Kohler vs Toto (and 6 Other Toilet Brands): Flush Scores, Warranties, and Which to Buy

Short answer: if you want the best flushing toilet with the fewest things that can break, buy a Toto Drake. If you want a toilet that flushes nearly as well but is easier to live with for the next twenty years, with parts on the shelf at every big box store and a far longer warranty, buy a Kohler Cimarron. That is the honest version of the Kohler vs Toto debate, and the rest of this guide shows the work behind it.

This guide also goes further than those two brands. Search any toilet matchup (Gerber vs Kohler, Delta vs American Standard, Glacier Bay vs everything) and you will find the same thin, error-prone comparisons, so it made sense to put all eight major brands in one place: Kohler, Toto, American Standard, Delta, Gerber, Glacier Bay, Mansfield, and Project Source. Whichever comparison brought you here, it is answered below, with real model numbers and sources you can check yourself.

One thing I want to be upfront about: I have not run a lab test on forty toilets, and I am not going to pretend I have. I compared these brands on manufacturer spec sheets, independent MaP flush scores, actual warranty documents, and owner reviews. Where I could not verify a claim, I left it out. This guide was substantially rewritten and re-fact-checked in August 2026.

Quick verdicts if you just want the answer

• Best overall matchup (Kohler vs Toto): Toto Drake for pure flush performance and simplicity; Kohler Cimarron for warranty and parts availability. Both score a perfect 1,000 grams on MaP testing, so you are choosing on ownership experience, not flush power.
• Best budget: Glacier Bay (Home Depot’s house brand) or Project Source (Lowe’s house brand). Several models from each score the maximum 1,000 grams on MaP for a fraction of what the name brands cost.
• Best flush performance for the money: Gerber Avalanche or American Standard Champion 4. Both are 1,000-gram MaP performers, and Gerber backs the Avalanche’s tank parts for 15 years, the longest parts coverage of any brand here.
• Best comfort-height selection: Kohler, by depth of lineup. Nearly every popular Kohler line comes in their chair-height “Comfort Height” version, and you can see them in person at any home center. Toto’s “Universal Height” models are just as comfortable but harder to sit on before you buy.
• Best availability and repair parts: Kohler, and it is not close. Kohler parts hang on pegboards at virtually every Home Depot, Lowe’s, and hardware store in the country.

How I compared these brands

Every spec in this guide comes from one of four kinds of sources: the manufacturer’s own spec sheets and warranty documents, retailer product listings for the store-exclusive brands, the MaP tank-type toilet database, and the EPA WaterSense program. Two of those deserve a quick explanation, because I lean on them constantly below.

MaP scores (Maximum Performance testing) are the closest thing the toilet industry has to an independent report card. A third-party lab loads a toilet with soybean-paste test media and measures how many grams it clears in a single flush, on a scale that tops out at 1,000 grams. Anything at 600 grams or above will handle real-world use without drama; a 1,000-gram score means the toilet maxed out the test. When I cite a MaP score below, it comes from the February 2025 MaP database linked above.

WaterSense is the EPA’s efficiency label. The federal maximum for toilets is 1.6 gallons per flush; WaterSense-labeled toilets use 1.28 gallons or less, about 20 percent under the federal standard, and have to pass independent performance testing to earn the label. Almost every current model in this guide is a 1.28 gpf WaterSense toilet, so water use is mostly a wash between brands.

One more note before the comparisons: a lot of toilet content on the internet swaps technologies between brands. For the record, AquaPiston and Class Five belong to Kohler, Tornado Flush and G-Max belong to Toto, and Champion, Cadet, and VorMax belong to American Standard. Every technology name in this guide is verified against that brand’s own documentation.

