A dual flush toilet that promises water savings but leaves you reaching for the plunger on the first solid test isn’t a solution—it’s a tradeoff you didn’t agree to. The real challenge in this category is finding a unit that delivers a powerful, single-flush clearing action on the high setting while still offering a miserly low-volume option for liquids, all without relying on a flapper valve that degrades and leaks over time. Every millimeter of the trapway, every degree of the glaze, and every gram of the MaP score tells you whether a toilet will perform or just pretend to.
I’m Mo Maruf — the founder and writer behind The Tools Trunk. I’ve spent years analyzing plumbing hardware specifications, from rough-in measurements and flush valve diameters to the chemistry of vitreous china glazes, so you don’t have to guess which models actually hold up under daily use.
This guide cuts through the marketing to deliver a hard-nosed comparison of the top contenders currently on the shelf, helping you find the right dual flush toilet for your home without wasting money on a weak design that will need service in twelve months.
How To Choose The Best Dual Flush Toilet
Selecting a dual flush toilet means balancing water conservation with brute-force clearing power. A poor choice leaves you either double-flushing or facing a clogged bowl. Focus on the specs that define performance, not the marketing claims.
MaP Score and Flush Valve Diameter
MaP (Maximum Performance) measures the grams of solid waste a toilet clears in a single flush. A score of 800g is adequate; 1000g is the gold standard for families. The flush valve diameter ties directly to this score—a 3-inch valve releases water faster than a 2-inch valve, creating the hydraulic force needed to move waste before the bowl fills. Ignore any model that does not publish its MaP score or lists a valve smaller than 2 inches.
Bowl Shape and Seat Height
Elongated bowls offer 2 to 3 inches of extra length, which improves comfort for taller adults and provides a larger water spot that reduces staining. Round bowls save 3 to 4 inches of floor space, critical for tight half-baths. Seat height separates standard models (15 to 17 inches from floor to seat) from chair-height or ADA-compliant units (17 to 19 inches). Chair height reduces strain on knees and hips for seniors but can leave shorter users with dangling feet. Measure your existing toilet height before choosing.
Seat Material and Glaze Quality
PP (polypropylene) seats are light, cheap, and prone to yellowing after two years of UV exposure. UF (urea-formaldehyde) seats are heavier, denser, and resist scratches and yellowing for much longer. The bowl glaze matters equally—a high-fire vitreous china glaze with a non-porous finish prevents waste adhesion and makes cleaning a wipe-and-go task. Skirted trapways hide the ugly P-trap plumbing, eliminating dust-collecting crevices and making floor mopping truly effective.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Bolina W2111D | Premium | Power & compact footprint | 0.8/1.28 GPF, UF seat, Vortex flush | Amazon |
| TOTO Drake CST776CSFG | Premium | Brand reliability & glaze tech | 1.6 GPF, Tornado Flush, CEFIONTECT | Amazon |
| American Standard H2Option | Premium | ADA compliance & dual flush power | 0.92/1.28 GPF, MaP 1000g, EverClean | Amazon |
| Swiss Madison St. Tropez | Mid-Range | Aesthetic & easy cleaning | 1.1/1.6 GPF, skirted, black hardware | Amazon |
| HOROW HT1000 | Mid-Range | Small bathrooms | 1.1/1.6 GPF, 25″ depth, cUPC | Amazon |
| SOTOMO MY-2133 | Mid-Range | UF seat & space saving | 1.1/1.6 GPF, UF seat, 25″ depth | Amazon |
| HOROW HR-ST076WD | Mid-Range | Skirted design & quiet flush | 1.1/1.6 GPF, MAP 800g, skirted | Amazon |
| BYBARENOVA BBR-OPT0017 | Mid-Range | WaterSense & ADA height | 0.8/1.28 GPF, MaP 1000g, ADA | Amazon |
| Swiss Madison Sublime II | Budget | Tight spaces & round bowl | 1.1/1.6 GPF, 24″ depth, round bowl | Amazon |
In‑Depth Reviews
1. Bolina W2111D One-Piece Dual Flush Toilet
The Bolina W2111D sits at the top of this list because it delivers a 1000g MaP score with a 0.8-gallon liquid flush option—a combination most dual-flush toilets fail to achieve without sacrificing clearing power. Its Ultra-Swirl 360° Tornado Flush technology uses dual nozzles to create a vortex that scrubs the entire bowl surface, which directly reduces the staining that plagues single-nozzle designs. The V-shape elongated bowl provides a longer water spot than standard elongated bowls, lowering the frequency of bowl cleaning.
