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10 Best One Piece Toilets 2026 in the United States

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Our Top Picks

#1

Winner

KOHLER K-5172-0 San Souci Comfort Height Compact Elongated 1.28 GPF Toilet with Aqua Piston Flushing Technology and Left-Hand Trip Lever

Rating
10.0
Chosen by1,194
Bowl Shape
Water Consumption
Material and Finish

Most important from
97 reviews

Bowl Shape
This toilet combines comfort and space-saving design with its compact elongated bowl, offering more seating comfort without taking up extra room.
Water Consumption
The 1.28 gallons per flush delivers strong, efficient performance, helping reduce water usage without compromising on cleanliness.
Material and Finish
Its sleek, modern design and smooth finish make it an attractive upgrade, perfectly complementing a variety of bathroom styles.
Seat Type
The Quiet-Close seat adds a practical touch, preventing slamming and enhancing the overall user experience.

The KOHLER K-5172-0 San Souci is a one-piece toilet designed for comfort and efficient performance. It features a compact elongated bowl that offers more seating comfort than a round bowl while occupying similar space, making it a smart choice for bathrooms where space is limited but comfort matters. This model has a Comfort Height of about 28 inches, which is slightly taller than standard toilets, facilitating easier sitting and standing for most adults.

It utilizes KOHLER's Aqua Piston flushing system, a strong gravity-powered flush that cleans the bowl thoroughly with just 1.28 gallons of water per flush. This low water usage contributes to water bill savings and environmental friendliness. The toilet also includes a concealed trapway and Clean Caps, making it easier to clean and providing a sleek appearance without exposed pipes. Made from durable vitreous china ceramic, it has a smooth white finish that resists stains and scratches. The included seat is a high-density polyethylene Quiet-Close type that prevents slamming and remains securely in place. The left-hand trip lever is standard and easy to operate.

Weighing 94 pounds, the toilet is somewhat heavy and may require two people for safe installation. While the flushing system is powerful, some users might prefer dual-flush models for more water-saving flexibility during light use. Additionally, the left-hand lever placement may not suit all bathroom layouts, so verifying compatibility before purchase is recommended. This KOHLER toilet is suitable for those seeking a comfortable, efficient, and easy-to-clean one-piece toilet with a modern design, especially in smaller bathrooms where space-saving is important.

Rating
10.0
Chosen by1,194
Bowl Shape
Water Consumption
Material and Finish

Most important from
97 reviews

Bowl Shape
This toilet combines comfort and space-saving design with its compact elongated bowl, offering more seating comfort without taking up extra room.
Water Consumption
The 1.28 gallons per flush delivers strong, efficient performance, helping reduce water usage without compromising on cleanliness.
Material and Finish
Its sleek, modern design and smooth finish make it an attractive upgrade, perfectly complementing a variety of bathroom styles.
Seat Type
The Quiet-Close seat adds a practical touch, preventing slamming and enhancing the overall user experience.
#2

KOHLER K-6428-0 Memoirs Stately Comfort Height Skirted One-Piece Compact Elongated 1.28 GPF Toilet with AquaPiston Flush Technology and Left-Hand Trip Lever, White

Rating
9.7
Flushing System
Trapway Design

Most important from
15 reviews

Flushing System
This toilet is polite with clean lines and a compact profile, and has great sucking power, making it ideal for households with heavy usage.
Trapway Design
The floor attachment system is elegant and easy to clean, with no visible bolts, adding to the toilet's sleek look.

The KOHLER K-6428-0 Memoirs Stately Comfort Height Toilet is designed for comfort and efficiency, making it a solid choice for those looking for a reliable one-piece toilet. Its compact elongated bowl provides added sitting comfort while maintaining a smaller footprint, which is great for tighter spaces. The comfort height feature elevates the seat to a chair-like height, facilitating easier use for most adults, particularly the elderly or those with mobility issues.

One of the standout features is its AquaPiston flush technology, which allows water to enter the bowl from all sides. This design not only enhances the flushing power but also reduces the chances of clogs, making it effective in terms of performance. The 1.28 gallons per flush (GPF) water consumption meets WaterSense certification, indicating it is water-efficient and can help save on utility bills.