The master comparison table

Brand	Market position	Flush technology	China (bowl/tank) warranty	Tank parts warranty	Where sold
Kohler	Premium mainstream	AquaPiston canister, Revolution 360, Class Five	Limited lifetime (residential)	10 years on most lines; 5 years on Wellworth, Highline and a few others; 1 year on touchless parts	Home Depot, Lowe’s, hardware stores, plumbing suppliers
Toto	Premium, performance-first	Tornado Flush, G-Max (older models), Cefiontect glaze	1 year limited	1 year limited	Plumbing suppliers, showrooms, online; limited big box stock
American Standard	Mainstream value to premium	Champion 4, Cadet 3, VorMax	Limited lifetime on flagship lines (Champion 4, Champion Pro, Boulevard, Town Square S, Tropic, Studio S); varies by model	10 years on those flagship lines	Home Depot, Lowe’s, plumbing suppliers
Delta	Value, faucet brand extending into toilets	Gravity flush; no proprietary system marketed	Limited lifetime (as long as the original buyer owns the home)	1 year on mechanical parts; 5 years on electronic parts	Home centers and online
Gerber	Pro/trade brand	Dual-fed siphon jet (Avalanche, Viper)	Limited lifetime (residential)	15 years on Avalanche and Viper; shorter on other lines	Plumbing wholesalers and showrooms, not big box
Glacier Bay	Budget house brand	Gravity and dual-flush gravity	Limited lifetime	Limited lifetime per Home Depot’s warranty document	Home Depot exclusively
Mansfield	Value/mid, made in USA	Gravity siphon; SmartHeight is their chair-height term, not a flush system	Limited lifetime (residential)	5 years on tank trim; 1 year on dual-flush trim	Plumbing wholesalers and regional retailers
Project Source	Budget house brand	Gravity flush	Varies by model; check the listing	Varies by model; check the listing	Lowe’s exclusively

Flush scores for popular models

Here is the part that surprises most people: on the MaP test, a $150 house-brand toilet and a $600 name-brand toilet can post the exact same maximum score. All figures below are from the February 2025 MaP tank-type database. (The 12-inch Drake appears in that database under its 10-inch rough-in and insulated-tank variants, both at 1,000 g.)

Model	Flush volume	MaP score
Toto Drake (CST776CEFG)	1.28 gpf	1,000 g
Toto Ultramax II (MS604124CEFG)	1.28 gpf	800 g
Kohler Cimarron (K-31641)	1.28 gpf	1,000 g
American Standard Champion 4	1.28 or 1.6 gpf	1,000 g
American Standard Cadet 3	1.28 gpf	1,000 g
American Standard VorMax models	1.28 gpf	1,000 g
Delta (several current models)	1.28 gpf	1,000 g
Gerber Avalanche	1.28 gpf	1,000 g
Gerber Viper	1.28 gpf	800 to 1,000 g by model
Glacier Bay dual-flush (N2316)	1.1/1.6 gpf	1,000 g
Mansfield Summit	1.28 gpf	1,000 g
Mansfield Alto	1.28 gpf	600 to 800 g by configuration
Project Source models	1.28 gpf	800 to 1,000 g

The takeaway: flush performance alone will not settle any of these matchups, because the good models from every brand clear the test. Warranty, parts, comfort, and price are where the real differences live.

Kohler vs Toto: the headline matchup

This is the comparison that matters most to the most people, so it gets the deepest treatment.

Flush technology: canister vs cyclone

Kohler’s signature is the AquaPiston canister valve. Instead of a rubber flapper hinged on one side, a canister lifts straight up and lets water leave the tank from all 360 degrees of the valve opening at once. Kohler pairs it with Revolution 360 swirl flushing on the Cimarron line, and uses its Class Five flush engine, built around a large flush valve and a direct-fed jet, on lines like the Highline. Both are documented on Kohler’s own spec sheets for the Cimarron K-31641 and the Highline Arc K-78279.

Toto’s signature is Tornado Flush: a rimless bowl with two side nozzles that spin the water in a cyclone around the bowl, documented on the Drake spec sheet. Older and still-sold Drake variants like the CST744S use Toto’s earlier G-Max system, a 3-inch flush valve with a large siphon jet, at 1.6 gpf. Most current Toto bowls also get Cefiontect, an extra-smooth glaze that keeps waste from sticking to the ceramic. Kohler counters with a CleanCoat surface treatment on the Cimarron, but Cefiontect is a fired-in glaze rather than an applied treatment, and it is the one with the reputation among owners.

The models to actually compare: Cimarron vs Drake

The Kohler Cimarron (the round-front K-31641 and its elongated siblings) is a 1.28 gpf, chair-height, two-piece toilet with the AquaPiston canister and Revolution 360 flushing, and it scores 1,000 grams on MaP. As of August 2026, Kohler’s own site sells the round-front K-31641 at $398.40 against a $531.20 list price, and street prices at home centers typically run at or under that.

The Toto Drake (CST776CEFG two-piece, elongated, Universal Height) is also 1.28 gpf, also chair height, also a 1,000-gram MaP performer, with Tornado Flush and Cefiontect. As of August 2026, TOTO’s own site lists two-piece Drake configurations at $549, and plumbing retailers typically list it around $500, with street prices frequently in the $350 to $500 range depending on finish and promotions. If you want a one-piece Toto instead, the Ultramax II (MS604124CEFG) is the same flushing package in a one-piece body (it scores 800 g on MaP to the Drake’s 1,000, still comfortably above the 600 g real-world threshold).

