Kohler vs American Standard toilets
Both make good toilets. The useful difference is what each one tells you before you buy, and it is not the same information.
By Sawyer V. · · How we research
The short answer
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Quick picks
Tap any row for the full write-up. Prices are checked against Amazon rather than remembered — where we have no verified figure the button says so.
| # | Product | Best for | Renter | Price |
|---|---|---|---|---|
| 1 | No photo yet Santa Rosa One-Piece Compact Elongated Toilet, 1.28 gpf One-piece, compact elongated and Comfort Height, with water surface, rim-to-water depth and every dimension on the sheet. | A fully drawn, compact one-piece | Owner-only | |
| 2 |  H2Option Two-Piece Dual Flush Chair Height Elongated Toilet with Seat and Wax Ring 0.92 and 1.28 gpf, a 1,000-gram MaP score, chair height, and the seat and wax ring included. | A published flush score and the parts in the box | Owner-only | |
| 3 |  Memoirs Stately One-Piece Compact Elongated Toilet with Skirted Trapway, 1.28 gpf A skirted one-piece with Kohler's ReadyLock system and 10 and 14 in. rough-in kits. | Skirted sides without drilling the floor | Owner-only | |
| 4 | No photo yet Studio Skirted Two-Piece Dual Flush Chair Height Elongated Toilet with Seat 1.0 and 1.28 gpf on a skirted base, with a 2-1/8 in. glazed trapway and a lifetime chinaware warranty. | A skirted dual-flush with the warranty spelled out | Owner-only |
What each maker puts on paper
Kohler’s specification sheets are drawings first. For each toilet you get the rough-in, trap passageway, water surface size, rim-to-water depth, seat-mounting holes, the codes it meets and a fully dimensioned drawing. What they do not give you is a flush-performance score, and the warranty is a name and a pointer to the website.
American Standard’s product pages are the reverse. They lead with flush volumes, sometimes a MaP score, the warranty in full, and a list of what is in the box. What they often leave out is the geometry: the H2Option page we read gave neither rough-in nor dimensions.
Neither approach is dishonest. They answer different questions, and the smart move is to know which question you most need answered.
Flush technology, in their own words
Kohler’s one-piece toilets here use the AquaPiston canister, which Kohler says “requires less force to actuate than a 3″ (76 mm) flapper, and has 90% less exposed seal material which resists conditions that cause wear, tear, shrinkage and swelling”.
American Standard’s tank toilets publish a 3 in. flush valve on models like the Cadet PRO, with its PowerWash rim and EverClean antimicrobial surface on the H2Option and Cadet PRO.
These are descriptions, not test results. The only comparable performance number either maker publishes across the toilets we cover is American Standard’s MaP score on the H2Option.
Warranty
American Standard spells it out on the page for the Studio, Colony and Cadet PRO models we cover: lifetime on the chinaware, five years on mechanical parts, and a year on the seat where one is included. Kohler’s toilet sheets name the KOHLER Toilets and Seats Limited Warranty and send you to its website; its smart toilets carry a three-year limited warranty.
What is in the box
American Standard tends to include more: the wax ring and seat on the H2Option, and a wax ring, bolts, bolt caps and install kit on the Studio skirted and Cadet PRO. Kohler’s one-pieces include the seat, but the supply line is sold separately.
Kohler’s trump card is ReadyLock on the skirted Memoirs Stately, which avoids drilling the floor.
Stock
When we checked, American Standard’s own store listed the H2Option in white as sold out or unavailable, and the Studio skirted, Colony 3 elongated and Cadet PRO as sold out or out of stock. A maker’s own store says little about what retailers hold, but check before you book a plumber.
Which to choose
American Standard if you want a published flush score and a warranty you can read before you buy. The dual-flush picks lean this way.
Kohler if you want to know the bowl and the footprint exactly before it arrives, or you want a skirted toilet without drilling the floor. The one-piece picks are all Kohler.
If you rent
Every toilet here rates Owner-only on our install rating. The toilet brand in a rental is the landlord’s choice; the seat is yours.
Every pick in full
4 we would buy. Each carries its Renter-Safe Install Rating, the published specs behind it, and the honest gap in what we know.
1. Best Kohler
Santa Rosa One-Piece Compact Elongated Toilet, 1.28 gpf
Kohler · K-3810 · best for a fully drawn, compact one-piece
One-piece, compact elongated and Comfort Height, with water surface, rim-to-water depth and every dimension on the sheet.
The Kohler Santa Rosa is a good example of what Kohler does well on paper. The sheet gives you an 11 by 8-1/8 in. water surface, 6-1/4 in. from rim to water, a 2-1/8 in. trapway, 5-1/2 in. seat-mounting holes, and a dimensioned drawing down to the supply position.
