Casta Diva Elongated One Piece Toilet with 17.2" ADA Comfort Height Seat
4.5Editor score
Air-Pressure Assisted Flush
Hands-Free kick flush
17.2 inch height
CUPC certified quality
9 Best One Piece Toilets (November 2026) Expert Guide
Finding the right bathroom fixture can transform your daily routine and home value. One piece toilets offer a sleek, modern look that simplifies cleaning and reduces potential leak points. These models integrate the tank and bowl into a single unit, providing durability and style for any bathroom space.
We compared nine top-rated one piece toilets based on user feedback, flushing power, and design features. Our analysis highlights models that excel in water efficiency, comfort height, and ease of installation. Each product was evaluated for real-world performance and long-term reliability to help you make an informed choice.
This guide presents detailed reviews and comparisons to streamline your decision process. Every pick includes key specifications, pros, and cons to highlight what matters most. Note that prices and availability may change, so checking current listings is recommended before finalizing your purchase.
Top 3 Picks for Best One Piece Toilets
DeerValley Elongated One-Piece Toilet with ADA Chair Height Seat, DV-1F0437
4.7Editor score
1000g MaP score
ADA Height comfort
Soft-Close seat
Premium durable ceramic
DeerValley Compact One Piece Toilet Standard Seat Height for Small Bathroom
4.3Editor score
Space-saving compact design
Dual Flush 1.1/1.6
Fully skirted base
Includes installation kit
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Top 9 Best One Piece Toilets in 2026 Compared
This side-by-side comparison highlights key specifications across all nine models to help you visualize differences in design, efficiency, and features.
ProductsSpecificationsEditor scorePrice
Best Budget
DeerValley Compact One Piece Toilet
1.1/1.6 GPF Dual Flush
12 inch Rough-in
24.5 x 13.25 x 28.25 inch
4.3 Rating
4.3Editor score
Editor's Choice
Casta Diva Elongated One Piece Toilet
17 inch Comfort Height
MAP 1000g Flush
27.17 x 14.37 x 25.39 inch
4.4 Rating
4.4Editor score
Best Premium
Casta Diva Elongated with 17.2 ADA Height
Air-Pressure Assisted Flush
1.0 GPF Water Saving
26.9 x 15 x 19.3 inch
4.5 Rating
4.5Editor score
DeerValley Elongated One-Piece Toilet
ADA Chair Height Seat
Dual-Flush 1 or 1.28 GPF
26.77 x 14.5 x 26.6 inch
4.7 Rating
4.7Editor score
One Piece Sleek Modern Toilet
0.9/1.28 GPF Dual Flush
25.5 x 14.7 x 27 inch
Side Water Outlet
4.6 Rating
4.6Editor score
Casta Diva One Piece Toilet Gold
17.5 inch Comfort Height
Gold Button Detail
25.39 x 14.56 x 26.57 inch
4.4 Rating
4.4Editor score
St. Tropez Comfort Height One-Piece Toilet
Vortex Dual-Flush 1.1/1.6 GPF
White Hardware Finish
Standard Elongated Bowl
4.3 Rating
4.3Editor score
DeerValley Compact One Piece Toilet Modern
1.1/1.6 GPF Dual Flush
Compact 24.5 inch Length
Quiet 28dB Operation
4.3 Rating
4.3Editor score
CANEST GF-002 Compact One Piece Toilet
23.5 inch Depth
Dual-Flush 1.1/1.6 GPF
Integrated Tank Design
5.0 Rating
5.0Editor score
1. DeerValley Elongated One-Piece Toilet – Best Overall One Piece Toilet
DeerValley Elongated One-Piece Toilet
1000g MaP Score
17.5 inch ADA Height
Dual-Flush 1 or 1.28 GPF
Premium Glaze Finish
This DeerValley model stands out with a high 4.7 rating, reflecting strong user satisfaction. Its seamless one-piece build and rimless bowl offer a clean aesthetic that fits modern bathrooms well.