This unit is a one-piece skirted model, so there is no seam between tank and bowl where grime accumulates, and the hidden trapway makes mopping the floor a straight line. The UF seat is notably heavier and more rigid than the PP seats found on comparable models, and it resists the yellowing that cheap plastic seats show after a year of indirect sunlight. The compact depth makes it viable for small bathrooms—just verify your 12-inch rough-in before ordering.
Some buyers note the flush is louder than a gravity-fed whisper, typical of vortex systems that move water faster. The internal parts are not universal, so a future replacement may require sourcing Bolina-specific components, but the build quality at this tier justifies the trade-off. It is the best all-around performer for anyone who wants a powerful dual flush without moving up to TOTO pricing.
What works
- True 1000g MaP clearing on the 1.28 GPF full flush
- UF seat resists scratches and yellowing far better than PP
- Compact footprint fits tight bathrooms
What doesn’t
- Replacement parts may require special ordering
- Vortex flush creates more noise than siphon-only models
2. TOTO Drake Two-Piece CST776CSFG#01
The TOTO Drake name carries decades of reputation in the plumbing trade, and the CST776CSFG model earns its premium status with the Tornado Flush system that uses dual nozzles to create a centrifugal rinse rather than relying on conventional rim jets. The CEFIONTECT nano-ceramic glaze is the defining differentiator here—it forms a surface so slick that waste slides off without sticking, which means you clean the bowl far less often than with standard glazes. This is a two-piece design, so the tank sits separately on the bowl, which can simplify handling and future tank replacements.
The universal height (roughly 17 inches from floor to seat rim) meets ADA requirements without feeling too tall for average users. The 1.6 GPF rating is higher than the ultra-low-flow competition, but the trade-off is a flush that clears the bowl on the first try every time, even with heavy loads. The 3-inch flush valve delivers the water volume needed for that confidence. Customers consistently report zero clogging and zero staining over years of use, which is rare in this category.
The main drawbacks are that it does not include a seat and that the two-piece assembly means there is a seam to clean. The tank installation can be finicky—some users report the supplied rubber washers need careful seating or the tank will leak. Once it is sealed, though, the Drake is the most serviceable and widely supported toilet on this list, with replacement parts available at any hardware store.
What works
- CEFIONTECT glaze virtually eliminates staining
- Tornado Flush cleans the entire bowl surface
- Industry-standard parts easily found in stores
What doesn’t
- No seat included in the box
- Two-piece design has a seam that collects dust
3. American Standard H2Option 2886218.020
The direct-fed siphon jet delivers water into the trapway from a separate channel in the bowl, creating a faster evacuation than rim-fed designs. The EverClean surface treatment inhibits the growth of stain-causing bacteria between cleanings, which complements the fully glazed 2-inch trapway that resists clogging.
The chair-height bowl sits at 16.5 inches, and the elongated front adds several inches of seating length for taller users. The chrome push-button actuator sits on top of the tank, keeping the front profile clean. This is a two-piece toilet, so the bowl and tank come in separate boxes, which makes handling easier but adds a couple of additional connections. The limited lifetime warranty on the chinaware is among the strongest in the industry.
