7 Best One-Piece Toilets

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For decades, a two-piece toilet was the only option for homeowners. While effective, they weren’t necessarily easy to clean and can have an outdated look.

The best one-piece toilets can give your bathroom a whole new style, but choosing the right one is easier said than done.

Our team did the hard work, so you don’t have to, and found the American Standard Champion 4 to be the best overall one-piece toilet for homeowners today.

That’s our top choice, but we have something for every bathroom, both big and small. We’ve also put together a buying guide to show you the areas you’ll need to hone in on to find the perfect match for your home.

American Standard Champion 4 One Piece Toilet
Best Overall
American Standard Champion 4 One Piece Toilet
9
  • Low-consumption (1.6 GPF/6.0 LPF)
  • EverClean surface keeps your toilet cleaner
  • Elongated siphon action jetted bowl
  • Slow close toilet seat included
KOHLER Santa Rosa Elongated Comfort Height Toilet
Best from KOHLER
KOHLER Santa Rosa Elongated Comfort Height Toilet
9
  • Compact elongated bowl
  • Seat and lid included
  • 1.28 gallons per flush (gpf)
  • Aqua Piston canister
Swiss Madison Well Made Forever St. Tropez One-Piece Toilet
Best Dual-Flush
Swiss Madison Well Made Forever St. Tropez One-Piece Toilet
8
  • Fully skirted trapway
  • Sleek and modern design
  • Soft closing seat included
  • Special holes to reach the bolts

7 Best One-Piece Toilets Reviewed

Shopping for a new toilet isn’t necessarily something homeowners have ever been enthusiastic about.

Well, things have changed in recent years, so you might be surprised by some of the picks on our list of the best one-piece toilets.

1. American Standard Champion 4 One Piece Toilet

The Best One-Piece Toilet Overall

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PROS

  • Powerful flush valve
  • Elongated bowl
  • No-clog design
  • EverClean surface makes cleaning a breeze
  • Slow-close toilet seat
  • 10-year warranty

CONS

  • Powerful but loud flushes

Many companies claim their toilets will remain clog-free, but American Standard has a line known for that. The Champion 4 is one of the best no-clog toilets and an excellent choice for homeowners interested in a one-piece design as well.

Simple and modern are two words that come to mind with the Champion 4. It has a classic design with a left-handed trip lever and is a single-flush system. EverClean technology ensures the toilet is easy to clean, while the water-saving 1.6 GPF system helps conserve water.

A large 4″ piston action Accelerator is part of the reason the toilet can move more mass along with the 2.3″ trapway.

The Champion 2004314 has an elongated bowl and comes with the company’s slow-close toilet seat. It’s also available in several different configurations depending on your needs.

This model is a standard height toilet, which comes in at around 15″ without the seat. A comfort variant is also available with the same features but an extra 1.5″ of height. Both come in three colors with traditional White, Linen, or Bone.


2. Swiss Madison Well Made Forever St. Tropez One-Piece Toilet SM-1T254 

The Best Dual-Flush One-Piece Toilet

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PROS

  • Sleek, space-saving design
  • Soft-closing toilet seat
  • Skirted trapway
  • High-capacity dual flush system
  • Easy to install
  • Three colors to choose from

CONS

  • Some homeowners found it challenging to install

Homeowners interested in saving space in their bathroom have no shortage of compact toilets to choose from. The St. Tropez certainly fits that bill with a minimal footprint. It’s stylish enough to go with almost any type of décor and has an attractive price point as well.

Swiss Madison Well Made Forever put a lot of thought into the modern design of this one-piece toilet. It features a full-skirted trapway, which makes cleaning a breeze while adding to the minimalistic vibe.

On top of the tank, you’ll find chrome flush buttons for a flushing system which is both powerful and efficient.

The dual Vortex flush on the St. Tropez is rated at 1.1 or 1.6 gallons per flush. We thought the classy matte chrome hinges on the toilet seat were a nice touch, and the soft-closing seat is as easy to remove as the toilet is to install.

