Choosing among the best rated dual flush toilets comes down to more than flush strength. You’ll also want to check the rough-in, bowl shape, seat height, overall dimensions, and how much cleaning the design may require. The five options below include compact one-piece models, an elongated toilet with a 1,000-gram MaP claim, and a two-piece option from American Standard. Compare the specifications with your bathroom layout before choosing.
Table of Contents
Quick Comparison
| Toilet | Design and dimensions | Flush details | Notable feature |
|---|---|---|---|
| HOROW T0338W One-Piece Toilet | One piece; 26.6 × 15 × 26 in.; elongated | Dual flush, 1.1/1.6 GPF; 1,000g MaP claim | 17.3-inch seat height; 10- or 12-inch rough-in versions |
| SOTOMO Elongated One-Piece Toilet | One piece; 28.4 × 15.5 × 26.6 in.; elongated | Dual flush, 1.1/1.6 GPF; 1,000g MaP claim | 12-inch rough-in; rimless swirl flush |
| DeerValley Compact One-Piece Toilet | One piece; 24.5 × 13.375 × 28.375 in.; round bowl | Dual flush, 1.1/1.6 GPF | Compact footprint and standard seat height |
| American Standard H2Option | Two piece; elongated; chair height | Dual flush, 0.92/1.28 GPF; 1,000g MaP score | WaterSense certified; slow-close seat included |
| SOTOMO Compact Elongated One-Piece Toilet | One piece; 27.75 × 15.4 × 27.13 in.; elongated | Dual flush, 1.1/1.6 GPF; 1,000g MaP claim | 12-inch rough-in; quick-release seat |
Our Picks: Best Rated Dual Flush Toilets reviews
1. HOROW T0338W: Best for Chair-Height Comfort
The HOROW T0338W combines an elongated bowl with a 17.3-inch seat height, making it a strong option if you prefer a taller seat. Its one-piece body has a compact listed depth of 26.6 inches, which may help when floor space is limited. Check the full dimensions against your room before ordering, since the bowl shape and required clearance matter as much as the depth.
Its dual-flush system uses 1.1 or 1.6 gallons per flush. The manufacturer also lists a siphon flush, a fully glazed 2-inch trapway, and a 1,000-gram MaP performance claim. The included soft-close PP seat is designed to close quietly. One-piece construction has fewer exterior joints to clean than a two-piece toilet.
Installation fit is a key detail: HOROW offers 10- and 12-inch rough-in versions, so you need to select the version that matches your plumbing layout. The large side access openings are intended to make floor mounting easier, but the toilet still needs careful alignment and a secure installation.
Pros:
- Taller 17.3-inch seat height may suit adults seeking a chair-height seat.
- Two flush volumes provide a lower-water option for liquid waste.
- One-piece body and glazed trapway simplify some cleaning tasks.
- Available in rough-in options for different bathroom layouts.
Cons:
- You must choose the correct rough-in version before purchase.
- The 1.6-gallon flush uses more water than the American Standard’s full flush.
Verdict: Choose the HOROW if you want an elongated, one-piece toilet with a notably taller seat and a choice of rough-in sizes.
2. SOTOMO Elongated One-Piece Toilet: Best for a Rimless Flush Design
This SOTOMO model is an elongated, skirted one-piece toilet with a 12-inch rough-in. Its listed dimensions are 28.4 inches deep, 15.5 inches wide, and 26.6 inches high, so it takes up more depth than the HOROW. Measure from the finished wall to the center of the drain to confirm the rough-in before buying.
The toilet uses a 1.1/1.6 GPF dual flush and a rimless swirl-style flush. The product description also lists a fully glazed trapway and a 1,000-gram MaP claim. Its average flush use is stated as 1.28 GPF. The elongated seat is listed at 18.43 inches, while the seat height is listed at 16.8 inches; those measurements refer to different parts of the seating area.
The smooth, skirted exterior has fewer hard-to-reach spaces than a design with exposed sides. A quick-release seat can make deeper cleaning easier, and the package description includes installation parts such as a wax ring and floor bolts. The one-piece ceramic body may be heavy to position, and the manufacturer recommends two people for lifting.
Pros:
- Rimless swirl design and glazed trapway are intended to support waste removal and easier cleaning.
- Elongated seat offers a roomier seating shape.
- Quick-release, soft-close seat is practical for cleaning and quieter use.
- Installation parts are listed as included.
Cons:
- Its 28.4-inch depth may be a poor fit for a very small bathroom.
- Two people are recommended to lift the one-piece unit.