Pros
- High MaP flushing score
- ADA compliant comfort height
- Soft-Close quick-release seat
- Premium non-yellowing ceramic
- Easy installation kit
Cons
- Standard design may lack novelty
- Price higher than compact options
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The 1000g MaP score indicates powerful waste clearance, reducing clog risks significantly. The dual-flush system balances water savings with performance, offering 1 GPF for liquids and 1.28 GPF for solids.
While the price is slightly higher than basic models, the durable construction and comfort height justify the investment. Some users might find the design less unique compared to premium luxury brands.
Ideal for homeowners seeking reliability and ergonomic comfort without compromising on style. This model delivers consistent performance and easy maintenance for daily bathroom use.
Powerful Flushing Performance
The 1000g MaP score ensures efficient waste removal with minimal effort per flush.
Ergonomic Comfort Design
ADA-compliant seat height reduces strain and enhances accessibility for all users.
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2. Casta Diva Elongated with 17.2 ADA Height – Best Premium One Piece Toilet
Casta Diva Elongated with 17.2 ADA Height
Air-Pressure Assisted Flush
1.0 GPF Efficiency
Hands-Free Foot Kick
CUPC Certified Quality
Casta Diva offers a premium touch with its air-pressure assisted flush, ensuring powerful performance even in low-pressure environments. This model combines innovation with accessibility for a superior bathroom experience.
Pros
- Air-pressure assisted flushing
- Hands-free foot-kick option
- Water-saving 1.0 GPF
- ADA compliant 17.2 height
- CUPC certification
Cons
- Foot kick mechanism may require adjustment
- Air-pressure system complex
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The hands-free foot-kick feature promotes hygiene by eliminating the need to touch the flush button. Its 1.0 GPF rating meets strict water conservation standards without sacrificing flushing power.
Some users may need time to adjust to the air-pressure mechanism or foot-kick operation. These features add complexity but deliver significant benefits for hygiene and water savings.
Perfect for those seeking high-end features and advanced functionality in a one-piece design. This model brings modern technology to everyday bathroom convenience.
Hygienic Hands-Free Operation
Foot-kick or side-button flush options reduce contact points and improve bathroom hygiene.
Advanced Water Efficiency
Air-pressure assisted system delivers strong flushes while using only 1.0 gallons per flush.
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3. DeerValley Compact One Piece Toilet – Best Budget One Piece Toilet
DeerValley Compact One Piece Toilet
24.5 inch Length
Dual Flush 1.1/1.6 GPF
Fully Skirted Base
Tool-Included Installation
This compact DeerValley model is perfect for small bathrooms, offering a sleek design without unnecessary bulk. Its dual-flush system saves up to 16,500 gallons annually compared to older models.
Pros
- Space-saving compact size
- Fully skirted easy-clean design
- Quiet soft-close seat
- Complete installation kit
- Affordable price point
Cons
- Smaller footprint limits comfort
- Standard height may not suit all
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The fully skirted base simplifies cleaning by eliminating hard-to-reach crevices around the toilet. A soft-close seat operates quietly at just 28dB, ensuring a peaceful environment even at night.
While the compact size may limit comfort for taller users, it excels in space efficiency. Standard height may not meet ADA preferences for those needing extra support.
Best for renters or homeowners with limited space seeking a reliable and efficient toilet. This model balances cost, performance, and design effectively.
Space-Efficient Design
Compact dimensions make installation ideal for small bathrooms or tight floor plans.
Water and Maintenance Efficiency
Dual flush and skirted base reduce water use and simplify cleaning tasks.
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4. Casta Diva Elongated One Piece Toilet – Comfort Focused One Piece Toilet
Casta Diva Elongated One Piece Toilet
17 inch Comfort Height
MAP 1000g Flush
Skirted Easy-Clean
CUPC Certified
This Casta Diva model brings luxury and comfort with a 17-inch seat height ideal for most adults. Its skirted design creates a smooth, modern look that simplifies cleaning around the base.
Pros
- 17 inch comfort height
- MAP 1000g powerful flush
- Skirted seamless design
- CUPC certified safety
- Soft-close seat included
Cons
- Slightly higher price tier
- Installation requires precision
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With a MAP rating of 1000, it ensures powerful siphon jet flush performance to prevent clogs effectively. The dual-flush system aligns with EPA WaterSense criteria for excellent water conservation.
