The Best One Piece Toilets – Complete 2021 Buyer’s Guide

| Last Updated: October 23, 2022

Whenever you are choosing a new toilet, it is important to choose one that matches your own personal preferences. Many people like the more modern styling and flush system of a one piece toilet. Not only do they have a sleek appearance, which means they can fit in a small bathroom, they also tend to be much easier to clean than a standard toilet.

If you are interested in a one piece toilet, we are here to help! Not only will our buyer’s guide explain everything you need to know about these toilets, we will be reviewing 7 of the best options on the market today!

Comparison of the Best One Piece Toilets

  • Uses two nozzles to efficiently rinse bowl
  • Gallons Per Flush: 1.28
  • Installation Method: Floor Mounted
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  • Best for the Money
  • Gallons Per Flush: 1.6
  • ‎Installation Method: Floor Mounted
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  • Best Kohler One Piece Toilet
  • Gallons Per Flush: 1.28
  • Installation Method: Floor Mounted
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  • Best Toto One Piece Toilet
  • Gallons Per Flush: 1.0 / 0.8
  • Installation Method: ‎Floor Mounted
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  • Best One Piece Dual Flush Toilet
  • Gallons Per Flush: 0.8 / 1.28
  • ‎Installation Method: Floor Mounted
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  • Best One Piece Round Toilet
  • Gallons Per Flush: 1.28
  • Installation Method: ‎Floor Mounted
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Factors to Consider Before Buying a One Piece Toilet

Before you search for a new one piece toilet, it is important to know what to look for. The following factors should always be taken into consideration before you make a purchase:

How Comfortable the Toilet Is

Given how many hours you will spend on your toilet over its lifetime, it is worth putting in some research to make sure you are choosing a comfortable seat option. Consider user reviews and comfort features, like an ergonomic seat and height.


While we might not think of a toilet as being a very glamorous purchase, the right model can have a major impact on the overall look of your bathroom. Make sure you are choosing an option that you think is stylish. It is also worth taking the time to find a modern toilet that is available in a color that matches your existing bathroom décor. Since you are choosing a single piece toilet, that probably means you prefer the modern look, so keep an eye out for a toilet that has a contemporary design.

Ease of Installation

The best toilets can be installed relatively quickly and without much hassle. Look for a toilet that does not require professional installation if you want to save a little bit of money.

KOHLER K-4007-0 San Souci

Bowl Type

You can typically find one piece toilets in either a rounded or an elongated bowl shape. An elongated bowl looks a bit more modern, but also takes up more room. Consider the space you have in your bathroom and base your decision off of this.

Water Conservation Rating

Choosing a toilet that was designed with water conservation in mind is a great way to save some money on your annual water bill, as well as do your part for the environment. Most toilets will list how many gallons of water they use per flush. The best options will also list how much water they save per year over a traditional flushing toilet. Many one piece toilets are also dual flush, which means you can use less water for getting rid of liquid waste.

How Easy the Toilet is to Clean

Toilets need to be cleaned fairly regularly, which is why it is worth choosing a one piece toilet that is easy to clean. The best toilets have easy-clean surfaces that can be wiped clean quickly and effectively with basic cleaning products. They are also sealed in a way that the color will not fade as a result of exposure to harsh chemicals, like bleach. 

Key Terms to Know

To help compare products in this review, we have included a few key specifications for each. Here is a quick summary of what they mean.

  • Gallons Per Flush (GPF): How much water is used when the toilet is flushed. This can be a single metric or include two metrics in the case of a dual flushing toilet (which flushes differently depending on whether you are flushing liquids only or solids, as well).

  • Installation Method: Whether the unit attaches to the floor or the wall. 

  • One-Piece or Two-Piece: This is whether the toilet is molded as one unit or the tank and base are separate. 

  • Dimensions and Weight: The height, length, width, and physical weight of the toilet.

  • Material: The main material(s) the toilet is made of.

  • Seat Shape (round or elongated): The compatible seat shape.

  • Maximum Weight Limit: The maximum amount of weight the toilet can support.

