Plumbing & Electrical

The Best One-Piece Toilets

This post contains affiliate links. As an Amazon Associate we earn from qualifying purchases.

Our picks are based on Amazon bestseller rankings, Amazon customer ratings, and product availability. We update our recommendations regularly to ensure accuracy.

A one-piece toilet combines the tank and bowl into a single, seamless unit, offering a sleek look and easier cleaning compared to traditional two-piece models. Selecting the right one-piece toilet is crucial for ensuring optimal performance, water efficiency, and a comfortable bathroom experience.

SaleNo. 1
HOROW T0338W One Piece Toilet with ADA Chair Height 17.3", Dual Flush | Powerful MAP 1000g Flush, Dual Flush...
  • Compact One Piece Design: Measuring 26.6"D x 15"W x 26"H, this compact elongated toilet fits small bathrooms while still offering comfortable seating. The seamless one-piece design also creates a cleaner look and is easier to wipe down around the...
  • ADA Chair Height Comfort: Features a 17.3" seat height from floor to seat for a more comfortable chair-height experience. Designed to make sitting down and standing up easier for many adults, seniors, and users seeking added accessibility.
  • Powerful Yet Water-Saving Flush: Built with siphon flushing and a fully-glazed 2" trapway to support strong waste removal. Dual flush options of 1.1/1.6 GPF help save water without giving up everyday performance.
  • Installation-Friendly with Rough-In Choices: Large side access openings simplify floor mounting. HOROW offers both 10-inch and 12-inch rough-in versions, so you can choose the one that matches your bathroom layout before installation.
SaleNo. 2
DeerValley Compact One-Piece Toilet 1.28 GPF Single Flush Fully Skirted Bowl with Soft-Close Seat White...
  • High Quality & Easy to Clean: The white toilet is sturdy, resistant to yellowing, and easy to clean with its self-cleaning glazed surface. Keep your bathroom effortlessly stylish and fresh with this long-lasting option.
  • Skirted Design for Easy Cleaning: The smooth skirted design of this modern one-piece toilet eliminates hidden corners and dirt traps, making cleaning effortless while maintaining a fresh and hygienic bathroom.
  • Water-Saving Powerful Single Flush: 1.28 GPF siphon flush saves water while efficiently removing waste, fully-glazed 2 3/8" trapway prevents clogs, keeps your elongated toilet tank clean and fresh every time.
  • Soft-Close & Quick-Release Seat: The white toilet comes with a soft-close seat to prevent slamming and a quick-release mechanism for easy removal, making deep cleaning and maintenance simple and convenient.
No. 3
Casta Diva Elongated One Piece Toilet with 17.2" ADA Comfort Height Seat | Modern Toilet for Bathroom, 1.0GPF...
  • Air-Pressure Assisted Flush (1.0 GPF): designed with a built-in tank and air pressure-assisted system, patented system delivers a powerful and efficient flush - even in low-pressure environments
  • Hands-Free Convenience: 1-piece toilet flush via foot-kick or side-button, ideal for hygienic and accessible use
  • Non-Electric Required: features powerful flushing without the need for electricity, making it a great choice for bathroom renovations
  • Powerful Siphon Flush: experience powerful flushing with the siphon jet system, achieving a MAP score of 1000g. 1.0 GPF water saving performance meets EPA's WaterSense criteria for superb water conservation
No. 4
DeerValley Compact One Piece Toilet Standard Seat Height for Small Bathroom Dual Flush 1.1/1.6 GPF Powerful...
  • Space-Saving Compact Toilet: Compact toilet (24½"L×13⅜"W×28⅜"H) with standard round bowl fits tight spaces, providing ergonomic seating up to 250 lbs. Ideal small toilet for small bathroom installations.
  • Water-Efficient Dual Flush Toilet System: One-piece toilet with 1.1/1.6 GPF dual flush technology saves up to 16,500 gallons annually, about 60% less water than 3.5 GPF models, while delivering powerful flushing performance.
  • Easy-Clean Skirted Toilet: Fully skirted toilet design eliminates hard-to-reach crevices for effortless cleaning, helping your bathroom stay spotless with minimal effort.
  • Quiet Soft-Close Seat: Includes a soft-close PP seat that operates at just 28dB for silent, smooth closing without slamming.
No. 5
Casta Diva Elongated One Piece Toilet with 17" Comfort Chair Height Seat | Compact Toilet for Bathroom, Dual...
  • Luxurious Modern Toilet for Bathrooms: skirted 1-piece toilet integrates the tank and bowl into a seamless, easy-to-clean design, no leaking tank problem
  • Powerful Siphon Flush Toilet: with a MAP rating of 1000, provides a powerful siphon jet flush performance, great performance flush score of 1000 grams and fully-glazed trapway bring a super quiet and powerful flush with no clogs
  • Water Saving Performance: dual-flush option (1.1 GPF for liquids, 1.6 GPF for solids), meets EPA's WaterSense criteria for superb water conservation
  • Comfort Height Toilet: our compact elongated toilet measures 27.17 inch Deepth x 14.37 inch Width x 25.39 inch Height, 17 inch ADA comfort chair seat height and bring convenience to users
SaleNo. 6
DeerValley Elongated One-Piece Toilet with ADA Chair Height Seat, DV-1F0437 | Dual Flush High Efficiency...
