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The 4 Best Rear Discharge Toilets

Note: This post may contain affiliate links. This means that at no cost to you, we may receive a small commission for made purchases.

If you are new to the world of rear discharge toilets, you have come to the right place.

This article will cover all the important aspects of these toilets such as how they work, their pros and cons of them, and four of the best rear discharge toilets you can get on the market today.






Signature Hardware Ebler


Toto Aquia Wall-Hung Toilet


Saniflo 023 Sanicompact


American Standard Yorkville

What Is A Rear Discharge Toilet?

A rear discharge toilet, also known as a back outlet or rear outlet toilet, is one that empties its waste into the wall from the back. Other toilets expel waste from the bottom and through the floor.

Rear discharge toilets are particularly useful in high-rise residences. This is due to the fact that they do not require through-the-floor plumbing, hence the floor does not need to be thick.

This allows for the construction of more floor units than would be possible with floor outlet toilets.

These toilets are also an excellent choice if your home or bathroom is located distant from sewage connections. They make it simple to connect the waste from the toilet to the sewage lines.

Another advantage of getting a rear discharge toilet is that it is less expensive to add to the home compared to a standard toilet in a bathroom that doesn’t have a drainage system.

To install the plumbing for a floor outlet toilet, you would have to rip up the whole bathroom floor. A rear discharge toilet merely requires a hole in the wall, which is easier and less expensive.

How Does A Rear Discharge Toilet Work?

Toilets with rear outlets (see also ‘What To Know Before Buying A Rear Outlet Toilet‘) are set up a little differently. Instead of leaving through the floor, waste escapes via the bathroom wall.

The distance from the finished floor to the center of the waste outlet may be used as the rough-in measurement for any rear-outlet toilet.

They function by rapidly discharging water from the tank into the bowl, pushing waste out via the water. The trash goes first, then water follows, resulting in a longer drain line carry and more efficient flush.

There are different ways in which a rear discharge toilet works


Wash-down toilets do not necessitate the construction of a siphon. They function by rapidly releasing water from the tank into the bowl, pushing trash out first, then the water.

The waste is flushed first, followed by the water, resulting in a forceful flush and a longer drain line carry.

This technology allows for a significantly bigger trapway capacity, does not clog, and can withstand the additional force necessary for a back outlet toilet, resulting in no difference in flushing performance between normal and back outlet toilets.


A siphonic toilet works by forming a siphon in the trapway, which draws water and waste out of the bowl.

This is the most prevalent flush type in North America, however, when utilized for a back outlet product, siphonic technology can be troublesome since the flush is not powerful enough to pull waste into the wall-mounted rough-in owing to the absence of gravity support.

Waste follows after the water, with a shorter drain line carry, because water is required to form the siphon and take out the waste.

Pressure Assist

Because traditional siphonic back outlet toilets seldom flush efficiently enough on their own, manufacturers turn to pressure-assist variants.

These feature a bladder within the tank that is under high air pressure and forces the waste into the trapway.

Pressure assist toilets are normally quite good in flushing, but they are also noisy, costly, and difficult to fix and maintain.

When acquiring a new toilet, you should do your homework. Not only do you need a toilet that works properly 100 percent of the time, but it’s also crucial to consider noise, design, and water savings because a good toilet may last you decades.

The Pros And Cons Of A Rear Discharge Toilet

Before you look into getting yourself a rear discharge toilet, you should think about the pros and cons that come with getting one. 


One of the most frequently mentioned advantages of rear discharging toilets is its look when compared to traditional, floor flushing toilets.

Rear discharging toilets produce considerably cleaner lines in your bathroom, giving it a more contemporary and sleek appearance.

Rear discharging toilets also conceal all of the pipes and plumbing fittings that are sometimes exposed in-floor flushing types, increasing aesthetic appeal.

One of the arguments in favor of rear discharge toilets is that they frequently have higher flushing power than their floor flushing equivalents.

This is frequently due to pressure-assisted systems in rear-discharge toilets that aid in the flushing process.

Rear discharge toilets are useful because they may often be built-in situations where floor flushed toilets cannot.

