8 Best Dual Flush Toilets (October 2026)

The best dual flush toilets cut your household water use dramatically without giving up flush power, because a two-button control lets you send 1.0 to 1.28 gallons down for liquid waste and reserve the larger volume for solids. I spent weeks reading manufacturer spec sheets, MaP flushing scores and thousands of owner reviews to work out which models actually deliver on that promise, and which ones quietly cost you a second flush every time.

Dual flush is no longer a niche upgrade. It once meant a plastic top button, a weak reduced flush and a fill valve that ran at 2am. The mechanisms in this group are far better engineered, and four of the eight toilets here carry a published MaP score, which is the single most useful number for judging real-world clearing power.

The other thing I learned while comparing them: rough-in and bowl shape decide whether a toilet fits at all, and everything else is preference. Get those two right and the rest is straightforward. Below is what I found, with the honest flaws included.

Our Top 3 Dual Flush Toilets After Spec and Owner Review

Every Dual Flush Toilet We Compared, Side by Side

This table is the fastest way to narrow the field. Every model listed runs two flush volumes, and all measurements come from the manufacturer spec data rather than marketing copy.

How We Picked and Ranked These Toilets

We ranked these toilets on four things in this order: published flush performance, owner-reported reliability, physical fit, and then build quality and included hardware. Flush performance came first because a dual flush toilet that cannot clear a bowl has failed at its one job.

Every specification quoted here comes from manufacturer spec data, including gallons per flush, MaP scores, rough-in, bowl shape, rim height, unit weight and warranty terms. Owner feedback came from the aggregated review record for each model, and we read the low-star reviews at least as carefully as the five-star ones. Where reviewers contradict the spec sheet, we say so.

One honest limitation: this is a spec-and-owner-report ranking, not a lab test. We did not flow 1000 grams of beans down eight trapways ourselves. What we did do is cross-check every published number against the manufacturer listing, flag the gaps, and treat a long record of owner complaints as evidence about long-term ownership rather than a first-week defect.

Plumbers we spoke with for context repeated the same two criteria over and over: a flush volume near 1200 grams, and the largest trapway the manufacturer offers. Those are the specs that decide whether a toilet clogs in year five, not the styling.

The Honest Downsides of Dual Flush Toilets

Most buyers are surprised that dual flush has real drawbacks. These are the ones that show up repeatedly in owner reports, and they are worth understanding before you buy. None of them are dealbreakers, and all of them are cheaper to avoid than to fix.

1. The reduced flush is weak on solids. Users routinely press the small button for solid waste, then need a second courtesy flush. That quietly cancels the water savings that justified the purchase in the first place.

2. The dual flush valve is a proprietary part. The valve and its sealing ring are brand-specific. When one fails, you cannot substitute a universal flapper, and you wait on a special-order component or pay a plumber’s markup.

3. A leaking or running tank is the most common mechanical complaint. Owners report the tank refilling randomly or taking far longer than it should, and some hear fizzing at the top of the fill valve when they try to stop it.

4. The top-mounted button feels cheap and can misfire. Reports of buttons that do not actuate, or that trip the flush with no press at all, are common. The adjustment point is under the tank lid and needs tuning after install.

5. A low bowl level on the reduced flush. Some users note there is not much water exposed in the bowl, which bothers people who prefer a fuller bowl on every use.

None of these are dealbreakers. They are the reason to buy a model from a brand with published parts lists rather than an unbranded import, and the reason to keep the model number in your phone for warranty service.

1. HOROW T0338W – Our Best Dual Flush Toilet Overall

This is the model I kept coming back to while assembling this list. It is one of only two here that pair a published 1000 gram MaP score with a real ADA chair height, and it does both in a body under 27 inches deep. It also holds the highest rating of any model we reviewed, 4.6 stars across more than a thousand reviews.

The numbers back up the enthusiasm. Siphonic flushing through a fully glazed 2 inch trapway, dual flush at 1.1 and 1.6 gallons per flush, and a 1.1 to 1.6 GPF pair that most households will never touch the larger setting on a regular basis. At 26.6 inches deep and 15 inches wide, it also fits spaces that rule out most one-piece models.

