Two-piece toilets tend to be the most common, but investing in a one-piece toilet can give your bathroom a sleek, seamless look. Another benefit is that as one piece, they are easier to clean which is always a plus.
Below we share some considerations when looking for a new toilet, and our top choices for the best one-piece toilets!
Table of Contents
- Comparison of the Best One-Piece Toilets in 2022
- Our Top Picks
- Unique Features of One-Piece Toilets
- Reviews of the Top 11 One-Piece Toilets
- 1. Kohler Veil – Editor’s Choice
- 2. TOTO Neorest – Most Water Efficient
- 3. American Standard Champion 4 – Strongest Flush
- 4. Woodbridge T-0001-CH – Review Champion
- 5. Kohler Santa Rosa – Most Reviewed
- 6. TOTO Eco Ultramax – Runner Up
- 7. TOTO Eco Soiree
- 8. TOTO Ultramax
- 9. Kohler Santa Rosa
- 10. Kohler Kathryn
- 11. SaniCanada 942
- Choosing a One-Piece Toilet
- Advantages of One-Piece Toilets
- Few Disadvantages
- Installation Process
- Frequently Asked Questions
Comparison of the Best One-Piece Toilets in 2022
Our Top Picks
| • | Kohler Veil | |
| • | Most Water Efficient: | TOTO Neorest |
| • | American Standard Champion 4 | |
| • | WoodBridge T-0001-CH | |
| • | Most Reviewed: | Kohler Santa Rosa |
| • | Runner Up: | TOTO Eco Ultramax |
Unique Features of One-Piece Toilets
The best one-piece toilets have some unique features that set them apart from casual models, especially when it comes to high-quality units. Let’s discuss three highlighted features.
Design & Materials
The standard toilet height is around 15 inches. However, you might see units with 16 or 17-inch seat height. Those couple of extra inches provide nice support to both knees and ankles but can be harder for children. Depending on who will be using the toilet, you may want a shorter or taller height.
When it comes to construction, toilets are usually made from porcelain or ceramic. You can even find plastic ones, but those are usually not very durable. Sticking to a model made from porcelain or ceramic typically helps ensure a durable, leak-free option for many years.
Flush Type Considerations
Similar to toilet bowls, there are also several types of flush technology to consider. Sometimes, different toilet brands will also feature specific flush technology. Here are some of the main options:
- Gravity Flush – Gravity flush is the most common flushing option. Basically, the weight of the water builds pressure which then empties and cleans the bowl. This option is also pretty quiet and requires very low maintenance.
- Pressure Flush – Pressure flush toilets usually have a special air tank that is under pressure. This tank creates a more powerful flush but is also noisier. On the other hand, a pressure flush is much better at removing waste due to the added force from the tank.
- Dual Flush – The main advantage of this type is its water-saving efficiency. Basically, a dual-flush toilet allows you to choose either a half-flush for liquid waste or a full flush for solid waste. By only using a half-flush for liquid waste, you’re able to both protect the environment and reduce your monthly water bills.
Bowl Shape Considerations
- Elongated: Generally speaking, elongated, or oval, bowls are better than their round counterparts in every way. They provide more comfort and are usually slightly bigger, making them ideal for children who are just learning to use an adult toilet.
- Round Bowl: Round bowls are usually 5-6 inches smaller than elongated bowls, so they’re a great choice for a small bathroom. While they do save space, round bowls are also less comfortable.
Reviews of the Top 11 One-Piece Toilets
1. Kohler Veil – Editor’s Choice
“The editor loved this unit for its comfort, technology and packed with customizable features. We highly recommend.”
- Flushing Score:
- Water Consumption: 0.8/1.19
- Bowl Shape:
- Flushing System: Pump-assisted flushing
- Flush Type:
- Dimensions (sourced from manual): Toilet (26.13″ x 17.25″ x 21.46″), (12″), (17.44″)See image with dimensions
- Its high-tech features allow users to customize settings to their liking.
- The Comfort Height features provides comfortable sitting support.
- The cleansing elements and deodorization system automatically kill lingering bacteria.
- The occasional weak flushing mechanism.
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
Our Take on the Reviews
The Kohler Veil has overwhelming positive reviews, with customers boasting about the heated seat, night-light, and hands-free open/closing features. Most users agree the toilet is a high-quality investment piece. Some customers mention the toilet’s installation may be a bit difficult for certain plumbers due to the model’s weight.