Reviews of the Best One Piece Toilets

Now that you know what to look for, we can go over our top 7 picks for the best one piece toilets:

Best Overall

TOTO UltraMax II Toilet

TOTO MS604114CEFG#01 UltraMax II Toilet, 1.28 GPF with SanaGloss, Cotton White


Gallons Per Flush (GPF): 1.28

Installation Method: Floor Mounted

Dimensions and Weight: 28 3/8 x 16 1/2 x 28 3/4″; 99 lbs

Material: Plastic

Seat Shape: Elongated

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The TOTO UltraMax II has an elongated, one-piece design and is built to universal height standards, which means it is optimized for comfort. Its sleek design will look great in just about any bathroom, and the unique exterior glaze ensures it will not fade over time. The fact it is also bacteria and mold resistant is really helpful, as it makes it much easier to clean the inside and outside of the toilet.

What really sets the UltraMax II apart is its incredibly powerful flushing force. Despite the fact that it is designed to use less water than a conventional toilet, it can remove waste quickly and effectively, especially when you use the secondary flush, which releases more water. This is partially helped by the fact that there is less space between the tank and the bowl than a typical toilet. Less space means the water gets there faster and with more force. 

Bottom Line

TOTO is known for offering some of the highest quality toilets and bathroom accessories, and this one piece toilet is no exception. If you value flushing power, you cannot go wrong with the UltraMax II. As is always the case with TOTO, it is also backed by great customer service!


Stylish design

Easy to install

Dual flushing saves water

Fittings and lever are chrome plated 

TOTO’s patented Double Cyclone Flushing System


Only available in one color

Best for the Money

American Standard Champion 4

American Standard 2034314.020 Champion 4 One-Piece Toilet with Seat Elongated Chair Height, White


Gallons Per Flush (GPF): 1.6

Installation Method: ‎Floor Mounted

Dimensions and Weight: 29-3/4 x 17-3/4 x 29-1/2 ; 111 lbs

Material: Vitreous China

Seat Shape: ‎Elongated

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The American Standard Champion 4 combines the traditional looks with the more modern styling of an elongated, one-piece toilet design. It features an ‘EverClean’ exterior surface coating, which makes it easier to clean the toilet. It also means you can clean the surface with bleach and other harsh chemicals, without having to worry that the toilet will fade or discolor.

It uses American Standard’s patented ‘4 Piston Accelerator’ flushing valve, which means it can eliminate waste quickly and effectively with even less water than a standard toilet. The slow-close toilet seat is a nice touch, as it prevents unnecessary slamming noises and is safer for small children.

While it can be a little bit loud when it is flushed, this is to be expected given how powerful it is.

Bottom Line

If you are looking for a budget-friendly one-piece toilet that works just as well as any of the high-end options, the Champion 4 from American Standard is a great place to start. It offers some excellent features and works exceptionally well!


Affordable price

Includes a slow-close toilet seat

Available in three distinct colors

Unique ‘EverClean’ surface prevents the buildup of mold and bacteria

Designed to cut down on water waste and only uses 1.6 gallons per flush


The flush is somewhat loud

Best Kohler One Piece Toilet

Kohler 3810-95 Santa Rosa

Kohler 3810-95 Santa Rosa Comfort Height Elongated 1.28 GPF Toilet with AquaPiston Flush Technology and Left-Hand Trip Lever, Ice Grey


Gallons Per Flush (GPF): 1.28

Installation Method: Floor Mounted

Dimensions and Weight: ‎31 x 20.75 x 29″; 102 lbs

Material: Vitreous China

Seat Shape: ‎Elongated

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Kohler is known for making high-quality toilets with innovative features, so it is no surprise that the 3810-95 Santa Rosa One Piece Elongated Toilet is made to an extremely high standard. What we liked the most is how powerful the 1.28 GPF flush actually is. While 1.28 gallons is not a massive amount of water, Kohler gets the most out of it with their patented Aqua Piston Canister flush, which forces water into the bowl from all sides. This ensures each flush quickly and effectively removes all waste.

We also liked how comfortable this toilet is, as well as the fact that it is available in several different colors, so you can match it to the existing décor and paint in your bathroom. Overall, it is an outstanding toilet, which is about what we have come to expect from Kohler products.

Bottom Line

If you are looking for a one piece toilet that can handle all of the basics and last, look no further than the Kohler 3810-95 Santa Rosa. It is a really well-made toilet that offers an effective flush and an impressive level of durability.


