Best No-Clog Toilets: Reviews & Buying Guide

Best No-Clog Toilets: Reviews & Buying Guide

Unclogging the toilet is no easy task and can result in a lot of effort and lost neural cells. And if you experience toilet blockages regularly, it’s probably best to replace your current unit with the one that doesn’t clog.

But how do you find the right one?

Well, trust us!

We’ve armed ourselves with expertise and picked the four best no-clog toilets for any occasion and budget. So, scroll down and pick the one you like most!

Quick Picks

Editor’s Choice

2nd Best Choice — Best Pressure-Assisted Uncloggable Toilet

3rd Best Choice — Best No-Clog Toilet for Small Bathrooms

American Standard 2034314.222 Champion-4Signature Hardware 413995 StalnakerEAGO TB351 Dual Flush Eco-Friendly Toilet
  • 4’’ flush valve and 4’’ wide trapway;
  • comes in Normal and Right height
  • pressure-assisted flush for better efficiency;
  • ADA compliant
  • 3’’ flush valve;
  • dual flush system (0.8 GPF/1.6 GPF) helps preserve water

What Makes a No-Clog Toilet?

Before we dive in, there’s one thing you should know:

Clogs are the most common toilet problem. And at some point, you may face clogging with every toilet.

Your exploitation might not always be the cause of blockages because it has many causes, but you may still have to deal with the consequences.

However, some features make the toilet less likely to clog.

Wide Trapway

A trapway is a curved tube in the lower part of the unit. It holds the standing water and keeps the sewer gasses from entering your bathroom. Drain clogs occur when the trapway is blocked by something, and it’s the majority of all blockages that you may encounter throughout the toilet’s lifetime. 

Trapways come in different widths. The most common is a 2.25’’-2.5’’ trapway, but if you want something for a clog-free performance, it’s better to choose a commode with a 3’’ or even 4’’ trapway: it can flush bulk waste without causing a backflow. 

Also, you may want to look at the unit with a fully glazed trapway. A glossy finish prevents the waste from adhering and speeds up flushing, thus making blockages less likely to occur.

Pressure-Assisted Flush

If you want a long-lasting toilet that doesn’t clog, go for the pressure-assisted flush over the gravity flush. Pressure-assisted units have a plastic pressure tank filled with air. When the water fills this tank during a refill cycle, the air in the tank becomes compressed. Then, when the flush is triggered, the tank releases the water under pressure — this is similar to blowing the air through a straw — and blasts it into the bowl. Pressure-assisted toilets tend to flush water 50% farther than gravity-fed systems, which results in cleaner pipes and lesser chances of clogging (1). 

Fast Refill

If the clog in the drain occurs nevertheless, one of the fast and efficient ways to remove it is to soak the clog with water that will break it down into smaller parts. To do this, you need to perform multiple flushing within a short period and may need a commode with a fast-refilling tank.

Our Best No-Clog Toilets

Best Overall — Editor’s Choice

American Standard 2034314.222 Champion-4
  • 4-inch wide trapway eliminates any chances of clogging;
  • EverClean bowl surface prevents the waste from adhering;
  • comes in the right height, which is compliant with ADA;
  • an elongated bowl provides more leg space;
  • includes a slow-close seat.
American Standard 2034314.222 Champion-4

Let’s start our review of the best no-clog toilets with the top performer, which is the Champion-4 by American Standard. ‘4’ in the name stands for the 4-inch flush valve and 4-inch fully glazed trapway, which is the widest in the segment and can move up to 70% larger load than a standard toilet.

Also, the Champion series utilizes the siphon action technology that holds some amount of water and uses it to optimize waste passage when the flush is triggered. Top it with an EverClean bowl that prevents the waste from adhering, and you get a clog-free performance every time!

This American Standard unit uses 1.6 gallons of water per flush and features a quiet and powerful piston flush valve that ensures efficient solid waste discard with less water. Plus, it features a soft-close seat that prevents slamming and contributes to a noise-free household.

Aside from that, the Champion comes in the Standard (15 inches) and Right (17 inches) height and is compliant with ADA, so you can install it in households with senior users or people with mobility issues.


  • A wide and fully-glazed trapway prevents clogging even when flushing a large load
  • Quiet operation thanks to a gravity flush and soft-close seat
  • Comes in a Comfort and Standard height, so it can fit into any household


  • The flush is pretty powerful and can accidentally splash you if you don’t close the lid
  • Cannot be shipped in Texas and California

Best Pressure-Assisted Uncloggable Toilet

Signature Hardware 413995 Stalnaker
  • uses pressurized air to create an efficient flush;
  • elongated bowl for more comfort suits tall users;
  • ADA compliant — the bowl height is 18.25 inches;
  • includes a soft-close seat;
  • 1.6 gallons per flush.
Signature Hardware 413995 Stalnaker

If you’re looking for pressure-assisted toilets that don’t clog, we recommend that you take a look at the Stalnaker unit by Signature Hardware. This 1.6-gallon toilet easily eliminates bulk waste and stays clean thanks to a glossy porcelain surface.

