Best Dual Flush Toilet: 8 Top Picks

In this article, we shall have a look at some of the best dual flush toilet available on the market. We shall compare different designs by leading manufacturers such as American Standard, Kohler, TOTO, WoodBridge, and Swiss Madison. Dual flush models are more expensive their single-flush peers, but they also are far more water-efficient. They are preferred by environmentally-conscious people, who think ahead.

Dual-flush toilets owe their name to the specific mechanism inside the tank. The button that is closer to you when you face the toilet releases about a third or so of the tank’s water content and it is, therefore, suitable for liquid waste. The bigger button releases 100% of the tank’s content and is used to flush down solid waste.

Types of Dual Flush Toilets

Depending on their design and mounting, these toilets fall into three main categories, as listed below.

One-Piece Toilets

This design offers a tank and a toilet bowl in a single unit. One-piece toilets are very suitable in small bathrooms. These units come in different heights, so what’s good for a grown-up individual may not be so comfortable for a kid. The one-piece design is free of nooks and crannies, so it’s very easy to clean. Its downside is that when something breaks, the repair can be time-consuming and costly.

Two-Piece Toilets

Two-piece dual flush toilets are the most popular toilets on the market. The tank is mounted over the toilet bowl behind the seat. This design allows for easy repairs and replacement of the tank. There is a small alley between the toilet seat cover and the tank that may trap urine, so make sure to keep it clean.

Wall-Mounted Toilets

This is the most beautiful and expensive design. It provides lots of space and comfort for the user, but at the same time occupies a larger portion of the bathroom. In addition, a wall-mounted toilet requires more preparatory plumbing, and it is therefore more expensive and time-consuming to install.

This is because the water tank is built in the wall and hidden behind some expensive tiles. If the tank ever malfunctions, you’ll have to break the tile work so as to access it. Then, when the repair is complete, you’ll have to reapply new tiles.

Best Dual Flush Toilets Top Picks

1. H2Option Dual Flush Right Height Elongated Toilet

This is the best dual flush toilet by American Standard. It has a standard 12-inch rough-in and a fully-glazed 2-inch trap-way. The toilet bowl has got a sanitary bar, and the rim stands at 16.5 inches from the ground, which makes this model a bit higher than a standard two-piece toilet.

American Standard claims this has been done with extra comfort in mind, but we aren’t sure if this makes it a toddler-friendly toilet. As seats are sold separately, we recommend that you buy a child-friendly top seat like this one.

The flush button is at the top of the tank, and the water usage of this dual flush elongated toilet is 0.92 gallon per half-flush, and 1.28 gallons for a full flush. Because of its low water consumption, this model has been tagged as a UHET, which stands for an Ultra High-Efficiency Toilet. This is one of the best toilets from Lowes that you can buy.

It’s made of solid china and features American Standard’s patented EverClean® surface. The best dual-flush toilet on our list has got a siphon jet bowl technology with PowerWash® rim does most of the cleaning work so that you’ll hardly need to use the brush.

Unless you drop a spanner into the toilet bowl, American Standard guarantees that their chinaware is going to last a lifetime. In addition, all mechanical parts are covered by a five-year warranty from American Standard. Still, some users have complained of the toilet’s flush button.

First, it’s made of plastic and may break after some time. Second, it tends to sometimes block in a lower position and cause the tank to overflow into the bowl. This is annoying because the faulty flush button causes the toilet to waste water instead of saving it.


  • Excellent build quality and design
  • Mechanical parts are covered by a five-year warranty
  • A lifetime warranty on the chinaware
  • Easy to clean and uses very little water


  • Issues with the flush button at the top of the tank have been reported
  • Original toilet seat is too large for kids

 2.Kohler K-3987-0 Wellworth

This is a round-front dual-flush toilet that is suitable for medium-sized bathrooms. The flush mechanism is activated with a two-position trip lever on the left side of the toilet bowl. Thus, you can use the top of the tank to put an extra roll of toilet paper, or a box of wet wipes. The half-flush spends 1.1 gallons of water, and the full-flush – 1.6 gallons.

 Kohler’s K-3987-0 Wellworth two-piece model features a glazed 2.13-inch trap-way. Keep this in mind, as it’s slightly above the two-inch standard. The twelve-inch rough-in is what you can find on any other model.

Designed and manufactured in the USA, this toilet is made of heavy-duty vitreous china. It is also very easy to install. When installing it, keep in mind that there isn’t a wax ring in the package, and neither is there a toilet seat.

Even without American Standard’s EverClean® surface, the toilet bowl becomes 100% solids-free after every flush. Besides, this toilet makes very little noise when flushing and filling. Kohler’s K-3987-0 is covered by a one-year limited warranty on the body and the movable parts.


