. The main flush is 1.28 GPF, and the 0.9 GPF light flush is good for flushing liquid waste.

Also comes with a 1.28 GPF, the Bradenton is a single flush toilet.

Pick Your Tall Toilet (Comparison)

So, what is your desired bowl height that you are looking for?

If a 20-inch seat height (19-inch high bowl), is all you wanted, then the KOHLER K-25224 is the only choice right now.

And if you are comfortable with a seat height of 19-inch (18-inch bowl height), then you will have a choice of round or elongated bowl from Signature Hardware.

All in all, 8 high bowl models are yours to pick from 17- right up to 21-inch in bowl height. Here's a comparison table of all the tall toilets for your easy selection.

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Available on: Brand (Model) Bowl Height Seat Height Overall Length Bowl Shape Gallons Per Flush (GPF)
Signature Hardware
20.5″ 21.5″ 29″ Elongated 1.28 GPF
Convenient Height
(Model S)
20″ 21″ 27″ Elongated 1.28 GPF/0.9 GPF
KOHLER Highline Tall
19″ 20″ 29-1/2″ Elongated 1.28 GPF
Signature Hardware
(Stalnaker – 413995)
18″ 19″ 28-1/2″ Elongated 1.6 GPF

Available on Signature Hardware’s website.

Signature Hardware
18″ 19″ 26-3/4″ Round 1.6 GPF
(1) KOHLER Highline Classic (K-3493) 17″ 18″ 30-9/16″ Elongated 1.6 GPF
(1) KOHLER Highline Classic (K-3519) 17″ 18″ 30-1/2″ Elongated 1.0 GPF
Signature Hardware
(Bradenton – 443129 or 945954)
17″ 18″ 27″ Elongated 1.28 GPF


(1) Toilet comes with a power-assisted flushing system. The flushing is expected to be louder than usual.
(2) Use MYSTYLE promo code for up to 25% off at Kohler.com

Wrapping Up

The choices presented are still limited but definitely a step forward in the right direction. It's only the beginning. Once the market demand for a taller-than-17-inches bowl continues to trend upwards, you can expect more brands to follow.

Though it cannot be compared to the standard and chair-height (comfort height) toilets at this moment, given time, it may just become a norm. Considering the boomers are into their 60s and 70s, the knees are screaming for a higher bowl.

Nevertheless, it's a welcoming development for the elderly and those with a mobility issue. And hopefully, more holistic progress of the tall toilets market can come sooner. Then, a two-piece, elongated, and exposed trapway design may not be adequate to meet the growing expectation for a friendlier and eye-pleasing tall toilet.

There's definitely plenty of room for improvement that offers better features. Such as a skirted bowl, one-piece design, and a rimless bowl. And will we ever get to see a smart toilet with a 20-inch high bowl in the future?


  1. Barbara Bernard
    Barbara Bernard

    Thank you! You just saved me hours of time looking at the specs of toilets to find a compact, tall one for my 6’ husband and son!

    • You are welcome Barbara. 🙂

  2. Jean Benning
    Jean Benning

    This entire information has been very thorough, Easy to comprehend, and exactly what I was searching for. My husband has dementia along with Chron’s and toilets are a big issue for his ease of use. The diagrams gave me all the knowledge to buy a replacement toilet that my husband used to have. Thank you, and Bless you.

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