For several reasons, conventional floor flushed toilets cannot always achieve the appropriate fall for waste drainage. Rear discharge toilets can be an effective option in situations like these.

Rear discharge toilets are often thinner and more compact than their floor flushed equivalents.

This space-saving technique may help your bathroom look larger and allow you to fit more into the same area.


One of the primary disadvantages of rear-discharge toilets is that they are not as extensively manufactured or installed as traditional, floor-flushing types.

As a result, rear discharging toilets remain something of a niche industry, and the accompanying prices are frequently higher as a result.

Rear discharging toilets often cost more than their floor flushing counterparts, and there are fewer alternatives to pick from, which means you will have fewer options in terms of style and color whether you are installing a new unit or replacing an existing one.

Rear discharge toilets are known for being less stable than floor-mounted toilets.

Because they are fastened directly to the wall, they can become loose with time and, in certain situations, must be readjusted on a regular basis.

The one thing you’ll notice about rear outlet toilets is that they flush louder than regular toilets. Because of the force with which the pressured water reaches the toilet bowl, this occurs.

Rear discharge toilets include a lot of unique connections and parts that are not found in floor flush types, and as a result of this extra complexity, rear discharge toilets leak more than floor-mounted counterparts.

Because there are more seals to inspect, diagnosing and repairing these leaks can be more difficult.

The P-trap connector at the rear of the toilet is readily visible from the interior of the bathroom, unlike other sleek and skirted toilets where no plumbing works are visible. Some individuals may find this unsightly.

Installing A Rear Discharge Toilet

One-piece or two-piece rear outlet toilets are available. A one-piece toilet is easy to install, while a two-piece toilet is a bit more difficult. The toilet bowl must be installed first, followed by the toilet tank.

A rear output toilet cannot be fitted directly where a standard toilet was previously built. Because most older toilets have a side flush, you may need to replace the fittings and piping before you put in a rear discharge toilet.

To do this, remove the floor drain pipe before installing the toilet into the wall fitting right behind the toilet bowl.

It is usually advised that you upgrade from a standard toilet to a rear discharge toilet while upgrading your bathroom.

What Are the Best Rear Discharge Toilets?

Signature Hardware Ebler

One feature that I appreciate about this toilet is its small size. Despite the fact that it is an extended toilet, its depth is only 26.5 inches. This makes it an especially smart alternative if you have a tiny bathroom.

Another feature of the Ebler is that it is a vet-designed toilet. It features elaborate design patterns just below the rim and above the base that make it truly stand out.

One of the great things about this toilet is that it is very easy to clean. It features a skirted bowl shape that removes all the nooks and crevices where dirt tends to hide.

Its bowl is also smooth and curvy, which not only improves its overall look but also makes cleaning it a breeze.

As a dual flush toilet, it allows you to use between 0.8 and 1.6 gallons of water per flush. As a result, it complies with the criteria of the EPA’s WaterSense and CalGreen programs and may be marketed in all 50 states.

The toilet bowl is 15.5 inches high, with a seat height of 17 inches. It comes with a toilet seat, so you won’t have to buy one separately.

With this toilet, a P-trap connector will be included. The P-trap connection may be inserted into a 3-inch PVC or attached to any ABS hub or 4-inch PVC fitting. The rough-in is 6.5 inches.


  • High Quality – this toilet will work well for a long time and is reliable, good value for money
  • Easy Installation – it is easy to install this toilet


  • Instructions – even though it is relatively easy to install, it does not come with instructions so some people may struggle.

Toto Aquia Wall-Hung Toilet

Because of its low water use, the Toto Aquia Wall-Hung Toilet is an excellent choice for any style of bathroom.

This floating toilet has a dual-flush technology, which decreases your environmental effect.

The Toto Aquia’s SanaGloss ceramic coating reduces the number of dangerous microorganisms that might stick to the toilet’s surface.

Because they are not attached to the bathroom floor, wall-mounted toilets (see also ‘Wall-Mounted Toilet Problems And How To Fix Them‘) are also incredibly easy to clean.

