Dual flush toilets are now quite common but not a lot of people actually understand its features and its benefits.
So if you happen to be renovating or upgrading your bathroom fixtures, you may be surprised that there are actually a variety of dual flush toilets in the market that you can choose from.
You may get confused if you don’t understand its features or certifications that are available in the dual flush toilet.
So, what is a dual flush toilet?
It may seem to be a recent innovation but actually, it was first proposed during the 1970s in a book called Design for the Real World by Victor Papanek. Unfortunately, it was only during the 90s that people actually implemented dual flush toilets most especially in Australia where water resources can get quite scarce.
Basically, it is a toilet with a flushing mechanism with two different options for the amount of water to be used: half flush with the smaller button or lever and a full flush for the larger one.
You will find that these toilets can range from a few hundred to half a thousand dollars depending on their make and materials. They are quite costly so make sure that you choose the one that will suit your needs at home or on your office.
Here are some of the features that you have to look for when buying a two flush toilet: the rough in measurement or the distance between the wall and the center of the toilet pipe, the shape of the bowl – round is good for smaller spaces.
While the elongated are preferable for larger ones, the height of the toilet seat, the size of the trapway, and the amount of water that will actually be used for a half flush and a full flush.
So without discussing any further, here are some of the best options that you can find for a dual flush toilet.
TOP 5 Dual Flush Toilet Reviews – Comparison Table
TOTO Aquia – Dual Flush Elongated Two-Piece Toilet
- Dual-Max flushing system
- Low consumption (1.6-GPF/6.0-LPF and 0.9-GPF/3.4-LPF)
- Elongated skirt, Universal Height
- Close coupled, elongated front bowl and tank set, less toilet seat
- Watersense Cerfication
- Chrome push-button
The Aquia makes use of a siphoning system to handle solid and liquid waste using a 2 1/8” diameter trap way. It also has a Sana Gloss finish which means it has a good system of preventing water stains and dirt clinging to the inside of the bowl although this is not as good as other finishes. The dual flush system makes use of a 0.9 gallon flush for liquid wastes and 1.6 gallons for a full flush.
This toilet has an elongated and semi-skirted design which means that you get a comfortable seating and a clean modern look without the exposed S-trap outlines. It also comes with a 12-inch rough-in which is similar to that of traditional single flush toilets so installing or replacing old toilets is quite easy.
Due to its smaller size, it can also easily fit smaller bathrooms or half-baths. It also complies with the ADA standard for seat height so this makes it ideal for those with family members who may have physical challenges in using the toilet. This toilet is recommended for those who are looking for a mid-priced toilet but with an ADA compliant feature as well as Water Sense certification. The Sana Gloss finish and the skirted design ensures less time for maintenance and cleaning.
American Standard H2Option Siphonic Dual Flush Elongated Two-Piece Toilet
- H2Option Dual-Flush System
- Featured with PowerWash Rim
- Jet-Powered Siphon for cleaner bowl and flush
- Speed Connect system cuts installation time by 30 percent
- EverClean Surfaceto keep clean and stays cleaner longer
- 5-year warranty
The American Standard H2Option is another high efficiency toilet that allows you to save on water consumption while also giving you a perfect performance. It is one of the lower priced dual flush systems available which also has a good set of features.
This American Standard double flush toilet has an elongated design with a 12-inch rough in which means that you get more seating room and you don’t have to install new pipes for the toilet. It also makes use of siphonic action to get rid of solid and liquid wastes but it may not the best in water saving features. It still makes use of about 1 gallon for a half flush and 1.6 for a full flush.
This double flushing toilet has an EverClean finish which makes it look glossy and also requires less cleaning than standard toilets. It also features a PowerWash Rim which makes use of pressurized water to rinse any dirt which may stick to the bowl. There is also the Jet Powered siphon action which means that water does not only come from the rim but is also fed directly into the bowl for better flushing. The chrome dual flush buttons at the top of the tank gives it a modern and classy look. Installation is quite easy as it comes with pre-assembled parts so all that you have to do is install it.
If you are looking for a toilet with an excellent flushing mechanism and rim cleaning power, then this is the one for you. It provides one of the best waste management system through a pressurized flushing design. It comes with pre-assembled parts and jet powered siphon action. Aside from that it has Water Sense certification which is great if your state offers rebates for this type of toilet.