What it does not give you is a flush-performance score, or the warranty terms: the sheet names the “KOHLER Toilets and Seats Limited Warranty” and sends you to the website.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: Replacing a toilet means removing the old one, seating a new wax ring on the flange and reconnecting the supply. It is work on the property's drainage and never a tenant's change.
Read from published documentation, not from fitting one. Kohler — Santa Rosa K-3810 specification sheet. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
Left-hand trip lever only; the supply line is sold separately.
What we can’t tell you
No MaP score, and the warranty terms are not on the sheet.
Published specifications
| Type | One-piece, floor-mount |
|---|---|
| Bowl | Compact elongated — “occupying the same space as a round-front bowl” |
| Height | Comfort Height; 16-1/2 in. from floor to rim on Kohler's drawing |
| Flush | 1.28 gpf (4.8 lpf), AquaPiston canister |
| Trapway | 2-1/8 in. fully glazed |
| Water surface | 11 in. x 8-1/8 in.; rim to water surface 6-1/4 in. |
| Rough-in | 12 in. |
| Footprint | 27-3/4 in. deep, 18-3/4 in. wide, 28-3/16 in. tall |
| Seat | Quiet-Close elongated seat with Quick-Release |
| Standards | EPA WaterSense; ADA when installed to its requirements |
| Warranty | KOHLER Toilets and Seats Limited Warranty — terms are on Kohler's website, not the sheet |
| MaP rating | Not published on the specification sheet |
#ad We have no verified live price for this one right now, so we are not showing a number. How we’re funded.
2. Best American Standard
H2Option Two-Piece Dual Flush Chair Height Elongated Toilet with Seat and Wax Ring
American Standard · 606AA002.020 · best for a published flush score and the parts in the box
0.92 and 1.28 gpf, a 1,000-gram MaP score, chair height, and the seat and wax ring included.
The American Standard H2Option shows the other approach. The product page leads with performance: dual flush at 0.92 and 1.28 gpf and a MaP score of “1,000 grams”.
It also lists exactly what arrives: “Slow-close seat, chrome push-button actuator, color-matched bolt caps, and wax ring”. What it leaves out is the rough-in and the warranty, both of which Kohler would have put on the sheet or pointed to.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: A full toilet replacement on the property's drainage. The wax ring and seat come in the box, which helps an owner and changes nothing for a tenant.
Read from published documentation, not from fitting one. American Standard — H2Option dual flush chair height elongated toilet, published flush volumes, MaP and contents. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
A two-piece, with the tank-to-bowl joint that brings.
What we can’t tell you
No rough-in or warranty on the product page; white was listed as unavailable when we checked.
Published specifications
| Flush | Dual: 1.28 gpf / 4.8 Lpf full, 0.92 gpf / 3.5 Lpf light |
|---|---|
| MaP rating | “1,000 grams” |
| Water efficiency | WaterSense certified |
| Bowl | Elongated, chair height, “16 1/2-in. high” |
| Actuator | Chrome push-button on the tank lid |
| Included | “Slow-close seat, chrome push-button actuator, color-matched bolt caps, and wax ring” |
| Surface | “EverClean® antimicrobial surface”; “PowerWash® rim” |
| Rough-in | Not published on the product page |
| Warranty | Not published on the product page |
| Availability | White listed as sold out or unavailable on American Standard's store at the time of writing |
#ad Price $419.09 as of October 18, 2026. Prices change; Amazon’s listing is the one that counts. How we’re funded.
3. Best Kohler skirted
Memoirs Stately One-Piece Compact Elongated Toilet with Skirted Trapway, 1.28 gpf
Kohler · K-6428 · best for skirted sides without drilling the floor
A skirted one-piece with Kohler's ReadyLock system and 10 and 14 in. rough-in kits.
The Kohler Memoirs Stately is where Kohler’s installation engineering shows. Its ReadyLock system “eliminates the need to drill into the floor for standard 12″ (305 mm) rough-in”, which is the usual headache with skirted toilets, and Kohler sells 10 in. and 14 in. rough-in kits for other drains.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: Kohler's ReadyLock system removes the floor drilling, but it is still a toilet replacement on the property's drainage.
Read from published documentation, not from fitting one. Kohler — Memoirs Stately K-6428 specification sheet. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
The smallest water surface of the Kohler one-pieces we cover, at 9-5/8 by 7-3/8 in.
What we can’t tell you
No MaP score on the sheet.