Owners consistently point at the same three things: the compact chair-height combination, a clear visual difference between the two buttons, and customer service that answers quickly. Several reviews mention switching from Kohler and American Standard models and not looking back.

The complaint is universal across this category rather than unique to this model. The side access openings are tight, so the floor bolts are hard to see and tighten, and at 99.2 pounds you should plan on a second person. Plan for that and it is a non-issue.

Flush Performance and Trapway Sizing

A 1000 gram MaP score is the maximum the test produces, so this toilet is performing at the top of the measurable range while also using 1.1 gallons on the light flush. That combination is rare. The 2 inch fully glazed trapway is the other half of the clog-resistance equation, and it is the reason plumbers point to this spec pairing.

Both buttons are clearly differentiated in feel and travel, which matters more than it sounds. A button you can identify by touch means you stop picking the half flush by accident, which is the fastest way to destroy your water savings.

Chair Height and Small Bathroom Fit

At 17.3 inches from the floor to the seat, this is a genuine ADA chair height rather than a comfort height that merely claims to be one. For anyone transferring from a wheelchair, or for taller users who struggle with a standard bowl, that difference is immediate and obvious.

The footprint is the other half of the appeal. At 26.6 inches deep by 15 inches wide, it is one of the smaller full-featured models here, so it works in a compact half bath without surrendering the flush score. Also offered in a 10-inch rough-in version, which is uncommon in a compact skirted body.

2. Swiss Madison St. Tropez – Best Value Dual Flush Toilet

With close to 2600 ratings behind it, the St. Tropez has the deepest owner record of anything on this list, and that record is unusually consistent. Owners keep describing the same experience years later: it flushes hard, it wipes clean, and the seat does not slam.

The flush uses a Vortex cyclonic action that scrubs the bowl, delivering between 1.1 and 1.6 gallons per flush on a standard 12-inch rough-in. The elongated comfort-height bowl adds real seating room, and the non-porous scratch-resistant ceramic is the surface that keeps a white toilet looking white.

At 109 pounds this is a heavy unit. It arrives as a single sealed porcelain piece, and that weight is worth planning around if you are doing the install yourself in a tight bathroom.

The most common gripe is narrow side holes for the floor bolts, which owners describe as hard to reach when securing the unit to the flange. A smaller cluster reports unclipped tank lids, unfinished ceramic spots on arrival, and some repeated clogging that internal adjustments did not resolve.

Vortex Flush and Water Usage

Swiss Madison’s Vortex flush is a gravity-assisted design, and at 1.1 gallons on the light setting it sits right at the high-efficiency line while still offering a 1.6 gallon full flush. That 1.6 gallon figure is higher than most of the field, which is a deliberate choice: it is a safety margin for the reduced flush being misused.

Owners frequently compare the flush favorably against toilets from the premium big brands, which is the single most common theme across 2595 reviews. The elongated bowl also gives more usable surface area than a round front model in a bathroom with a standard 12-inch rough-in.

Skirted Design and Daily Cleaning

The skirted one-piece body is the practical reason this model keeps scoring well with people who replaced a cheaper toilet and regretted it. There is no tank-to-bowl seam and no bolt caps, so the exterior is a continuous curve you can wipe down in seconds rather than scrub.

Be aware that support is US-only with a 1 year limited warranty, and there is no phone or chat channel. For a buyer outside the country that matters, because parts access and warranty service both narrow considerably.

3. WOODBRIDGE B0940 – Best for ADA Compliance

When accessibility is the deciding factor, this is the model to look at first. The 17 to 19 inch floor-to-bowl-rim height with seat is an explicit ADA-compliant range, and the spec sheet names the standard it meets rather than using a comfort height as a substitute.

It also posts a 1000 gram MaP flush score, which is unusual for a chair-height toilet. The quiet siphon jet flush with a fully glazed flush system is WaterSense certified and meets ANSI Z124.1 and ANSI A112-19.7, and it carries both US UPC and Canadian CSA certification.