Very easy to clean and disinfect

Compact elongated bowl is comfortable, yet saves space

Extremely durable design means it will not leak or crack

Comfortable height makes it easier for those with mobility issues to use

Unique ‘Aqua Piston Canister’ means water flows from all sides of the bowl, which creates a more effective flush


Somewhat expensive; however, Kohler is not considered an entry-level brand

Best Toto One Piece Toilet

TOTO Neorest 700H

Toto MS992CUMFG#01 Neorest Bathroom-Hardware, Cotton White


Gallons Per Flush (GPF): 1.0

Installation Method: ‎Floor Mounted

Dimensions and Weight: 32.5 x 15.5 x 21.5″; 106 lbs

Material: ‎Ceramic with SanaGloss

Seat Shape: ‎Elongated

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This unique toilet offers all of the modern features you could ever want. Those that prefer the modern look will really enjoy its low-profile, tankless design. Fortunately, this little toilet offers more than looks, as it packs a wide variety of advanced features. These include a built-in bidet seat. The bidet has plenty of different spray modes, including oscillating, pulsating, and solid sprays.

It is also a dual flush toilet, which means  it can conserve over 1 gallon of water per flush when compared to a traditional toilet. It even has an auto open and close lid and seat, which can be really beneficial for seniors and those with mobility issues. A gentle night light also helps you navigate the bathroom at night. Hands-free flushing technology is another nice feature that really makes this futuristic toilet stand out.

Bottom Line

If you are the type of person that enjoys buying the latest technology, the TOTO Neorest 700H Dual Flush Toilet and Bidet could be just what you are looking for. It offers just about anything you could ever want from a toilet, including a bidet, dual flush design, and a built-in nightlight. Overall, it is an incredible toilet, just remember that it can be somewhat difficult to install.


Auto open and close lid

Incredibly lightweight compared to a traditional toilet

Tankless, low-profile design looks very unique and modern

Built-in bidet seat offers a variety of spray and temperature modes

TOTO’s unique ‘Cefiontect’ ceramic glaze keeps the exterior and interior surfaces clean


Unique design means it is more difficult to install than a traditional toilet

Best One Piece Dual Flush Toilet

Swiss Madison SM-1T254

Swiss Madison Well Made Forever SM-1T254 St. Tropez One Piece Toilet, 26.6 x 15 x 31 inches, Glossy White


Gallons Per Flush (GPF): 0.8/1.28

Installation Method: ‎Floor Mounted

Dimensions and Weight: 26.6 x 15 x 31″; 120 lbs

Material: ‎Ceramic

Seat Shape: Elongated

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This stylish dual flush toilet from Swiss Madison is an excellent choice for anyone that is looking for a toilet that combines sophistication with performance. The seamless design means that it has a modern appearance and it is much easier to clean than a traditional two-piece toilet. The quick-release lid and seat also help with cleaning and the slow close design means the seat will not slam when closed. The glazed trap-way also helps make the toilet easier to clean than most.

The choice between a 0.8 or a 1.28-gallon flush helps you conserve water. The top-mounted, chrome flush buttons also look great. To give the toilet an even more modern look, all of the bolts are receded and covered with chrome plated caps. 

Bottom Line

If you are looking for a fairly simple one piece, dual flush toilet, the Swiss Madison SM-1T254 St. Tropez Toilet is an excellent choice. The option to choose from three different colors is a bonus, as it helps you match the toilet to your existing fixtures and décor. Overall, it is an excellent one piece, dual flush toilet that is available at a very reasonable price.


Available in three unique colors

Fully skirted trap-way makes it easier to clean

Dual ‘Tornado Flush’ 0.8 and 1.28 GPF options

Includes a quick-release, soft closing seat and lid

Modern design, including chrome plated buttons and hinge covers


Somewhat difficult to install

Best One Piece Round Toilet

KOHLER K-4007-96 San Souci

KOHLER K-4007-96 4007-96 Toilet, One Size, Biscuit


Gallons Per Flush (GPF): 1.28

Installation Method: ‎Floor Mounted

Dimensions and Weight: 30.5 x 21 x 29.25″; 92 lbs

Material: ‎Vitreous China

Seat Shape: Round

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The Kohler K-4007-96 San Souci Round-Front Toilet is the ideal choice for anyone that is limited on bathroom space. The low-profile design gives it a modern look, while the narrow, rounded bowl helps cut down on the length of the toilet. 