  • Very affordable for a dual-flush toilet
  • 100% designed and made in the USA
  • Easy to assemble and install
  • Extra storage space at the top of the tank


  • Some users wish the flush was a bit more powerful
  • No wax ring in the start-up package
  • Some users have found the toilet bowl too high for a comfortable seat

3.WoodBridge T-0001

Making toilets and bathroom equipment since 2005, the California-based WoodBridge company is a manufacturer you can trust. T-0001 is the flagship of their wide selection of dual toilets. It impresses with a futuristic design that looks solid and durable as one of the best dual flush toilets.

WoodBridge T-0001 is a single-piece, elongated, dual-flush toilet that features the revolutionary WaterSense technology. This means that a half-flush spends just one gallon of water, while the full flush uses 1.6 gallons. This toilet uses a gravity-assisted siphon flushing system that is both quiet and water-efficient.

T-0001 is as high as a standard chair. This may make it easier for elderly individuals to use, but others may find it too high. The standard 12-inch rough-in is fully covered by a sleek white skirt, and so is the trap-way.

WoodBridge T-0001 is built to last for generations on end! The manufacturer gives a 5-year limited warranty on the porcelain body against fading and staining of the glaze. The flushing mechanism and the soft-closing toilet seat are covered by a one-year warranty.

The toiletarrives with a pre-installed soft closing toilet seat, water fitting (also pre-installed), and a wax ring. The whole unit is 120 lbs. heavy, and it is to be fixed to the floor with bolts that you’ll also find in the package. These are tightened with a special hand-wrench, whose shape allows efficient operation even in narrow and poorly-lit spaces.

The only downside of this toilet that we could notice is its relatively difficult installation. WoodBridge does have a friendly support team ready to answer your questions, and they’ve even included an installation video in the start-up package. Still, T-0001 may require some preliminary plumbing work. Our advice is to have this toilet installed by a qualified plumber.


  • Hefty and solid design
  • Manufactured in the USA out of top-quality materials
  • Very economical and eco-friendly
  • Quiet flushing mechanism and slow toilet seat lowering


  • Installing this toilet on your own may be a challenge
  • The toilet is very heavy and carrying it is a two-men job


TOTO AQUIA IV is a very economical dual flush toilet – the half-flush spends just 0.8 gallons of water, while the full-flush uses 1.28 gallons. This is below the average standard of 1.6 GPF. Many manufacturers boast that their dual flush models are easy to clean, but the guys from TOTO have developed the revolutionary DYNAMAX TORNADO FLUSH system that provides effective 360-degree cleaning of the ceramic toilet bowl with every flush.

It channels the water through the rim to wash away every nook and cranny of the bowl, and thus saves its owner up to 123 gallons of water per day. TOTO AQUIA IV is the best dual flush toilet in Washington, California, and Texas, as the users there can claim rebates on their water bills.

The rimless design of TOTO AQUIA IV keeps the whole bowl evenly clean and its special cover, the CEFIONTECT ceramic glaze, reduces water resistance to flush away more solid waste with less water. It also has got an ion-barrier that minimizes the accumulation of mold and debris.

 Despite its boisterous name, DYNAMAX TORNADO is a relatively quiet flushing system, while the toilet’s dimensions of 32 x 20 x 23.5 inches seat comfortably most users. It comes with a soft-close seat included in the package.

This model’s only downside is that the glaze requires frequent cleaning. Some users also wish the water level at the front of the trapway was a bit higher to prevent pungent odors from escaping into the bathroom. This is a two-piece floor-mounted toilet, so you’ll have to drill six holes into your bathroom’s floor to fix it.

Some users have also frowned at the absence of an installation guide in the unit’s package. Fortunately, TOTO’s customer support representatives are easy-to-reach and quite helpful.

On the plus side, TOTO AQUIA IV features an adjustable rough-in that can go from the standard 12 inches down to ten or up to fourteen inches with the help of special transition parts that are purchased additionally.


  • One of the most economical dual-flush models on the market
  • The DYNAMAX TORNADO FLUSH system provides 360-degree water dispersion
  • The CEFIONTECT ceramic glaze with an ion barrier prevents mold accumulation
  • Relatively quiet flush and fill-in
  • Adjustable rough-in
  • Soft-close seat included in the package


  • The glaze requires frequent cleaning
  • Installing the toilet properly may take some time

 5.Swiss Madison St. Tropez Dual Flush Toilet

This is a floor-mounted single-piece, dual-flush toilet with a slim tank and two chrome-plated actuator flush buttons. The half-flush function uses just 0.8 gallons of water, while the main button releases 1.28 gallons of water into the elongated bowl.

This significant water economy is achieved by the Dual Tornado Flush System for optimal water dispersion. The bowl itself features a seamless design, meaning that there is no edge under which germs and bacteria could cling and flourish.