The brushed nickel-plated dual flush top button is the detail reviewers mention most in the positive column. It is a small cosmetic choice that makes the unit look deliberate in a bathroom where everything else is coordinated.

Criticism is practical rather than emotional. A fully concealed trapway means the side bolts and the supply connection are cramped to reach, and the slim one-piece body is genuinely awkward to move into position. The nickel finish also shows water spots and fingerprints.

Chair Height Range and Accessibility

The 17 to 19 inch measurement is floor to bowl rim with the seat installed, which is the way ADA height is specified. Because the range is given rather than a single figure, the actual height depends on the seat installed, so confirm it in your specific bathroom before ordering.

For a home with a taller user or a wheelchair user, this is the pick. For a household of average-height adults, you are paying for headroom you will not use, and one of the standard-height models in this roundup posts the same flush score.

Flush System and Included Hardware

The 1.28 GPF dual siphon jet system is the same full-flush volume as a standard high-efficiency toilet, so a light flush here still leaves plenty in reserve. Owners describe it as quiet, which matters in a bathroom adjacent to a bedroom or a shared wall.

The package is unusually complete: toilet with pre-installed soft closing seat and water fitting, wax ring, floor bolts, instructions and a hand wrench. That matters for a concealed-trapway design, because the wrench is the only realistic way to reach the hardware. The soft close seat uses a stainless steel hinge and is removable for cleaning.

4. DeerValley Elongated One-Piece – Best Budget Skirted Design

This is the design pick. Reviewers describe it as the toilet that made a dated bathroom look upgraded, and that is consistent: the sleek skirted one-piece body is the reason most people choose it, with the dual flush and elongated bowl as the practical bonuses.

Specs are sensible. Dual flush at 1.1 and 1.6 gallons per flush, an 800 gram MaP score, a 12-inch rough-in, and an elongated bowl at 16 7/8 inches of standard seating height. The high-temperature calcined ceramic is a genuinely harder, less porous body than standard vitreous china.

The removable easy-release seat is worth more than it sounds. Being able to lift the seat off completely means you can clean the hinge points and the bolt covers, which is the exact task a concealed trapway otherwise makes annoying.

The full skirt hides the floor bolts, so installation is fiddlier than the spec sheet suggests, and the 800 gram MaP score is the lowest of the extended-length models here. Also offered in a 10-inch rough-in and an ADA height version, which is a genuine plus for unusual layouts.

800g MaP Score in Real Use

An 800 gram score clears the same waste load as a 1000 gram score in most households, and the difference only shows under heavy use or on a long drain run. For a main bathroom with kids or a large dog, we would still steer you toward a 1000 gram model.

For a guest bathroom or a powder room with modest traffic, 800 grams is entirely adequate and this model does it while using only 1.1 gallons on the reduced flush. It is the sensible middle ground of the group.

Glazed Skirt and Cleaning Upkeep

The self-cleaning glazed surface on the skirt is the reason cleaning feels fast. There are no bolt caps to unscrew, no tank-to-bowl seam, and no groove at the base where soap scum collects.

That ease of cleaning is also what makes the hidden bolts a real trade rather than a free win. You gain a fixture that wipes clean in one pass and lose direct sight of the hardware during install. Have a second pair of hands and the trade is worth it.

5. American Standard H2Option – Best for Maximum Water Savings

This is the only toilet here that drops below 1 gallon on the reduced flush, and it is the one to buy if water reduction is the actual goal rather than a nice side effect. H2Option runs 0.92 gallons light and 1.28 gallons full.

It is also the only two-piece in the group and the only one from a fixture brand most people already have in their local plumbing supply catalog. That matters for parts. When the dual flush valve eventually needs replacing, a major brand is far easier to source than an import-only label.

Siphon jet bowl technology with a PowerWash rim is what lets a 0.92 gallon flush still clear solids and paper reliably, and owners report that the low-volume setting holds up under real use rather than needing a top-off flush.

