There are numerous one-piece toilet models, and finding the best one-piece toilet for your household may seem like an overwhelming task. Finding the perfect one for your bathroom involves locating one that is stylish, fits your decor, is suitable for your budget, and fits the space. Keeping all these things in mind when buying a toilet can be exhausting!
Table of Contents
In this guide, we’ll explore the benefits of one-piece toilets, key features to consider, and review some of the best models available today.
Why Choose a One-Piece Toilet?
One-piece toilets differ from traditional two-piece models by integrating the tank and bowl into a single, seamless unit. This design offers several advantages:
- Easy Cleaning: Fewer crevices and joints mean less room for grime to build up.
- Modern Aesthetic: One-piece toilets typically have a more streamlined, contemporary look.
- Durability: The integrated design reduces the risk of leaks between the tank and bowl.
- Simple Installation: With fewer parts, installation is often quicker and more straightforward.
Things to Consider When Choosing a One-Piece Toilet
With hundreds of toilets flooding the market, make sure that you purchase one that is ideal for all family members. Since toilets are one of the most important features in a bathroom, it not only needs to be functional, but also aesthetically pleasing while complementing the style of your bathroom.
Dimension and Size
What makes one-piece toilets beneficial is they are smaller than traditional ones. This makes them perfect for smaller bathrooms or powder rooms, and they allow for more floor space. Check the toilet’s dimensions prior to purchasing and pay attention to the distance it protrudes from your wall.
Toilet Shape
Shape is equally important. Toilets come in round and elongated sizes. Traditional ones are round, while elongated toilets extend further forward and provide greater comfort. Comfort is additionally important in a toilet, as some of us may spend quite a bit of time in the bathroom. There are square and rectangular designs available for purchase.
Flush System
One-piece toilets come with either dual flush or standard flush. Standard flush does not have a variation in the amount of water per flush. Every time the lever is pressed, it provides the same amount of water. This full flush is not as effective at saving water.
Dual flush systems incorporate a partial and standard flush. Partial flushes remove liquids, while full flushes are for everything else. Partial flushes are also quieter than full flushes. Measured in gallons per flush (gpf), partial flushes use 0.8-1.2 gallons per flush. Meanwhile, a full flush uses 1.5 gpf.
Seat Height
Whenever possible, examine the height of your toilet seat. Generally, 16.5” is the standard height. For people who are smaller in stature, toilets that are 16” may be more comfortable. However, if you have anyone in your household with mobility challenges, this may not be a good choice as they may struggle to get up and down.
Seats should be 16.5” from the floor to be ADA compliant.
Is the Seat Included?
Not all seats are included with a toilet. Some one-piece toilets may contain unusual dimensions. Purchasing a replacement seat or a new one may cost more and be more time-consuming to locate due to an odd size. Lids that offer a soft close are wonderful if you don’t want to hear dropped lids, or if children are sleeping.
Top 3 One-Piece Toilet Models on the Market
When looking for the best one-piece toilets, we considered ones that eliminate waste effectively, come in a variety of styles, clean well, and have a variety of features. Look for one that is perfect for your budget, fits your space, and is durable.
1. Kohler Santa Rosa
The Kohler Santa Rosa One-Piece Toilet is a perfect blend of performance, comfort, and sleek design, making it one of the top choices for anyone looking to upgrade their bathroom with a modern and efficient toilet.
Design & Comfort
This model features a one-piece construction, integrating the tank and bowl into a seamless unit that not only looks great but is also easier to clean than traditional two-piece toilets. The compact elongated bowl delivers the comfort of an elongated shape while fitting into the space of a round-front toilet—ideal for smaller bathrooms.
Comfort Height & Usability
The Comfort Height feature offers chair-height seating, making sitting and standing more comfortable for most adults. The left-hand polished chrome trip lever is positioned for easy flushing access.
Performance & Flushing Technology
With 1.28 gallons per flush (gpf), this model meets WaterSense standards, offering water efficiency without sacrificing performance. Its standout feature, Revolution 360 swirl flushing technology, delivers a powerful, swirling motion that helps keep the bowl cleaner for longer. Combined with the CleanCoat surface treatment, which inhibits mineral buildup and stains, maintenance becomes less of a hassle.
Other Features
- 2-1/8″ fully glazed trapway helps ensure effective waste removal and reduces clogs.
- Durable build and stylish appearance fit well with a wide range of bathroom decors.
Verdict
If you’re looking for a compact, stylish, and efficient toilet that doesn’t compromise on comfort or flushing power, the Kohler Santa Rosa is an excellent choice. Its modern features and user-friendly design make it one of the best one-piece toilets on the market today.
2. WoodBridge One-Piece Toilet
The Woodbridge One-Piece Toilet blends elegant modern design with top performance, making it a standout choice in today’s market for high-efficiency, user-friendly toilets.
Comfort & Accessibility
Designed with Chair Height seating, this model adheres to ADA standards with a 17–19″ floor-to-rim height (with seat), offering greater comfort for taller users and those with mobility challenges. It’s ideal for older adults or anyone who finds lower toilet seats difficult to use.