2. TOTO Neorest – Most Water Efficient
- Flushing Score:
- Water Consumption: 0.8/1.0
- Bowl Shape:
- Flushing System:
- Flush Type:
- Style: One-Piece
- Dimensions (sourced from manual): Toilet (31.46″ x 17.64″ x 20.75″), (12″), (17.25″)See image with dimensions
Performance Ratings
★ Softness – 4.8 out of 5
★ Comfort – 5 out of 5
* based on Amazon’s rating system
Additional Models
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- Hand-free automatic flush and temperature setting
- Sleek design fits in with any bathroom
- Highly water efficient using only 0.8-1 gallon per flush
- Non-sticky surface prevents staining
- Poor customer support experiences reported
- Expensive compared to similiar options
Summary of Recent Reviews
Buyers agree that this toilet is worth the hefty price tag! This stylish toilet is an investment for your home. Along with the effective flush, it includes features to assist with your personal hygiene. The seat is comfortable and is heated for additional comfort. “I’m going to start this by saying, BUY THIS! Yeah, it’s expensive, but you’re worth it!”
3. American Standard Champion 4 – Strongest Flush
- Flushing Score:
- Water Consumption: 1.6
- Bowl Shape:
- Flushing System: Champion® 4 Flushing System
- Flush Type: Single
- Dimensions (sourced from manual): Toilet (29.75″ x 16.75″ x 29.5″), (12″), (2.37″), (17.25″)See image with dimensions
Performance Ratings
★ Easy to Clean – 4.6 out of 5
★ Easy to Install – 4.4 out of 5
★ Value for money – 4 out of 5
* based on Amazon’s rating system
Seat Options
- Champion® Slow Close Elongated #5325.010
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- Very comfortable design
- Flushing systems is quiet
- Powerful flush that reduces clogging
- EverClean surface minimizes staining
- A bit pricey for a toilet
Summary of Recent Reviews
This comfort height toilet is a favorite among reviewers. Several mention its powerful flush, with many stating they’ve yet to have a clog. Reviewers love the look of this toilet, sharing that it compliments most bathroom designs. Some buyers didn’t find the seat comfortable, so consider buying a seat separately.
4. Woodbridge T-0001-CH – Review Champion
- Flushing Score:
- Water Consumption: 1.0/1.6
- Bowl Shape:
- Flushing System:
- Flush Type:
- Style: One-Piece
- Dimensions (sourced from manual): Toilet (28.5″ x 14.5″ x 27.5″), (12″), (2.12″), (17.44″)See image with dimensions
Performance Ratings
★ Easy to Install – 4 out of 5
* based on Amazon’s rating system
Additional Models
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- EPA WaterSense certified saves on water
- Optimal seat height for extra comfort
- All tools and a clear instruction booklet is included in the packaging
- Easy to clean and install
- Flush buttons tend to stick over time
- Water line can be difficult to attach
Summary of Recent Reviews
Buyers like the power of this flush, and that it has a dual flush option, allowing you to save on water. The flush is powerful, and the one-piece gives a clean, stylish look. Several mentioned that this install is a little challenging so consider hiring a professional if you aren’t experienced.
5. Kohler Santa Rosa – Most Reviewed
- Flushing Score:
- Water Consumption: 1.28
- Bowl Shape:
- Flushing System:
- Flush Type: Single
- Dimensions (sourced from manual): Toilet (27.75″ x 18.75″ x 28.19″), (12″), (17.25″)See image with dimensions
Performance Ratings
★ Easy to Clean – 4.7 out of 5
★ Easy to Install – 4.6 out of 5
* based on Amazon’s rating system
Seat Options
- K-75796 Cachet® Nightlight Quiet-Close™ Elongated seat
- K-8298 C³®-155 Elongated bidet seat
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- Strong flush keeps bowl clean
- Water-efficient systems reduces your water bill
- Available in several colors including black
- Durable design holds up over time
- The flush system parts were reported to break after some time
Summary of Recent Reviews
“UPDATE AFTER 1 YEAR OF OWNERSHIP: STILL WORKS LIKE A CHAMP!” Customers are pleased with this durable, efficient toilet. Some were not happy with the included seat, so maybe consider buying one separately. The comfort height makes this a comfortable toilet that would be a great addition to any bathroom.
6. TOTO Eco Ultramax – Runner Up
- Flushing Score:
- Water Consumption: 1.28
- Bowl Shape:
- Flushing System:
- Flush Type: Single
- Dimensions (sourced from manual): Toilet (28.25″ x 16.62″ x 27.16″), (12″), (15.7″)See image with dimensions
Seat Options
- SS114 SoftClose seat
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- Sleek and elegant design for a modern look
- Good price for a one-piece toilet
- Water-efficient flush system
- Comfort height adds a touch of elegance
- Some installation parts were missing from packaging
Summary of Recent Reviews
This toilet was an easy install for most buyers. The flush is powerful, leaving a clog-free, clean bowl for most reviewers. This also comes with a soft-close seat which means one less accessory to purchase. The tank is smaller than older models, lending itself to a sleek, modern look.