The H2Option uses a less common flush valve and fill valve combination, so future repairs may require ordering OEM parts rather than grabbing a universal kit at the big-box store. The elongated bowl extends to nearly 30 inches in depth, which pushes the toilet further into the room than round or compact models—measure your floor space carefully before purchasing.
What works
- Certified MaP 1000g with an ultra-low 0.92 GPF option
- EverClean surface reduces bacteria growth
- Strong lifetime warranty on china parts
What doesn’t
- Long bowl depth requires 30 inches of floor space
- Non-universal internal parts may limit repair options
4. Swiss Madison St. Tropez SM-1T254HB
The Swiss Madison St. Tropez stands out visually with its gloss white ceramic paired with black metal hardware—a contemporary look that complements matte black faucets and shower fixtures. Beyond the aesthetics, this is a fully skirted one-piece toilet, so there are no exposed plumbing lines at the base and no crevices for dust to gather. The 1.1/1.6 GPF dual flush is actuated by top-mounted chrome buttons that have a tactile, positive click rather than the mushy feel of some budget flush actuators.
The elongated bowl is 27 inches deep and 15 inches wide, providing generous seating area for taller family members. The soft-close seat with quick-release hinges allows the entire seat to detach at the push of a button, which makes deep cleaning around the hinge points much simpler. The fully glazed 2-inch trapway prevents the surface roughness that catches debris, and the skirted base means you can mop the floor in one continuous motion.
Installation is the main frustration with this model—the mounting nuts are recessed and difficult to access without a deep socket and extension, and the instructions are minimal. A tight rear wall space will make it hard to tighten the supply line connection. It is also one of the heavier single-piece units at 86 pounds, so you will want a second person for lifting.
What works
- Skirted design with sleek black hardware looks premium
- Quick-release seat hinge simplifies cleaning
- Top dual flush buttons feel durable and responsive
What doesn’t
- Tight bolt access makes installation painful
- Heavy unit requires two people to maneuver
5. HOROW HT1000 Dual Flush One Piece Toilet
The HOROW HT1000 is purpose-built for small bathrooms where every inch of floor space counts. At just 25 inches deep and 13.4 inches wide, it fits where a standard 28-inch elongated toilet would block a door swing or crowd a sink. Despite the compact footprint, the 16.5-inch seat height keeps it comfortable for adults. The round shape shortens the bowl, but the one-piece skirted construction still provides the same easy-to-mop base as the larger premium models.
The dual flush uses a chrome push button at the top of the tank, with cUPC and WaterSense certifications confirming the 1.1/1.6 GPF ratings. The soft-closing PP seat is standard height, and the stainless steel hinge allows the seat to be removed for thorough cleaning. The fully glazed trapway is 2 inches in diameter, which is adequate for a toilet of this size, though the MaP score is not officially published above 600g range. Customer feedback confirms it clears waste on the first flush in normal household use.
The PP seat is the weakest point—several users note it feels light and prone to sliding on the hinge over time. HOROW has replaced seats under warranty when this issue appears, but it is a known cost-saving measure. If you plan to use this toilet for a guest bath or secondary bathroom where usage is light, it is a smart space-saving choice.
What works
- Very compact 25-inch depth for tight spaces
- Skirted one-piece design cleans easily
- Responsive customer service for warranty claims
What doesn’t
- Lightweight PP seat can shift or slide
- Round bowl reduces seating area for large adults
6. SOTOMO MY-2133 Compact One Piece Toilet
The SOTOMO MY-2133 competes directly with the HOROW HT1000 for the small-bathroom crown but wins on seat material alone: it features a genuine UF (urea-formaldehyde) seat that does not yellow, scratch, or feel hollow. At 25 inches deep and 13.4 inches wide, its dimensions match the HOROW compact profile, but the UF seat adds a dense, solid feeling when sitting. The one-piece skirted ceramic body is fired at 2246°F, producing a vitreous surface that resists staining between cleanings.