KOHLER Wellworth Two Piece Round-Front Dual-Flush Toilet
- Two-piece toilet
- Gravity Flush Toilet
- Class Five Flushing Technology
- Round-front bowl offers an ideal solution for smaller baths and powder rooms
- Left-hand nested trip lever
- 1.1 or 1.6-Gallons per flush
- 2-1/8-Inch glazed trap way
- Easy to Install
Kohler is a well-known brand due to its excellent design and high-quality products and the KOHLER K-3987-0 Wellworth is one of its best prodcuts. It makes use of the Class Five Flush system which is an innovation by Kohler and ensures efficient waste disposal with water saving features. Compared to other dual flush toilets, this costs way less than what you can usually find in the market.
The KOHLER K-3987-0 Wellworth is a two-piece gravity type flush toilet combined with a siphoning system which allows for a very effective waste disposal system. It has two flush options: 1.1 gallon half flush and a 1.6 gallon full flush which is less than the traditional 3 gallon standard in the market.
One of its most distinctive features is the Class Five flush system. It makes use of a canister instead of a flapper system which guarantees lesser leaks and more durable seal. It feeds water not only on the rim but also directly on the bowl which creates greater force for the siphon action. You also get the DryLock Fast Install System which ensures a leak-free system without the fuss. The glazed 2 1/8 trap way also ensures less blockage as solid wastes easily go through.
To trigger the dual flush, it has a lever system which makes it easier to use for those with physical handicaps. The rounded design of the bowl also means that you can install it even in smaller spaces. It also has a Water Sense certification which means that you only use about 1.28 gallons of water per day when using this toilet. Overall, this is a great option for those who are on a budget but are looking for high quality and excellent performance in their toilets.
GALBA Small Toilet – One Piece Toilet for Compact Bathroom
- G-Max flushing system, low consumption (1.6GPF/6.0LPF)
- Elongated front bowl and tank set
- Universal Height
- Two-piece design with high-profile tank
- Vitreous china Material
- ADA compliant
- Glazed surface prevents growth of bacteria which cause odor.
The Galba 24.5” compact toilet is one of the smallest toilets that you can find today. It is ideal for those living in smaller spaces as it offers the shortest wall projection. But this doesn’t mean that you will be getting less quality as it provides a great flushing system with two settings – the half flush and the full flush.
This toilet definitely looks small with its seat just a little over 16 inches high and a projection of only 24.5 inches. It makes use of a siphonic system using a G-Max Siphon system and an S-trap. It has a 3” valve which provides great water volume that enhances the efficiency of its siphon system. You also don’t have to worry about installation as it utilizes the traditional 12 inch rough in distance.
This toilet is made from ceramic so even though it is small, it is sturdy and reliable. The finish has a self-cleaning system that makes it more resistant to scratches, staining, and fading. It has an elongated shape so you get a lot of sitting space even with its size. It makes use of a dual button flush system which utilizes 1 gallon and 1.6 gallons of water for a half flush and a full flush so it complies with the water saving features of EPA although without its certification.
The design is also very modern and space saving with its concealed water trap system and minimalistic features. Since it comes in one piece, installation is also very easy. Overall, this is a great toilet if you have a small bathroom space and if you also want to save on water consumption.
WoodBridge T-0001 Dual Flush Elongated One Piece Toilet
- Luxurious modern Design
- Easy-to-Clean Design
- Siphon flushing Design
- Comfort Height Design
- Dual Flush System Design: 1.0 /1.6 GPF, average at 1.28 gallon flush
- High-end Soft Closing Seat with Stainless Steel Durable Seat Hinge
- Easy installation Design
- UPC & CSA, High-efficiency, WaterSense Certified toilet
- 5 year Warranty
The WoodBridge T-0001 has a modern and elegant design which makes for a great upgrade in your bathroom fixtures. It’s concealed trapway as well as the stainless steel hinge creates that sleek and modern feel that will complement any modern bathroom. But most important of all is its highly efficient waste management.
This toilet uses siphon action in order to eliminate solid and liquid wastes from the toilet. The fully glazed trap way ensures a quiet and efficient flush system and no blockage. It’s half flush utilizes 1 gallon of water and the full flush uses 1.6 and it has a Water Sense certification making you eligible for rebates.
