Choosing the best flushing one-piece toilet means balancing flush performance with water use, comfort, and the space available in your bathroom. The options below range from compact round-bowl designs to elongated chair-height models. Compare their listed flush systems, dimensions, and included parts, then check the rough-in and installation requirements before choosing.
Table of Contents
Quick Comparison
| Toilet | Flush system | Bowl and height | Standout feature |
|---|---|---|---|
| Casta Diva Elongated One Piece Toilet | Dual flush, 1.1/1.6 GPF; MAP score listed as 1,000 grams | Elongated; 17-inch seat height | Compact dimensions and soft-close, quick-release seat |
| DeerValley Compact One Piece Toilet | Dual flush, 1.1/1.6 GPF | Round bowl; standard seat height | Space-saving 24½-inch length |
| WOODBRIDGEE Chair-Height One Piece Toilet | Listed as 1.28 GPF dual flush; MAP score listed as 1,000 grams | Chair-height design | Concealed trapway and removable soft-close seat |
| American Standard Champion 4 One Piece Toilet | 1.6 GPF | Elongated; 16½-inch bowl height | Large flush valve and wide glazed trapway |
| WOODBRIDGEE Modern Dual-Flush One Piece Toilet | Dual flush, 1.0/1.6 GPF; MAP score listed as 1,000 grams | Elongated | Low 1.0 GPF option and skirted trapway |
Our Picks: Best Flushing One Piece Toilet reviews
1. Casta Diva Elongated Toilet: Best for Comfort Height and a Dual Flush
The Casta Diva combines an elongated bowl with a 17-inch seat height and a dual-flush system. Its listed flush rates are 1.1 gallons per flush for liquids and 1.6 GPF for solids. The product description also gives it a 1,000-gram MaP score and describes a fully glazed trapway, making flush performance a central part of its pitch.
Its one-piece, skirted shape has fewer exposed contours around the base than a traditional two-piece toilet, which can make the outside easier to wipe down. The listed dimensions are 27.17 inches deep, 14.37 inches wide, and 25.39 inches high. It uses a standard 12-inch rough-in, and the package description lists a slow-close, quick-release seat, wax seal, and installation hardware.
This is a strong fit if you want an elongated bowl, a taller seat, and separate flush choices. Its listed depth is worth checking against your bathroom layout, and the 17-inch seat may not suit someone who prefers a lower seat. The manufacturer lists a one-year limited service warranty and lifetime technical consulting; confirm the warranty terms with the seller before purchase.
Pros:
- Dual flush offers 1.1 and 1.6 GPF options.
- 17-inch seat height may be easier to use than a lower seat.
- Quick-release, slow-close seat is included.
- 12-inch rough-in and installation parts are listed.
Cons:
- The taller seat may not suit every household member.
- Check the listed dimensions carefully in a tight bathroom.
Verdict: Choose the Casta Diva if comfort height, an elongated bowl, and a dual-flush system matter more to you than a very short footprint.
2. DeerValley Compact Toilet: Best for a Small Bathroom
The DeerValley is the most compact option in this group by its listed length: 24½ inches. Its round bowl and standard seat height are designed for smaller bathrooms where an elongated bowl or taller seat may take up too much room. The listed dimensions are 24½ inches long by 13⅜ inches wide by 28⅜ inches high.
It uses a 1.1/1.6 GPF dual-flush system and has a skirted exterior intended to simplify cleaning around the base. The package description includes a soft-close seat, wax ring, bolts, wrench, and manual. Side-access panels are also listed to make plumbing access easier, though you should still confirm the installation steps and fit for your bathroom before ordering.
Compared with the chair-height choices here, this model prioritizes a smaller footprint and a standard-height seat. That can be helpful in a powder room or other tight space, but the standard height may be less convenient for people who prefer a taller seat. The listing specifies a 250-pound seating capacity and a 12-month warranty.
Pros:
- Short listed length suits space-conscious layouts.
- Round bowl and standard seat height keep the design compact.
- Dual flush offers 1.1 and 1.6 GPF options.
- Installation kit and soft-close seat are included.
Cons:
- Standard seat height may be less comfortable for some people.
- Round bowl provides less front-to-back room than an elongated bowl.
Verdict: The DeerValley is the practical pick when saving space is your top priority and a standard-height, round-bowl toilet fits your needs.
