Are you planning to remodel your bathroom or installing a new toilet in your new house?

When you plan to remodel your bathroom, it is important to choose the right flushing toilet for your home, business, or office. A toilet that is great for public use may not be ideal for home use. In this post, you will learn to differentiate between a single flush and a dual flush so that you can decide which toilet you should buy.

Every toilet has its benefits and disadvantages. Single flush toilets are one of the most common types of toilets on the market, and they are common in older homes and most buildings. Single flush toilets use one gallon per flush for all kinds of waste, while the dual flush toilet has two options: One which uses half a gallon for flushing liquid waste and the other one which uses a full tank/gallon to flush away solid waste.

Comparison Chart: Dual Flush vs. Single Flush Toilet

Dual Flush Single Flush
Technology New Old
Operate Difficult Easy
Cost High Low
Eco-friendly/Water Saving Yes No
Flushing Choice 2 (half and full) 1 (full only)
Maintenance Cost High Low
Suitable for Small Family Small or Big Family/Public use

Water usage

Earlier, older models of single flush toilets would use a lot of water to push down waste – some toilets would use up to 5 gallons per flush, but over time, things have improved. Today, there are some high-efficiency (HET) single flush toilets that use less than 1.28 gallons per flush (GPF). The law in America requires that every toilet in the country should use 1.6 GPF or less.

1.28 vs. 1.6 GPF Toilets

Double flush toilets use 0.8 gallons of water for a half flush for clearing liquid waste and 1.6 gallons of water for a full flush for pushing down solid waste. Normally, there are two buttons on the tank lid for either a half or full flush.

You will save more water with the dual flush toilet as you have the option of using less water for liquid waste.

While with a single flush, there is less water economy as water is constant at either 1.28 GPF or 1.6 GPF. The single flush system is suitable for use in a busy office bathroom, public restrooms, while a dual flush toilet is appropriate where there are only a few users.

Toilet Flushing Systems

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 sometimes requires more force to press it. But with the old chrome trip lever on the single flush, this never happens. Dual flush can be challenging for elderly and disabled people. Hence, when it comes to ease of flushing the toilet, the single flush wins it.

Ease of maintenance

The main challenge with the dual flush is that it is not always easy to maintain as its parts are hard to find. Whereas single flush is popular and has its spare parts all over the market. For instance, if you need to replace the lever or flush valve of a single flush toilet, you will find replacement parts easily and quickly at your local store.


Dual flush toilets are a more eco-friendly option if you aim to save a lot of water. They use little water, but they are very effective in performance. When you install this type of toilet, you can save more than 25 000 gallons of water per year.

Which type of toilet should you buy?

On a cost comparison, the double flush is more expensive than the single flush. However, if you consider the amount of water you will be saving with a dual flush, in the long run, it is worth the investment.


No matter of whether you are replacing your old toilet, remodeling your bathroom, or installing a toilet in your new house, it is essential to understand the benefits and disadvantages of these two types of toilets. Take your time to analyze how they will best suit your daily life and the people around you. Single flush toilets are more appropriate in high traffic areas, while double flush toilets are convenient for home use. Also, according to the regulations of the state where you live in, it is a good idea to get the right toilet.

If you are still in doubt, you can contact a professional plumber who would provide you with the best advice based on your daily use. I hope the above will help you make your choice. Don’t forget to drop down your comments in the section below.

Dual Flush vs. Single Flush Toilet

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