While the looks are impressive, it is the performance that really stands out to us. As with the other Kohler toilet on our list, the San Souci features Aqua Piston Flushing Technology, which means water is ejected from all sides of the bowl when you pull the flushing lever. This washes away waste far more effectively than a traditional flushing toilet. It also keeps the bowl cleaner for longer, so you do not have to use your toilet brush nearly as often.

As we have come to expect from Kohler products, it is made extremely well and will not crack, fade, leak, or break nearly as fast as you would find with a lower quality toilet.

Bottom Line

If you are limited on space and like the look of a one-piece toilet, the Kohler San Souci simply is one of the best options on the market today. It works exceptionally well and has a stylish appearance. Just remember that this toilet is fairly low to the ground, which could be an issue if it will be used by a senior, or anyone that has mobility issues.


Available in two different colors

Rounded front bowl is ideal for smaller bathrooms

Low-profile, one piece design gives it a stylish appearance

Kohler’s unique Aqua Piston Canister allows for a 360-degree flush

Durable canister design means it will not leak or wear out as quickly as other toilets


The reduced height might be less comfortable and accessible for those with mobility issues


WOODBRIDGE Pure White, Dual Flush Elongated One Piece Toilet with Soft Closing Seat, Comfort Height, Water Sense, High-Efficiency, Rectangle Button, T-0001


Gallons Per Flush (GPF): 1.0 /1.6

Installation Method: Floor Mounted

Dimensions and Weight: 31 x 18 x 28″; ‎118.7 lbs

Material: Stainless Steel, Plastic

Seat Shape: ‎Elongated

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This toilet is incredibly stylish, which is no surprise when you consider the fact that Woodbridge designs and manufactures all of its products in California and are known to have some of the most eye-catching designs in the industry. This sleek, one-piece toilet would not look out of place in even the most modern bathrooms.

The main feature we liked about this particular toilet is the fact that it offers dual flushing options. This means you can choose between a water-saving  1.0-gallon flush, or a 1.6-gallon flush. Using less water to remove liquid waste saves a tremendous amount of water over the course of an entire year. We also liked other features, like the comfortable, easy-close seat.

It is really easy to install and Woodbridge backs the toilet with 24/7 customer support and a 1-year warranty!

Bottom Line

If you are looking to cut down on water usage and install a modern-looking, one-piece toilet that is both comfortable and stylish, you cannot go wrong with the Woodbridge T-0001 Dual Flushing Elongated Comfort Toilet. It has a minimalist appearance that we think looks outstanding!


Comfortable height

Modern, low-profile design

Water saving dual flush design

Comes with a soft closing toilet seat with stainless steel hinges

Concealed trap-way and one-piece design makes it really easy to clean


Fairly expensive when compared to other one piece options

What is a One Piece Toilet?

One-piece toilets operate the same way as a traditional two-piece toilet, but the tank and bowl are fused, which gives them a more modern appearance and makes them much easier to clean. While they can be fairly heavy, one-piece toilets are also easier to install, as they consist of fewer components. They also lack drill holes that would support the water tank, which means they tend to be more stable and less susceptible to cracks and threading issues.

While one-piece toilets offer many advantages, they also tend to be shorter, which can be an issue for taller people, as well as seniors and those that have difficulty bending at the knees.

One Piece Toilets vs Two Piece Toilets – Comparison Overview

Given that most people choose between either a one-piece toilet, or a two-piece toilet, it makes sense to compare the two.

Which is Better, a One Piece or a Two Piece Toilet?

As mentioned above, one-piece toilets offer many advantages over the more traditional two-piece toilets. For starters, they have a more sleek and modern appearance. If you are outfitting a bathroom and want it to have a more contemporary look, you will probably lean towards the more modern look you would get with a one-piece toilet.

One-piece toilets are also much easier to clean, as dirt, mold, mildew, and bacteria cannot grow and spread in the gap between the toilet tank and the toilet bowl. Having a seamless exterior also means that one-piece toilets can be wiped down with a cloth and cleaning product much easier.

