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Home » One-Piece Toilet: Definition, Pros, And Cons, How It Works, Size

One-Piece Toilet: Definition, Pros, And Cons, How It Works, Size

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Making an appropriate choice between the toilets is difficult. There are a plethora of toilet types that exist when it comes to style, design, and functionality. But one of the popular designs among the many is a one-piece toilet. The lack of information on this remarkable toilet piece prevents many from making informed decisions. 

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To ease your stress, this article will act as a comprehensive solution. Know everything you are struggling with when it comes to one-piece toilets. The key aspects include an overview, working mechanism, pros, cons, specifications, and more. Stick to this highly informative guide on One-Piece toilets and dive deeper!

Related reading: Toilet Buying Guide

What is a One-Piece Toilet?

One-piece toilet refers to a toilet in which the toilet bowl and water tank collectively make up a single toilet piece. They are not like two-piece toilets in which there lies separation between the toilet bowl and toilet tank. These toilets are jointless and do not contain any services. They rather feature a continuous design. 

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A plethora of styles and sizes exist when it comes to the one-piece toilet. The one-piece toilets use a flushing mechanism to transfer waste from the toilet into the sewer set. The One-piece toilet’s aesthetical appearance contributes to your bathroom’s visual appeal.

Size Specifications of One-Piece Toilets

Several sizes exist when it comes to one-piece toilets. Some of the popular sizes include:

Sr. No.ProductLength (mm)Width (mm)Height (mm)
1One-Piece Toilet730360660
2One-Piece Toilet705370670
3One-Piece Toilet760510790
4One-Piece Toilet680370720
5One-Piece Toilet670370750
6One-Piece Toilet670345725

You can order custom-size one-piece toilets from the above one-piece toilet sizes. Before buying cross check with your buyer.

Types of One-Piece Toilets

There are different types of one-piece toilets exist. Get highlight on key types:

Gravity Flush One-Piece Toilets

These toilets have a flushing system that works under gravity to remove waste from the toilet. There is no need for mechanical water-forcing equipment. These toilets have low cost. They are popular for silent operation and negligible maintenance.

Pressure-Assisted One-Piece Toilets

Unlike gravity flush toilets, pressure-assisted one-piece toilets offer flush with greater force. This way, they contribute to effective flushing. The benefit of these toilets is that they do not experience any kind of clogging. They are highly suitable for higher-frequency usage.

Dual Flush One-Piece Toilets

The dual flush toilets use a double flushing system. These toilets come with two flushing buttons. One facilitates the lower volume flush, and the other a higher one. This toilet adds up to the water efficiency and cuts off your water bills.

Key Components of The One-Piece Toilet

Multiple components play a key role in forming the one-piece toilet. Some key components that need your focus are:

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Toilet Bowl

The bowl is a key component of the toilet. It receives and transfers human waste. The design of the bowl affects the efficiency with which waste gets removed. 

Water Tank

As the name reflects, the water tank holds the water inside, which will serve the purpose of flushing. In a one-piece toilet, the bowl is directly connected to the bowl without any separation. 

Flushing System

The flushing system generates the pressure needed to ensure effective waste removal. It may use dual flush, pressure-assisted flush, or gravity flush per the toilet design. 

Flush Valve

The function of the flush valve in the one-piece toilet is undeniable. It plays an effective role in controlling the water release from the tank. 

Fill Valve

Another name for the Fill valve is the ballcock. It plays an important role in the one-piece toilet by regulating the water flow after flushing from the tank. Besides this, the valve also ensures optimum water level for the upcoming flush.  

Lid and Seat

The seat offers a highly comfortable sitting experience. It plays a vital role in maintaining hygiene. On the other hand, the lid covers the bowl. 

Wax Ring

The wax ring seals off the spacing between the sewer pipe and the toilet’s base. This prevents the foul smell and any kind of leakage from the toilet. 

Fasteners and Bolts

Fasteners and bolts fix the toilet in place, either on the wall or on the floor. This keeps up the stability of the toilet. 