Users may find the price slightly higher than standard models due to premium features. Precision installation ensures optimal performance but might require professional help for best results.
Ideal for those prioritizing comfort and a sleek aesthetic in their bathroom remodel. This model delivers reliable performance and modern design seamlessly.
Comfortable Seat Height
The 17-inch chair height enhances accessibility and reduces strain during use.
Reliable Flushing System
MAP 1000 rating ensures powerful and efficient waste removal with minimal effort.
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5. One Piece Sleek Modern Toilet – Compact Design One Piece Toilet
One Piece Sleek Modern Toilet
25.5 inch Depth
0.9/1.28 GPF Flush
Side Water Outlet
Fully Skirted Base
This sleek model excels with a 0.9 GPF liquid flush that saves water while maintaining powerful performance. Its compact 25.5-inch depth makes it ideal for smaller bathrooms or secondary rooms.
Pros
- Highly efficient dual flush
- Compact sleek design
- Side water outlet benefits
- 1000g MAP score
- ADA compliant 17-inch
Cons
- Round bowl less elongated comfort
- Side outlet requires careful install
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The side water outlet minimizes limescale buildup compared to traditional toilets, keeping the bowl cleaner longer. With a MAP 1000g score, it ensures effective waste removal per flush.
The round bowl design may offer less seating comfort than elongated options. Installation requires attention to the side valve position for proper compatibility.
Best for those seeking water efficiency and modern style in limited spaces. This model delivers high performance without compromising on design.
High Efficiency Water Use
0.9 GPF for liquids significantly reduces water bills without performance loss.
Modern Compact Footprint
Slim 25.5 inch depth fits perfectly in small apartments or studios.
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6. Casta Diva One Piece Toilet Gold – Unique Style One Piece Toilet
Casta Diva One Piece Toilet Gold
17.5 inch Height
Gold Button Detail
25.39 inch Depth
Water Saving 1.0 GPF
This unique model adds a touch of elegance with its golden flush button and seamless skirted design. The 17.5-inch height provides excellent ergonomic support for most users.
Pros
- Luxurious gold button
- 17.5 inch comfort height
- MAP 1000g flush
- Compact dimensions
- Soft-close seat
Cons
- Gold finish may show fingerprints
- Higher price tier
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Its MAP 1000g siphon jet flush ensures powerful and quiet performance. The dual-flush system saves significant water annually while maintaining efficiency.
The gold finish may require careful cleaning to avoid visible marks over time. The premium look and feel come with a higher price tag.
Ideal for those wanting a statement piece that blends functionality and luxury. This model brings a distinctive flair to any bathroom setting.
Luxurious Aesthetic Appeal
Gold button accent elevates the bathroom's style with a premium look.
Efficient Performance
MAP 1000g flush ensures reliable waste removal with minimal water use.
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7. St. Tropez Comfort Height One-Piece Elongated Toilet – Traditional One Piece Toilet
St. Tropez Comfort Height One-Piece Elongated Toilet
Vortex Dual-Flush
1.1/1.6 GPF
Elongated Bowl
Scratch Resistant
St. Tropez offers a reliable traditional option with vortex flush technology that scrubs the bowl thoroughly. Its durable ceramic resists scratches and maintains a clean appearance over time.
Pros
- Vortex cyclonic rinsing
- Durable non-porous ceramic
- Elongated comfort bowl
- Water efficient flush
- Classic white finish
Cons
- Basic traditional design
- Hardware may need upgrades
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The elongated bowl provides extra room and comfort compared to round models. Water efficiency is ensured with dual-flush options ranging from 1.1 to 1.6 GPF.
Design may lack the modern sleekness of skirted models. White hardware is standard but may need upgrading for a more customized look.
Best for those preferring a classic look with proven durability and performance. This model serves well for standard bathroom upgrades.
Vortex Flush Technology
Cyclonic rinsing action ensures thorough bowl cleaning with each flush.
Durable Construction
Non-porous scratch-resistant ceramic maintains appearance and hygiene easily.
