Two Piece Vs One Piece Toilets

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Last Updated on August 5, 2022 by acechapman

There is a possibility you might be debating between these two toilet types: two-piece vs one-piece toilets for your bathroom. It’s almost as if you were arguing about Ironman or Captain America.

Many might have seen plumbers and “experts” slam two-piece toilets while praising one-piece toilets. Although one-piece toilets have their advantages, does the one-piece toilet really outperform the two-piece?

The Basics: Two Piece vs One Piece Toilets

The main components of a toilet are:

  • Bowl – It is designed to collect all your waste and then swallow it into the sewer.
  • Pedestal – The part that lifts up from the ground which holds the toilet bowl.
  • Tank – This is the container at the back that holds water for flushing. It also gives pressure to flush out waste.

One-piece toilet: This is also called a single-piece toilet. The toilet and tank can be joined together without joints. 

Two-piece toilet: Also known as coupled toilets. The toilet and tank can be separated and connected using fittings. 

A one-piece toilet, in simple terms, is made up of many small parts. It takes skill to put together all of the pieces. It is unlikely that one-piece toilets will be more expensive until 3D printers are available for production.

Difference Between Two-Piece And One-Piece Toilets

Cost of Shipping

This is another important factor. One-piece toilets weigh more and are more difficult to transport.

Two-piece toilets can be shipped lighter because the tank and bowl are separate.


The price is extremely important, especially if you have the funds to spend an additional one or two hundred dollars on a high-quality product or a defective product. Due to the manufacturing process, single-piece toilets tend to be more expensive than two-piece toilets.

It is often misunderstood that single-piece toilets have smaller dimensions than two-piece toilets. Because the one-piece toilet does not have separate parts, it will be easier to compact into one unit.

Single-piece toilets may have a different design in some cases. For example, take TOTO 500 and Sanicompact. There will be no significant difference in size between standard two-piece and one-piece toilets.


Two-piece toilets are heavier than standard one-piece toilets, which weigh in at around 40kg and 25kg respectively. The reason for this is that the one-piece toilet holds ceramic tanks during production. As a result, the weight of the toilet will increase.


Is the functionality of these two toilets different from one another? No! It’s the inside that counts the most, as the old saying goes.

Functionality refers to the power of the flush. We are therefore referring to the flushing mechanism.

Surprisingly, toilets are made to flush out human waste, which is the main function.


The difference in the durability of these two-piece vs one-piece toilets is the same as the flushing power.

Although different manufacturers may have different qualities, the overall quality of these models is comparable. You should also know that the tank and bowl can sometimes crack due to their two-piece construction, but this only happens rarely.


One-piece toilets outperform two-piece toilets when it comes to installation. They can be difficult to transport, but they are easier to install than two-piece toilets. This is because the tank and bowl can be hassle-free when connected.

However, the two-piece toilet requires a second pair of hands to install. You must be careful not to crack the porcelain when attaching the tank and bowl.

Two-piece toilets usually are not equipped with a wax ring or a seat.

Wall mounting is also possible for some one-piece toilets, which can help you save space in small bathrooms.

Cleaning and Maintenance

Again, one-piece toilets have the advantage over the other during cleaning and maintaining 

One-piece toilets do not have a gap between the bowl and the tank. This is because bacteria and germs can grow in these gaps with two-piece toilets.

Both toilet types are similar in terms of functionality and service life.

Two aspects are important in maintenance:

  • Short term
  • Long-term

Short-term: The joint between the tank bowl and the bowl of a 2-piece toilet may wear down.

Long-term: You can find replacement parts for two-piece toilets cheaper because each piece is sold individually. This means that you can replace either the tank or the bowl separately. If the one-piece toilet fails, you will need to replace it all.

Which One Should You Choose?

There isn’t much difference between the two-piece vs one-piece toilets. Don’t allow others to fool you into spending more than you actually need.

Personally, I will choose a one-piece toilet design preferably and the wall-mounted option.

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