You can effortlessly mop up the entire area like any other level surface in your bathroom now that you don’t have to deal with that terrible region under your toilet and around the base.

It also has the flexibility to alter the height of the toilet to your tastes, rather than having to settle with the normal toilet height.

Aside from the functional use, the modern design of this wall-mounted toilet will offer your bathroom a sleek and attractive appeal that a normal toilet cannot provide.

It also saves you a lot of money on water consumption, as the bathroom uses about half of the water in your home. And your toilet uses a fourth of that amount of water.

Depending on the age of the toilet, it can use a ridiculous amount of water, with some needing up to five gallons every flush.

The ToTo Aquia consumes just 1.6 gallons of water every flush, in accordance with new Federal guidelines.

And, when you consider that the average toilet is flushed five to six times each day, you can readily see how much this rear discharge toilet will save you money while also helping the environment.

Because the ceramic coating prevents mold and dirt from adhering to its surface, you can clean it with less water and chemicals.


  • Saves Space – the way in which it is mounted is great for saving space in small bathrooms
  • Easy to Clean – since it doesn’t attach to the floor, you can get all around it when cleaning which is much easier. 


  • Price – this rear discharge toilet is more expensive than others so is not the best option if you are on a budget.

Saniflo 023 Sanicompact

This is a great toilet since it appeals to your aesthetics. Because of its white porcelain surface, it is a superior choice for all types of bathrooms.

This self-contained bathroom is appropriate for installation in your house, business, or public restroom.

The small design of this Saniflo model effortlessly accommodates to any size space. As the name implies, the design is quite tiny and can fit into any type of area.

It is designed specifically for tiny places, although you may install it in any room.

This toilet flush’s expanded seat makes it quite comfortable to use since you will have more sitting area.

Unlike traditional toilets, the Sanicompact employs a maceration method to properly dispose of waste.

Instead of disposing of all trash directly into the drainage system, the built-in strong pump aids in garbage grinding.

Because of the maceration system, you may install this Saniflo toilet even if your intended location is not appropriate for putting a toilet.

Another amazing feature of this model is the strong pump that comes included. This pump removes garbage from a distance of five meters vertically and 30 meters horizontally from the sewage pipe.

This toilet is installed differently than others. Although you may install this without undertaking any significant bathroom repairs, it is strongly advised that you contact an expert.

You will need an electrical outlet to connect the pump and a water supply connection to flush the waste away.

Along with the pack, you will receive a non-return valve, which will greatly simplify the installation process.

Because all functions are controlled by a single button, using this toilet flush is exceedingly simple. Simply push the button to adjust the volume of water in the bowl and transfer all waste to the pipe.

Throughout the process, waste is pushed through macerating blades that fully ground it.

This toilet has a tankless system, which is one of its distinguishing features. This tankless technology lets you swiftly shift directions simply by turning the elbow at a 360-degree angle.

The rotation of the elbow allows for installation with any pipe.


  • Compact – the design of this toilet does not take up a lot of space at all.
  • Easy to Install – you do not have to be experienced to understand how this toilet is installed.


  • Expensive – it’s a great toilet but the price tag mirrors this.

American Standard Yorkville

The Yorkville toilet by American Standard is a two-piece single flush elongated and standard height toilet. 

Because this is a pressure-assisted toilet, you can expect a very forceful flush. I have yet to see any that have been blocked from the ones I have seen installed.

It is a bit noisy because it is a pressure-assisted toilet, and it will take some time to get accustomed to it if this is your first pressure-assisted toilet.

This toilet’s design is fantastic. Unlike conventional rear discharge toilets, which have the outlet pipe clearly visible from the bathroom, this toilet is built such that the back of the toilet is flush against the bathroom wall, leaving no exposed pipes.

The Yorkville, like other modern toilets from American Standard, is covered with their unique EverClean surface additive.

This layer prevents mold, mildew, and odor-causing microorganisms from growing. As a result, cleaning this toilet and keeping it in good condition is simple and quick.

This toilet is of regular height. The height of the bowl’s rim is 15 inches. As a result, it is not ADA compliant. As far as comfort goes, this toilet may be a bit disappointing for you. 