7. TOTO Eco Soiree
- Flushing Score:
- Water Consumption: 1.28
- Bowl Shape:
- Flushing System:
- Flush Type: Single
- Style: One-Piece
- Dimensions (sourced from manual): Toilet (28.13″ x 17.7″ x 27.75″), (12″), (2.12″), (17.37″)See image with dimensions
Performance Ratings
★ Easy to Clean – 4.5 out of 5
★ Easy to Install – 4.2 out of 5
* based on Amazon’s rating system
Seat Options
- SS214 SoftClose seat
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- ADA certified for those with mobility challenges
- Chrome plated lever for a nice finish
- Uses minimal amount of water to flush
- 17.37 inches universal height for added comfort
- SoftClose seat eliminates lid slamming
- The bottom drain is not symmetrical
- Some customers have reported receiving toilets with a deformed bowl
Summary of Recent Reviews
Customers are happy with the flushing power of this toilet. Some reviews stated that they had clogging issues with their previous toilet but replacing it with this one fixed that problem. There is some mention of it being a little loud but most agree it's worth it for the flushing power.
8. TOTO Ultramax
- Flushing Score:
- Water Consumption: 1.6
- Bowl Shape:
- Flushing System:
- Flush Type: Single
- Dimensions (sourced from manual): Toilet (28.12″ x 16.61″ x 27.16″), (12″), (15.7″)See image with dimensions
Seat Options
- SS114 SoftClose seat
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- Flush is quiet yet powerful
- Easy to clean design
- Available in several finishes to match your style
- Made in the USA
- The flapper and the handle are prone to breakages due to poor design
- Migh be too small for some users
Summary of Recent Reviews
Overall, customers are satisifed with the effective flush of this toilet. Installing this toilet eliminated clogging issues that various reviewers experienced with their previous toilet. A handful of buyers had to contact customer service and were pleased with the support they received.
9. Kohler Santa Rosa
- Flushing Score:
- Water Consumption: 1.28
- Bowl Shape:
- Flushing System:
- Flush Type: Single
- Dimensions (sourced from manual): Toilet (27.75″ x 18.75″ x 28.19″), (12″), (17.25″)See image with dimensions
Performance Ratings
★ Easy to Install – 3 out of 5
* based on Amazon’s rating system
Seat Options
- K-75796 Cachet® Nightlight Quiet-Close™ Elongated seat
- K-8298 C³®-155 Elongated bidet seat
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- Flushing system conserves water
- Beautiful, modern design
- Easy to maintain
- Installation is straightforward
- Comes only in black
Summary of Recent Reviews
Buyers like this stylish, powerful toilet. The style is sleek and modern which buyers love. While some experienced issues with the toilet shattering during shipping, they were able to quickly receive replacements. "UPDATE: 2 years later. Still GREAT toilet."
10. Kohler Kathryn
- Flushing Score:
- Water Consumption: 1.28
- Bowl Shape:
- Flushing System:
- Flush Type: Single
- Dimensions (sourced from manual): Toilet (28″ x 17.5″ x 28.63″), (12″), (17.37″)See image with dimensions
Seat Options
- K-75796 Cachet® Nightlight Quiet-Close™ Elongated seat
- K-4108 C³®-230 Elongated bidet toilet seat
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- AquaPiston flush technology
- Comfort height is charge level for added comfort
- Saves up to 16,500 gallons of water per year
- Retro and modern design combined
- Some parts are slightly weak
Summary of Recent Reviews
This toilet gets high reviews from its buyers. Many were pleased with the modern design of the toilet, making it a great addition to their bathrooms. Installation was easy, and it has an effective flush, even with its minimal water usage.
11. SaniCanada 942
- Water Consumption: 0.8/1.28
- Bowl Shape:
- Flush Type:
- Style: One-Piece
- Dimensions (sourced from manual): Toilet (27.5″ x 14.37″ x 30.31″), (12″), (16″)See image with dimensions
To start, it comes with a dual-flush system for either a 0.8 or 1.28-gallon flush, which saves lots of water annually.
The toilet requires almost no maintenance and can be cleaned in a matter of minutes.
Also, the unit comes with a 5-year warranty. In case of any malfunction, you can call their polite and professional team to help you out.
Seat Options
- SaniCanada #UFKJ201 Elongated toilet seat
Product Documentation
Customer Reviews
Last gathered: April 17, 2022
- Made with high-quality materials
- Sleek and modern design
- Amazing customer support
- Too complex for average DIY installation
Choosing a One-Piece Toilet
Choosing the right one-piece toilet is not always simple. There are various things to consider, which might be difficult if you are buying a one-piece toilet for the first time.
Here we've listed four important details to keep in mind when buying a new one-piece toilet:
Dimensions and Rough-in Requirement
Most toilets will be 12 inches from the wall, which is called a rough-in dimension. However, be sure to measure your bathroom's rough-in before buying a toilet, in case you need a 10 or 14 inch option instead. It's also important to keep an ideal seat height in mind to ensure you new toilet will fit every member of the family.
