Best One Piece Toilets of 2023: Complete Reviews With Comparisons

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Are you out in the market searching for brand-new toilets for your newly constructed house?

Otherwise, do you want a replacement fixture for an old bathroom at home?

Whichever the case, we recommend you get the best one-piece toilet that suits your needs.

While one-piece toilets are slightly more challenging to install, they are easier to clean because they lack the multiple crevices two-piece toilets have.

To help you get things going, we’re here to present five excellent quality one-piece toilets, and we will discuss each of their features.

Best One Piece Toilet Reviews

1. American Standard Champion 4 Elongated One-Piece Toilet

The American Standard brand has been around as early as 1929, manufacturing bathroom and kitchen fixtures.

As it continues to innovate its vast array of product lines, you might find it challenging to settle on a single item.

An advantage of the American Standard brand is its timeless exceptional quality offerings at more competitive prices.

One of the company’s notable one-piece toilets is the Champion 4 Elongated Right Height Toilet.

It features a 16.5-inch rim height and includes a color-matched Champion slow-closing toilet seat, bringing the seating height to 18.44 inches.

Its nominal dimensions are 29.75 by 17.75 by 29.5 inches.

The bowl has a siphon action jet design, while the non-adjustable, single-flushing mechanism uses a piston action accelerator valve.

With the gravity-fed flushing technology, a single flush can deliver a maximum of 1.6 gallons of water.

The available colors for the Champion 4 Elongated One-Piece Toilet are white, bone, and linen.


We like that this toilet boasts a flush almost twice as fast and powerful as other standard toilets.

It delivers clog-free performance and maintains quiet water movement during every dump.

Combined with the non-slamming slow-close toilet seat, the silent flushing ensures a quieter, more peaceful household.

While some might prefer toilets with lower rim heights, the Champion stays at the average recommended toilet seat height for ease of use and comfort.

In addition to being an easy-to-clean one-piece toilet, the Champion has a fully-glazed 2.38-inch trapway.

American Standard also equipped it with its EverClean Surface technology.

No matter what toilet cleaner you use, these features ensure that your toilet is easier to keep clean, even after several years of operation.

The only disadvantage with the Champion 4 Elongated One-Piece Toilet is the exposed curves forming the siphon jet system.

These curves make it easier for mold and mildew to latch onto the surfaces of the joints and crevices.


  • Mid-range pricing
  • Value for money option
  • Low water consumption
  • Comes with a 10-year warranty


  • No tank insulation
  • Other toilets can save more water
  • Single flush only

2. Swiss Madison St. Tropez Elongated One-Piece Toilet

While most American Standard toilets seem to stick to the form and design of previous-generation bathroom fixtures, Swiss Madison offers a more modern touch.

This company may have only begun in 2016, but its R and D department has made strides to get the company into the competition.

Its members pride themselves in producing well-made-forever products that tend to bring modern luxury into any space.

The St. Tropez Elongated Toilet is just one of the many one-piece offerings from Swiss Madison and does not fail to amaze.

It is a durable ceramic toilet bowl with a high-performance vortex mechanism for dual flushing.

While it consumes 1.6 gallons per large-button flush, it only uses 1.1 gallons with the small-button flusher.

Its nominal dimensions are 31.19 by 15.13 by 27 inches, which means it occupies a smaller footprint than the Champion 4.

Also, the St. Tropez Elongated One-Piece Toilet is available in white, matte black, matte white, and bisque.


Unlike the Champion 4, the St. Tropez has a skirted trapway, concealing the drain system and dead space underneath the seat.

Additionally, the included toilet seat is both soft-closing and quick-releasing.

All these features combined ensure that the St. Tropez allows unmatched ease of cleaning.

Since the St. Tropez One-Piece Toilet is also an elongated toilet, it can add comfort for every use.

However, its overall front-to-rear length of 27 inches makes it slightly shorter than the Champion 4.

