Dual flush toilets are ideal for people who want to reduce their environmental footprint without sacrificing their household hygiene and convenience.
But to serve that purpose, you need to purchase the right dual flush toilet. Lower quality models might force you to flush twice or even three times. Not only is that annoying—but multiple flushes more or less negate the entire purpose of a water saving toilet.
Since your ideal toilet will serve you for years to come, it’s important that you choose a well-made commode that looks good in your bathroom.
We’ve compared many of the most popular models in order to help you determine which is the right choice for your home. We compared design, build, water usage, price and size, as well as the long-term reliability of each toilet. Here are our top three favorite dual flush toilets.
Why switch to a dual-flush toilet?
This style of toilet is one of the most popular formats among people who are trying to reduce water usage. Think about how many times you go to the bathroom in a day, especially if you’re drinking as much water as you should. Each time you make a bathroom trip just to pee, you’re wasting water if you use the same flush as when you’re taking a Number Two trip. So, these thrones give you two options to choose from, so you can decide how much water you actually need on a given trip.
Usually they feature two buttons on the top of the tank, one for liquid waste and one for solid. The first button releases a reduced volume of water for liquids, and the second releases a larger volume to flush solids, which is more like a conventional fixture. The liquid function can save 50% or more of the water you’d use with the solid function! Over the course of the day, that really adds up. You’re conserving water without actually compromising on sanitation or convenience.
Dual flush toilets aren’t just good for the environment—they’re good for your wallet, too. By saving water every time you flush liquid waste, you can significantly reduce your water bill. After a few years of use, the dual flush toilet can pay for itself–especially if you use a municipal water supply.
Best Dual Flush Toilet Reviews
Top Pick: American Standard H2Option
The top choice on our list is also the highest-rated and best-selling model on Amazon. The American Standard H2Option has impressed the majority of reviewers, who praise the toilet’s combination of water-saving ability and flushing power.
The H2Option releases 1 gallon per flush for their light flush, and 1.6 gallons for the heavy. The dual flush function is controlled by two silver buttons on top of the tank.
It uses American Standard’s patent-pending siphonic technology to add an extra boost to the limited amount of water it uses. This includes a jet-powered stream and a pressurized rim, which discharges water into the toilet from tiny holes to effectively power-wash the bowl when you flush.
In appearance, the American Standard has a pleasant design—not so intrusive that it demands attention, but attractive enough to complement your decor. The finish is American Standard’s EverClean glaze, which keeps the toilet shiny and clean, while preventing bacterial growth.
The seat height is an ADA-compliant 17”. The H2Option comes in two models, one with a round front and the other with an elongated bowl (which is slightly more expensive).
Owners are deeply impressed with the flushing power of the H2Option, which flushes solids cleanly and quietly with a single press of a button. They said that in addition to handling all its human duties easily, it was also ready and able to take care of flushable cat litter in one go, which was much better than older models they had used. They also complimented the quietness of the flush, which belies its strength.
You don’t have to take anyone’s word for it, though.You can see this power flush with your own eyes in a demo video from American Standard. The H2Option effortlessly flushes 20 golf balls the demonstrators pour into the bowl, as well as many other objects that shouldn’t go in toilets.
The H2Option seems to stand the test of time, as well, with a number of owners noting that it had been years since they have needed to unclog their toilet.
The combination of Everclean surface and flushing power also has proved an asset to owners, who have to clean the unit far less than the other toilets in their home. The H2Option is a smaller-sized unit, which makes it a good choice for bathrooms with limited space, or families with children.
It’s also designed to be easy to set up in your home per the included instructions. This is a great help if you’re ordering a toilet off the Internet, and will save you the cost of hiring a contractor.
The reviewers were largely positive, with most users only taking minor issue with certain design elements of the H2Option.
For example, a few owners noted that the smaller tank meant that the top of the toilet didn’t reach the wall. Without the wall support, the top of the tank rocked back and forth, knocking against the wall.
Additionally, the smaller size of the whole toilet may be good for families with children and/or limited space, but it can be troublesome for tall people. Senior citizens may also find smaller toilets to be rough on the back and joints.
With a reasonable price, attractive design, and great internal mechanism, the American Standard H2Option only stands to the quality of your home. It’s our top choice for dual flush toilets. It works well, flushes once, and seems to stand the test of time.
The H2Option seems to be a good choice for most consumers’ needs. However, if you have joint, back or hamstring problems (and you plan to use this toilet as the main toilet in your home) you may want to consider some toilets with a taller seat height.
Second Pick: Toto Aquia II
The Toto Aquia II is another model worth consideration for dual flush toilet shoppers. The sleek and compact design gives it a unique appearance that would complement bathrooms with a more modern interior design scheme.
The Aquia II features a skirted bottom, which eliminates the nooks and crannies of more traditional toilets and makes cleaning a breeze. It also comes in several different colors to pair better with your specific bathroom decor.
Like the H2Option, the Aquia II also features two chrome buttons on the top of the tank to control water volume per flush. The heavy flush is 1.6 gallons, and the lighter flush is .9 gallons.
Toto doesn’t offer as much of a description of the mechanics behind their flushing power, but the vast majority of users say that it empties the bowl perfectly each time. Like the American Standard model, the Aqua II rates high in terms of performance.
The Aquia II also has many long-term owners who assert this model stands the test of time. One review (from January 2012) stated that after two years, the toilet hadn’t been clogged a single time. They said that was pretty impressive for a 3-person home that saw plenty of overnight guests. We found that lots of buyers who started with one Aquia II ended up replacing all their toilets with these, since they’re so easy to maintain.