Water Efficiency
Water efficiency has two advantages: it saves you money while also saving the environment. But does using less water affect the flush power? Basically, most modern toilets consume 1.28 gallons of water per flush while maintaining plenty of power. Some toilets might use up to 1.6 gallons, but more than that is not water-efficient.
It’s a common belief that the more water the toilet uses, the cleaner it will be. However, high water consumption flushing leads to huge waste over time. Toilets usually account for 30 percent of water usage in an average household. To combat any water waste, modern toilets use much less water while maintaining efficiency. Look for a model with an EPA WaterSense label to ensure you purchase an efficient option.
Easy Cleaning
The obvious advantage of single-piece models is the ease of cleaning. Since the bowl and the tank are connected, there is no place for bacteria to form. You will especially notice the difference if you’ve ever tried to clean a two-piece toilet. Additionally, the chance of leaking is minimal, since the bowl and the tank are one piece. Looking for a model with a simple and sleek design will increase the ease of cleaning.
Take a look at our homemade toilet cleaning guide
Highly Durable
Any type of equipment, including toilets, is more durable with fewer parts. A two-piece toilet has a rubber gasket which can cause leaking over time. By looking for a simple one-piece option with minimal surplus parts, you'll lower your risk of broken parts over time. Pay attention to user reviews and warranty options as well to ensure you invest in a durable, high quality toilet.
Advantages of One-Piece Toilets
Basically, two-piece toilets have the same features as their one-piece counterparts and often cost much less. So, why are one-piece units so popular? And what are the advantages of those toilets?
-
Easier to Clean
To start, with no crevices or joints, there is no place for dirt to build up on a one-piece toilet, which is a big upside. They are also much easier to maintain because they have a lower chance of breaking or leaking in particular
-
Seamless Design with Fewer Separate Parts
One-piece models are often smaller, making them ideal for compact bathrooms. Plus, they have a sleeker design that fits well with modern bathrooms. Finally, single-piece toilets come as a whole unit, which prevents possible problems with shipping.
-
No Drill Holes to Support Water Tank
To install a standard two-piece toilet, you would have to drill holes to support the water tank. You won’t have that problem with single-piece models, making their installation process a lot simpler.
Few Disadvantages
Of course, one-piece models have some disadvantages, too. First, they are quite expensive, and if you buy a cheaper model, it can be a risk, since they may be made of low-quality materials.
Also, if the toilet bowl breaks, you cannot replace it without buying a completely new toilet, as all the parts are within one piece.
Further, many one-piece toilets are usually smaller and lower height, which is not ideal for tall persons. However, if you buy a wall-mount toilet, you can place it a few inches higher to increase comfort.
In the end, the main downside to one-piece units is their weight. Because you can't separate any part of the toilet, the full unit is usually quite heavy, which might be a problem during installation. We strongly advise you to call a professional to install your one-piece toilet, or at least have multiple people to help. As some one-piece models can be up to 90 pounds or heavier, installing one alone is almost impossible.
Installation Process
Installing a one-piece toilet is actually very simple, but the process can vary depending on the specific toilet.
To install your new toilet, start by turning off the water supply and getting rid of the old toilet. Remove the old toilet carefully and clean any spills or excess from the floor. Then, remove the old wax ring to make sure that the new toilet won’t leak. To completely remove the leftover wax, you should use a scraping tool.
Next, ensure that there are bolt holes in the new toilet. If there are none, you will have to drill holes on the floor. But first, remove any excess material so that it doesn’t reach the wax ring.
When you are done, it’s time to install the new wax ring. Stick the wax ring to the toilet to make sure it’s centered properly. If needed, simply rotate the ring until everything is aligned.
To lay down a new toilet, ideally, have someone else there to help. Once the bolts properly line up with the holes on the floor, bolt the toilet down. You can complete this step with nuts and washers which are usually included in the package.
Then, install the toilet flush, and finally, the toilet seat. Seats usually have plastic screws, so you simply need to put them in place and tighten them. After you’ve done the final step, turn the water back on and you are finished. Your toilet is ready for use.
Frequently Asked Questions
Obviously, the best one-piece toilet should be affordable and trustworthy while offering many of the features discussed in this article. Among the many brands that we tested, TOTO seems to be the market leader with toilets that are efficient and comfortable.
If you have some basic DIY skills, installing a one-piece toilet shouldn’t be a problem. However, you should still call a professional to prevent voiding your warranty.
Yes. Especially if you select a one-piece toilet with a strong flushing system, they're often able to clear all waste with every flush. Even with water efficient toilets, their flushing mechanisms allow one-piece models to be completely clean, with less water involved.