Modern Aesthetic & Easy Cleaning
This toilet features a sleek, luxurious one-piece design with a fully concealed trapway, eliminating the nooks and crannies where dust and dirt can accumulate. The smooth exterior makes cleaning effortless, and the absence of visible mounting holes or plastic caps gives it a clean, premium look.
Flushing Power & Efficiency
Equipped with a powerful siphon flushing system and a fully glazed trapway, this toilet delivers a quiet yet forceful flush, minimizing the chance of clogs or leaks. With a MaP flush score of 1000 grams, it stands among the best in flushing performance. The 1.28 GPF dual flush system ensures water savings without compromising effectiveness.
Premium Features & Build
- Soft-closing seat with durable stainless steel hinges ensures longevity and noise-free use.
- Easy removal of the seat for deep cleaning or tightening.
- The chrome flush button adds a stylish touch to the overall design.
Complete Installation Package
Woodbridge includes everything you need:
- Pre-installed soft-close seat
- Water fitting
- Wax ring
- Floor bolts
- Installation instructions
- Special hand wrench for tightening bolts in tight spaces
Certified & Approved
This toilet is WaterSense Certified, UPC & CSA compliant, and approved by the Massachusetts Plumbing & Gas Code, ensuring it meets high standards for performance and efficiency.
Verdict
The Woodbridge One-Piece Toilet is a perfect choice for those seeking modern design, easy maintenance, and powerful performance. With its high flushing score, ADA-compliant comfort height, and quiet operation, it’s easily one of the best one-piece toilets available for residential use.
3. American Standard Champion 4
The American Standard Champion 4 lives up to its name, delivering unbeatable performance, clog-free reliability, and user-friendly comfort in a sleek one-piece design. It’s one of the top contenders for anyone seeking a powerful and low-maintenance toilet.
Clog-Free Performance
This model features an extra-large 4-inch flush valve paired with a 2-3/8-inch fully glazed trapway, ensuring one of the most powerful, virtually clog-free flushing systems on the market. It handles bulk waste efficiently and with fewer flushes, thanks to its 1.6 gallons per flush (GPF) water usage.
Hygienic & Easy to Clean
The one-piece construction eliminates seams where grime and bacteria typically build up, making cleaning a breeze. It also includes American Standard’s EverClean® surface, which helps inhibit the growth of stains, bacteria, and odors, keeping the toilet fresher for longer between cleanings.
Comfort & Accessibility
With a Chair-Height bowl at 16.5 inches, this toilet meets ADA requirements, making it easier and more comfortable for users of all ages and mobility levels to sit and stand. The elongated bowl adds extra room and ergonomic support.
Convenience Features
- Comes with a slow-close seat, preventing slams and ensuring quiet operation.
- Chrome trip lever and bolt caps are included, rounding out the package with functional and stylish touches.
- Built to last, the toilet’s durable construction offers long-term reliability and support.
Verdict
If you’re looking for a high-performance one-piece toilet that blends powerful flushing, easy cleaning, and exceptional comfort, the American Standard Champion 4 is a winning choice. Its clog-resistant design and EverClean surface make it perfect for busy households that value convenience and cleanliness.
Comparison Table: Top 3 One-Piece Toilet Models
Here’s a comparison table of the Top 3 Best One-Piece Toilet Models based on design, performance, comfort, and features:
Feature/Model | Kohler Santa Rosa | Woodbridge One-Piece Toilet | American Standard Champion 4 |
|---|---|---|---|
Flushing System | Revolution 360® swirl flush | Siphon flush (MaP 1000g) | Champion 4® with 4″ flush valve |
GPF (Gallons Per Flush) | 1.28 GPF | 1.28 GPF Dual Flush | 1.6 GPF |
Design | Compact, elongated bowl | Sleek, modern one-piece | Smooth one-piece, elongated |
Comfort Height | Yes | Yes (ADA-compliant 17–19″) | Yes (16.5” chair height) |
Seat Included | Yes (Comfort Height seat) | Yes (Soft-closing seat) | Yes (Slow-close seat) |
Cleaning Features | CleanCoat surface, easy to wipe | Fully concealed trapway | EverClean® antimicrobial surface |
Certifications | WaterSense | WaterSense, UPC, CSA | WaterSense, ADA |
Special Features | Space-saving compact design | All-in-one installation kit | Industry-leading clog-free design |
Best For | Small bathrooms, modern homes | Style + flushing power | Heavy-duty households, reliability |
Pros and Cons of One-Piece Toilet Models
Pros of One-Piece Toilet Models
- Sleek, Modern Design
- Offers a smooth, seamless look that works well in contemporary bathrooms.
- Easier to Clean
- With no gap between the tank and bowl, there are fewer places for grime and bacteria to hide.
- Fewer Leaks
- The integrated design reduces the risk of leaks between the tank and bowl, which can occur in two-piece models.
- Space-Saving
- Many one-piece toilets are more compact, making them ideal for small bathrooms or tight spaces.
