What is a Dual Flush Toilet, How it Works, Parts & Best Review

If you’re looking for ways to improve your bathroom experience while conserving some water, trying out a dual flush toilet is an idea worth considering.

With a dual flushing mechanism, you have an option to choose the amount of water you want to let into the bowl for each flush. This allows you to use a lesser amount for liquid waste and more for solid waste.

Following are details on what exactly a double flush toilet is, how it works, its various parts, benefits, and a review of the best picks in the market.

Dual Flush Toilet Meaning & Parts

A dual-flush toilet is a flush toilet with two buttons or a handle mechanism that flushes varying volumes of water. A smaller amount of water is used to flush liquid waste, while a larger amount of water is used to flush solid waste.

Dual flush toilets are named after the two (dual) setting mechanisms that power them. This two-setting mechanism is typically a button or a lever on the toilet that allows you to flush a small or large volume of water.

Low volume flushes are intended to flush liquid waste, whereas high volume flushes are intended to flush solid waste. Unlike standard toilets, which have only one flushing option, dual flush toilets have a low volume flush that allows for water conservation when using the liquid waste setting.

Parts of a Dual Flush Toilet

The main parts of a dual flush system include the dual flush valve and the pushbuttons/handle.

Dual flush system picture
Dual flush system
Parts of a dual flush toilet diagram
Dual flush parts: Image:masterplumber.ca

How does a Dual Flush Toilet Work?

Dual-flush toilets have a complex mechanism that allows two distinct amounts of water to be delivered into the bowl when the toilet is flushed and depends on gravity to remove waste from the bowl.

Dual flush toilets have varied operating mechanisms depending on the brand and company that makes them, but the premise is the same: they all save water by using the same concept.

Most brands of dual-flush toilets have two flush buttons located on the cistern’s top, normally one small and the other bigger.

The smaller of the two push-button flushers engages the “half flush” option, releasing only a percentage of the water in the tank, which is typically around 3 liters.

 The larger button initiates the “full flush” option, which means that it releases all of the water in the tank, which is usually around 6 liters.

This is not the case with a single flush toilet. Every flush of a single-flush toilet releases all of the water in the tank.

Dual-flush toilets with classic flush handles are also available. The handle is often raised for a half flush and pulled down for a full flush, however, this varies by model.

Dual flush buttons types
Buttons and handles

Regardless of brand differences in functioning processes, most dual-flush systems will feature some form of iconography on or near the flushing mechanism to show which choice is for liquid waste and which is for solid waste, making it easy to use.

To make it easier for waste to be flushed out, dual flush toilets have a 10cm trapway. In comparison to regular toilets, they save a lot of water because they only keep a small amount of water in the bowl at any given time.

Best Dual Flush Toilets Review

Following is a review of the top dual flush toilets you can buy today

Kohler Wellworth Dual Flush Toilet-Two-piece, Round

Kohler Wellworth
Kohler dual flush

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Because of its cost-effective approach to the dual flush market, Kohler’s K-3987-0 dual flush toilet is our top choice in terms for value for money. This toilet has all of the excellent attributes of the most different brands of toilets but at a lower price point that may be more appealing to some purchasers.

This toilet is a two-piece design that is created with compact areas in mind. If you have a small bathroom, a round-front bowl toilet works perfectly.

With its Class Five flushing technology, you are assured of plug-free performance and powerful rinsing that keeps your bowl ever clean. This is especially useful for large-scale bulk flushing. As a result, you won’t have to use a plunger any longer.

The Wellworth double flush incorporates a canister flush valve, which boosts power and efficiency by enabling water to come in from all sides of the valve.

Instead of buttons on the top, it comes with a left-hand nested trip lever that offers a choice of 1.1 or 1.6 Gallons per flush. For those of us who have always used a side-flush toilet, this makes flushing more intuitive.

It has 2 1/8 Inch glazed trap way comes in white, black, and biscuit colors.