While this is great for tightly spaced bathrooms, it may not provide enough wiggling room, especially for men and kids.


  • Most affordable among the options
  • Has a dual-flushing system
  • Almost no crevices for dirt and mold to latch onto
  • Quick-release toilet seat
  • Available in black


  • Some difficulty with the installation
  • Sometimes needs a second flush
  • Small tank capacity

3. Kohler San Souci Round-Front One-Piece Toilet

Kohler is one of the oldest and biggest names in the kitchen and bathroom fixtures industry, which means it may not even need an introduction.

Nevertheless, it behooves you to know that you are making an excellent product choice from a company that planted its roots way back in 1873.

Enter the Kohler San Souci Round-Front One-Piece Toilet.

Unlike the alternatives, the San Souci is the only round-front option here.

It is only 25.63 inches long, albeit 16.75 inches wide.

While it may have a slightly more compact tank than other toilets, the San Souci only uses 1.28 gallons of water in a single flush.

This feature allows significant water savings of up to 16,500 gallons each year compared to other toilets.

Furthermore, it uses precision-engineered components to ensure each water-saving flush does not sacrifice performance.

One of its design features is the AquaPiston canister, an expertly formed interior enabling water to flow from all directions for increased flushing power.

The San Souci Round-Front One-Piece Toilet also comes with Kohler’s Quiet-Close, Grip-Tight toilet seat.

Color options include white, Biscuit, Dune, Ice Grey, Thunder Gray, and black.


The Kohler San Souci Round-Front One-Piece Toilet is ideal for powder rooms and smaller bathrooms because of its round-front design.

It may be slightly wider than the St. Tropez, but Kohler keeps this seating width based on average anthropometrics.

This toilet also has a low-profile design. Its height only measures 24.25 inches, which means it does not require much headroom underneath bathroom shelves.

Performance-wise, the San Souci Round-Front One-Piece Toilet can attest to many years of optimized, problem-free flush performance.

Its seal and unique canister design eliminate leaks commonly associated with rubber tank bottom flappers.

Since it can save up to 16,500 gallons of water annually, this toilet carries a WaterSense certification for water efficiency.

The only off-putting thing about the San Souci is its staggeringly higher price than the St. Tropez or Champion 4.

If you check out even the next remaining products, you will find that this toilet requires the largest investment on your part.


  • Compact, saves space
  • Exceptional flushing
  • Saves a lot of water
  • Seamless, easy-to-clean design
  • Light-touch flush lever


  • Most expensive among the options
  • Does not include a water supply line
  • No dual flushing option

4. Toto Ultramax II Elongated One-Piece Toilet

Liko Kohler, Toto is another plumbing fixture giant most of you have probably heard of already.

Although founded almost 50 years after the inception of Kohler, Toto is now one of its leading competitors.

In fact, Toto spearheaded the innovations on washlets and is currently the world’s largest manufacturer of toilets.

If you don’t know what a washlet is, it is a toilet seat with a built-in bidet system.

While Toto has been making electronic button-operated washlets for a long time now, it is only recently that other brands have manufactured manual washlets.

This gap in plumbing fixture technology shows that Toto has always been way ahead of most competitors.

However, since Toto toilets with built-in washlets tend to break the bank, let’s get back to our object of focus.

One of Toto’s one-piece products is the Ultramax II Elongated Toilet.

This toilet features the brand’s leading Tornado Flush flushing system that draws water into the bowl quickly and out more forcefully.

The Ultramax II measures 28.75 inches tall, 16.63 inches wide, and 28.38 inches long.

Its design is reminiscent of the Champion 4 from American Standard, but it is slightly smaller on all dimensions.

It comes with a SoftClose seat, a chrome trip lever, and a computer-designed, fully-glazed trapway.

Like the Kohler San Souci, the Ultramax II from Toto only uses 1.28 gallons of water for a single flush.

Its available color tones include Cotton, Bone, Colonial White, Sedona Beige, and Ebony.