This well-made toilet has all you could ask for and sports a larger trapway than similar models at 2.75 inches. It comes with everything you need for a painless installation and is available in three distinct colors, including Matte Black.


3. KOHLER Santa Rosa Elongated Comfort Height Toilet

An Elegant One-Piece Toilet from KOHLER

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PROS

  • Quiet-Close seat
  • Chair-Height for maximum comfort
  • Elongated bowl
  • AquaPiston technology
  • WaterSense
  • Available in five colors

CONS

  • Price compared to similar toilets
  • Single-flush toilet

KOHLER is a name synonymous with high-quality bathroom fixtures, including sinks, faucets, and showerheads. While the company’s toilets tend to get overlooked, the Santa Rosa is one you’ll want to consider if comfort and conservation are key.

KOHLER decided to keep things simple with the design of the Santa Rosa. It is in the compact category but with a chair-height seat 2″ higher than your standard toilet.

The elongated toilet bowl provides more space, and it’s effortless to clean even if it isn’t skirted like other models on our list.

You won’t find a dual-flush system on the KOHLER Santa Rosa, although it does have a sturdy left-handed trip lever and takes advantage of the company’s powerful AquaPiston Flush technology. This allows for a cleaner flush thanks to a 360-degree flow from all sides.

The canister in this toilet is designed to expose less seal on the flapper, which decreases the chance of leaks. The Santa Rosa is rated at 1.28 gallons per flush and comes with a Quiet-Close seat to go along with the company’s standard warranty.


4. Woodbridge Athena Smart Toilet

A Smart Toilet with a Sleek Design

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PROS

  • Siphonic dual-flush system
  • Seat opens and closes automatically
  • Bidet with multiple settings
  • Heated seat
  • Warm air dryer
  • Remote control

CONS

  • The price tag
  • Installation could prove challenging

Whether one or two-piece, toilets are simple by design. The Athena from Woodbridge is an exception to the rule. It’s a smart toilet that’s packed full of high-tech features and one of the most comfortable commodes on the market today.

The Athena is a dual flush toilet with an integrated bidet. It is WaterSense certified with an average rate of 1.28 gallons per flush and an automated flushing system.

When you stand up, the bidet wand will spray the toilet bowl down before it flushes. That wand serves another purpose, however, with several different cleansing modes, including posterior, feminine, and pulsating wash.

Even if you’re not partial to bidets, you will appreciate the warm air dryer and heated seat. This contoured toilet seat will keep you warm in the winter, while night light can help with mobility in the dark. The toilet seat automatically opens and closes, making the Woodbridge Athena truly hands-free.

Another feature every homeowner will find useful is the built-in deodorizer. An ionized carbon filter will handle any foul odors, and most of the features can be controlled with a wireless remote. The Athena sports a premium price tag but is backed by US-based customer support.


5. KOHLER Adair One-Piece Toilet K-3946-RA 

The Best One-Piece Toilet with a Right-Handed Trip Lever

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PROS

  • Comfort height
  • Inspired design
  • WaterSense certified
  • Quit-close lid
  • Right-handed trip lever

CONS

  • Single-flush toilet

Our second choice from KOHLER is completely different from our first from a design standpoint. The Adair K-3946-RA has a right-handed trip lever with a more organic design based on the windswept rocks from Arizona.

Consumers found this one-piece toilet very comfortable with an elongated bowl and chair-height seat set at 16.5 inches from the floor. On the tank’s upper right side, you’ll find a polished chrome plated trip lever.

Inside the tank is the company’s popular AquaPiston canister system, which provides a powerful flush.

The KOHLER Adair is a single-flush toilet rated at 1.28 gallons per flush. That means it’s WaterSense certified, and their canister requires less actuation force than a traditional flapper. The company also installed their Cachet Quiet-Close set, which is easy to remove and clean.

Finding a toilet with a right-handed trip lever can be challenging, especially from a solid brand. The Adair checks all the right boxes when it comes to efficiency and won’t break the bank.

This one-piece commode fits on a standard 12-inch waste line and comes with a 1-year guarantee from KOHLER.


