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Best Dual Flush Toilets 2024

The top toilets with a dual flush tend to operate on a mechanism that utilizes two buttons to send two differing water power levels through the bowl. Primarily, this is to grant people a choice for both liquid and solid waste. It enables users to utilize a more efficient waste removal method for liquid waste, by doing so saving thousands of gallons of water per year in the household.

After spending several hours looking through the various products on the market, analyzing their spec list along with consumer feedback, I have put together a small list of units that in my opinion are among the best the industry has to offer.

Our ratings

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Our reviews are designed to give our readers an unbiased opinion on a toilets main features. We have researched several of the highest rated units and looked into important specs such as gallons used with each flush, bowl style, dimensions, and much more. All this is aimed at giving people a helpful insight of what to expect before they buy.

American Standard 2886218.020 H2Option

The 2886218.020 could be a welcome addition to those working with a medium budget. Not overly expensive, contains some nice features, and made by a reputable brand.

It's got a two piece design, meaning the tank and bowl need to be attached to one another. A white color isn't particularly unique, but it's a color I would certainly choose over many other options out there, simply because it's so versatile at matching different themes.

Called the H2Options thanks to the two power levels that are operated via usage of button actuators on top of its tank lid. The lower flow will produce 0.92 gallons, whilst the stronger will send 1.28 gallons through the bowl. This means both fit WaterSense standards, which can enable people to make savings of around twenty percent compared to federal standard of 1.6.

The bowl features something known as EverClean surface, which is an effective way to ward off things such as odors, mold, and stains. Those of you who set high standards of hygiene for the bathroom, will appreciate this.

TOTO CST412MF.01 Aquia

By spending time studying and researching products, we've come across several of the best rated TOTO toilets on the market. In my opinion, the CST412MF.01 model is another that fully deserves 2nd place on my list.

It's a two piece model, featuring an elongated bowl shape, and comes in white. Although, you do have the choice to switch to Ebony and Beige with the .51 and .12 models respectively.

It's not the most efficient unit out there, with the two power levels operating on 0.9 GPF and 1.6, with the lower of the two allowing people to make savings on liquid waste, but the higher more inline with the standard usage.

A universal height bowl is taller and generally speaking, will be a more sensible option for households that have infirm or elderly family members.

After looking around the web on various shops for consumer feedback, we've found lots of positive comments from buyers. Which is great when you think about it being in the mid tier budget range.

KOHLER 3989-RA-0 Highline

After analyzing several products through our KOHLER toilet reviews page, the 3989-RA-0 from the Highline range stood out as a main contender with a double flush.

It's equipped with what's known as class five performance in waste removal power, utilizing between 1.1 and 1.6 gallons of water.

Those of you wanting to have extra storage space in your bathroom, may appreciate that the lever is found on the side of its tank rather than the top. This leaves a the flat lid free to place items such as magazines.

Warranty wise, this model includes limited coverage for one year, which will help in the event that something goes wrong.

Overall, a good balance between price and functionality allowed this unit to finish 3rd.


Again, the TB309 is a two button toilet. One button handles pushing lighter liquid waste through the bowl using 0.8 GPF, whilst the other button will push 1.6 gallons through for solid waste. Both of these buttons mentioned are found on top of its lid, which is a slight disadvantage in our view compared to ones found at the side of the tank as it needlessly takes up space that could be used for a different purpose.

However, I feel that it redeems itself with a variety of features, especially the fact that this comes with a soft closing toilet seat and lid. We all know that seats slamming shut in the middle of the night can be irritating to others asleep in your household, which is why it's becoming more and more sought after.

The surface area of water in the bowl is deliberately wider than plenty of standard models. This is to help keep odors to a minimum, and make light work of any maintenance jobs being undertaken.

It's floor mounted, and has what I feel is quite a contemporary, white porcelain design. If you're a fan of one piece products, this could be exactly what you've been looking for.

Comparison table

American Standard 2886218.020 TOTO CST412MF.01 KOHLER 3989-RA-0 EAGO TB309
Type Two piece Two piece Two piece One piece
GPF 1.28 1.6 1.6 1.6
Bowl Elongated Elongated Elongated Elongated
Comfort height
Color White White White White
Dimensions 15 x 29.8 x 31.5" 27.5 x 14.2 x 31.2" 29.8 x 18 x 31.2" 28.4 x 16 x 30.8"
Weight 72.3 lbs 110 lbs 90.8 lbs 98 lbs
Rating 88% 88% 87% 87%

How do double flush toilets work?

The mechanism behind a Dual flush loo is simple enough to understand. But how does it all work?

The first thing to realize is that they are very much similar to standard products, but have some key differences. For example, they tend to have a larger trapway and consume lesss water.

They usually operate on a wash down mechanism rather than siphonic, which helps prevent blockages from occuring. The whole idea behind them is to give people an option to deal with liquid and solid waste differently, making them both more economically and environmentally friendly.

Considerations before you buy

Pre purchase considerations are very important as they will ultimately help prevent buyers remorse. The information below should be understood before you go shopping to reduce the chances of needing to send your items back to the shop.

What's your rough in size? - Make sure you have a measuring tape on hand to find out the rough in size you will be looking for. Our guide above demonstrates how to measure it.

Bowl shape and height - When compiling a list of contenders, make sure you know what sort of footprint you're dealing with. Toilets will come in all shapes and sizes, some being taller, others more compact, whilst several manufacturers focus on user comfort whilst seated. The point being, understand your bathroom requirements, how big the room is, and if you've got anyone that lives there with specific access requirements, for example the a senior citizen.

Water consumption - If conserving water is something on your mind, you will find plenty of options that offer a WaterSense labelled, often found between 0.8 and 1.28 gpf, which is dependant on usage of both the heavier or lighter flush.

Outlet - The waste outlet location is basically split between two locations. The most frequently found being the ones with waste passing through the floor. However, you may find several units that provide rear discharge. Again, this will all come down to what sort of system you currently have in place. If you're not sure, it may be a sensible idea to hire a plumber to come and tell you.

Mount type - Typically you'll see plenty of floor mounted options, and these are definitely the most common. However, this flushing system is not just limited to those mounted to the floor. In fact, there are several great wall hung toilets that do too.

Budget - The price you're willing to pay plays a large role in the quality of a product naturally. However, there are three budget ranges that stand out for us. Under 150 dollars will land you a lower quality model, but the basic functionality is usually there. Below 400 dollars tends to be the right mix for finding the balance between performance and value. Anything above this range, especially over 500, are usually from more luxury ranges with better technology. Choosing and sticking with one of these three that best meets your needs is in our view a smart move.

Design - Taking time to find the right style and fit in terms of color and shape should certainly be on your list of priorities. Small, yet effective changes to the layout of a bathroom can make a huge difference in how the room as a whole looks.

Wrapping up

Our two flush toilet reviews can be used in your search for the right fit for your homes needs. By delving deep into their specifications, we've been able to highlight some of the positives and negatives of individual units. We've also used consumer feedback to our advantage for filtering out some of lower quality products.

By taking time and doing your due dilligence, you can find a good match for your needs utilizing this article as a buying guide. By making sure you follow the tips and advice above, you will be less likely to make mistakes. Especially considering all the terminology used by various manufacturers, which can get confusing.