American Standard H2Option Dual Flush Toilet Elongated Right Height

American Standard Dual Flush
H2Option

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In terms of comfort, the American standard H2Option dual flush toilet is the best. With a 16½” rim height, the H2Option toilet sits higher off the floor than standard height toilets for unbeatable comfort.

Its siphon jet bowl technology with PowerWash rim provides optimal UHET performance for strong flush and consistently clean bowl. The main engine that drives the PowerWash rim and siphon jet channel is the tower flush valve. Unlike the flapper valve, it permits more water to flow down the bowl quicker through the glazed water channels.

The EverClean exterior on American Standard toilets ensures that they stay as clean as possible for as long as possible. The super-smooth EverClean glaze prevents waste from clinging stubbornly on the bowl surface, making it easy for the PowerWash to sweep everything down into the bowl outlet

Chrome plated top mounted push button actuator(0.92/1.28 gpf) for maximum water savings.

The American standard dual flush toilet comes in three hues to complement your bathroom’s decor.

Though it costs slightly higher, it is popular and recommended because of its high efficiency, ease of use and comfort.

TOTO Dual Flush Two-Piece Elongated Toilet (WASHLET+ Aquia IV)

Toto dual flush toilet
Aquia IV Washlet+

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The TOTO WASHLET+ Aquia IV is an elongated two-Piece toilet that incorporates CEFIONTECT, EWATER+, and DYNAMAX TORNADO FLUSH technologies which together create a synergy that optimizes flush performance to reduce the frequency of toilet cleanings, minimizing the use of water, harsh chemicals, and time required for cleaning.

While the dynamax tornado flush uses a 360-degree cleaning power to reach every part of the bowl, the cefiontect, a layer of exceptionally smooth glaze, prevents particles from adhering to the ceramic.

The chrome center-mounted push button on top of the tank allows you to effectively conserve water by choosing between a 0.8 GPF rinse or 1.28 GPF for solid waste.

Skirted design minimizes the need to reach behind the bowl to clean the nooks and crannies of the exterior trapway.

The redesigned lid style resides flush with the toilet bowl, providing a streamlined look and giving the impression of an integrated system.

The contemporary WASHLET S500e Bidet Seat it comes with conceals the WASHLET power cord and water supply hose for a seamless installation. The WASHLET features TOTO’s technologically advanced EWATER+ system which uses electrolyzed water generated by a technologically advanced process, transforming the water into a safe and powerful compound.

 By misting the bowl after every use, the EWATER+ technology helps to keep your toilet bowl hygienic with no extra harsh chemicals.

The PREMIST function sprays the bowl before each use to prevent waste buildup, keeping the bowl clean.

Other features

  • The lid comes standard with this toilet and features the soft-close lid mechanism found on nearly all high-end toilets.
  • Toto offers two height options when purchasing this toilet: standard 15 inches and universal 16 1/8 inches.
  • Minimalistic display that provides a more subdued appearance to your WASHLET.
  • WASHLET S500e is operated by a luxury style illuminated touchpad remote with 2 user memory to save the preferred settings.
  • The WASHLET features 5 spray settings, heated seat, and instantaneous water heating.
  • The enhanced design of the Aquia IV inner bowl reduces water flow resistance and turbulence, resulting in a quieter flush.
  •  The Aquia IV comes ready for install into a 12″ rough-in, but may be adapted for a 10″ or 14″ rough-in with the purchase of a separately sold adapter.

Glacier Bay Dual Flush Toilet 1-piece

It’s easy to understand why the Glacier Bay 1-Piece High-Efficiency Dual Flush Elongated All-in-One Toilet is the greatest one-piece dual flush toilet on the market. The fact that it is so compact for an elongated model is one of the main reasons it is one of the best. If you have a tiny area but still want to be comfortable, this model is a good choice. You’ll appreciate the toilet’s stability and sleek appearance even if you have plenty of room.