  • Luxurious Rimless Bowl Toilet for Bathrooms: Featuring a seamless one-piece build, this toilet makes a stylish impression with neat lines and a low-profile design. With a depth of 26.77 inches, width of 14.5 inches, and total height of 26.6 inches, the...
  • Dual-Flush Water Efficiency: This elongated toilet features a dual-flush system, offering 1 or 1.28 GPF per flush. Dual nozzles deliver a powerful, consistent flush with a 1000g MaP score, efficiently clearing waste while saving water and ensuring...
  • ADA-Height for Comfortable Use: Designed with an ergonomic ADA-compliant seat height of 17 1/2", this white toilet makes sitting and standing easier, offering enhanced accessibility and everyday comfort.
  • Soft-Close & Quick-Release Seat: Upgrade your bathroom toilet with a soft-close, quick-release seat that closes gently and quietly, preventing slams. The quick-release allows easy removal for simple cleaning, ensuring daily comfort and convenience.
No. 7
Erdoru Smart Toilet with Bidet and Heated Seat, One Piece Foam Shield Toilet with Hands-Free Auto Lid...
  • 【Eco-Powerful Flush】With a 1000g MAP rating and 1.28 GPF water-saving system, this tankless smart toilet delivers a strong yet quiet 360° swirling flush for thorough cleaning. It maintains full function during power outages via a manual side...
  • 【Multi-Functional Cleaning】Features feminine care, buttocks cleaning, and massage cleaning modes for diverse needs. With a self-cleaning nozzle, warm air drying, and foam shield technology, it ensures ultimate hygiene and comfort for a refreshing...
  • 【Foam Shield & Aroma Diffuser】Turn your toilet into a fresh oasis! The magic Foam Shield locks away odors and maintains perfect cleanliness, An included aroma diffuser releases a soothing fragrance that neutralizes unpleasant smells—brings a...
  • 【Night Light & Adjustable LED Strip】The smart toilet features a soft built-in night light and a dynamic digital display for both beauty and safety after dark. A 256-color LED strip adds a personalized glow, can be set to your favorite shade.
No. 8
Casta Diva One Piece Toilet Elongated with 17.5" ADA Height Comfort Seat | Compact Modern Toilets for...
  • 17.5" Comfort Height & Elongated Bowl: ADA Compliant Toilet, designed with an ergonomic comfort height seat 17.5" from floor to seat. Comfortable chair height makes sitting down and standing up easier, making it ideal for seniors and those needing a...
  • Powerful Siphon Jet Flush: MAP 1000g, experience the reliability of a powerful siphon jet flush that achieves a MAP Flush 1000g. The fully-glazed, wide trapway ensures waste flows smoothly, offering a super quiet and powerful flush, one-flush clean...
  • Water Saving Performance: Dual-flush system (1.0 GPF for liquids, 1.28 GPF for solids), meets EPA's WaterSense criteria for superb water conservation, Utilizing a high-efficiency 1.28 GPF flush provides significant water savings of up to 16,500 gallons...
  • Soft Close & Quick Release Seat: One button for removal or re-instal, with a superior quality PP soft-closing seat that closes quietly and slowly, preventing slamming and minimizing noise, ideal for night use
No. 9
DeerValley Symmetry One Piece Toilet, Dual Flush 1.1/1.6 GPF Elongated Standard Toilet for Bathroom, Toilets...
  • ELONGATED SEAT & SPACE SAVING: The compact toilet measures 26.77 " x 14.37 " x 27.17" inches, this toilet is more suitable for small bathroom use. Meanwhile, it has an elongated toilet seat, the elongated toilet seat is more ergonomic, providing you a...
  • POWERFUL & QUIET DUAL FLUSH: This one-piece toilet has a maximum flushing performance of 1,000 grams, with a siphon dual-flush design, 1.6 gallons of water for a full flush and 1.1 gallons of water for a light flush. Low-noise flushing and high...
  • EASY TO CLEAN: Compared to other toilets, the seamless, full-skirt trap design of the one-piece toilet has no corners or grooves, making it easy to clean.
  • QUIET TO USE: Modern toilets are designed with a soft-closing quick-release seat that closes gently and quietly, reducing noise during nighttime toileting.
SaleNo. 10
DeerValley Compact One Piece Toilet for Small Bathrooms with Soft Close Seat 12 Inch Rough Dual Flush...
  • Space-Saving Comfort & Efficiency: Designed to perfectly fit small bathrooms, this compact one-piece toilet maximizes available space without compromising on comfort or performance. With a space-saving design that protrudes just 24.6 inches from the wall...
  • High-Efficiency Dual Flush System: This Modern toilet features a high-efficiency dual flush system, offering two water-saving options: a full flush using 1.28 GPF and a half flush using 0.8 GPF. These options ensure water conservation without sacrificing...
  • Soft-Close & Removable Seat: The premium soft-close toilet seat gently shuts, reducing noise and offering a serene bathroom experience, especially at night. Crafted with durable materials and stainless steel hinges, the seat is built to last. It’s also...
  • Fully Skirted Trapway & Easy Maintenance: With a fully skirted trapway and a glazed surface, this bathroom toilet boasts a sleek, modern look while simplifying cleaning. The skirted design eliminates hard-to-reach corners and grooves, making it easy to...