The Aquia II, like the H2Option has a small size, but the elongated skirted design of the Aquia has a smaller footprint.
The primary reason that Aquia II came in second to the H2Option is the price. Currently, the Aquia II has a few more negative reviews that the H2Option and retails for a significantly higher cost.
The Aquia II has also more negative comments regarding performance, although the majority rated performance very high. This discrepancy could be due to the fact that installation isn’t quite as easy as the H2Option. Some users asserted that setting up the toilet was a breeze, but a few found installation to be a challenge—even for hired contractors.
Addition, the Aquia has a 15.5” bowl height, which is lower than ADA standards. Thus, people with physical issues (i.e. back pain, joint pain, etc.) and very tall people may find this Toto unit difficult to use.
Another minor issue: many users noted that the flushing buttons have a bit of a learning curve. They have to be held down for up to 5 seconds to perform a full flush. This isn’t necessarily a dealbreaker for most, but some arthritic users may find long-term use painful.
The Aquia II is a great-looking toilet with performance to match. Its second place status is mostly a result of the higher price and difficult installation.
However, you may choose the Aquia if you’re looking for a more modern or compact design than the H2Option. The vast majority of buyers have been pleased with their purchase—you probably will be, too.
Third Pick: KOHLER K-3987-0 Wellworth
The Kohler Wellworth has a unique, slim and attractive design with a sturdy build that many prospective customers will find appealing. It also comes in three different finishes and eight different colors, ready to pair with any bathroom design.
Another standout feature is flushing mechanism, which is controlled by a two-part lever instead of a button. The longer green colored lever is used to control the 1.1 gallon flush for liquid waste, while the whole lever releases the higher volume 1.6 gallon flush.
The Kohler also uses a siphoning/jet combination for added flushing power to compensate for less water. The Wellworth product page boasts that it can handle up to four times the amount of waste the average adult needs.
The lever design is a particularly appealing feature. As mentioned above, the button system of the other two toilets we mention here can have a bit of a learning curve, and can be rough on arthritic fingers. The Wellworth design is more intuitive, and leaves the top of the tank free for things like tissues, potpourri and candles. It still gives you two flush options, though, so you can be sure you’re saving water with each flush.
Users also noted that installation was very easy, and many mentioned that their Wellworth never clogged. As with the other models we’ve looked at here, Wellworth users said they hadn’t had to plunge their toilets in ages.
The major complaint among reviewers seemed to be the height of the toilet, which many claimed was a little too short for comfort—particularly for the elderly and tall people.
The top of the bowl is 14.5” off the floor, and the final height of the seat will depend on the thickness of the toilet seat you use (most will add an extra inch). However, this may be a benefit for shorter families or families with children.
Another possible issue is the clog-free design. The large, rectangular opening of the Wellworth can be great for preventing most clogging incidents. But even the best toilets can clog unexpectedly.
Ironically, if the unit does clog, a standard plunger won’t be able to unclog it. Users may have to purchase a wider plunger to prevent future disasters.
Another reason the Wellworth scored lower is that, at the moment, it has far fewer reviews than the other two toilets mentioned here, and no mention of long-term uses. As this model only comes with a 1-year warranty, we’re hesitant to recommend a model that hasn’t been reviewed for long-term use.
The Wellworth seems like an excellent toilet for the price—slightly more expensive than the American Standard, but less expensive than the Toto (at the time of this writing).
The Wellworth is another great option, and nearly every reviewer seems very pleased with the product. The two-part lever is an excellent design choice, and for many people, this may be the selling point—particularly individuals who suffer from arthritis in their hands.
There’s no significant mechanical problems with this toilet, and the build is sturdy and reliable. Its height, however, may prove problematic for tall or elderly users.
|American Standard H2Option||$$||1 - 1.6 gallons||17"||5.0|
|Toto Aquia II||$$$||0.9-1.6 gallons||15.5"||4.0|
|KOHLER K-3987-0 Wellworth||$$$||1.1-1.6 gallons||14.5"||4.2|
What should you think about when you’re deciding between these fixtures?
- looks: think about which of these would match your bathroom decor, and your personal style!
- dimensions: make sure your new throne is at a comfortable height for you and your family!
- warranty coverage: get covered for the long term, so you don’t have to worry about replacements!
- water usage: check the actual flow rates on our models, and see how much of a savings you can make!
- flushing mechanism: find something that works best for you, traditional or modern!
All three models mentioned here will be a great addition to any household. All will help you reduce your water bill and reduce your home’s ecological impact.
The one you choose will likely come down to your personal aesthetic tastes, and your ideal design theme for your bathroom:
The classic and powerful American Standard H2Option is our overall favorite for its flushing power and time-tested quality. We think it’s a good purchase for just about everybody.
The Toto Aquia II, on the other hand, is a more modern, streamlined design—which might be better suited to your decor if you’re into minimalism or modernism!
Are you more of a traditionalist? In that case, you may be interested in the Kohler Wellworth, with its sturdy design and unique lever operation. It’s a nice way to conserve water but keep a classic look and feel.
Looking for a slightly taller set of toilets? Check out our One-Piece reviews—all ADA-approved. Interested in reducing your household water usage even more? Take a look through our Best Low Flow Toilets, or Best Composting Toilet reviews. Visit our article on the Best Toilet Reviews.