Glacier Bay Dual flush toilet
Glacier Bay

It’s mostly made of white vitreous china that resists fading, cracking, and abrasions. A refined design with gentle, smooth curves complements any bathroom while remaining robust. The tank also boasts a low profile and a one-piece design that makes it easy to put on and take off.

The top-mounted push button has two efficient flush settings.: 1.1 gpf for liquid flushes and 1.6 GPF for full flushes. The 1.1 gpf meets WaterSense requirements, saving over 20% water per flush, which is rather outstanding. The 16.5-inch height of the bowl conforms with the ADA’s accessibility criteria. This is a good alternative if you’re taller or find that lower bowls strain your back and knees.

Finally, the Glacier Bay 1-piece toilet comes with a limited lifetime warranty, ensuring that it will not fail you down. At the low price it is listed at, it is easily positioned as the best.

WOODBRIDGE T-0019 Dual Flush Elongated Toilet

Woodbridge has thought about the design of your bathroom with its one-piece dual flush toilet. It features smooth edges that look wonderful and make cleaning much easier than toilets with curves. They’ve even thought about how high the toilet is. To make it easier for the average adult to get on and off, the seat has been enlarged, making it longer and taller, chair height.

Woodbridge Dual Flush Toilet
Woodbrige T-0019

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This elongated toilet is ranked top because of its siphon flushing system, which allows it to flush quickly and quietly, the soft-close toilet seat, and the high efficiency WaterSense Certification it obtained. They have toilet amenities that are naturally compatible, such as a bidet that can be attached.

WOODBRIDGE T-0019 Dual Flush Elongated Toilet is considered as one of the best dual toilets and has high efficiency too. 

DeerValley DV-1F026 Dual Flush Elongated Standard One Piece Toilet

DeerValley Toilet
DV-1F026

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The DeerValley DV-1F026 is an an easy to clean and install especially for small spaces.

Its siphon flushing allows you to proactively conserve water by selecting 0.8 GPF or higher(1.28gpf) for tougher jobs

Elongated one-piece toilet skirted design and glazed in surface simplifies cleaning and maintenance

It has a modern design. Sleek ADA height design which is stylish, terrific lines perfectly suitable for your modern design bathroom.

Other features

  • Dual flush toilet fully glazed flush,
  • Super-quiet and powerful flush with no clogs.
  • Leak-proof.
  • It is easy to install.

Swiss Madison Well Made Forever SM-1T254 St. Tropez One Piece Toilet

If you are looking for not only a modern design but also a sleek look that will complement different bathroom styles, the St. Tropez one-piece is the perfect choice.

Swiss Madison Dual Flush
St. Tropez dual flush

Dual flush allows you to choose between partial and full (.8/1.28) flush, which allows you to be fiscally and environmentally conscious without sacrificing performance.

Other features

  • Fully skirted trapway that gives it an appealing seamless modern design which is extremely easy to clean.
  • The elongated and comfort height bowl adds more comfort.
  • Quick-release matte chrome hinges allows the seat to be unlatched from the toilet for easy removal and convenient cleaning, no tools required.
  • Comes with a soft closing seat.
  • Special holes to reach the bolts – includes bolt caps and wax ring

Are Dual Flush Toilets worth it? What are the Pros?

Dual Flush Saves Water.

The most significant benefit of a dual flush toilet is that it conserves water. How do dual flush toilets save water? Dual flush toilets allow you to select between a full or half flush can cut toilet water use by 60 to 80 percent without reducing performance.

It is cost-effective.

If you utilize a dual flush toilet, you will undoubtedly save money as a result of conserving water. Consider this: your water bill is based on the number of liters you use on a monthly or annual basis. As a result, adding a dual flush toilet to your already established shallow baths and quicker shower regimen will save you money.

Dual Flush Toilets Clog Less

Dual flush toilets are less likely to clog. This is because they employ gravity to help with waste collection and are built with a huge trap-way to make this process more efficient. As a result, you’ll have less blockages than you would if you had a standard toilet.

