10 Best One Piece Toilets 2026 in the United States

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.

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.

The Casta Diva Elongated One-Piece Toilet is a compact, modern choice designed to blend style with functionality. Its one-piece, skirted design makes cleaning easier and helps prevent leaks, which is a real plus in bathroom maintenance. The elongated bowl shape offers more seating comfort compared to round bowls, and the 17-inch ADA comfort chair height suits most adults, making it easier to sit and stand up. It features a dual-flush system with options for 1.1 gallons per flush (liquids) and 1.6 gallons per flush (solids), meeting EPA WaterSense standards for water efficiency, so it helps save water without sacrificing flush power.

The flushing system uses a powerful siphon jet with a fully-glazed trapway, which usually means quiet and effective flushing with less risk of clogs. The toilet's dimensions are on the compact side, which is good for smaller bathrooms. Its seat is made from durable polypropylene with a soft-close function, preventing loud slamming and adding to user comfort. Installation is straightforward with a standard 12-inch rough-in and included hardware, even for those with little plumbing experience.

Weighing 125 pounds means it might be a bit heavy to handle during installation without help. Also, while the design is modern and smooth, some may prefer a different seat shape than the U-shaped one provided. The one-year limited warranty and lifetime technical support add peace of mind. This toilet is a solid pick for anyone looking for an efficient, comfortable, and stylish one-piece toilet, especially suited for small to medium-sized bathrooms.