Best Rear Outlet Toilets Compared

Rear outlet toilets or back outlet toilets are rarer than normal floor mounted toilets but it is still has its uses and are much in demand. Rear outlet toilets are very useful if you can’t tear up your floor or just want something that looks a little bit sleeker. Many apartments require this type of toilets which discharge out of the back to a common wall where all pipes are located.

If you’re looking for the best back outlet toilet or something that will work with a home or apartment with concrete floors, the rear discharge toilets listed in the table below are the best you find in the market. The available range in rear outlet residential toilet models is very limited. However most of them are made by popular and reputed brands and they are as elegant as any normal floor outlet toilet. These models will look great in any space and are able to make your bathroom nice and clean.

Top Rear Outlet Toilet Comparison Chart

ProductNameDimensionsWater ConsumptionPrice
American Standard 3701.001.020 Yorkville Pressure Assisted Elongated Toilet Bowl Only29.75(L) x 14(W) x 15(H) inches1.1/1.6 GPF Tanks
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NIAGARA back flushNIAGARA CONSERVATION N7799 283551 0.8 GPF Stealth Watersense High-Efficiency Elongated Toilet Bowl with Rear Outlet29 x 14 x 18 inches0.8 GPF
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Kohler K-4352-L-0 Anglesey Comfort Height Bowl with Lugs31.5 x 14.9 x 17 inches1.6 GPF
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GERBER PLUMBING 21-975 282800 Maxwell Compact Elongated Ergoheight, Back Outlet Siphon Jet Toilet, Bowl28.1 x 15.4 x 18.2 inches1.28 GPF
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Kohler K-3652-0 Barrington Pressure Lite Toilet with Elongated Bowl28.8 x 21.2 x 29.2 inches1 GPF
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* GPF means “Gallons Per Flush”. US Federal Standards requires all toilets to be 1.6 GPF or less. Old toilets before 1990’s used to have a GPF over 3.5. Today, most regular toilets are 1.6 GPF. Toilets with 1.28 GPF or less are considered, “High Efficiency Toilets.”

As a alternative to installing a rear outlet toilet you can also look into wall mounted toilets. No digging up the floor is required with wall mounted toilets, and they free up the space beneath the toilet bowl for leg room and make it super easy to keep clean. However they are very costly and much more difficult to setup.

Alternative Names for Rear Outlet Toilets

Rear outlet toilets are known by many names. Here are some of the popular names this type of toilets are known by:
* Rear discharge toilet
* Back outlet toilet
* Back flush toilet
* Rear flush toilet

How To Install A Rear Outlet Toilet?

Not many people are familiar with rear discharge toilet plumbing. So one of the frequently asked question about this type of toilets is about how to install it. Connected to this is a related question about the rear outlet toilet rough in size.

If you have the plumbing fittings in place, you can install a back outlet toilet on your own without any specialized plumbing tools. Here are the few steps you will need to follow:

1) Make sure you have everything you need to install and secure the toilet.
* For example, holes on the correct place on the floor to secure the toilet. Place the toilet where it will be installed and check whether the toilet base bolt holes on the ground align. If not mark the location for the bolt holes on the floor and remove the toilet. The take away the toilet and drill mounting holes in the locations marked.)
* Check whether pipe from wall reaches and can lock in place into the outlet on the toilet. If the wall sewer pipe doesn’t reach the toilet bowl outlet you will need a connector to join the two.
2) Then apply silicone grease or place a rear outlet toilet wax ring on the horizontal sewer pipe surface sticking out of the wall. The silicone grease or wax ring will help you slip the toilet bowl into position and seal it to prevent leaks.
3) Move the toilet bowl into position next to the sewer pipe. Press the bowl slowly towards the wall, slipping the sewer pipe into the opening at the back of the bowl. Push it until the bowl locks into place with the pipe.
4) When toilet bowl is securely in place, insert anchor bolts and washers through the mounting holes in the base of the toilet bowl and tighten into the holes on the floor.

Note: If its a two-piece toilet (toilet tank and bowl seperate) then you can attached the toilet tank to the bowl after installing and securing the toilet bowl to the floor. But some people attach the tank and bowl together before moving it into place with the sewer pipe and securing it on to the floor.


Rear outlet toilets or back outlet toilets are rare in residential areas, but not uncommon. Despite the fact that they are less common, there are houses all over country that have rear outlet toilets. But the biggest problem you have with rear outlet toilets is your choices are limited. And not all options will work with the places and aesthetics you maybe looking for. If you are bound and determined to have this kind of a toilet, you may have to alter your original plans to make this toilet a little bit nicer to look.

About Aksam Zarook

Aksam is a web developer, content marketing writer and freelancer. He's applied his knowledge of website creation and content marketing to many clients over the years, ranging from Government Embassies to business websites and developing useful websites like In his spare time, he enjoys reading, working on home improvement projects, and playing with his two adorable kids.

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