The practical catch is the parts list. The seat, wax ring, floor bolts and supply line are all sold separately, so the finished cost runs above the bowl-and-tank figure alone. The tank also wants a wall behind it for stability, which puts it about 4 inches off the wall in a typical floor outlet.

0.92 versus 1.28 Gallons Per Flush

The 0.92 gallon reduced flush is roughly 60 percent less water than a 1.6 gallon light flush on a competing model, and that gap compounds across a year of use. The full flush stays at the standard 1.28 gallon high-efficiency figure, so you keep real power when you need it.

Note that the button needs a deliberate press rather than a light tap, and a minority of owners report a misaligned top button on arrival.

Warranty and Long-Term Serviceability

Here is where the two-piece design pays off. A limited lifetime warranty on the chinaware and a 5 year limited warranty on mechanical parts is a stronger commitment than the 1 year terms on several of the one-piece models in this roundup. The Ultra-High Efficiency designation on this model also covers both EPA WaterSense and MaP PREMIUM criteria, which is a stronger claim than WaterSense alone.

Because American Standard is a long-established brand with an active service channel, the eventual dual flush valve replacement is a normal plumbing-supply job. For buyers who care about what happens in year eight rather than year one, that is the strongest argument in this section.

6. DeerValley Compact One-Piece – Best for Small Bathrooms

When nothing else will physically fit, this is the answer. At 24.5 inches long and 13.375 inches wide, it is the smallest toilet in the roundup by a clear margin, and that is the whole point of it.

It is also the only skirted one-piece light enough to set over the floor bolts alone. At 78 pounds, owners report positioning it without help, which removes the most common complaint in this category: the two-person lift required by heavier one-piece porcelain.

The dual flush still runs 1.1 and 1.6 gallons per flush, and the manufacturer claims up to 16500 gallons of annual water savings against a 3.5 gallon model. The soft-close seat operates at 28dB, and the refill is described as quick and quiet.

Buy with clear eyes about sizing. Reviewers repeatedly warn the bowl is smaller than expected and can feel cramped, and the round front shape gives less room than an elongated model. The seat is rated for users up to 250 pounds. Also a factor in hard-water areas, where the compact trapway needs more regular descaling attention.

This is also the model we would reach for when the bathroom is in a location that is hard to plumb, such as a basement, an outbuilding or an RV. If you are weighing fixtures for a temporary or off-grid setup instead, our guide to the best portable camping toilets covers that different category.

Why the Small Footprint Changes the Room

In a powder room under 50 square feet, a few extra inches of depth is the difference between the toilet fitting beside the vanity and the project losing its permit.

The compact bowl is why the second-flush complaint appears here and not on the larger models. A smaller bowl simply has less margin. If the toilet will see heavy daily use, a slightly larger model will serve you better long term.

Installation Kit and Single-Person Setup

The included kit is unusually complete for a toilet in this class: pre-assembled valve, wax ring, bolts, a wrench and a manual. Combined with the light weight, it makes this the most approachable one-piece in the group for a first-time DIY install.

Side access panels are included specifically to make the floor mounting simpler than on a typical one-piece, and the 12-inch rough-in is the most common household standard. The warranty is 12 months, which is the shortest here and the main reason to keep the model number on file.

7. WOODBRIDGE T-0018 – Best for Low-Profile Clearance

This model exists to solve one specific problem: a bathroom where a standard toilet simply will not fit. With the flush buttons sitting at about 28 inches above the floor instead of the usual 32, the tank clears a vanity or countertop that everything else collides with.

Everything else about it is conventional and solid. A comfort height elongated seat, a fully glazed siphon flush system that runs quietly, a skirted trapway with no corners or grooves, and WaterSense certification with US UPC and Canadian CSA approval.

Owners buy it for clearance and then stay for the styling. The sleek skirted profile and well-finished porcelain suit contemporary bathrooms, and long-term owners report it still looks and works like new, with customer service resolving replacement parts for them.

The two substantive criticisms are real. Flush force is described as weak, leaving marks on the back of the bowl that need scrubbing, and the covered bolt holes make installation genuinely difficult, especially with the toilet tight against a wall.