On paper the toilets are near twins. The differences show up after installation. The Drake is a straightforward gravity toilet with conventional tank internals, and Toto’s reputation among plumbers for reliability is the best in the business. The Cimarron’s canister valve flushes beautifully, but its canister seal is a known replacement item as the years go by. If you own a Kohler and the tank runs or hisses, that seal is the first suspect, and I cover the fix in my Kohler toilet troubleshooting guide.

Warranty and parts: where Kohler pulls ahead

Here is the number that surprises people. Toto, the brand with the best performance reputation, gives you a one-year limited warranty on its vitreous china toilets. It is printed right on the Drake’s own spec sheet. Kohler covers vitreous china with a limited lifetime warranty for residential use, plus ten years on tank parts for most lines (five years on value lines like Wellworth and Highline, one year on touchless components), per Kohler’s toilet warranty page.

In practice, china almost never fails, so the warranty gap matters less than it looks. But the parts story matters a lot. Kohler repair parts hang in virtually every big box plumbing aisle in America. Toto parts usually mean a plumbing supply counter or an online order, which turns a 20-minute fix into a two-day wait. Toto’s counterargument is fair, though: its simpler internals need parts less often in the first place.

My pick

Both are excellent, and you will not regret either. I lean Toto Drake if flush reliability is your top priority and you do not mind ordering the occasional part, and Kohler Cimarron if you want to see the toilet before buying, save some money up front, and be able to fix anything that fails with a same-day store run. Households that keep toilets for decades tend to be happier with whichever brand they can get parts for locally, and for most people that is Kohler.

The eight brands, one at a time

Kohler

Kohler is the default premium brand at American home centers, with the widest range of styles, colors, and heights of any brand here. Flush technology: AquaPiston canister with Revolution 360 on the Cimarron family, Class Five on lines like the Highline. Notable models: the Cimarron K-31641 (round-front, 1.28 gpf, chair height, 1,000 g MaP) and the Highline Arc K-78279, a 1.28 gpf Class Five, elongated, chair-height model sold as a “complete solution” kit with seat, wax ring, and bolts in the box. Warranty: limited lifetime on china, ten years on most tank parts. Where sold: everywhere.

Toto

Toto is the performance benchmark, a Japanese brand whose Drake is one of the most recommended toilets on the internet, including by plumbers. Flush technology: Tornado Flush with Cefiontect glaze on current models, G-Max on older ones. Notable models: Drake CST776CEFG (two-piece, 1,000 g MaP) and Ultramax II MS604124CEFG (one-piece, 800 g MaP), both 1.28 gpf and Universal Height. Warranty: one year limited, the shortest in this guide. Where sold: plumbing suppliers, kitchen and bath showrooms, and online; big box stores carry limited stock at best.

American Standard

American Standard is the other everywhere-brand, and its lineup is easiest to understand as three flush systems. Cadet 3 is the value workhorse: a 3-inch flush valve, sold in a huge range of configurations, with 1.28 gpf versions scoring 1,000 g on MaP. Champion 4 is the clog-fighter: a 4-inch flush valve and a 2-3/8-inch trapway, per the Champion 4 product listing, and also a 1,000 g MaP performer. VorMax is the bowl-cleaning system, which blasts a scrubbing stream around the bowl instead of rim holes, per the VorMax collection page. Warranty on the flagship lines (Champion 4, Champion Pro, Boulevard, Town Square S, Tropic, Studio S): limited lifetime on the chinaware, ten years on mechanical parts, one year on the seat. Other models vary, so check the specific warranty. Where sold: everywhere.

Delta

Delta is a faucet company first, and its toilets are value-priced models sold mainly through home centers and online. There is no proprietary flush engine along the lines of AquaPiston or Tornado Flush to talk about, and one attribution worth getting right, because brand comparisons around the web routinely bungle it: AquaPiston is Kohler’s technology, not Delta’s. Several current Delta models do score the full 1,000 g on MaP, so the flush itself is not a weakness. The warranty is the fine print to read: Delta covers the china for as long as the original purchaser owns the home, but mechanical parts are covered for just one year (five years on electronic parts). That is the shortest parts coverage of any non-Toto brand here.