6. Glacier Bay High-Efficiency Dual Flush Elongated Toilet N2420

The Best Budget-Friendly One-Piece Toilet

Glacier Bay N2420 toilet

PROS

  • Dual-flush system
  • Elongated bowl
  • Chair height
  • Excellent price
  • WaterSense certified

CONS

  • Availability in some areas
  • Mediocre seat

Brands like KOHLER and American Standard are mainstays in bathrooms around America, but there are other companies to consider when your budget is tight.

Glacier Bay is a popular option through Home Depot, and the N2420 is one of the best budget-friendly toilets available for homeowners today.

With a height of 16.5″ from the floor, this toilet is in the comfort class or chair height. It has a transitional style that will work well in any bathroom. The chrome trip lever on top also adds a touch of class.

That lever allows you to choose between flow rates of 1.1 or 1.6 GPF for liquid or solid waste. While the Glacier Bay N2420 may not stand out from the pack when it comes to style, it is efficient.

Its WaterSense certified at 1.1 GPF, and while gravity-fed, still provides a strong flush every time.

An elongated bowl provides additional comfort on this toilet. It’s of average size with a MaP rating of 1,000 and fits on a 12-inch rough-in. Consumers found this toilet easy to install, although you might want to pick up a softer seat.

This high-efficiency commode is full of impressive features given the price and comes with a solid warranty as well. The Glacier Bay is available in four colors, although the available stock may vary by your location.


 7. HORO HT1000 Compact One Piece Toilet

The Best Compact One-Piece Toilet

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PROS

  • Space-saving design
  • Dual-flush system
  • The price tag
  • Concealed trapway
  • Soft-closing seat

CONS

  • Low MaP score
  • Uncomfortable seat

You don’t have to look hard to find a compact toilet, although some live up to that namesake better than others.

HORO might not be a brand as familiar as other companies on our list, but you’d be remiss to overlook that HT100 if you’re interested in something small and affordable.

This one-piece toilet has a transitional design that will work in many spaces while leaving a small footprint behind. It measures 25″L x 13.4″W x 28.4″H and is 16.5″ from the floor with the included seat. That technically puts it in the comfort class, even with these dimensions.

There aren’t many features on the HT1000, but the company installed a dual-flush system on this commode. It’s rated at 1.1/1.6 GPF, so it saves water along with floor space. The glazed surface makes the bowl easy to clean, and the toilet fits a standard 12″ rough-in.

This toilet is ideal for a small or second bathroom, and we love the fact it has a dual-flushing system considering the price.

The concealed trapway is a nice touch, although the short bowl and seat may be uncomfortable for some. The HOROW HT1000 comes with a tiered warranty and lifetime after-sale service.


one piece toilet closeup

How to Find the Best One-Piece Toilet

Toilets are not complicated fixtures, although manufacturers have significantly increased efficiency over the years with new designs.

While one-piece toilets offer several advantages over a traditional commode, there are still several areas to consider before settling on a choice for your bathroom.

Toilet Height

Some people spend a considerable amount of time on the porcelain throne each day, while others are in and out in minutes.

Regardless of how long you spend on a toilet, nobody wants to be uncomfortable. A comfortable commode comes down to two factors – the seat and height.

You can change out any toilet seat in seconds, but height is the one thing that can’t be altered. When looking for the best one-piece toilet, you’ll need to decide about the height, which is measured from floor level to the top of the bowl without the seat.

Standard Height Toilets

Any standard toilet will have a bowl that stands around 14 to 15 inches above the floor. While you can purchase thick or high toilet seats, they would have a lot of ground to make up before getting into the next class.

Comfort Height Toilets

Comfort or chair height toilets are several inches higher than a standard commode. They are easier to get on and off of than a traditional toilet and range between 16 to 17 inches from most manufacturers. If you need an ADA compliant one-piece toilet, you’ll want one in this class. 

Design & Dimensions

While there are a variety of toilet styles, you should take the bowl shape and overall dimension into account before choosing a color. Rough-in size is the most important. It refers to the distance from the back of the wall to the center of the waste pipe beneath the toilet.