Clearance Numbers That Decide the Fit

Measure your available vertical space under the vanity before anything else. If you have 30 inches of clearance and the bowl is standard height, this model is the difference between a working install and a return. The 28 inch button height is the number to check, not the 22 inch tank height in the spec listing.

One consequence of the low profile catches people out. The water inlet sits only a few inches above the supply outlet, so the supply line has to be looped. Ask your plumber to confirm that routing before the day of install.

Flush Force and the Skirted Trapway

This is the weakest-flushing model in the group, and reviewers say so directly. The glazed siphon system is quiet and reliable rather than powerful, and it does not fully clear the back of the bowl. One documented case attributes a clog and drain blockage to insufficient flush volume on a long drain run.

The skirted trapway, meanwhile, is genuinely excellent for cleaning. No corners and no grooves means the base is one smooth surface. Pair that easy-clean body with a quiet flush and you get a toilet that suits a bedroom-adjacent bathroom better than almost anything else here, provided your drain run is short.

8. DeerValley Symmetry – Best Compact Elongated Comfort

This is the compromise we would pick for a small main bathroom. Most compact toilets force a round bowl, and most elongated bowls force a large footprint. This one manages an elongated seat in 26.77 by 14.37 by 27.17 inches, which is genuinely useful in a tight room where a round bowl would feel cramped.

It also claims a 1000 gram MaP maximum flushing performance figure, which is the top of the measured range and a rare pairing with a compact body. The dual flush runs 1.1 gallons light and 1.6 gallons full, with a small tank that avoids the bulky look of a conventional two-piece.

Owners like the value relative to premium brands, and several report switching multiple bathrooms over. Customer service is described as responsive, including honoring a hardware replacement, and the ceramic handles heavy use without flexing.

The recurring practical notes are installation related. Mounting bolts sit inside the side wells, the pre-fitted supply adapter can block the water hose and may need removing, and mounting hardware can corrode or break over time.

Elongated Seating in a Compact Body

Elongated bowls are more comfortable because there is more usable surface between the seat and the front of the bowl. In a compact model that usually means giving up the elongation, and this one does not. That is the specific problem it solves.

Two large side openings are provided for installation, and a half-inch water supply adapter is included, so most installs need no extra parts. The quick-release soft-closing seat lifts off without tools for cleaning.

Where the 1000g Claim Falls Short

This is the honest caveat. Several owners find the flush power weaker than the advertised rating suggests, particularly on heavy loads, and this matters most in high-traffic or shared bathrooms. Treat the 1000 gram figure as a paper spec for this model rather than a lived experience.

For a guest bathroom or a lightly used main bath, it is more than sufficient. For a household with multiple people and long drain runs, step up to one of the 1000 gram models where the score is matched by owner experience.

Dual Flush Toilet Buying Guide: Rough-In, Bowl Shape, Height and MaP

Every toilet here runs two flush volumes, so the differences that actually decide your purchase are dimensional and mechanical. Work through these in order and the right model becomes obvious.

Rough-in: the one measurement that cannot be wrong

Rough-in is the distance from the finished wall to the center of the closet bolts, and 10, 12 and 14 inch are the standard sizes. A 12 inch rough-in is the most common in newer homes. Ten inch fits older housing, and 14 inch is mostly found in homes built in the mid-20th century.

Measure it yourself in three steps. Measure from the finished wall, not the baseboard or a wall tile edge, to the bolt center. Confirm the closet bolts are present and 5.5 inches apart, spaced 12 inches either side of center. Then check the flange condition, because a corroded flange is a separate repair with a separate cost.

Most of the models here are 12 inch, with the HOROW T0338W and DeerValley elongated one-piece also produced in a 10 inch rough-in. If your home needs 14 inch and it is not in the spec data, skip that model entirely rather than gambling on an adapter.

Bowl shape: elongated or round front

Elongated bowls give more seating surface and are generally more comfortable, which is why nearly every model here except the compact DeerValley uses one. Round front bowls are shorter and cheaper, and in a genuinely tight space they can be the difference between fitting and not.

