The best one piece toilet bowl gives you a seamless, easy-to-clean design that looks great in any bathroom. Because a one-piece toilet bowl has no seam between the tank and bowl, there are fewer places for grime to hide.
We compared four models. Our quick verdict: the Casta Diva 17.2-inch is the best for accessibility, the HOROW T0338W is the best compact pick, and the DeerValley Compact is the best for tiny bathrooms.
Best One Piece Toilet Bowl: Top Picks Compared
Our top picks for one piece toilet bowls are the HOROW T0338W One Piece Toilet ADA Chair, the Casta Diva Elongated One Piece Toilet, and the DeerValley Compact One Piece Toilet.
Pros
- Seamless one-piece design is easy to wipe down and looks modern.
- ADA chair height makes sitting and standing easier for all users.
- Strong siphon flush and dual flush option save water without sacrificing performance.
- Soft-close seat reduces noise and adds convenience.
- Includes all necessary installation hardware, simplifying setup.
Cons
- Installation can be challenging due to heavy weight and limited access to tightening bolts.
- Side access holes for mounting bolts are small, making wrench work difficult.
- Compact tank may require careful alignment with existing plumbing.
The HOROW T0338W is a compact one-piece toilet designed for small bathrooms and users seeking ADA-compliant comfort. Its 17.3 inch seat height makes it easier for seniors and those with mobility challenges to sit and stand.
Standout features include a dual flush system (1.1/1.6 GPF) paired with a fully glazed 2 inch trapway and siphon flushing. This combination delivers powerful waste removal while saving water, and the soft-close seat adds a touch of quiet convenience.
Built from durable ceramic with a sleek, skirted design, the toilet measures 26.6 inches deep by 15 inches wide by 26 inches high. The seamless exterior is easy to clean, though the unit weighs nearly 100 pounds, requiring careful handling during installation.
Some users report that the side access holes for mounting bolts are small, making tightening difficult. The weight also makes centering on the flange tricky, but the included hardware and clear instructions help offset these challenges.
Overall, the HOROW T0338W offers excellent value for its price. It combines space-saving dimensions, accessibility features, and reliable performance, making it a top choice for small bathrooms and users who prioritize comfort and ease of cleaning.
Brand: HOROW
Model: T0338W
Dimensions: 26.6" D x 15" W x 26" H
Weight: 99.2 pounds
Material: Ceramic
Seat Material: Plastic (soft-close)
Flush Type: Siphon, dual flush (1.1/1.6 GPF)
Rough-In: 10 inches or 12 inches (selectable)
Warranty: 1 year limited
Pros
- Powerful flush without needing electricity, ideal for renovations or backup use
- Hygienic hands-free operation with foot kick and side button options
- Comfort height seat (17.2 inches) reduces strain for elderly or tall users
- Quiet-close seat prevents slamming and adds convenience
- Easy to install with all necessary hardware included
Cons
- Requires a 12 inch rough-in, which may not fit all existing bathroom setups
- Air-pressure assisted flush can be louder than traditional gravity flush toilets
- Only available in white, limiting color options for some decors
The Casta Diva Elongated One Piece Toilet offers a unique blend of hands-free convenience and powerful flushing technology, making it a standout choice for modern bathrooms. Designed for those who prioritize hygiene and accessibility, this toilet is especially suited for seniors, individuals with mobility issues, or anyone looking to reduce contact with high-touch surfaces.
Its standout feature is the air-pressure assisted flush system, which delivers a robust 1.0 GPF flush without relying on electricity. This system works effectively even in low water pressure environments, ensuring consistent performance. The foot kick and side button flush options allow you to flush without touching a handle, a significant advantage for cleanliness and ease of use.
The toilet boasts a sleek, skirted design with a quiet-close seat and a 17.2 inch ADA compliant comfort height. The elongated bowl provides extra room, and the vitreous china construction resists stains and scratches. Installation is straightforward thanks to the standard 12 inch rough-in and included mounting kit.
Potential drawbacks include the need for a specific rough-in size (12 inches), which may not match all existing plumbing. The air-pressure flush can be noisier than a gravity model, though many users find the trade-off acceptable for the performance. Additionally, the toilet is only available in white.