The siphon jet dual flush offers 1.1 GPF for liquid and 1.6 GPF for solids, with the 2-inch fully glazed trapway preventing the surface roughness that catches paper. The soft-close mechanism on the seat is quiet—no plastic-on-plastic slamming. The quick-release hinge is a standard push-button detach, so cleaning around the hinge points is straightforward. Customer feedback consistently mentions the powerful flush relative to the compact size, with no clogs reported during normal use.
The seat height is 16.5 inches, which sits in the middle of the standard range—some tall users may find it slightly low compared to ADA chair-height options. The included wax ring is a standard thin ring; many users recommend replacing it immediately with a thicker wax or waxless gasket for a reliable seal. At roughly 97 pounds shipped, it still demands two people for a safe install.
What works
- UF seat feels premium and resists yellowing
- Compact dimensions exactly match tight bathroom layouts
- Customer support is fast and helpful
What doesn’t
- Included wax ring is minimal quality
- Seat height is standard, not ADA chair height
7. HOROW HR-ST076WD Dual Flush Elongated Toilet
The HOROW HR-ST076WD offers an elongated bowl in a relatively compact 28.75-inch depth package, making it a strong pick for small bathrooms that still need the extra seating length of an elongated profile. The MAP 800g rating means it clears 800 grams of waste per flush, which is adequate for most households but lags behind the 1000g models in this guide. The flapper-free design eliminates the most common leak path in dual flush toilets, using a tower-style seal instead that resists mineral buildup.
The siphon flush operates at a genuinely low noise level—users consistently describe it as quiet, which matters for bathrooms adjacent to bedrooms. The skirted trapway with fully glazed interior prevents clogs, and the self-cleaning glazing material helps reduce bowl staining between weekly cleanings. The chair-height seat at roughly 17 inches suits older adults and taller users. The soft-closing PP seat is standard but functional.
The PP seat is not as solid as a UF unit, and the glossy ceramic is prone to showing water spots in hard water areas unless you wipe it down regularly. The 101-pound shipping weight requires a dolly or helper for moving from the delivery point to the bathroom. For anyone wanting a quiet, elongated dual flush without spending premium dollars, this is a balanced choice.
What works
- Very quiet siphon flush ideal for shared bathrooms
- Flapper-free design eliminates a common leak source
- Elongated bowl in a space-saving depth
What doesn’t
- PP seat feels lighter than premium alternatives
- Gloss ceramic can show hard water spots
8. BYBARENOVA BBR-OPT0017 One Piece Toilet
The BYBARENOVA BBR-OPT0017 punches above its price tier by offering a MaP 1000g clearance rating with a 0.8 GPF liquid flush—a spec combination usually reserved for toilets costing significantly more. The 27-inch depth with a 15.5-inch width sits at the smaller end of the elongated bowl spectrum, making it suitable for medium-sized bathrooms. The fully skirted base means no exposed trapway, and the one-piece construction eliminates the tank-to-bowl gasket that can leak over time.
The ADA-compliant 17.3-inch seat height is genuinely comfortable for tall users and seniors, and the elongated shape provides the extra frontal space that round bowls lack. The soft-closing seat uses a screw-mount system that stays tight longer than the plastic snap-in systems found on budget models. The 360-degree siphon flushing is quiet and consistent—users note it clears the bowl on the first flush even when the low-flow option is selected.
The PP seat is standard density, not the premium UF feel, and certain customers note the push-button mechanism feels slightly less crisp than the chrome actuators on the premium tier. The included instruction manual is minimal, but the install is straightforward for anyone who has mounted a toilet before. Overall, it is the strongest value play on this list if MaP 1000g clearing power is your non-negotiable.