Verdict: This SOTOMO is a good fit if you want a skirted elongated toilet with a rimless flush design and have room for its deeper footprint.
3. DeerValley Compact Toilet: Best for Tight Bathrooms
The DeerValley is the most compact option in this group by its listed dimensions: 24.5 inches long, 13.375 inches wide, and 28.375 inches high. It uses a standard-height round bowl, a useful combination if your bathroom is tight on space or you prefer a shorter seat. The product description lists a seating capacity of up to 250 pounds.
Its dual-flush system offers 1.1- and 1.6-gallon flushes. The skirted one-piece design reduces exterior crevices, while the included soft-close PP seat is described as operating quietly. The package is listed with a pre-assembled valve, wax ring, bolts, wrench, and manual, plus side-access panels for plumbing work.
The compact shape is its clearest advantage, but it may not offer the same sitting space as an elongated bowl. Its standard seat height may also be less comfortable for people who prefer a taller chair-height toilet. Compare the dimensions and seat style with your needs rather than assuming a smaller model will feel right for everyone.
Pros:
- Compact dimensions and round bowl suit many space-limited bathrooms.
- Dual flush lets you choose between 1.1 and 1.6 GPF.
- Skirted exterior and soft-close seat are practical for everyday use.
- Installation kit and side-access panels are included according to the product details.
Cons:
- Standard-height, round-bowl seating may feel less roomy than an elongated, taller model.
- The listed capacity is 250 pounds, so check that limit against household needs.
Verdict: Pick the DeerValley if saving floor space is your top priority and you are comfortable with a standard-height round bowl.
4. American Standard H2Option: Best for Low-Volume Flushes
The American Standard H2Option is a two-piece, elongated toilet with chair-height seating and a push-button actuator on the tank lid. Its dual-flush volumes are 0.92 and 1.28 gallons per flush, lower than the 1.1/1.6 GPF systems on the other models in this roundup. The manufacturer lists a MaP score of 1,000 grams and WaterSense certification.
The included package is described as containing a slow-close seat, chrome actuator, bolt caps, and wax ring. Its EverClean surface is designed to help prevent buildup between the bowl and tank. Compared with the one-piece choices here, the two-piece construction has a separate tank and bowl, which can mean more joints to clean but may be a familiar setup for many bathrooms.
The product data lists this model as unavailable, so its listing status may affect whether you can order it. Confirm current availability and that the model’s dimensions and rough-in match your bathroom before planning an installation. The supplied details do not give its measurements or rough-in size.
Pros:
- Uses the lowest listed flush volumes in this comparison.
- WaterSense certified, with a stated MaP score of 1,000 grams.
- Elongated chair-height design and slow-close seat are included.
- Push-button actuator makes the two flush choices easy to identify.
Cons:
- Availability may vary, so confirm the listing before making plans.
- Dimensions and rough-in details are not provided in the supplied product information.
Verdict: Consider the H2Option if water-efficient flush volumes and an established two-piece design are your priorities, but verify availability and fit first.
5. SOTOMO Compact Elongated Toilet: Best for a Skirted, Easy-Clean Exterior
This SOTOMO model pairs an elongated seat with a skirted, one-piece body. It measures 27.75 inches deep, 15.4 inches wide, and 27.13 inches high, and is designed for a 12-inch rough-in. The seat is listed as 18.75 inches long, which gives it a more spacious shape than the round-bowl DeerValley.
The toilet uses 1.1/1.6 GPF dual flush and a siphon-jet system. The manufacturer lists a fully glazed 2-inch trapway and a 1,000-gram MaP claim. It also describes the flush as averaging 1.28 GPF. The soft-close seat has a quick-release feature, which can make it easier to remove for cleaning.
The product details say that the valve is pre-installed and that the package includes a wax ring, floor bolts, and instructions. Side-mounted access points are intended to help with installation, but the one-piece body can be awkward to handle. Two people are recommended for lifting. Its listed availability is limited in the supplied data, so check the listing before choosing it for a project.
Pros:
- Elongated seat and skirted body combine comfort with a smoother exterior.
- Quick-release, soft-close seat supports easier cleaning and quiet closing.
- Dual-flush volumes and a glazed trapway are intended to balance water use and flushing performance.
- Several installation parts are listed as included.
Cons:
- Requires a 12-inch rough-in, which may not match every bathroom.
- Two people are recommended to lift the one-piece toilet, and availability may vary.
Verdict: Choose this SOTOMO if you want an elongated, skirted toilet with a quick-release seat and your bathroom has a 12-inch rough-in.