Overall, the Casta Diva one-piece toilet delivers on its promises of hygiene, accessibility, and water efficiency. It is a solid investment for anyone seeking a reliable, low-maintenance toilet that caters to comfort and modern convenience.
Pros
- Sleek, modern one-piece design with easy-to-clean skirted profile
- Comfortable 17-inch ADA chair height for easier use
- Powerful 1000-gram MAP flush that is quiet and efficient
- Dual flush saves water without compromising performance
- Soft-close seat adds convenience and reduces noise
Cons
- Some users report occasional clogging, particularly with paper, requiring extra water to flush
- Installation may be trickier than traditional two-piece toilets due to the compact one-piece design
- Compact dimensions may not suit larger bathrooms or users who prefer a more spacious bowl
The Casta Diva Elongated One Piece Toilet (model CD-T005) is a modern, skirted toilet designed for homeowners who value both style and efficiency. With its 17-inch ADA comfort chair height, it is an excellent choice for adults, seniors, and anyone seeking easier access and a more natural sitting position. The dual flush system offers water savings without sacrificing power, making it a practical upgrade for any bathroom.
At the heart of this toilet is a powerful siphon jet flush with a MAP rating of 1000 grams. Real-world user reviews highlight that it clears waste effectively and operates quietly, with many appreciating the noise reduction during nighttime use. The dual flush buttons allow you to select 1.1 GPF for liquid waste or 1.6 GPF for solids, earning it EPA WaterSense certification. However, a notable minority of users have experienced clogging issues, particularly with toilet paper, which can require adding extra water to initiate a proper flush.
The one-piece, skirted design is a standout feature: it eliminates the gap between the tank and bowl, creating a seamless profile that is much easier to clean than traditional two-piece toilets. The soft-close seat with quick-release functionality adds everyday convenience and allows for easy removal during cleaning. The compact dimensions (27.17" D x 14.37" W x 25.39" H) help it fit well in smaller bathrooms, though some may find the bowl a bit shorter than standard elongated models.
Build quality is solid, with a glossy ceramic finish that resists staining and scratches. The toilet meets CUPC standards and comes with a one-year limited warranty and lifetime technical support. Installation is designed for a standard 12-inch rough-in and includes all necessary hardware, but some DIYers report that the one-piece design is slightly heavier and more awkward to maneuver than a two-piece unit, so having an extra pair of hands is recommended.
Overall, the Casta Diva Elongated One Piece Toilet offers an excellent balance of modern aesthetics, water efficiency, and comfort at a competitive price. While minor clogging concerns exist, the vast majority of reviews praise its performance, ease of cleaning, and quiet operation. It is a strong choice for anyone looking to upgrade their bathroom with a stylish, high-functioning toilet.
Pros
- Compact size ideal for small bathrooms and guest toilets
- Water-saving dual flush with powerful performance
- Skirted design simplifies cleaning significantly
- Soft-close seat included for quiet, comfortable use
- Standard height round bowl fits most users comfortably
Cons
- Round bowl offers less legroom than elongated models
- Heavy at 78 pounds, so installation may require two people
- Fixed 12-inch rough-in may not suit all existing plumbing configurations
The DeerValley Compact One Piece Toilet is a space-saving solution for small bathrooms, half baths, and guest powder rooms. Its round bowl and standard seat height provide a comfortable, ergonomic sitting position while keeping the footprint tight at just under 25 inches deep and 13 inches wide.
Performance is a strong point. The dual flush system offers a 1.1 GPF liquid flush and a 1.6 GPF solid flush, using up to 60 percent less water than older 3.5 GPF models. That can save roughly 16,500 gallons per year, yet the flushing action remains powerful and quiet, making it a smart choice for water-conscious households.
The fully skirted ceramic body is a standout design feature. It eliminates the usual nooks and crevices around the base and trapway, so cleaning is simply a quick wipe. The included soft-close PP seat adds a touch of comfort and operates at just 28dB, preventing noisy slams on late-night trips.
One thing to consider is that the round bowl provides less surface area than an elongated model, and the toilet is fairly heavy at 78 pounds, so installation may require two people. Also, it is designed for a standard 12-inch rough-in, so be sure to measure your existing plumbing before ordering.
Overall, the DeerValley compact one-piece toilet delivers a strong combination of water efficiency, easy maintenance, and space-saving design for the price. With a complete installation kit and a one-year warranty, it is a solid upgrade for smaller bathrooms that still need full-size comfort.