It has a comfortable seat height of 16 ½ inches and makes use of a 12-inch rough-in distance so it suitable even for old installations. It comes with a pre-installed toilet seat as well made of durable plastic and with stainless steel hinges for rust-free use. The elongated design also provides comfortable seating. Installation is also very easy as it comes complete with its own floor bolts, wax ring, and a hand wrench tool for fitting.
The one-piece solid design also makes for an easier cleaning since there are no narrow crevices to reach. Overall, this toilet is made for those who are looking for a very elegant and modern look while giving high efficiency of water usage.
Buying Guide: Single Flush vs Dual Flush
Buying a dual flush toilet may be more costly than a single flush model but in the end, it is about the water savings that you accumulate and how you help conserve one of the most important natural resource in the planet. Personally, I would prefer the dual flush toilet if only it can help save on costs for the next 3 or 6 years. It will definitely be worth the investment especially with the rising costs of utility bills.
But there are also ways of saving on a single flush system although it is not as convenient like putting a brick in the tank to make up for water volume. In the end, it will be your decision as to which of these systems you will choose.
Here are some comparisons of the basic features of these flushing systems:
Gallons per Flush
The standard single flush system which was popular before the implementation of the Energy Policy Act in 1994 uses 3.5 gallons of water per flush. That is whether it is liquid waste or solid waste. Given the fact that a person has an average use of the toilet at least three times per day, then that would translate to about 10 gallons per person, per day.
On the other hand, dual flush systems only make use of about 1.6 gallons for a solid waste and a gallon for liquid waste. If that is computed at twice the usage for liquid waste and once for solid, then that is only about 4 gallons of water per person, per day. That means you save up to 6 gallons per day on a dual flush system or more than 2,000 gallons of water per year for a single person.
Americans with Disabilities Act or ADA Standards
The 2010 ADA Standards placed a new set of standards for toilets which are to be used by employees or by the public. It required the toilet seat height to be at least 17 inches up to 19 inches. Also, the flushing mechanism should be located at a height of not more than 36 inches from the floor. It should not also require tight grasping, pinching, or twisting of the wrist.
In this area, a lot of dual flush toilets may not come out as ADA compliant due to the fact that the flushing mechanisms are buttons located at the top of the tank. This may seem inconvenient especially since some buttons require to be pushed down for a few seconds before it can effectively flush. As most single flush toilets utilize the lever system, they are therefore more likely to be ADA compliant.
EPA Water Sense
This is where the distinguishing advantage of dual flush systems really come into play. The EPA Water Sense certification is only given to toilets that comply with the Federal standard of 1.6 gallons per flush. Since dual flush systems mostly use low flow technology, they require less water to eliminate solid or liquid wastes. Although there are single flush systems that use only about 1.28 gallons per flush, that is still way more than some other dual flush systems that only use less than a gallon for liquid wastes.
Installation is quite easy when it comes to dual flush systems because most of them carry a one-piece design. This means that the tank is usually integrated with the toilet so when you install the toilet, you install the tank with it. You also don’t have to make a lot of adjustments when installing a dual flush toilet because it also makes use of a 12 inch rough in, which is the traditional measurement of single flush toilets. Aside from that, most dual flush toilets come with their own pre-assembled accessories so installation is quite easy.
How Does a Dual Flush Toilet Effectively Handle Waste?
For most people, the fact that a dual flush toilet makes use of a lot less water can be a cause of concern. This is in particular with removing solid waste from the toilet. Actually, their design is what makes them highly efficient in disposing toilet wastes instead of the amount of water used.
Dual flush toilets have different methods of increasing the force of the water in order to push the waste up to the siphon system. Some of the commonly used methods are the gravity type which feeds a great volume of water directly to the toilet and not just through the rims, the pressurized type which makes use of air in the rims and in the tank, as well as those with low-flow technology which makes use of larger diameters of trapways and a lower rise on the siphon system so that solid wastes are easily disposed of.
Since a dual flush toilet has a half flush setting, it only makes use of the right amount of water for liquid wastes and so there is less wastage. So instead of having a full flush when it is not really needed, you only use less than a gallon to dispose of the liquid waste.