- Durability
- Fewer parts and a solid construction often mean better long-term durability.
- Quick Installation
- Often easier to install because you’re dealing with a single unit (though it may be heavier).
Cons of One-Piece Toilet Models
- Higher Cost
- Typically more expensive than two-piece toilets due to the manufacturing process and design.
- Heavier and Bulkier
- The one-piece construction makes it heavier and harder to handle during installation.
- Less Customization
- Limited flexibility in replacing parts like the tank or bowl separately since they’re fused together.
- Can Be Harder to Find
- Fewer style and model options compared to two-piece toilets.
- Shipping/Handling Risks
- Since it’s one solid unit, it’s more prone to damage during transport if not handled carefully.
One-Piece Toilet Installation Tips
Here are some One-Piece Toilet Installation Tips to ensure a smooth and successful setup:
Preparation Tips
- Measure Carefully
- Check the rough-in distance (the space between the wall and the center of the floor drain). Most toilets are 12 inches, but some are 10 or 14 inches.
- Check All Parts
- Make sure the box includes the wax ring, bolts, toilet seat, and installation hardware. Some models even come with a hand wrench for tight spots.
- Turn Off the Water Supply
- Shut off the water valve and flush the old toilet to empty the tank. Use a sponge or towel to remove remaining water.
- Inspect the Floor Flange
- Ensure your floor flange is level, clean, and in good condition. Replace it if damaged.
Installation Tips
- Use a New Wax Ring
- Always install a fresh wax ring for a proper seal. Some prefer wax-free rings for easier cleanup and repositioning.
- Have Help for Lifting
- One-piece toilets are heavier than two-piece models. Have a second person assist in lifting and placing the unit.
- Lower Straight Down
- Line up the bolts with the holes and lower the toilet vertically onto the flange without rocking, to avoid smearing or damaging the wax ring.
- Tighten Bolts Evenly
- Secure the toilet to the floor using the bolts, but do not overtighten — this can crack the porcelain.
- Check for Leveling
- Use a level to ensure the toilet sits flat. Shim if necessary before final tightening.
Post-Installation Tips
- Connect Water Supply Line
- Reconnect the supply line and tighten by hand, then give a slight turn with a wrench if needed.
- Test for Leaks
- Turn on the water, let the tank fill, and check around the base and supply line for leaks.
- Seal the Base
- Apply a bead of caulk around the base for a clean finish and to prevent water seepage under the toilet.
- Install the Seat
- If not pre-installed, attach the toilet seat using the provided hardware.
How do you measure rough-in for a one-piece toilet?
To measure the rough-in for a one-piece toilet, follow these simple steps:
Tools You’ll Need:
- Tape measure
- Pencil (optional)
Step-by-Step Guide:
- Locate the Drain Pipe Bolts
- Find the two closet bolts that hold the toilet to the floor. These are located on either side of the base.
- Measure From the Wall to the Center of the Closet Bolts
- Measure from the finished wall (not the baseboard) to the center of the closet bolts.This distance is your rough-in.
- 12 inches (most common)
- 10 inches (space-saving models)
- 14 inches (for older homes or more legroom)
- Double-Check the Space
- Ensure there’s enough clearance for the tank (even with a one-piece model) and any required building code spacing (usually 15″ from the center of the toilet to any side wall or fixture).
Pro Tip:
If the toilet is already removed, you can measure from the wall directly to the center of the drain opening (closet flange).
Frequently Asked Questions
What is a one-piece toilet, and how is it different from a two-piece toilet?
A one-piece toilet integrates the tank and bowl into a single, seamless unit. This design offers a sleeker appearance, is easier to clean, and has fewer crevices where dirt can collect. In contrast, a two-piece toilet has a separate tank and bowl, which may be slightly easier to transport but can be harder to clean and more prone to leaks between components.
Are one-piece toilets more expensive than two-piece models?
Yes, one-piece toilets are typically more expensive due to their manufacturing process and sleek, space-saving design. However, the added benefits like easier maintenance, modern aesthetics, and durability often justify the higher cost for many homeowners.
Is installation more difficult for a one-piece toilet?
Not necessarily. While one-piece toilets are heavier and may require two people for installation, the process itself is generally the same as installing a two-piece toilet. Most come with installation kits and detailed instructions, and many homeowners can handle the job with basic tools.
Do one-piece toilets save space in small bathrooms?
Absolutely. One-piece toilets often feature compact designs with lower profiles and shorter depths, making them an excellent choice for small bathrooms or powder rooms where every inch counts.
Are one-piece toilets more efficient in water usage?
Most modern one-piece toilets are designed with high-efficiency flushing systems, using as little as 1.28 gallons per flush (GPF). Many are WaterSense certified, meaning they use at least 20% less water than standard models without sacrificing performance.
Conclusion
Choosing the best one-piece toilet depends on your bathroom layout, design preferences, and performance needs. Whether you prioritize water efficiency, modern aesthetics, or a powerful flush, there is a model to suit every need and budget.
Investing in a high-quality one-piece toilet can elevate both the functionality and style of your bathroom for years to come.