Instead of using old-fashioned pressure siphoning, most dual flush toilets use gravity to evacuate waste through a huge trapway. The trapway’s size has an added benefit: it minimizes the likelihood of clogging.

Dual Flush Toilets are aesthetic and Stylish

Many dual flush toilet types offer a sleek, modern design that goes with a variety of bathroom decor choices. They are available in one-piece and two-piece variants, in white, black, and occasionally other colors.

Dual Flush Toilets Have A Powerful Flush

Dual flush toilets aren’t simply stylish; high-efficiency ones can flush relatively bigger amounts of solid waste compared to other toilets. Some reviewers say they only use the low flush option on some models.

What to Consider when Choosing Double Flush Toilets

It can be difficult to decide on a new toilet for your bathroom. With so many options, configurations, and styles to choose from, you’ll want to be sure you acquire the right toilet for your needs.

In addition to whether the toilet is wall-mounted, one-piece, or two-piece, there are several other factors to consider when selecting a dual flush toilet. The following are some of the considerations you should make:

Size and Shape

Round or elongated bowls are available with dual flush toilets. Round bowls are more compact (1 to 3 inches) and less expensive than their elongated counterparts. Because round toilets are compact, they can fit into smaller bathrooms and take up less floor area. To meet the Americans with Disabilities Act (ADA) guidelines, most building codes require 21 inches of floor space in front of the toilet. You may need a smaller round bowl toilet to meet this code.

Elongated toilets are slightly more expensive than round toilet seats, but they are typically considered to be more pleasant. Elongated toilets are the most popular because of their higher level of comfort, which is why they’re usually advised for bathrooms with enough space.

Water usage

Despite the fact that all dual flush toilets are designed to save water by giving the low volume or high volume flush option, the amount of water required to flush both may differ from brand to brand due to different manufacturing companies. Thus, you would prefer for a toilet that uses the least amount of water possible without cutting or compromising on performance.

Comfort

While longer elongated toilets are frequently regarded to be the most comfortable, comfort is also determined by height. The distance between the toilet’s floor and the rim is roughly   14½ inches in a standard-sized toilet. If you’re of average or somewhat shorter stature, this might work, and it usually does for children. If you are exceptionally tall, disabled, or otherwise limited in your movement, a taller toilet may be preferred.

A toilet height of 17 to 19 inches, often known as comfort height, is meant for taller people and those with limited mobility because it needs less squatting and knee bending. Because it is easier for persons who have trouble standing from a low posture, comfort height is also known as standing height.

Flush Buttons/Levers

The flushing mechanism may be buttons or a handle lever and the placement and makes differs from brand to brand. Push buttons are easier to operate compared handles but this differ depending on what you’re used to. Consider one that is more convenient for you.

Material

Porcelain is the most common material used in the production of toilets. This is because porcelain is sturdy, has a watertight seal, and is relatively inexpensive to produce.

Plastic toilets, on the other hand, are rather uncommon due to the difficulties in making a plastic with the same quality as porcelain

Warranty

Your toilet may become damaged, malfunction, and require repair, or it may no longer satisfy you, prompting you to consider replacing it before it has served you for a long time. To take advantage of the warranty privilege, you should purchase your toilet from a company that offers a long warranty period.

Dual Flush or Single Flush Toilet?-Which is Better?

The major difference is that a dual flush provides two flushing options, both half and full, while a single flush offers a full only. This means that single flush systems use more water than dual flush systems.

Most single flush systems are cheap and easier to operate and maintain. Dual flush systems on the hand cost more in terms of purchasing, installing and maintenance.

Further Reading:

Single Flush vs. Dual Flush Toilets

Common Dual Flush Toilet Problems & Fixes

How to Convert a Single Flush to Dual Flush Toilet

Types of Toilet Flush Systems & Mechanisms

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