One Piece vs Two Piece Toilet. Which Is Better?


One Piece vs Two Piece Toilet – A Comparison Review

One Piece vs Two Piece Toilet

One Piece Good But Two Piece Not Necessary Better

When a one piece and a two piece toilet are place side by side, which will you choose? Without getting into the cost and features, the one piece is always the winner.

Why’s that so?

Looks is everything. Yes, the one piece toilet is better in appearance, they have the modern feel. That’s why.

But that’s hardly the case for the pragmatic toilet hunters. Looks may be the last thing on their list. They see beyond looks, sometime even beyond cost. They see only benefits and value for their hard earn money.

So what are the benefits and value between the two?

It will depend on how you prioritize your needs and which one benefits you the most.

Both design has its drawbacks even though they may have the same performance level. So understanding the pros and cons will help you decide on a toilet that’s right for your home and your budget.

In a hurry? You may skip straight to the summary.

Difference In Construction

It’s easy to differentiate between the two design with their respective construction.

The common two-piece toilet consists of a separate tank and bowl. Whereas the one piece toilet will have the tank molded with the bowl as one whole unit.

You can tell the difference by looking at the joint between the tank and the bowl. A clear seam is visible on the two piece toilet, and there’s none for the one-piece toilet.

So what are the advantages and disadvantages of the 2 constructions?

The main advantage of the two piece design is you can replace the tank and bowl separately. If the tank is broken, you just need to replace the tank. Likewise for the bowl.

But if you broke either part of a one-piece toilet, you will need to replace the whole toilet. This is the only drawback of the one piece toilet, besides cost.

And since the tank is fused with the bowl, there is no need to make provision to support the tank. This is where some space can be saved and make the overall construction more compact. Which explains why most of the space saver toilets are of the one piece design.

Besides looking great, one piece toilet is very easy to clean and maintain. That’s the best advantage above all.

What’s the smallest one piece floor-mount compact toilet in USA? Find out here.

Keeping The Toilet Clean

The one-piece toilet is easier to clean because there is no gaps or joint between the toilet tank and the bowl. And its a lot more hygienic since there’s no place for dirt and grime to gather. Most people choose the one piece design mainly for this reason.

The joint area of the two piece toilet can be a breeding ground for mold and bacteria if left unclean over time. And it is difficult to clean the area thoroughly without removing the tank. Besides, there’s the risk of leaks between the tank and bowl if the tank is not installed back properly.


Which perform better? One piece vs two piece toilet.

Performance wise, there is no difference between the one piece and two piece toilet.

In fact, they can have the same flushing power and efficiency. The interior parts are almost identical if they are from the same manufacturer. They may even have the same features and specifications.

So whether you prefer comfort height or water saving feature or compact toilets, you can find in both one piece and two piece toilets.

Installation – One Piece vs Two Piece Toilet

Installing a toilet
One piece toilet can be a challenge to install due to its size and heavy weight. And especially difficult when you have a small space for a toilet. Strong arms and a good back will make an easy install, otherwise getting help is not an option.

But once you get the toilet into position, the installation is almost done. Since you don’t have to deal with the tank installation. So in this regard, the one piece toilet is easy to install for the experienced DIYer.

The two piece toilet is easier to install in the sense you can deal with the tank and bowl separately. That would split up the total weight between the bowl and the toilet tank.

With lesser weight to wrestle with, typically one person can complete the entire installation. However, the tricky part is mounting the tank onto the bowl. Always follow the manufacturer’s instruction to a T to avoid leaks later. And cracks on either the bowl or the tank can happen when you over tighten the bolts.

So regardless if it’s a 1 piece or 2 piece toilet, get professional help if you aren’t confident with the work.


Since the one-piece toilets are a one large piece of porcelain, there are no joining parts to upkeep. From an engineering point of view, the lesser parts or connectivity, the more reliable it will be.

Hence, up keeping a one-piece toilet is super easy. There is no worry of water leaking out of the tank to mess up your bathroom floor.

The 2-piece toilet will need the extra care for leaks once the rubber gasket that seal the tank has had its day.

Besides the usual replacement of tank interior parts, both designs can last for many years under proper care and usage. But since the one piece model do not have the joining part, there is no out-leaking problem to deal with. Hence it is a more durable toilet over the two piece model.

The More Expensive One Piece Toilet

In general, a two piece toilet cost less than its one piece counterpart, for 2 reasons.

According to ConsumerReports.org, about 80% of toilets sold are the two piece toilet models. The main reason being they have been around longer and home owners are familiar with it. So that provides the economy of scale that relatively brings down the production cost.

While the one piece toilet doesn’t quite have the scale, its production cost is higher in comparison. Add to its higher cost is the more complex production process of the one piece toilet.

But still the one piece design is affordable for most consumers. The price ranges from $300 up to over a $1000 for some higher end models.


One piece or two piece toilet. Have you got an idea of which toilet type you are going for?

Let’s recap what has been discussed so far.

One Piece Toilet


  • Great aesthetics. Good match for a contemporary bathroom design in every modern home.
  • Easy to clean and up keep. More hygienic with no joining parts for dirt and bacteria to hide.
  • No worry of water leaking out of the tank and flooding the floor.
  • More durable due to no joining part to maintain.
  • More compact in size. A space saving toilet for small bathrooms.


  • Cannot replace toilet tank or bowl separately. Once you break the porcelain, you need a new replacement for the whole toilet.
  • Heavy and bulky to install. But when secured to the toilet flange, the job is 90% done. So in this regard, it may also deem as an advantage to some people.
  • Higher price.
Two Piece Toilet


  • The tank and bowl can be installed separately, so it is less bulky and lighter to handle.
  • The toilet tank and bowl can be replaced individually.
  • Cheaper than the one-piece toilet.


  • Need to clean the area where the tank joins to the bowl. And it’s difficult to thoroughly clean the joining area without removing the tank.
  • Joining area attracts dirt, grime and bacteria.
  • Water will leak out of the tank when the rubber seal starts to deteriorate.
  • Not as sleek looking as the one-piece model.

So that’s it. Thanks for reading and hope you are clear with the differences between the one piece and two piece toilet.

It will be great if this article has helped you with your buying decision. And you may have a point or 2 to add, so let us know by leaving your comments below.

Happy shopping!

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