The St Tropez model of Swiss Madison comes with a toilet seat included. This dual flush toilet is 16.5 inches high and has got a standard 12-inch rough-in and a glazed skirted trapway. The whole unit weighs 110 lbs and its dimensions are 26.5 x 15 x 31 inches.

A wax ring and four bolts are included in the package for easy installation of the toilet. Detailed installation instructions and diagrams can be downloaded from the manufacturer’s website. The patented Slymm™ seat features a soft-close quick-release mechanism, which facilitates the cleaning of the area between the tank and the toilet bowl.

The only downside of this toilet is that it’s covered by an only one-year limited warranty, which is not enough for such an expensive product.


  • Modern and solid design
  • The slim tank saves precious space in the bathroom
  • The standard chair’s height of the toilet bowl facilitates seating
  • Wax ring and soft-close seat included in the package
  • Easy to clean & very economical


  • Only one-year limited warranty
  • Some users wish the toilet was a bit quieter
  • Some defective models may leak at the base

6.Sheffield Corner Dual Flush Toilet

Renovators Supply Manufacturing has been making antique reproductions and modern bathroom equipment and toilets since 1975.

The toilet we’ve chosen to review is a two-piece, dual-flush model that is mounted to the floor in your bathroom’s corner. This is the best toilet to fit in tiny bathrooms, where every square inch matters. The integrated WaterSense Dual Flush technology makes the toilet extremely water-efficient – just 0.8/1.6 gallons per flush, respectively.

When you stand in front of the toilet, you’ll see that the tank has been moved slightly to the left so that the bowl can come as close to the wall as possible. The seat height is fifteen inches, and while this design does save space, it does not make the toilet comfortable to use.

The toilet is made of white vitreous china and features a standard 12-inch rough-in and an efficient push-button dual-flush mechanism. The manufacturer claims that this toilet saves up to 25,000 gallons of water a year. The unit is 31 inches tall, 18.5 inches wide, and projects 32.5 inches to the center of the bathroom. Its total weight is 82.7 lbs.

This gravity-assisted toilet is very suitable for big-city dwellers, who prioritize space over comfort. The start-up package does include a toilet seat, but the floor-fixing bolts must be purchased separately. The toilet seat’s no-slam mechanism lowers it quietly in place every time, while the Reno-Gloss finish protects it from scratches and stains.

The white porcelain finish of the bowl looks really classy and is very easy to clean. The downside of this model is that the bolts that hold the toilet’s base to the tank are made of plastic. We recommend that you replace them with metal ones. Users have also shared that sometimes the included lid does not fit the toilet.


  • Ergonomic space-saving design
  • The WaterSense Dual Flush technology maximizes water efficiency
  • No-slam mechanism on the toilet seat that lowers it slowly and quietly


  • This is a small toilet and some users may find it uncomfortable
  • Some installation parts aren’t included in the package
  • The bolts connecting the tank to the base are made of plastic

7.Swiss Madison SM-1T106 Concorde Square Toilet

This one-piece dual flush toilet has a modern and stylish look. It is made for big bathrooms where space is in abundance and decorations are ample. We’ve already talked about round and elongated dual-flush floor-mounted toilets, but with our seventh pick, we’d like to bring to your attention a square design.

The square shape of this model saves more space than the elongated toilets, but it’s nonetheless larger than the round design. Some users have complained, however, that the square toilet seat isn’t very comfortable to use.

The gravity-assisted Dual High-Performance flush system is very water-efficient. It uses 0.8 gpf in the ½ tank mode, and 1.28 gallons for a full flush. This dual-flush toilet comes with a soft-close, while the Quick-Release mechanism allows you to easily unlatch the seat from the bowl for more efficient cleaning.

Speaking of cleaning, the seamless glazed porcelain cover of the bowl makes it a an easy task. The bowl is 15.5 inches high, which makes it comfortable to use by adults and kids alike. This unit measures 27 x 14.25 x 30 inches and weighs in at 130 lbs.

A wax ring and floor-fixing bolts are also included in the box. As the case is with most of Swiss Madison’s dual-flush toilets, the installation of SM-1T106 may be a challenge.


  • SM-1T106 features a futuristic square design
  • This toilet is easy to clean and comes with a soft-close seat
  • A wax ring and floor-fixing bolts are also included in the start-up package
  • This is a very economical dual-flush toilet


  • Installation may be difficult
  • The square toilet seat may be uncomfortable for some users
  • Some users wish the toilet bowl was a bit higher

8. Convenient Height Dual Flush Toilet

The eighth spot on our list is for a manufacturer that makes extra-tall dual-flush toilets. Its name just couldn’t be more telling: Convenient Height.