Flush Button/Handle

The flushing button or handle initiates the flushing process. It can be a chain, level, handle, or push button. It can also be a touchless sensor. 


refers to a tramway. The term “S” in S-Trap indicates the shape of the tramway. S-Trap transfers the water from the toilet bowl into the sewage system. It prevents odors in your bathroom. 

Water Inlet Valve

The valve is crucial for the water supply to the toilet. You can find it in two different positions, either sideways or on top/bottom. This valve controls the amount of water that goes into the water tank.  

Working Mechanism of One-Piece Toilet

The working mechanism of the one-piece toilet is similar to the standard toilets, such as:

After using the toilet. You need to push the button/lever/handle. Pressing the button will open up the flush valve. This allows the water stored in the water tank to move from the water tank. The water then enters the bowl. It can happen in three ways, depending on the flushing mechanism.

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Through the bowl, the water takes the waste into the draining system. At the same time, the water cleans up the bowl by following the double cyclone flushing. The S-trap assists the water in taking away the water into the sewage system. After the flushing occurs, the inlet valve opens up and fills the toilet water tank for a new flush. This is how a One-Piece toilet works. 

Pros of One-Piece Toilet

The one-piece toilet offers a number of advantages. Some of the key benefits are as follows:

Effortless Cleaning

The one-piece design of the one-piece toilet facilitates convenient cleaning. You don’t need to put the effort from your side. No hinges, joints, or services may hide the dirt, grime, or dust. Besides this, the design contributes to hygiene and prevents bacteria accumulation. This makes the cleaning process efficient and simple.

Compact Size

The One-piece toilet does not take up much space. It is unlike a two-piece toilet with a separate bowl and water tank. If you have limited bathroom space, a One-Piece toilet will be best. The compact size adds aesthetics to your bathroom and makes your bathroom spacious.

Minimized Leakage

As in a One-piece toilet, there are not many connections. Therefore there is a very low chance that you will experience leakage. This adds up to the overall durability of the toilet. Minimized leakage means you will enjoy hassle-free operation in the long run. 

Noise Free Operation

Due to the lower number of connections and components, the one-piece toilet offers noise-free flushing. You are not going to experience any kind of vibrations or movement with the one-piece toilets. This benefit is worth it, especially in the commercial setting.

Easy To Install

When installing the One-piece toilet, you don’t need to acquire special training, knowledge or expertise. The product comes with an instruction manual. Anyone, even a non-special person, can use this manual to deal with the installation on the go. The lower number of components also assists in this regard.

Higher Durability

The presence of zero joints adds up to the durability of the one-piece toilet. The integrated injection molding technology also contributes to the toilet’s strength and hardness. This means you can enjoy a longer life using the one-piece toilet than other variants. 

Cons of One-Piece Toilet

Apart from the benefits, there also exist some disadvantages. Get insights on these disadvantages down below:

Higher Cost

The one-piece design of the toilet makes this toilet type expensive. This is because higher quality materials go into manufacturing the One-Piece toilet.


In case any component of the one-piece toilet breaks or malfunctions. It is not easy to replace it. This is because you need to replace the whole toilet. Also, the replacement is hectic with this toilet, so you need to deal with the reserves carefully.

High Weight

The weight of the one-piece toilets is more than those of two-piece toilets. This point also makes the installation of the toilet challenging. 

Limits Customization/Design

Because of the one-piece design, you cannot enjoy many customization options when it comes to the one-piece toilet. Also, the design availabilities of these toilets are limited. 


Consider insights on the frequently asked questions about the one-piece toilet:

Which One to choose, a One-Piece bathroom or a Two-Piece toilet?

Each toilet offers different perks. The one-piece toilet provides you with faster installation because of fewer components. At the same time, a two-piece toilet is convenient to handle during installation. You finalize the choice as per your requirements.

What flushing mechanism is best for a one-piece toilet?

If you want to conserve water, use the dual flush mechanism. Otherwise, if you will experience an effective flushing system, select the pressure-assisted flushing method. 

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