Generally, Toto bathroom fixtures cost more than similar Kohler alternatives.

However, in this case, the Ultramax II is slightly more affordable than the product we discussed in the previous section.

Conventional ceramic toilet bowls may appear perfectly smooth to the eyes, but their non-glazed surfaces tend to repel water and collect dirt.

The good thing about every Ultramax II is the use of Toto’s CeFiONtect, an ultra-smooth ceramic glaze coating the entire toilet bowl.

It has microscopic ceramic ridges that are more minute than any waste particle, preventing debris from gaining a foothold.

This ceramic glaze makes the bowl surface hydrophilic, which means it attracts and spreads water with ease.

As such, it can encourage easy washing away of particles.

Also, it is exceptionally durable, keeping the toilet bowl clean and beautiful for a very long time.

Like the San Souci, the Ultramax II Elongated One-Piece Toilet boasts a WaterSense certification for exceptional water conservation capabilities.


  • Exceptional water savings.
  • More compact than the Champion 4.
  • Universal height.
  • Decorative, high-profile design.
  • Easy to clean.


  • One of the more expensive choices.
  • High profile prevents placement under fixed shelves.
  • An exposed trapway exterior can accumulate mold.

5. Woodbridge Deluxe Square Design Elongated One-Piece Toilet

Woodbridge has been manufacturing bathroom products since 2005.

It is a company that takes pride in delivering high-quality products that can go head-to-head with alternatives from leading brands.

What’s more, their products tend to have more reasonable prices.

Let’s take a look at one of Woodbridge’s one-piece toilet offerings – the B0921 Square Design Elongated Toilet.

It measures 30 by 18 by 31 inches, making it the largest among the choices on this list.

Its features include a dual flushing siphon mechanism and a high-quality soft-closing seat with durable stainless steel hinges.

Compared to Swiss Madison’s St. Tropez, this Woodbridge toilet boasts a WaterSense Certificate for high efficiency in water consumption.

This particular toilet model is only available in black and white variants.

Woodbridge offers its flush controls in varying finishes only for the white variant.

Options include stainless steel, oil-rubbed bronze, brushed gold, brushed nickel, and matte black.


If you’re looking for something that looks strikingly more contemporary, the square-shaped Woodbridge Deluxe is in with the new.

With it, you can significantly alter the appearance of your bathroom.

Also, since it does not curve to the front as much as the other options, it features a wider forward basin and allows scatter-free peeing.

However, the Deluxe Square Design Elongated One-Piece Toilet is the largest option on this list.

In addition to the skirted trap way, it can be very heavy and bulky and, therefore, quite challenging to set in its final position.

Although its square, edgy design can be a bit of a turn-on, it can also put you off by not sitting you comfortably.

Luckily for you, the Deluxe Square Design Elongated One-Piece Toilet’s extra-wide girth ensures that you have enough space for sitting.

While the skirted trap-way makes cleaning easier, it also creates a sleek look that enables the fixture to complement different interior design styles.

Another advantage is the included toilet seat’s stainless steel hinges.

Aside from having a quick-release design for easy tightening or cleaning, it also ensures that the seat never loosens.


  • One of the more affordable choices
  • The only square-front option on the list
  • Ultra-modern appearance
  • Dual flushing
  • Skirted trapway
  • Effortless cleaning


  • Challenging installation process
  • Bulkier than alternatives
  • Straight edges might be uncomfortable to sit on

Which Is the Best One-Piece Toilet?

The American Standard Champion 4 Elongated One Piece Toilet

It may not be the most affordable, but it certainly offers better value than more expensive alternatives.

Furthermore, it features a timeless look, which can go well with other similarly colored fixtures in the same bathroom.

When purchasing a replacement toilet, consider any one of these easy-to-clean one-piece options.

Also, don’t forget to get a matching toilet paper holder to go with your brand-new toilet.

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