On the other hand, some people like the traditional look of a two-piece toilet, especially if it is going to be used in an older home. Two-piece toilets are also taller, which can be a benefit for some people, especially those that struggle to bend at the knees.

Essentially, there is no better option, as it is mostly a personal preference issue. If you are more drawn to a one-piece toilet, that is the type you should choose!

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Top Brands in the One Piece Toilet Space

Now that we have reviewed our top picks, we can take a more in-depth look at some of the best brands in the one-piece toilet industry:


KOHLER is known for making stylish and modern kitchen and bathroom products. Their toilets are usually designed to last and feature highly efficient flushing systems that conserve water and still eliminate waste effectively. They are widely recognized for having some of the highest quality toilets on the market and their one-piece toilets look great. 

American Standard

American Standard is one of North America’s leading plumbing supply brands. They also manufacture a wide range of high-performance toilets in both one-piece and two-piece configurations. Their toilets range from traditional styles to the most modern designs. The fact that the American Standard brand has been making toilets and plumbing supplies for over 140 years is a testament to the brand’s enduring quality. Most of their toilets have simple designs, but they work exceptionally well!


TOTO toilets are known for their lasting quality. This is because the brand makes sure all of their bathroom and kitchen products are designed to be as durable as possible. When it comes to one-piece toilets, the brand also focuses on comfort and water efficiency, so they tend to have comfortable seats and use less water per flush than other brands. They often have a dual flush design, which helps save water over their lifespan. If you like the modern look, you will probably like what TOTO has to offer.

Price Points of a One Piece Toilet

To help know how much you will have to spend, we are going to go over some of the main price ranges for a new one-piece toilet:

$100 – $300

One-piece toilets in this price range are considered to be entry-level options, which means they will have a basic design and simple flushing mechanism. They also lack the extra features you would get with a higher-end one-piece toilet. It is also common for toilets in this price range to lack a seat and lid, so make sure you are aware of what your toilet comes with before you purchase it.

American Standard Champion 4

$300 – $500

This is considered to be the mid-range level for one-piece toilets. Typically, these toilets are made to a better standard and have useful features, like bacteria-resistant surfaces and powerful flushes. You can also find some really stylish one-piece toilets in this price range.

$500 +

Once you get over $500, you are into the high-end dual flush toilet category. These toilets usually have some of the more luxurious features, like extra-quiet flushes, built-in bidets, quiet-close seats, and more. They also tend to have the latest designs, so they look more stylish in a modern bathroom.


One-piece toilets can look really stylish, especially if they match the décor and fixtures in the bathroom where they are installed. Choosing the right one for your needs does not have to be difficult. Simply read over our reviews and choose the one-piece toilet that comes closest to matching your own personal preferences!

People Also Ask

Why Are One-Piece Toilets More Expensive?

The reason why one-piece toilets tend to be more expensive than two-piece toilets is the fact that they are usually made with more modern features. If you are put off by the price, look for a one-piece toilet that only has the basics. For example, consider our budget-friendly option – the American Standard Champion 4.

Can You Replace a 2 Piece Toilet With a 1 Piece Toilet?

Yes, you can easily replace a two-piece toilet with a one-piece toilet. Once the old two-piece toilet has been removed, the one-piece can be installed exactly where the old toilet was sitting. The toilets actually have a very similar installation process, so one will fit where the other was.

What Is the Advantage of a One Piece Toilet?

Beyond their more modern appearance, one-piece toilets are also easier to clean. This is because bacteria, dirt, mold, and mildew cannot get trapped because there is no gap or seam between the tank and bowl.

How Much Does a One Piece Toilet Weigh?

The average for a one-piece toilet is roughly 88 lbs., so they can require two people during installation. Some are a little bit lighter than others, so just make sure you know the weight before you attempt to lift it.

Welcome! We hope you’ll find the job costs of home improvement projects useful when you’re deciding whether to do a job yourself vs. hire a contractor. We’re the authors of 20 home improvement books, most notably Home Improvement for Dummies©, Bathroom Remodeling for Dummies©, Carpentry for Dummies©, Plumbing for Dummies©, and Painting and Wallpapering for Dummies©. Our most recent book Fix It and Flip It is in its second edition. We’ve appeared as home improvement experts on television programs such as CNN, Dateline, the Today Show, HGTV and many others.