What works
- MaP 1000g at a mid-range price
- ADA-compliant 17.3-inch seat height is genuinely comfortable
- 360-degree siphon flush is quiet and reliable
What doesn’t
- PP seat is functional but not premium
- Flush buttons could feel more solid
9. Swiss Madison Sublime II SM-1T257
The Swiss Madison Sublime II is the shortest toilet in this roundup at just 24 inches deep, making it the go-to choice for extremely tight spaces like powder rooms, RV conversions, or cramped hall baths. The round bowl reduces overall depth by about 4 inches compared to elongated models, but the standard-height seat (around 16 inches) means shorter users and children will find it comfortable. The skirted one-piece body in glossy white looks far more expensive than its price point suggests.
The dual flush buttons offer the standard 1.1/1.6 GPF split, and the non-porous scratch-resistant ceramic does a decent job of resisting stains with routine cleaning. The soft-close quick-release seat allows the entire seat to detach for deep cleaning. The fully glazed trapway is 2 inches, which is adequate, but the round bowl’s smaller water surface means the bowl can show debris more readily than elongated designs.
Installation can be frustrating—the included wax ring is undersized, and the closet bolts in some packages have been reported as missing or incorrect. The standard-height seat is noticeably lower than ADA chair-height toilets, which can be a strain for tall users or anyone with mobility issues. For a guest bath or a child’s bathroom where space is the primary constraint, this toilet fits where nothing else will.
What works
- Smallest footprint at 24 inches depth
- Skirted one-piece design looks clean and modern
- Quick-release seat for easy cleaning
What doesn’t
- Standard height is too low for tall users
- Included wax ring and bolts are poor quality
Hardware & Specs Guide
Maximum Performance (MaP) Score
MaP is an independent test that measures how many grams of solid waste a toilet clears in a single flush. A score of 800g is adequate for a small household. A score of 1000g is the industry benchmark for reliable single-flush clearing with heavy usage. Models that do not publish a MaP score often clear less than 600g and may require double flushing. Always prioritize toilets with a listed MaP score, especially if the bathroom sees high traffic.
Flush Valve & Trapway Diameter
The flush valve diameter determines how fast water enters the bowl. A 3-inch valve releases water faster than a 2-inch valve, creating the hydraulic force needed for a strong siphonic action. The trapway is the curved channel waste travels through. A fully glazed 2-inch trapway prevents surface roughness from catching paper and debris. Un-glazed or partially glazed trapways are a sign of cost cutting and lead to clogs over time.
Seat Material: PP vs. UF
Polypropylene (PP) seats are lightweight, prone to yellowing, and feel hollow when you sit down. Urea-formaldehyde (UF) seats are denser, resist staining and UV yellowing, and feel solid. The difference is immediately noticeable in the hand, and UF seats hold their appearance for years longer. If the product description does not mention the seat material, it is almost certainly PP. Pay the small premium for UF when available.
Skirted vs. Standard Base
A skirted trapway hides the curved plumbing behind a flat ceramic panel. This eliminates dust-collecting crevices behind the bowl and lets you mop or wipe the floor in a continuous motion. Standard toilets leave the P-trap exposed, creating a crud trap that requires careful scrubbing. Skirted designs cost slightly more but save cleaning time over the life of the toilet.
FAQ
What is the difference between 1.1/1.6 GPF and 0.8/1.28 GPF dual flush?
Can I install a dual flush toilet myself or should I hire a plumber?
Why does my dual flush toilet keep running after a flush?
Does a chair-height (ADA) dual flush toilet fit the same rough-in as a standard toilet?
Final Thoughts: The Verdict
For most users, the Dual Flush Toilet winner is the Bolina W2111D because it combines a compact one-piece footprint, a premium UF seat, and a water sense-certified 0.8/1.28 GPF dual flush that still clears a full 1000 grams on the high setting. If you want the legendary stain-repelling glaze and the most serviceable parts availability on the market, grab the TOTO Drake CST776CSFG. And for the tightest bathroom spaces where every inch matters, nothing beats the Swiss Madison Sublime II at 24 inches deep.