There are many fans of the NBA around the world, and the guys who like watching volleyball are about as many. But have you ever asked yourself how a 6.7-feet-tall guy feels sitting on a fifteen-inch-high toilet bowl?

That’s where the team of Convenient Height come to the rescue. They have designed a dual-flush, two-piece toilet that is 20 inches high (21 inches with the toilet seat and the lid. This convenient height suits better not only tall individuals, but also ones with knee joint issues, for whom standing up from the toilet can be a torture.

Notwithstanding its extra-tall design, this dual-flush toilet has been approved by the U.S. Board of Registration of Plumbers, and its users can even claim a tax deduction as a medical expense.

Let’s look at some technical specifications now. The toilet is made of standard vitreous china and has got a standard 12-inch rough-in. The gravity-assisted dual-flush system is very economical: 1.28 GPF for solids, 0.9 GPF for liquid.

The flush mechanism is handle-activated. The handle operates a throttle cable that in turn moves an inflexible inner wire to-and-fro, while the rigid outer sheath remains static. For a handle-operated flush system, this one provides a mighty flush. However, users have said it is accompanied by a loud gurgle.

When unboxing the unit, you can expect to find a slow-close toilet seat that is of average quality. There is also the dual-flush system with a flush valve and a fill valve that has to be installed inside the tank. The metal handle is fixed into a square opening on the side of the the tank by means of a back-nut.  Finally, there are some tank-to-bowl connecting bolts, as well as floor-mounting bolts.

The downside of this toilet is that because of its extra-tall size, it requires perfect leveling of the floor. And as this is rarely the case with bathroom floors, make sure that your plumber uses a high-quality flange and a real shim kit.

Because the unit is twenty inches tall, you’ll surely need an extended fill pipe or hose for proper installation. Last but not least, this toilet must only be installed by a professional plumber.


  • Extra-tall design suitable for tall individuals and ones with disabilities
  • Delivers a powerful flush with very little water
  • High-quality build and a three-year warranty on the whole unit
  • Comes with a soft-close lid


  • Not for mass use
  • Must be installed by a professional plumber which can be costly
  • The powerful flush is accompanied by a loud gurgle

Buying Guide

Here are some basic things to keep in mind when choosing a dual flush toilet.

Shape and size

Round toilets are generally smaller, but more difficult to find nowadays. The elongated toilet bowl design is far more popular. Round seats are between three and six inches narrower than their elongated cousins.

Round toilets are about two inches shorter than the elongated ones. There’s an in-between version called a Hybrid dual flush toilet. Its bowl has a compact oval shape that saves space without compromising on the user’s comfort. The square designs look futuristic, but aren’t very comfortable to use.

Flushing mechanism

To maximize water efficiency, all dual flush toilets use a siphon system rather than a flap valve. Most models feature the standard gravity-assisted flush system, which is the best for home use. Pressure-assisted dual-flush toilets use even less water but are far noisier. They are mostly installed in RVs.

Material and build quality

Almost all toilets made of vitreous china. Manufacturers such as American Standard offer the best build quality and durability. The less plastic parts are there on the toilet you want to buy, the better!

Water consumption

The standard water consumption of dual flush toilets is about 1.6 gallons per full flush. The pricier models tend to be a bit more economical, using 0.8 and 1.28 gallons per flush. We encourage you to check out some of the most economical toilets at Lowes.

Ease of use

We recommend that you buy a toilet with a top-mounted flush button. The ones using a lever to flush the water are not so easy to use and the lever may break after some time. The button may start to jam in a low position, though. Anyway, you’d better choose a dual flush toilet that you can install on your own.


All dual flush toilets are covered by at least a year-long warranty. We advise you to look for models that feature a lifelong warranty on the porcelain bowl and a five-year warranty on the movable parts.


What does a dual flush toilet mean?

As the name suggests, a dual-flush toilet features two flushing modes: full-flush and half-flush. The former empties the whole tank and is more powerful, while the latter uses half of the water in the tank or less.

Which is better dual flush or single flush?

Obviously, dual flush toilets are better than their single flush counterparts for more than one reason. They are more water-efficient and easier to clean. And namely because they use less water per flush, they save you money.

Are dual flush toilets worth it?

For a partial flush, these toilets use about half a gallon of water. A full- flush spends between 1.3 and 1.6 gallons of water, compared to the 3.5 gallons used by a single-flush toilet. The best dual flush toilets are paying themselves off with every flush.


Thanks for reading our comprehensive guide to the best dual flush toilets. As you may have noticed, these models have almost outplaced the outdated single-flush units. Economical and easy to clean, dual-flush toilets offer the comfort and security that one needs their bathroom.

We’d love to hear your comments and suggestions. If you like what you’ve just read, you can share it with your friends on Facebook, Twitter, or Instagram!

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