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8. DeerValley Compact One Piece Toilet Modern – Versatile One Piece Toilet
DeerValley Compact One Piece Toilet Modern
24.5 inch Length
Quiet 28dB Seat
Side-Access Panels
Tool-Included Kit
This versatile DeerValley model combines compact design with modern features like side-access panels for easier plumbing. Its quiet operation makes it ideal for shared or guest bathrooms.
Pros
- Compact space-saving
- Extremely quiet operation
- Side-access panels
- Dual Flush efficiency
- Easy installation kit
Cons
- Standard seat height
- Compact bowl less spacious
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The dual-flush system delivers powerful flushing while saving significant water annually. Fully skirted design ensures effortless cleaning and a streamlined look.
Standard seat height may not suit taller users needing extra comfort. The compact size reduces floor footprint but limits seating space slightly.
Perfect for small bathrooms needing efficient plumbing access and quiet performance. This model balances practicality with everyday comfort.
Quiet Operation
Soft-close seat operates at 28dB ensuring minimal disturbance at night.
Installation Ease
Side-access panels simplify plumbing connections during installation.
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9. CANEST GF-002 Compact One Piece Toilet – Efficient One Piece Toilet
CANEST GF-002 Compact One Piece Toilet
23.5 inch Depth
Dual-Flush 1.1/1.6
Quick-Release Seat
Seamless One-Piece
CANEST GF-002 holds a perfect 5.0 rating for its slim profile and reliable siphon flushing. Its 23.5-inch depth maximizes space while providing comfortable seating for most users.
Pros
- Slim 23.5 inch depth
- Perfect 5.0 rating
- Easy installation
- Soft-close seat
- Integrated tank design
Cons
- Smaller tank capacity
- Compact bowl size
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The integrated tank-and-bowl design eliminates leak-prone joints, ensuring durability. Dual-flush options help reduce water bills significantly over time.
The compact design may limit water capacity slightly compared to standard sizes. Seating area is narrower which could affect larger users.
Ideal for maximizing space in small bathrooms without sacrificing quality. This model is perfect for efficient, high-performance toilet replacement.
Perfect User Satisfaction
A 5.0 rating reflects high customer satisfaction with design and performance.
Space Optimization
Slim 23.5 inch depth makes it ideal for tight spaces.
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Buying Guide – How to Choose the Best One Piece Toilets
Selecting the right one piece toilet involves considering several key factors including size, flushing performance, and comfort features. This guide helps you prioritize what matters most for your bathroom needs.
Bathroom Size and Rough-In Distance
Measure your bathroom space carefully including floor clearance and wall distance. Most toilets use a standard 12-inch rough-in measurement from the wall to the drain center. Compact models with shorter lengths or depths work well for smaller or powder rooms.
Ensure the toilet fits comfortably without blocking doors or other fixtures. Verify rough-in dimensions before purchasing to avoid installation issues later.
Flushing Technology and Performance
Look for powerful siphon jet or dual flush systems that balance water savings with effectiveness. A MaP score of 1000 or higher indicates strong waste clearance and lower clog risk. Air-pressure assisted systems are great for low water pressure environments.
Prioritize models with proven flush performance ratings for reliability. Efficient flushing saves water and money while maintaining a clean bowl.
Comfort Height and Accessibility
Comfort height toilets range between 17 to 19 inches from floor to seat offering easier sitting and standing. ADA compliant models are ideal for seniors or those with mobility needs. Standard seat heights may feel too low for taller users.
Choose a height that suits all household members' needs for daily comfort. Proper ergonomics prevent strain and improve usability over time.
Water Efficiency and Dual Flush Options
Dual flush toilets offer separate options for liquid and solid waste typically 0.9 to 1.28 gallons per flush. WaterSense certified models meet EPA standards reducing water usage by up to 20 percent compared to older units. Efficient flushing saves on utility bills significantly.
Select toilets that combine strong performance with low GPF ratings. Water saving features contribute to environmental sustainability and cost savings.
Material Quality and Durability
High-quality vitreous china resists stains yellowing and scratches ensuring long-lasting performance. Look for smooth glaze finishes that are easy to clean and maintain hygiene. CUPC certification indicates compliance with safety and performance standards.
