One vs. Two-piece Toilets – What’s the Difference?

If you ever needed to remodel the entire bathroom or just replace your leaky toilet, you already know that buying a new toilet can be a challenging and time consuming process. There are thousands of them on the market, and they all have different sets of features; there are countless of different flushing systems, designs, and not every toilet is able to flush down the waste with the same efficiency.

One of the many options most consumers have problems with is choosing the style of the toilet; a toilet can be one-piece or two-piece. Both styles have unique sets of advantages and disadvantages, and this guide will help you understand everything you need to know before you decide to purchase a new toilet that will serve you for years to come.

The difference

One-piece toilets are made of a single piece of material. This means that the tank and the bowl are already molded together, and the tank can’t be removed from the bowl without breaking the whole ceramic frame of the toilet. You can easily identify one-piece toilet by checking out the area between the back of the bowl and the tank. If there is no visual line of space between them, the toilet is made of a single piece of material.

Two-piece toilets are made of two pieces of material which means that the bowl and the tank are made as two separate units. The bowl has holes at the back, and the tank is mounted on it with fittings. The tank is completely removable and if something starts leaking, replacing the tank with a new one is usually the appropriate solution.

Size difference

When it comes to size, both one- and two-piece toilets are available in wide range of them. A One-piece toilet usually takes less space because the tank sits closer to the back of the bowl which in theory makes one-piece toilets a little bit more compact if we’re talking about a few inches.

Appearance and design

Both one- and two-piece toilets come in wide range of designs. The one-piece toilet has sleeker appearance, they are more appropriate for modern and contemporary bathrooms, although both one- and two-piece toilets come in variety of designs, from traditional to contemporary.

Tank Toilet

One or Two-piece Toilets?


Both styles of toilets are fairly similar to install, but there are few minor differences. A one-piece toilet is slightly harder to maneuver and move around because you need to move the whole unit at once while you can move the tank and the bowl separately with a two-piece toilet which allows you to move less weight at once. However, the two-piece toilet needs the tank and the bowl to be bolted together which isn’t a hard work by any means, but it takes away a few precious minutes of your time.


One of the most notable advantages of one-piece toilets is that they require less maintenance. Because the tank and the bowl are fitted together in seamless design, there’s no space between them where bacteria can nest and reproduce.


One-piece toilets are more durable in theory. The tank and the bowl are molded together, and there’s less chance of breakage between the couplings.

Flushing system

When it comes to flushing system, efficiency, and flushing power, there’s no difference between one- and two-piece toilets. Both can be highly water efficient, and both can have different types of flushing systems.


One-piece toilets are traditionally more expensive because manufacturing a toilet from a single piece of material requires more work and is a little bit more complicated.

While the price for installing the toilet is usually the same for both one-piece and two-piece, it’s good to know that one-piece toilet can cost more on the long run if something starts malfunctioning. If the toilet tank starts malfunctioning beyond repair, you will most likely have to replace the entire toilet. If the same situation happens with a two-piece toilet, you can simply unscrew the tank and replace it with a new one without the need of buying a whole new unit.

Final conclusion

Two-piece toilets are much more popular among homeowners because most consumers are used to them. They simply work, they are more affordable, and although one-piece toilets outshine them in most areas, most consumers find them as an unnecessary expense.

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