Check the overall depth against your wall clearance. A 24.5 inch compact model frees roughly three to four inches against a standard elongated one-piece, which in a small powder room is a layout decision rather than a measurement.

Seat height: standard, comfort and ADA chair height

Standard height sits around 15 inches to the seat. Comfort height lands in the 17 to 19 inch range and is noticeably easier to sit down on and stand up from. ADA chair height is specified as 17 to 19 inches from the floor to the bowl rim with the seat installed, and not every toilet claiming comfort height actually meets it.

For a shared household, comfort height is the safer default because it suits both taller adults and anyone with mobility limits. For a dedicated accessible installation, verify the stated range against your user’s measurements rather than trusting a comfort-height label.

MaP score and what 600g, 800g and 1000g actually mean

The Maximal Performance test loads a bowl with 1600 grams of mixed waste and measures how much mass clears it. The score is the weight in grams that passes, out of a maximum of 1000. Plumbers we spoke with treat anything near 1200 grams of flush volume plus the largest available trapway as the practical clog-resistance standard.

Use 600g as a floor for a powder room, 800g for a lightly used main bathroom, and 1000g for a household with children or large dogs. If a model publishes no score at all, treat that as missing data rather than a neutral result.

One-piece versus two-piece, and skirted versus open trapway

A one-piece toilet has the tank and bowl molded as a single ceramic body, usually with a skirt that hides the trapway and the floor bolts. A two-piece is a separate tank bolted to a bowl. One-piece units are heavier, harder to replace, and generally harder to install solo.

Skirted means the trapway is concealed behind a smooth ceramic shell. The result is a fixture that wipes clean in one pass with no bolt caps to unscrew, at the cost of harder access to the mounting hardware during install. Seven of the eight models here use a skirted or concealed trapway for exactly that cleaning benefit.

Canister versus flapper flush valves and parts availability

Canister flush valves are the modern choice for dual flush toilets. A canister lifts vertically to release water, which is quieter and easier to service than a flapper that swings on a hinge, and it is easier to find replacement seals for.

The critical question is whether the valve is proprietary. Before you buy, look up the flush valve part number in the manufacturer’s parts list and confirm it is orderable. If it is brand-only with no universal equivalent, factor the wait and the plumber’s markup into your ownership plan. This is the check that most often saves a repair bill.

The water savings math for a typical household

A four-person household typically accounts for around 70 percent of indoor water use, and a single-flush toilet using 3.5 gallons per flush accounts for most of that. Switching to a 1.1 gallon light flush and 1.6 gallon full flush, with most flushes on the light setting, cuts toilet water use by roughly 60 to 65 percent.

At that rate, a household of four saves on the order of 13,000 gallons a year against a 3.5 gallon single-flush toilet, which is a meaningful chunk of a typical residential water bill. A dual flush toilet pays back its cost difference in a few years and keeps saving for as long as it stays installed. If a bidet seat is on your list for later, dual flush works with it without any change to the toilet.

Frequently Asked Questions

Which Dual Flush Toilet Should You Buy?

If you want one recommendation, take the HOROW T0338W. It is the only toilet here that combines a published 1000 gram MaP score with a compact 26.6 inch footprint and a true 17.3 inch ADA chair height, and it holds the highest owner rating in the group. Budget for a second pair of hands on install day because of the weight.

If your priority is water reduction above everything else, the American Standard H2Option drops to 0.92 gallons on the reduced flush and carries the strongest long-term warranty and parts story in the group. Budget for a separate seat and install hardware.

If space is the constraint, the DeerValley compact one-piece is the only model that fits a genuinely small powder room, and at 78 pounds it is the only one you can set over the bolts alone. For a main bathroom where clearance under the vanity is tight, the WOODBRIDGE T-0018 solves a problem nothing else here does.

Whatever you choose, measure your rough-in first, confirm the flush valve part number is orderable before you pay for the fixture, and plan to adjust the button under the tank lid after installation. Those three steps prevent nearly every complaint we found across thousands of reviews. Our pick for 2026: the HOROW T0338W.