If you know the model of the toilet you plan to replace, you can find the rough-in dimensions. 12 inches is the “standard,” although the rough-in can range from 10 to 14 inches.

It’s also important to consider bowl shape and sizes if you have small bathrooms with a wall or vanity near the commode.

Toilet bowls come in two basic shapes with an elongated or round bowl. A toilet with a round bowl is more common and cheaper, while an elongated bowl provides more room.

White is the most popular color, but you can also find toilets in colors like Blue, Black, and Gold.

Pressure-Assisted or Gravity Flush Toilet?

There are over a half-dozen types of flushing systems used by toilet manufacturers today, but they all use gravity or pressure. The type of system used will impact the price and performance as well.

A pressure-assisted toilet provides a powerful flush by using compressed air inside the tank. These toilets can move a lot of waste and ensure your toilet stays clog-free but can be noisy. These systems can come under different names depending on the manufacturer.

Gravity-based toilets are far more common, although not as powerful as a commode with pressurized air. The weight of water and gravity create pressure when the toilet is flushed, which siphons water and waste from the bowl.

In many cases, a well-designed gravity toilet is just as effective as a pressure-assisted system. Parts in the flushing mechanisms are usually the first things replaced on a toilet. They also affect how much water your toilet uses to a degree, which brings us to the next area in our guide.

Water Consumption

When shopping for a toilet, water usage may be the last thing to come to mind. Well, if you live in certain states, you’ll need to pay close attention to a specification called GPF.

Whenever you see the term GPF, it means gallons per flush. This is the amount of water used whenever you flush a toilet, which is limited to 1.6 GPF by federal standards.

Toilets that are WaterSense certified are listed at 1.28 GPF and currently required in California.

Water consumption is also where single and dual-flush toilets come into play. Dual-flush toilets give you the option of using less water based on your needs. You can use one button for liquid waste and a more powerful flush for the solids.

Toilet Warranties

We always advise homeowners to consider the warranty with any products – even toilets. While bowls and tanks can last for decades, you might be surprised by the warranties and what they cover.

For example, KOHLER provides a lifetime limited warranty on Vitreous China, which toilets are made from. You’ll get 1-year on seats, and the coverage on mechanical components inside the tank range from 1-5 years.

It depends on the model and brands as some companies like Swiss Madison Well Made Forever provide blanket coverage that tops out at 1-year across the board.

Our Verdict

We hope you found the right fit for your home from our list of the best one-piece toilets. 

While the commodes on our list share plenty of similarities, the American Standard Champion 4 provides the best value overall for the average consumer.

Whether you’re looking for a budget-friendly toilet or a premium model with a built-in bidet, remember to keep our tips in mind.

Also, consider a professional installation if you’re uncomfortable dealing with plumbing. If you’re interested in adding ventilation to your bathroom along with that new toilet, we have that covered as well!

FAQ

Is a one-piece toilet noisier than a traditional commode?

The design or type of toilet won’t have an impact on noise. That comes down to the flushing mechanism and pressure when water refills the tank.

What is the MaP rating, and is it important with one-piece toilets?

The MaP score tells you how much solid waste a toilet can remove in one flush. It’s a voluntary program, and a “good” map score is in the 500 range, while premium toilets can top out at 1000 grams.

Are one-piece toilets easy to install?

Many homeowners find one-piece toilets easier to install than a traditional commode. With that in mind, issues from an improperly seated toilet or wax ring can be expensive, so don’t hesitate to call a plumber.

How do I find an ADA compliant one-piece commode?

For a toilet to qualify for ADA standards, it must have a height between 17-19″ from the floor to the bowl, including the seat.

What’s the best way to identify the model of a one-piece toilet?

In most cases, you simply need to lift the lid and look for the tank and toilet model number. On a two-piece toilet, the bowl model number could be on the underside of the bowl.

Do one-piece toilets come with supply lines or a wax ring?

You’ll need to check the individual listing as what’s included in the box can vary greatly from one manufacturer to the next. 

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