Gerber

Gerber is the plumber’s brand, sold through plumbing showrooms and wholesale distributors rather than big box aisles; Gerber’s own where-to-buy page points you to showrooms, not store shelves. That distribution is why homeowners rarely see it, and why plumbers install so much of it. Flush technology: dual-fed siphon jet bowls on the Avalanche, which Gerber rates at a 1,000 gram MaP score with 60 feet of drain line carry, and the value-line Viper, whose models score 800 to 1,000 g depending on configuration. Warranty: limited lifetime on china for residential use, and a standout 15 years on tank parts for Avalanche and Viper, per Gerber’s current warranty document. If a plumber quotes you a Gerber, that is not a downgrade; it is a pro-grade toilet with the longest parts warranty in this comparison.

Glacier Bay

Glacier Bay is Home Depot’s exclusive house brand, and it is the budget pick that keeps embarrassing more expensive toilets on paper. Multiple Glacier Bay models score the maximum 1,000 g on MaP, including the popular N2316 dual-flush (1.1/1.6 gpf, elongated, seat included). Home Depot backs Glacier Bay toilets with a limited lifetime warranty per the warranty document packed with the toilet. The trade-offs are real but modest: lighter-duty seats and hardware, fewer style choices, and internals that are generic universal-fit parts, which is honestly a repair advantage, since replacements are on the shelf in the same store. I could not verify exact current prices while researching this guide, so check the live Home Depot listings.

Mansfield

Mansfield is the sleeper pick: a value-to-midrange brand that manufactures in Perrysville, Ohio, making it the made-in-USA option in this group, per Mansfield’s own company page. Notable lines: the Summit, which Mansfield rates at a 1,000 g MaP score at 1.28 gpf, and the Alto, which posts 800 g at 1.28 gpf in the combination Mansfield cites (some Alto configurations score 600 g) and uses standard Fluidmaster tank trim, so repair parts are easy even though the toilets themselves are not big box items. One naming note: Mansfield’s chair-height term is SmartHeight. “Comfort Height” is Kohler’s trademark. Warranty: limited lifetime on china, five years on tank trim, one year on dual-flush trim. Where sold: plumbing wholesalers and regional retailers, so like Gerber, you will probably need to seek it out.

Project Source

Project Source is Lowe’s house brand, the direct counterpart to Glacier Bay; the MaP database lists Project Source models under “Lowe’s” as the brand of record. Those models score 800 to 1,000 g at 1.28 gpf, which is genuinely good for entry-level money. Warranty terms are published per model on the Lowe’s listing rather than on a central brand page, so read the specific product page before you buy. The same house-brand trade-offs as Glacier Bay apply: basic styling, lighter hardware, generic internals.

The rest of the head-to-heads

Toto vs American Standard

The premium performance brand against the mainstream giant. Flush performance is a tie at the top: Drake, Champion 4, Cadet 3, and VorMax models all post 1,000 g MaP scores. American Standard wins on warranty (lifetime china and 10-year parts on flagship lines vs Toto’s one year), on availability, and usually on price. Toto wins on glaze (Cefiontect), on rimless bowl cleaning, and on long-term reliability reputation. My pick: Champion 4 if your household is hard on toilets and you want warranty backup; Drake if you want the toilet you never think about again.

Delta vs Kohler

This one is more lopsided than the price gap suggests. Both brands have 1,000 g MaP models, but Kohler gives you ten years on tank parts where Delta gives you one, and Kohler’s parts ecosystem is unmatched. Delta makes sense when the budget is tight and the toilet is for a low-use bathroom. For a main bathroom, spend up to the Kohler Cimarron; the ownership math favors it within a few years.

Delta vs American Standard

Two value-friendly brands, one clear winner for most buyers. American Standard’s Cadet 3 matches Delta’s flush scores, adds a proven 3-inch flush valve design with widely available parts, and the flagship lines carry ten-year mechanical coverage against Delta’s one year. Buy the Cadet 3 unless a specific Delta model is meaningfully cheaper for the same specs at your store that week.

Gerber vs Kohler

Pro brand vs premium mainstream. The Gerber Avalanche matches the Cimarron’s 1,000 g MaP score and beats Kohler’s parts warranty, 15 years to 10. Kohler wins on styling choices, in-store availability, and DIY-friendly parts access. My pick: if a plumber is installing and will source the toilet, take the Gerber Avalanche; if you are doing this yourself, the Kohler is easier to buy and easier to fix.

Gerber vs Toto

The two plumber favorites. Toto has the better glaze and the stronger reputation; Gerber has a 15-year parts warranty against Toto’s one year, and usually costs less through the same supply houses. The Avalanche and the Drake both clear 1,000 g. This is closer than most people think: Drake if you want the benchmark, Avalanche if you want most of the performance with far better warranty coverage.

