Dual Flush VS Single Flush Toilet Comparison Chart 2020

Are you planning to remodel your bathroom or just want to install a new toilet in your new house? No matter the reason, choosing the right flushing toilet for your home, business, or office is very crucial. A toilet that is great for home use may not be ideal for public use. That’s why we’ve compiled this post to differentiate between the dual flush toilet and single flush toilet. So, which toilet you should buy? What is the main features difference between Dual Flush VS Single Flush Toilet?

Related: 1 Piece VS 2 Piece Toilets [One & Two Piece Features Comparison]

Every toilet has its own advantages and drawbacks. Single flush toilets are the most common type of toilets on the market. They can be found in older homes and most buildings. Single flush toilets use just one mechanism which is the same gallon per flush for all kinds of waste, while the dual flush toilet has two options: One for flushing liquid waste and the other for solid waste.

Comparison Chart: Dual Flush VS Single Flush Toilet


Dual Flush

Single Flush

Technology: New Old
Toilet Cost: High Low
Operate: Not Easy Easy
Water Saving: Lot No
Flushing Choice: 2 1
Replacement Cost: High Low
Parts Availability: Hard to find Easy
Eco-friendly: Yes No
Aesthetics: Not Possible Possible
Maintenance Cost: High Low
Who will Buy? Small Family(& less Guests) Small or Big Family/Public use


Detail Features Comparison: Single Flush vs Dual Flush Toilets

Water usage, Flushing system, Maintenance, cost etc. features difference between Dual Flush and Single Flush Toilet.

Water usage

Single flush or gravity toilets are the most common types of toilets on the market. The older models of single flush toilets used a lot of water to push down the waste but they have undergone a lot of improvement. Today, single flush toilets in America use 1.6 gallons of water per flush or less. The law requires that every toilet in the country should use 1.6 gallons of water or less. Before then, some toilets used even up to 5 gallons per flush. But there are also some high-efficiency (HET) single flush toilets that use less than 1.28 GPF.

Related: 1.28 VS 1.6 GPF Toilets

On the other hand, double flush toilets use 1.6 gallons of water for a full flush and 0.8 gallons of water for a half flush. The full flush is meant for pushing down the solid waste, while the half flush is for clearing liquid waste. Normally, the toilet features two buttons on the tank lid that are pressed for either a half or full flush.

When you compare the single flush and double flush toilets, it is clear that the dual flush toilet has an edge over the later. With a dual flush system, you will save more water as you have the option of using less water for liquid waste and more water for solid waste. While with a single flush, the water is constant at either 1.28 GPF or 1.6 GPF. The single flush system is suitable for use in a busy bathroom, like in public restrooms, while a dual flush toilet is suitable where the numbers of users are few.

Related: Types of Toilet Flushing Systems(Most Popular)

Flushing system

Even though dual flush toilets help you save more water, some users have reported experiencing difficulty during flushing. The button located on the toilet tank can at times require more force to press it. But with the chrome trip lever, this is never the case. This can somehow be challenging for disabled and elderly people.  Therefore, when it comes to flushing, the single flush toilet is the best choice as it is easier to use when compared to a dual flush toilet.

Ease of maintenance

Dual flush toilets are very effective and convenient to use. They offer you the option of choosing either a half flush or a full flush. The main challenge with this kind of toilet is that it is not very easy to maintain as its parts are hard to get. Alternatively, single flush toilets are very popular and have their spare parts all over the market. So, if you want to replace the lever or flush valve of a single flush toilet, you will find replacement parts easily and quickly.

Related: Elongated VS Round Toilet: [Features Comparison + Recommendation]


If your aim is to save a lot of water and have an eco-friendly toilet, then the dual flush toilet is the best option. Dual flush toilets use very little water but they are very effective in performance. When you install this type of toilet in your house, you may end up saving more than 25, 000 gallons of water per year. Also, you may be in a position to get rebates in some states if you are replacing an older toilet with a high-efficiency toilet.


The biggest advantage that a single flush toilet has over the double flush toilet is that it can be modified to blend with the environment. Single flush toilets feature a lever which can be changed to match your bathroom décor. This is not the case with the buttons placed on the dual flush toilet as they cannot be easily changed.

Related: Comfort Height VS Standard Toilet: Which Type of toilet is Worth to Buy?


Finally, the single flush toilet is cheaper than the double flush toilet. But if you take into consideration the amount of water you will be saving with a dual flush toilet, you will release that it is cheaper in the long run. You just have to maintain it in the best condition as maintaining a dual flush toilet is costlier than maintaining a single flush toilet.

So, Which is better? Dual Flush or Single Flush Toilet?

Regardless of whether you are replacing your old toilet or installing a new one in your new house, it is important to understand the benefits and shortcomings of different types of toilets. Single flush toilets can be suitable in high traffic areas, while double flush toilets are ideal for home use. Also, depending on the state that you live in, it is a good idea to follow their regulations and get the right toilet.

To conclude, I can gladly say that the dual flush toilet is the best option between the two and it is gaining popularity slowly by slowly. It uses less water, offers the user the option for clearing solid or liquid waste, and it is cheaper in the long run.


Question: Should I select a toilet that utilizes a maximum of 1.6 GPF or 1.28 GPF?
Answer: This depends on how much water you want to save and what state you reside in. If you want to save more water and get rebates on your water bill in some states, then you should go for a toilet with a maximum of 1.28 gallons of water per flush. Also, people who live in states like California and Georgia are required to have a flushing toilet that uses 1.28 gallons of water per flush or less. Generally, it was passed by law that all toilets in the country should use 1.6 gallons of water per flush or less.

Question: Is it difficult to install a toilet on my own?
Answer: This is not a very challenging thing. All you need is to assemble the right tools and follow instructions to the end. Note that one-piece toilets are hard to install than two-piece toilets. This is because they are heavier and cannot be installed by one person. Before you install a toilet, you should know your toilet rough-in so that you don’t buy the wrong toilet rough-in. the standard rough-in is 12-inches while there are some old models with a 10-inch or 14-inch rough-in.

Question: What are the disadvantages of a dual flush toilet?
Answer: Even though dual flush toilets are very convenient, they’ve their own drawbacks. First of all, dual flush toilets are more costly than single flush toilets. This alone makes many people shy away from these toilets and instead they purchase a single flush toilet. The second drawback is that dual flush toilets are not as prominent as single flush toilets. They have limited designs and a few options to choose from when compared to single flush toilets.

If you have any confusion after reading this Dual Flush VS Single Flush Toilet article, comment below.


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