It’s also worth noting that this toilet utilizes 1.6 gallons of water every flush. As a result, it is not WaterSense certified and hence cannot be marketed in some parts of the United States, such as California.

This Yorkville does not include a seat. Aside from the seat, you will also need to purchase the installation gear. However, you will receive four color-matched toilet bolt caps. It has a one-year warranty.


  • Surface Additive – this finish prevents mildew and mold.
  • Neat – the design of this toilet allows it to be sleek and tucked away.


  • No seat – you have to buy the toilet seat separately.

What To Consider When Buying A Rear Discharge Toilet


It is critical that you inspect the rough-in of the rear discharge toilet you intend to purchase. The rough-in measurement varies depending on the toilet.

This is especially important if you currently have a rear discharge toilet in your bathroom and wish to replace it. 

A rear discharge toilet’s rough-in is the distance from the finished floor to the center of the outlet pipe. To get an exact measurement, make sure you measure from the finished floor.

The rough-in of a rear discharge toilet differs from a floor outlet toilet in that the measurement rough-in of a floor outlet toilet is from the center of the drainpipe to the rear toilet wall.

If you want to use an upflush toilet as a rear discharge toilet, keep in mind that their rough-in is not the same as a regular rear discharge toilet.


Before purchasing a rear discharge toilet, measure the size of your bathroom, paying special attention to the distance between the wall and the center of the drain pipe.

Based on the measurements you obtain, you will be able to purchase an appropriate rear discharge toilet.

Seat Height

A rear discharge toilet often comes with standard comfort and standard height choices. This indicates the height is greater than 14 inches, with a comfort height between 17 and 19 inches.

This comfortable height will be handier if you have joint problems, are older or taller, or are disabled.

Bowl Shape: The most common toilet bowl forms are elongated and circular.

Depending on your tastes, you may choose the round or elongated bowl over the other. Typically, you should be the bowl form utilized by your previous toilet.


The form and size of your toilet bowl must be considered. You might begin by determining which form best meets the needs of your home.

Elongated form bowls are the greatest option in general since they give appropriate comfort and support and are best suited to male consumers. 

However, in most circumstances, this is not an option due to the amount of space available in the consumer’s bathroom. In small bathrooms, a circular basin can assist conserve floor space.

You now have a grasp of the bowl forms accessible to you, but you must also carefully evaluate the size. 

This refers to how much it protrudes from the wall as well as the total height from floor to rim. Get a measuring tape and learn what the absolute maximum product dimensions are that you can work with.

This will allow you to filter out numerous toilets and focus on the ones you can use.


Because they need separate plumbing, it’s critical to understand whether you’re purchasing a floor-mount or wall-mount rear discharge toilet.

Make certain that the rear discharge toilet you choose is compatible with the bathroom’s plumbing.

Water Usage

A rear discharge toilet will typically consume either 1.28 or 1.6 GPF of water. The full and half flush GPF will be 1.6 or 0.8/0.9 if you buy a dual flush rear flush toilet. 


Some rear discharge toilets just have the toilet bowl and not the toilet flush tank. Always confirm with the vendor that you will receive the tank.

If you do not get a tank, you might have to buy a suitable tank separately, which will increase your costs.


Rear discharge toilets are usually fairly priced and quite easy to find in stores or online. Check the warranty before purchasing the toilet to see what is covered and for how long.


Rear discharge toilets are the best option for anyone looking to install a toilet in an area that is far from the sewer lines or in a bathroom that has no floor drainage. They are cheaper and fast to install.

Rear discharge toilets are not usually in a lot of demand compared to floor outlet toilets and as a result, there are not many of them in the market.

I hope that whichever toilet you choose to buy will work out well for you.

author avatar
Anthony Barnes
Anthony Barnes is the founder of Water Heater Hub and a second-generation plumber by profession. Before developing Water Heater Hub, Anthony Barnes was a full-time plumber, and he has undertaken a wide variety of projects over the decades. As a second-generation plumber, it was easy for Anthony to get used to the technicalities of all from a tender age


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