Our Best One Piece Toilet Bowl Picks Reviewed
Among the one piece toilet bowls we reviewed, the Casta Diva Elongated (17.2 Inches) stands out, and every pick is judged on performance, features, and value.
- Casta Diva Elongated (17.2 Inches): It has a powerful air-pressure assisted flush, hands-free foot-kick activation, and an ADA-compliant comfort height.
- Casta Diva Elongated (17 Inches): A sleek, modern design with a comfortable seat height.
- HOROW T0338W: A compact design with a 17.3-inch ADA seat height and a dual flush.
- DeerValley Compact: A space-saving design for small bathrooms.
One Piece Toilet Bowl: Comfort Height Explained
Comfort or chair-height toilets measure about 17 to 19 inches from the floor to the top of the seat. They are easier to sit on and stand up from, which helps taller people, seniors, and anyone with knee pain.
How to Choose a One-Piece Toilet Bowl
Choosing the right one piece toilet bowl comes down to measuring the rough-in, picking a bowl shape, choosing the height, and comparing flush systems.
- Measure the Rough-In: Most homes use a 12-inch rough-in.
- Pick a Bowl Shape: Elongated bowls are more comfortable, while compact designs save space.
- Choose the Height: Comfort height suits most adults.
- Compare Flush Systems: Air-assisted and dual-flush systems clear waste well.
- Look for Special Features: Hands-free flushing adds hygiene.
For more options, read our guides to the best comfort height toilet and the best toilet for elderly users.
Comparing the Picks
The HOROW T0338W is a compact one-piece toilet with ADA seat height. The Casta Diva 17.2-inch model adds an air-pressure-assisted flush for strong performance. The Casta Diva 17-inch model offers a sleek modern look with a comfortable height.
Measuring Rough-In
Rough-in is the distance from the finished wall to the center of the floor drain flange. Most homes use 12 inches, but some use 10 or 14 inches. Measure before buying, since the toilet must match.
Bowl Shape and Height
Elongated bowls are often more comfortable, while round bowls save space in small bathrooms. Comfort-height or ADA-height bowls sit around 17 to 19 inches, which many adults and older users find easier.
Flush Performance and Water Use
Many modern toilets use 1.28 gallons per flush or less, and dual-flush models offer a lighter flush for liquids. Look for reviews about clog resistance.
Installation Basics
Use a new wax ring or wax-free seal, tighten floor bolts evenly to avoid cracking the base, and check for leaks after the first few flushes. Hire a plumber if you are unsure.
Cleaning Made Easier
Skirted designs hide the trapway and leave smooth sides that are easier to wipe. Glazed trapways help waste move through more cleanly.
Common Mistakes to Avoid
Do not skip measuring rough-in. Avoid ignoring seat height, and compare flush systems before buying a one piece toilet bowl.
Choosing Between One-Piece and Two-Piece
One-piece toilets have the tank and bowl molded together, which leaves fewer seams to clean and often looks sleeker. Two-piece toilets are usually less expensive and easier to carry, since the tank and bowl ship separately.
Seat Included?
Some toilets include a seat and others do not. Check the listing, and budget for a slow-close seat if needed.
Water Pressure and Flushing
Gravity-fed toilets work well in most homes. Pressure-assisted models use stored air for a powerful flush but can be louder.
Delivery and Handling
One-piece toilets are heavy and awkward. Plan for two people to carry and set the toilet, and inspect it for cracks before installing.
Final Verdict on the Best One Piece Toilet Bowl
The best one piece toilet bowl for accessibility is the Casta Diva 17.2-inch. Choose the HOROW for a compact dual-flush model or the DeerValley for very small spaces.
One Piece Toilet Bowl FAQs
Common questions from buyers include “Is a one-piece toilet bowl easier to clean?”, “What is foot-kick flushing?”, and “Do I need a plumber?”.
Is a one-piece toilet bowl easier to clean?
Yes. There is no tank-to-bowl seam.
What is foot-kick flushing?
It lets you flush with your foot for hands-free hygiene.
Do I need a plumber?
Many people hire one, because these toilets are heavy.
For more bathroom essentials, browse our best toilets category.
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