Glacier Bay vs Kohler and American Standard

The budget question, and it deserves a straight answer: a 1,000 g Glacier Bay flushes as well as a 1,000 g Kohler or American Standard. What you give up is fit and finish (seats, hardware, flush feel), style selection, and brand-name parts support, though Glacier Bay’s generic internals are easy to replace cheaply. For a rental, a kids’ bathroom, or a flip, Glacier Bay is the smart money. For a main bath you will use for twenty years, the Cimarron or Champion 4 justifies the difference in daily feel and warranty.

Mansfield vs Kohler

Mansfield’s Summit matches Kohler’s flagship MaP scores and is made in Ohio, which matters to some buyers. Kohler wins on parts availability, lineup depth, and tank-parts warranty (10 years vs Mansfield’s 5 on trim). If you have a good local plumbing supplier and want American-made, the Summit is a legitimate pick; otherwise the Cimarron is the easier ownership experience.

Project Source vs American Standard

Lowe’s shelf question: house brand or the Cadet 3 a few feet away? Project Source wins on price; the Cadet 3 wins on everything else that shows up over time: proven valve design, parts support, and the warranty behind it. My rule: Project Source for low-use or short-horizon bathrooms, Cadet 3 anywhere the toilet gets daily family use.

The verdicts

• Best budget: Glacier Bay at Home Depot, with Project Source at Lowe’s as the equivalent play. Insist on a model with a 1,000 g MaP score; the database is public, so check before you buy.
• Best flush performance: a four-way tie on scores (Toto Drake, Kohler Cimarron, American Standard Champion 4, Gerber Avalanche all hit 1,000 g), so break the tie on what fails less: the Drake’s simple internals, or the Champion 4’s giant 4-inch valve and wide trapway if clogs are your household’s problem.
• Best comfort and height options: Kohler for sheer selection of chair-height models you can actually sit on in a store. Toto’s Universal Height and American Standard’s chair-height models are equally comfortable once installed; Mansfield’s SmartHeight covers the same need.
• Best availability and parts: Kohler, then American Standard. Gerber has the longest parts warranty (15 years) but you will order those parts through a supplier.
• If I had to buy one toilet today: for a main bathroom, the Toto Drake or Kohler Cimarron, and I would let local parts availability and the price that week break the tie.

Before you buy: five things to check

1. Rough-in distance. Measure from the wall (not the baseboard) to the center of the closet bolts. Most toilets here are 12-inch rough-in; a 10-inch rough-in bathroom needs a specific variant, and not every model offers one.
2. Bowl shape and height. Elongated bowls are more comfortable but stick out about 1.5 inches farther, which matters in small bathrooms. Chair height (roughly 17 inches to the seat) is easier on knees; standard height is better for shorter adults and kids.
3. What is in the box. Some models (like Kohler’s Highline Arc “complete solution” kits) include the seat, wax ring, and bolts. Toto Drakes in the CST series do not include a seat. A missing $40 seat changes the price comparison.
4. MaP score for the exact model number. Scores vary within a brand, sometimes within a product line. Look up the exact model, not the brand.
5. WaterSense and local rebates. If you are replacing an old 3.5 gpf toilet, a 1.28 gpf WaterSense model saves thousands of gallons per year, and many utilities pay rebates on labeled models.

When to call a plumber

Swapping a toilet is a very doable DIY job: shut-off, drain, unbolt, new wax ring, set the new bowl. Call a pro instead if the closet flange is broken or below floor level, if the shut-off valve will not close or is corroded solid, if you find rot or soft flooring around the old toilet, or if you are moving the drain location. Those are the situations where a $200 install fee is much cheaper than the water damage from getting it wrong.

Key takeaways

• Kohler vs Toto is a tie on flush performance (both hit 1,000 g on MaP); choose the Drake for simplicity and reliability, the Cimarron for warranty and same-day parts.
• Warranties differ wildly: Toto and Delta cover mechanical parts for one year, Kohler and American Standard for ten on their main lines, and Gerber for fifteen on Avalanche and Viper.
• House brands are legitimate: Glacier Bay (Home Depot) and Project Source (Lowe’s) both offer 1,000 g MaP models at entry-level prices.
• Flush technology names are brand-specific: AquaPiston and Class Five are Kohler, Tornado Flush and G-Max are Toto, Champion, Cadet, and VorMax are American Standard.
• Check the MaP database and the exact model’s warranty before buying; those two documents settle most brand debates faster than any review.