How to Choose a Dual Flush Toilet
Match the Rough-In to Your Bathroom
The rough-in is the distance from the finished wall to the center of the toilet drain. Measure it before ordering and check the product’s required size. The HOROW is offered in 10- and 12-inch versions, while both SOTOMO models listed here require a 12-inch rough-in. The supplied details do not specify the American Standard’s rough-in, so confirm it with the product listing or manufacturer.
Measure the Full Footprint
Compare each toilet’s depth, width, and height with the space available, including room for the door to open and for you to sit comfortably. The DeerValley is the shortest by its listed length, while the first SOTOMO model is the deepest. A compact toilet can free up floor space, but its shape and dimensions still need to work with your plumbing and bathroom layout.
Choose the Bowl Shape and Seat Height You Prefer
Elongated bowls generally provide a longer seating area, while round bowls can be useful where floor space is tight. Seat height also affects comfort. The HOROW lists a 17.3-inch seat height, and the American Standard is described as chair height. The DeerValley uses a standard-height round bowl. Check the stated seat height, not just the overall toilet height, when comparing models.
Compare Flush Volumes and Performance Claims
Dual-flush toilets have separate flush options, often with a lower-volume choice for liquid waste and a higher-volume choice for solid waste. The HOROW and SOTOMO models use 1.1/1.6 GPF; the DeerValley uses the same listed volumes. The American Standard lists 0.92/1.28 GPF and WaterSense certification. MaP claims and flush-system descriptions can help you compare specifications, but they do not replace checking that the model suits your household and plumbing.
Consider Cleaning and Seat Features
One-piece and skirted designs have fewer visible joints or exterior crevices to clean than many traditional two-piece designs. A fully glazed trapway, quick-release seat, and soft-close hinges may also be useful features. These details do not remove the need for regular cleaning, so focus on features that make your normal bathroom routine easier.
Check What Comes in the Box
Toilet packages can differ. Some product descriptions list a wax ring, floor bolts, installation tools, or a pre-installed valve, while others may require you to source parts separately. Review the included components before installation, and consider using a qualified plumber if you are unsure about the drain, water supply, or toilet mounting.
Think About Installation and Handling
A one-piece toilet is a single ceramic unit, which can be bulky to move and position. The SOTOMO descriptions recommend two people for lifting. Compare the installation instructions and included hardware with your skills and tools. The toilet must be aligned correctly with the drain and secured without damaging the floor or fixture.
Frequently Asked Questions
What does a dual flush toilet do?
A dual flush toilet gives you two flush options with different water volumes. The lower-volume option is intended for liquid waste, while the higher-volume option is intended for solid waste. The exact volumes vary by model.
Which toilet in this list is the most compact?
The DeerValley has the smallest listed length and width in this group at 24.5 inches by 13.375 inches. It has a round bowl and standard seat height, so compare those features with your comfort needs as well as your available space.
Are all of these toilets chair height?
No. The HOROW lists a 17.3-inch seat height, and the American Standard is described as chair height. The DeerValley is described as standard height. The SOTOMO models list seat-height details in their product descriptions; check the exact listing measurements before ordering.
How do I know which rough-in size I need?
Measure from the finished wall behind the toilet to the center of the floor drain. Compare that measurement with the toilet’s rough-in requirement. If you are unsure where the drain center is or how to account for baseboards, ask a plumber to confirm the measurement.
Does a one-piece toilet make cleaning easier?
It can reduce the number of exterior joints and hard-to-reach spaces around the tank and bowl. Skirted sides and quick-release seats may also make certain areas easier to reach. You will still need to clean the bowl, seat, base, and surrounding floor regularly.
Which model uses the least water per flush?
The American Standard H2Option lists flush volumes of 0.92 and 1.28 GPF, the lowest figures among these choices. It is also listed as WaterSense certified. Confirm current product details before buying, especially if certification or water use is a deciding factor.
Can I install a one-piece toilet myself?
Installation depends on your experience, the toilet’s weight, and the condition of your plumbing and floor. Some models include installation parts, but a one-piece unit can be difficult to position. Follow the manufacturer’s instructions, use another person to help lift when recommended, and hire a plumber if you are uncertain.
Final Recommendation
The HOROW T0338W is the most balanced choice here if you want an elongated bowl, chair-height seating, and a choice of rough-in sizes. For a very small bathroom, the DeerValley’s compact round-bowl design is the more space-focused pick. If minimizing flush volume is your priority, compare the American Standard’s listed 0.92/1.28 GPF options and confirm that it is available and fits your plumbing. In every case, verify rough-in, dimensions, and included installation parts before ordering.