3. WOODBRIDGEE Chair-Height Toilet: Best for a Taller Seat and Concealed Trapway
This WOODBRIDGEE model is designed around a chair-height seat and a smooth one-piece profile. The description says the bowl rim is intended to fall within the 17- to 19-inch range with the seat included, but it does not give a specific seat measurement. Check the exact installed height if that measurement is important for your household.
The listing describes a siphon flush, a fully glazed flush system, and a 1,000-gram MaP flush score. It also calls the toilet WaterSense certified and says it is listed at 1.28 GPF with dual flush in the title. Because the description does not spell out the two flush rates, verify the exact flush options and certification details on the product listing before buying.
A concealed trapway and smooth sides reduce exposed curves and corners around the base, which can make routine cleaning simpler. The package description includes a pre-installed soft-close seat with stainless-steel hinges, a wax ring, floor bolts, and a hand wrench. This model may be a good match if you value chair-height seating and a cleaner exterior, but the supplied specifications do not list its dimensions or rough-in size.
Pros:
- Chair-height design is aimed at easier sitting and standing.
- Concealed trapway creates a smoother outside surface.
- Listed 1,000-gram MaP score and fully glazed flush system.
- Soft-close seat and installation parts are included.
Cons:
- The exact seat height and toilet dimensions are not provided in the supplied details.
- Confirm the dual-flush rates and rough-in requirements before ordering.
Verdict: Consider this WOODBRIDGEE if you want a chair-height design and concealed trapway, provided the seller confirms the dimensions and flush details you need.
4. American Standard Champion 4: Best for a Wide Trapway and Simple Flush Setup
The Champion 4 pairs an elongated bowl with a 1.6 GPF flush. Its listed flushing components include a 4-inch flush valve and a 2⅜-inch fully glazed trapway. Those larger passages distinguish it from the dual-flush choices in this lineup, which offer lower-volume options for some flushes.
The one-piece construction has fewer seams between tank and bowl, while the product description says its EverClean surface inhibits stain- and odor-causing buildup. The bowl height is listed as 16½ inches, and a slow-close seat, chrome trip lever, and bolt caps are included. That height is slightly below the 17-inch seat listed for the Casta Diva.
This model may suit you if you prefer a straightforward single-flush design and want the listed large valve and trapway. Its 1.6 GPF rate is higher than the lower option on the dual-flush toilets here, and the supplied details do not list its rough-in size or overall dimensions. Confirm those measurements and the installation requirements before purchase.
Pros:
- Large 4-inch flush valve and 2⅜-inch glazed trapway.
- Elongated bowl and one-piece construction.
- Slow-close seat is included.
- 16½-inch bowl height is specified.
Cons:
- Single 1.6 GPF flush does not offer a lower-volume option.
- Overall dimensions and rough-in size are not included in the supplied details.
Verdict: Choose the Champion 4 if you want a single-flush toilet with a wide listed flush valve and trapway, and its 1.6 GPF rate suits your priorities.
5. WOODBRIDGEE Modern Dual-Flush Toilet: Best for a 1.0 GPF Option
This elongated WOODBRIDGEE toilet offers a dual-flush system listed at 1.0 and 1.6 GPF. It is the lowest stated light-flush rate among the five options, while retaining a higher-volume choice. The description also lists a 1,000-gram MaP score and a fully glazed siphon flush system.
The skirted trapway gives the toilet a smooth outside profile with fewer grooves to reach while cleaning. A soft-close seat with stainless-steel hinges is pre-installed, and the package description includes a wax ring, floor bolts, instructions, and a hand wrench. The listing says the toilet meets US UPC and Canada CSA standards and describes it as WaterSense certified; check the product page for current certification and installation information.
This model is a useful comparison with the Casta Diva: both are elongated, skirted toilets with a dual flush and a listed 1,000-gram MaP score, but this model lists a 1.0 GPF option while the Casta Diva lists 1.1 GPF for liquids. The supplied details do not provide dimensions, seat height, or rough-in size, so verify those points before deciding whether it will fit your bathroom.
Pros:
- Dual-flush rates are listed as 1.0 and 1.6 GPF.
- Listed 1,000-gram MaP score and fully glazed flush system.
- Skirted exterior is designed for easier cleaning.
- Soft-close seat and installation parts are included.
Cons:
- Dimensions, seat height, and rough-in size are not stated in the supplied details.