There are a few points to consider. At 114.49 pounds, this toilet is quite heavy, which may complicate installation if you're not experienced. Although it includes a quiet-close seat, it does not come with a supply line, so you may need to purchase one separately, adding to the overall cost. While the left-hand trip lever may suit most users, some may prefer a right-hand option based on their bathroom layout.

Rating
9.7
Flushing System
Trapway Design

Most important from
15 reviews

Flushing System
This toilet is polite with clean lines and a compact profile, and has great sucking power, making it ideal for households with heavy usage.
Trapway Design
The floor attachment system is elegant and easy to clean, with no visible bolts, adding to the toilet's sleek look.
#3

TOTO® WASHLET®+ Nexus® One-Piece Elongated 1.28 GPF Toilet with S7A Contemporary Bidet Seat, Cotton White - MW6424736CEFG#01

The TOTO WASHLET+ Nexus One-Piece Toilet is an elongated-shaped toilet, which many find more comfortable compared to round bowl designs. The integrated WASHLET+ bidet seat offers a variety of luxurious features including warm water washing, an auto open/close lid, a heated seat, and a warm air dryer. These features can greatly enhance the user experience with customizable settings for temperature and pressure.

Furthermore, the EWATER+ system mists the wand and toilet bowl, helping to keep the unit clean without harsh chemicals. The toilet uses a 1.28 gallons per flush (GPF) system, making it water-efficient and eco-friendly. At 27 inches in height, it is a comfortable height for most users, and its sleek design hides water supply and power cords for a cleaner look.

The toilet and bidet are made from a combination of ceramic and plastic materials, finished in a cotton white color, which can easily fit into most bathroom decors. One potential downside is its relatively high weight at 116 pounds, which might make installation more challenging. Additionally, the bidet seat is made of plastic, which may not feel as premium as other materials. The contemporary design and array of features make it a great choice for those looking to upgrade their bathroom experience with advanced convenience and cleanliness features.

Buying Guide for the Best One Piece Toilets

Choosing the right one-piece toilet involves understanding your needs and preferences, as well as the key specifications that differentiate various models. One-piece toilets are known for their sleek design and ease of cleaning, as the tank and bowl are integrated into a single unit. To make an informed decision, consider the following key specifications and how they align with your requirements.
Bowl ShapeThe bowl shape of a toilet can be either round or elongated. Round bowls are more compact and are ideal for smaller bathrooms, while elongated bowls offer more comfort and are better suited for larger spaces. Consider the size of your bathroom and your personal comfort preferences when choosing the bowl shape.
Flushing SystemThe flushing system determines how effectively the toilet clears waste. Common types include gravity-fed, pressure-assisted, and dual-flush systems. Gravity-fed systems are quieter and more common, pressure-assisted systems offer a powerful flush but can be noisier, and dual-flush systems provide options for water conservation. Choose a flushing system based on your preference for noise level, water efficiency, and flushing power.
Water ConsumptionWater consumption is measured in gallons per flush (GPF). Toilets typically range from 1.28 GPF to 1.6 GPF. Lower GPF models are more water-efficient and can help reduce your water bill, while higher GPF models may offer a more powerful flush. Consider your priority between water conservation and flushing performance when selecting the water consumption rate.
HeightToilet height can affect comfort, especially for taller individuals or those with mobility issues. Standard height toilets are around 15 inches from the floor to the seat, while comfort height toilets are around 17 to 19 inches. If you have specific comfort needs or accessibility requirements, opt for a comfort height toilet.
Trapway DesignThe trapway is the channel that waste travels through to reach the plumbing. A fully glazed trapway can help prevent clogs and ensure a smoother flush. Some toilets also feature a concealed or skirted trapway for easier cleaning and a more streamlined appearance. If ease of maintenance and aesthetics are important to you, consider these design features.
Material and FinishMost one-piece toilets are made from vitreous china, which is durable and easy to clean. The finish can be standard or include special coatings that resist stains and bacteria. If hygiene and ease of cleaning are top priorities, look for toilets with advanced finishes.
Seat TypeToilets can come with different types of seats, such as standard, soft-close, or heated. Soft-close seats prevent slamming and are quieter, while heated seats offer added comfort. Choose a seat type based on your comfort preferences and the features you value.

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