Published specifications
| Type | One-piece, floor-mount, “Skirted trapway simplifies cleaning” |
|---|---|
| Bowl | Compact elongated |
| Height | Comfort Height; 16-1/2 in. from floor to rim on Kohler's drawing |
| Flush | 1.28 gpf (4.8 lpf), AquaPiston canister |
| Trapway | 2-1/8 in. |
| Water surface | 9-5/8 in. x 7-3/8 in.; rim to water surface 5-3/8 in. |
| Rough-in | 12 in. standard; 10 in. and 14 in. rough-in kits “also available” (K-5383, K-5381) |
| Installation system | ReadyLock, which “eliminates the need to drill into the floor for standard 12" (305 mm) rough-in” |
| Footprint | 27-3/4 in. deep, 18-1/4 in. wide, 28-1/4 in. tall |
| Seat | Quiet-Close compact elongated seat with Quick-Release |
| Standards | EPA WaterSense; California Energy Commission; ADA when installed to its requirements |
| Warranty | KOHLER Toilets and Seats Limited Warranty — terms are on Kohler's website, not the sheet |
| MaP rating | Not published on the specification sheet |
#ad We have no verified live price for this one right now, so we are not showing a number. How we’re funded.
4. Best American Standard skirted
Studio Skirted Two-Piece Dual Flush Chair Height Elongated Toilet with Seat
American Standard · 2794203.020 · best for a skirted dual-flush with the warranty spelled out
1.0 and 1.28 gpf on a skirted base, with a 2-1/8 in. glazed trapway and a lifetime chinaware warranty.
The American Standard Studio skirted is American Standard’s answer, and it comes with the thing Kohler’s sheets leave out: the warranty in writing, “Limited Lifetime Warranty on Chinaware; 5-Year Warranty on Mechanical Parts; 1-Year Warranty on Seat”. The wax ring, bolts, bolt caps and an EZ Install tool kit are in the box.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: A toilet replacement on the property's drainage. American Standard ships the install kit in the box; it is still an owner's job.
Read from published documentation, not from fitting one. American Standard — Studio skirted dual flush chair height elongated toilet, published flush volumes, trapway and warranty. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
Its light flush is 1.0 gpf, above the H2Option's 0.92.
What we can’t tell you
No MaP score and no WaterSense statement on its page; out of stock when we checked.
Published specifications
| Flush | Dual: 1.28 gpf (4.8 Lpf) full, 1.0 gpf (3.8 Lpf) light |
|---|---|
| Design | Skirted two-piece with a “concealed trapway” |
| Trapway | “2-1/8 in”, “fully glazed trapway” |
| Bowl | Elongated, chair height |
| Rough-in | 12 in., per American Standard's 12-inch rough tank listing |
| Included | “Wax ring, bolts, bolt caps, and EZ Install tool kit”, plus the seat |
| Warranty | “Limited Lifetime Warranty on Chinaware; 5-Year Warranty on Mechanical Parts; 1-Year Warranty on Seat” |
| MaP rating | Not published on the product page |
| WaterSense | Not stated on the product page |
| Availability | Out of stock on American Standard's store at the time of writing |
#ad We have no verified live price for this one right now, so we are not showing a number. How we’re funded.
Where to buy
Everything recommended on this page, in one place. Each link is an Amazon Associates link — we earn a commission at no extra cost to you, and it never decides a pick.
- Check price on Amazon
Santa Rosa One-Piece Compact Elongated Toilet, 1.28 gpf
Kohler · K-3810 · Renter verdict: Owner-only
- $419.09View on Amazon
H2Option Two-Piece Dual Flush Chair Height Elongated Toilet with Seat and Wax Ring
American Standard · 606AA002.020 · Renter verdict: Owner-only
- Check price on Amazon
Memoirs Stately One-Piece Compact Elongated Toilet with Skirted Trapway, 1.28 gpf
Kohler · K-6428 · Renter verdict: Owner-only
- Check price on Amazon
Studio Skirted Two-Piece Dual Flush Chair Height Elongated Toilet with Seat
American Standard · 2794203.020 · Renter verdict: Owner-only
#ad Prices are not shown because we only publish figures we have verified on the day. How we’re funded.
Questions people actually ask
is kohler better than american standard
Neither is better across the board on published specs. American Standard publishes a MaP flush score on the H2Option and full warranty terms on its product pages; Kohler publishes detailed bowl dimensions and drawings on every sheet.
which toilet brand has the better warranty
American Standard publishes its terms on the page: lifetime on chinaware, five years on mechanical parts, one year on an included seat, on the models we cover. Kohler's sheets name its toilets and seats limited warranty and point to its website for the terms.
what is kohler aquapiston
Kohler's flush canister, used instead of a flapper. Kohler says it needs less force to actuate than a 3 inch flapper and has 90% less exposed seal material.
does american standard include a wax ring
On several models we cover, yes: the H2Option ships with a wax ring and seat, and the Studio skirted and Cadet PRO include a wax ring, bolts, bolt caps and an install kit.
Sources
- Kohler — Santa Rosa K-3810 specification sheet
- Kohler — Memoirs Stately K-6428 specification sheet
- American Standard — H2Option dual flush chair height elongated toilet
- American Standard — Studio skirted dual flush chair height elongated toilet
- American Standard — Cadet PRO chair height elongated toilet
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