- Confirm the flush settings and fit before ordering.
Verdict: The WOODBRIDGEE Modern is worth considering if you want an elongated dual-flush toilet with a listed 1.0 GPF option, as long as its measurements fit your bathroom.
How to Choose a Flushing One-Piece Toilet
Compare the Flush System and Water Use
Look at both the flush mechanism and the listed gallons per flush. Dual-flush models let you select between two flush volumes, while the Champion 4 uses a single 1.6 GPF rate. The WOODBRIDGEE Modern lists a 1.0/1.6 GPF system, and the Casta Diva and DeerValley list 1.1/1.6 GPF. A MaP score is another specification to compare when it is provided, but it does not tell you whether the toilet will fit or feel comfortable in your bathroom.
Measure the Space and Rough-In
Measure the available floor area, including the distance from the wall to the toilet’s mounting bolts, and compare it with the manufacturer’s rough-in requirement. Also check the toilet’s full depth and width, nearby doors, and clearance around the bowl. The DeerValley provides compact dimensions, while the Casta Diva lists a 12-inch rough-in and its overall measurements. For models without those details in the supplied specifications, confirm them with the seller before buying.
Choose a Bowl Shape and Seat Height
Round bowls can help save space, as on the DeerValley, while elongated bowls provide a longer seating area and are used by several other picks here. Seat height affects how easy it is to sit down and stand up. The Casta Diva lists a 17-inch seat height, and the Champion 4 lists a 16½-inch bowl height. Check whether a stated measurement includes the seat, since product descriptions may define height differently.
Consider Cleaning and One-Piece Design
A one-piece toilet joins the tank and bowl into a single unit, avoiding the seam between separate pieces. Skirted or concealed-trapway designs also cover more of the exterior plumbing shape, which can make the outside easier to wipe. These features do not remove the need to clean the bowl, seat, and floor around the toilet. Check the product dimensions and access points as well as its appearance.
Check What Comes in the Box
Included parts differ by model. Some listings specify a wax ring, bolts, seat, and tools, while others mention only a smaller set of accessories. Confirm whether the toilet includes the parts needed for your installation and whether you need to buy anything separately. Also check whether your existing water supply, flange, and bathroom layout are compatible.
Review Installation and Support Details
One-piece toilets can be bulky to move and position, so consider whether you can safely handle installation or need a plumber. Look for clear instructions, access to the mounting bolts, and the manufacturer’s support and warranty terms. Product specifications are not a substitute for checking local plumbing requirements or confirming fit with your installer.
Frequently Asked Questions
What makes a one-piece toilet different from a two-piece toilet?
A one-piece toilet has its tank and bowl joined as a single unit, while a two-piece model has a separate tank attached to the bowl. The integrated shape has fewer seams between those parts to wipe around, but its size and installation needs still vary by model.
Which toilet in this list is the most compact?
The DeerValley has the shortest listed length at 24½ inches and uses a round bowl. Compare its full dimensions with your available floor space, since a compact length alone does not guarantee a fit.
Which models offer a dual flush?
The Casta Diva and DeerValley list 1.1/1.6 GPF flush rates, and the WOODBRIDGEE Modern lists 1.0/1.6 GPF. The other WOODBRIDGEE model is described as dual flush in its title, but its supplied description does not give the two rates, so confirm them before buying.
Is a higher toilet seat always more comfortable?
Not for everyone. A taller seat may make sitting and standing easier for some people, while others prefer a lower seat. Check the seat-height measurement and whether it includes the seat before choosing.
What does a MaP score mean?
MaP is a flushing-performance measure expressed in grams. The Casta Diva and both WOODBRIDGEE listings in this comparison state a score of 1,000 grams. Use that figure alongside the toilet’s flush rate, fit, and installation requirements rather than as the only deciding factor.
What should I measure before ordering?
Check the rough-in, available floor depth and width, seat height, and clearance from nearby walls or doors. Confirm that the model’s listed dimensions and installation requirements match your bathroom and plumbing setup.
Final Recommendation
For a balanced combination of an elongated bowl, 17-inch seat height, dual flush, and clearly listed dimensions, the Casta Diva is the strongest all-around choice in this group. If your main constraint is limited space, consider the compact DeerValley. For a lower listed flush option, compare the WOODBRIDGEE Modern, but verify its dimensions and rough-in before ordering.