Last update on 2026-10-16 / Affiliate links / Images from Amazon Product Advertising API

How to Choose the Best One-Piece Toilets

Understanding One-Piece Toilet Designs

One-piece toilets integrate the tank and bowl into a single, cohesive unit. This design eliminates the connection points found in two-piece toilets, reducing potential leak areas and simplifying installation. The seamless construction also contributes to a modern aesthetic and makes cleaning more straightforward due to fewer crevices.

Key Features to Consider

When choosing a one-piece toilet, several features warrant attention. Look for the flush mechanism, such as dual-flush options for water conservation, offering both a full and partial flush. Consider the flush power, often measured by a MaP (Maximum Performance) score, indicating its waste removal efficiency. Seat comfort and height are also important; comfort height (also known as ADA height) models are taller, making them easier to use for many adults.

Material and Durability

Most one-piece toilets are constructed from vitreous china, a durable and non-porous ceramic material. This material resists staining and odor absorption, ensuring longevity and ease of maintenance. Ensure the toilet's finish is smooth and well-glazed to prevent scratches and facilitate cleaning.

Installation and Maintenance

While the integrated design simplifies installation compared to some two-piece models, it's still a task that may require basic plumbing knowledge. Ensure you have the necessary tools and clear instructions. Maintenance typically involves routine cleaning of the bowl and ensuring the flush mechanism operates smoothly. The absence of separate tank-to-bowl seals means fewer potential points of failure over time.

Comparison Tips

When comparing models, prioritize water efficiency ratings, especially if you aim to reduce utility bills or live in a drought-prone area. Check the MaP score to gauge flushing performance. Consider the overall dimensions to ensure a proper fit in your bathroom space. Lastly, read user reviews to gain insights into long-term reliability and user satisfaction.

Frequently Asked Questions

What is the main advantage of a one-piece toilet?
The primary advantage is their integrated design, which eliminates the gap between the tank and bowl found in two-piece toilets. This makes them easier to clean, less prone to leaks, and often more aesthetically pleasing.
Are one-piece toilets harder to install?
While the integrated design simplifies some aspects, they can be heavier and bulkier due to the single unit construction. However, they eliminate the need to seal the tank to the bowl, which can be a tricky step in two-piece installations.
How do I know if a one-piece toilet will fit my bathroom?
Measure your existing toilet's rough-in distance, which is the distance from the wall behind the toilet to the center of the drain. Also, consider the overall width and depth to ensure it doesn't obstruct doors or walkways.
What does 'comfort height' or 'ADA height' mean for toilets?
Comfort height refers to toilets that are taller than standard models, typically around 17 to 19 inches from the floor to the seat. This height can make sitting down and standing up easier for many individuals, including seniors and those with mobility issues.
How do I choose the right flush mechanism?
Dual-flush toilets offer two flush options (full and partial) to conserve water, which can lower utility bills. Consider the MaP score for flushing power; a higher score indicates better waste removal efficiency.
Are one-piece toilets more durable than two-piece toilets?
Both types, when made from quality vitreous china, are generally durable. The one-piece design has fewer connection points, potentially reducing the risk of leaks over time from faulty seals.

How we compare Plumbing & Electrical

1 Specifications: we compare the key features and specifications listed by the manufacturer and on Amazon.
2 Customer ratings: we take into account the average Amazon rating and the number of reviews.
3 Price: we check the current price and highlight notable deals.
4 Updates: comparisons are refreshed regularly as prices and availability change.

Our comparisons are reviewed and updated regularly to reflect the latest products and prices.

Was this article helpful?

Thanks for your feedback!

Thanks — we'll work to improve this article.