Investing in durable materials reduces future repair or replacement costs. Premium construction protects against common bathroom wear and tear.
Installation and Maintenance Considerations
Most one piece toilets come with complete installation kits including wax rings and bolts. Skirted designs simplify cleaning by eliminating hidden crevices that collect dirt. Side access panels make plumbing connections faster and more straightforward for pros.
Ease of installation saves time and labor costs during replacement. Simple maintenance ensures the toilet stays hygienic and functional for years.
Seat Features and Comfort
Soft-close seats prevent slamming noise and are easier on bathroom fixtures. Quick-release mechanisms allow simple removal for thorough cleaning. Choose elongated bowls for comfort and round bowls to save space.
Quality seats enhance daily comfort and hygiene. Features like quick-release extend the toilet lifespan by simplifying upkeep.
Aesthetic Design and Finish
One piece toilets offer a seamless modern look that elevates bathroom style. Options range from sleek white finishes to bold accents like gold buttons. Skirted bases provide a streamlined appearance without visible tank bolts.
Choose designs matching your bathroom theme for a cohesive look. Modern aesthetics combine function with attractive visuals.
How to Use and Care for Your One Piece Toilet
Clean the bowl and seat regularly using non-abrasive cleaners and soft cloths to maintain glaze integrity. Avoid harsh chemicals that damage seals or plastic parts over time.
Check flush valves and wax rings periodically for leaks or misalignment. Tightening bolts occasionally helps keep the unit secure and wobble-free during use.
Use dual flush buttons appropriately to maximize water savings. Replace seats every few years if hinges or soft-close mechanisms wear out.
Frequently Asked Questions
What is the difference between one piece and two piece toilets?
One piece toilets have an integrated tank and bowl making cleaning easier and reducing leak risks. Two piece models have separate parts bolted together which can trap dirt in the gap. One piece units often look sleeker and are more modern in design.
Are one piece toilets harder to install?
One piece toilets weigh more but installation is similar since tank and bowl come pre-assembled. You do not need to connect them separately saving some labor steps. Ensure the floor is level to prevent instability after installation.
How much water do dual flush toilets save?
Dual flush toilets save up to 16,500 gallons per year compared to traditional 3.5 gallon flush models. Using lighter flush options for liquid waste reduces overall household water use significantly. This also lowers monthly water bills.
What rough-in measurement fits most homes?
A standard 12-inch rough-in fits most residential bathrooms where the drain center is 12 inches from the wall. Some older homes may use 10 or 14 inches so measure carefully. Choosing the correct size ensures proper fit without plumbing modifications.
Do one piece toilets require special cleaning products?
No special products are needed since most use standard porcelain glaze resistant to stains. Regular mild cleaners and brushes work effectively on skirted and smooth surfaces. Avoid abrasive scrubbers that scratch or dull the finish.
Are ADA height toilets better for everyone?
ADA height toilets offer 17 to 19 inches which suits most adults by reducing knee and back strain. They are especially beneficial for seniors or those with mobility challenges. Even average height users often find comfort height easier to use daily.
What is a MaP score and why does it matter?
MaP measures maximum performance testing how much solid waste a toilet clears per flush. A score of 1000 grams indicates high efficiency and low clog risk. Higher MaP ratings ensure reliable flushing without needing extra water or effort.
Final Thoughts on Choosing the Best One Piece Toilets
The DeerValley Elongated One-Piece Toilet leads as Editor's Choice for its perfect balance of comfort flushing power and design. Casta Diva models shine with premium features like air-pressure assist and unique finishes that elevate any bathroom. For budget buyers the DeerValley Compact offers reliable performance in a space-saving footprint.
Prioritize factors like MaP performance height comfort and water efficiency to match your household needs. One piece toilets simplify maintenance and modernize bathrooms with their sleek seamless designs. Selecting the right model ensures daily comfort and long-term value.
Always check current prices and availability before finalizing your purchase as offers change frequently. These top-rated options provide reliable choices for any bathroom upgrade project. With careful selection your new toilet will serve efficiently for years to come.