Another good feature about the Stalnaker is that it’s compliant with ADA. The bowl is 18.25 inches high without a seat and meets the regulations, so this toilet will be equally comfortable for average people and those who need accessible appliances. The elongated bowl is also more comfortable to sit on, especially for taller people.

Finally, the Stalnaker is easy to install thanks to its two-piece design and comes with a soft close seat that contributes to quiet performance. Its classic design without extra features and crevices will suit any bathroom interior.


  • Pressure-assisted flush ensures clog-free waste passage with only 1.6 gallons per use
  • The seat is made of durable polypropylene and doesn’t slam against the bowl
  • The porcelain prevents the waste from adhering and helps maintain a cleaner look


  • A pressure-assisted flush tends to be noisier than a gravity flush
  • May not fit into a smaller bathroom

Best No-Clog Toilet for Small Bathrooms

EAGO TB351 Dual Flush Eco-Friendly Toilet
  • 3’’ flush valve triggers powerful flow and prevents clogging;
  • dual flush: 0.8 GPF for liquids, 1.6 GPF for solids;
  • siphon jet locks the odors and makes the flush more efficient;
  • includes a soft-closing seat with the lid;
  • a compact one-piece design is ideal for small bathrooms.

This small unit by EAGO easily proves that one of the best no-clog toilets can fit into the tiniest bathroom and ensure a worry-free experience. Aside from the compact design, the TB351 loo also features a dual-flush system and comes with a soft-closing seat for quiet performance.

So, the EAGO unit is WaterSense certified and helps you reduce water consumption by choosing a 0.8-gallon flush for liquids, and a 1.6-gallon flush for solids. Aside from that, it has a 3-inch flush valve and a large siphon that optimizes the waste passage even for large loads.

Also, the EAGO comes in a one-piece design and has a concealed trapway, so you will spend less time cleaning all the crevices. The bowl itself has a glossy finish and is protected with a 5-year warranty against cracks and stains.


  • WaterSense certified and helps you conserve water with the dual flush
  • Minimalistic design is easy to clean and maintain
  • Quiet operation thanks to the gravity flush


  • The hinges on the seat may break pretty fast
  • Some users report tank leaks within the first couple of years

Best Comfort Height No-Clog Toilet

American Standard 2961A104SC.020 Colony
  • 16.5’’ bowl height is suitable for most users;
  • uses 1.28 gallons per flush;
  • elongated bowl feels more comfortable;
  • compact design will easily fit into small bathrooms;
  • includes all the hardware needed for installation.
American Standard 2961A104SC.020 Colony

Our final contestant for this selection of the best no-clog toilets is the Colony unit by American Standard. This sleek one-piece toilet meets strict WaterSense and ADA regulations and can suit most users and fit into most bathrooms!

The Colony is a single-flush toilet and uses 1.28 gallons per flush, which can save you more than $110 per year in water costs, according to WaterSense. Plus, the Colony features a 3-inch flush valve to create a low flow that efficiently scrubs the bowl clean, and a siphon jet action to optimize waste passage. 

The bowl is 16.5 inches high, and if you put a seat atop, you will get the minimum 17 inches required by the ADA. Thus, if you live with a person who needs proper access to the sanitary fixtures due to their mobility issues, this model will be a good pick for you.

Finally, this unit is pretty quiet, because of the gravity flush and a soft-close seat. It doesn’t produce virtually any unnecessary sounds and contributes to a quiet household.


  • WaterSense certified and saves up to 20% of water compared to 1.6-gallon units
  • The bowl height makes the toilet accessible for certain groups of people
  • Operates quietly


  • The trapway is exposed, which means that cleaning may take some time
  • Some users report that the flush valve is prone to leaks

Important Checks to Make When Choosing a Toilet That Doesn’t Clog 

Single Flush or Dual Flush

The US Environmental Protection Agency suggests that all the units installed after 1994 should use 1.6 gallons of water per flush to conserve water.

Thankfully, many modern commodes are even more water-efficient, as they use 1.4 or 1.28 gallons per flush. 

Or, you can go for a dual-flush system that regulates the water use depending on the type of waste and has a partial (0.8-1.0GPF) and full (1.28-1.6 GPF) flush. Since almost half of the household water consumption is bathroom needs, a dual-flush toilet can result in significant savings over the year in water bills.

One-Piece or Two-Piece

One-piece toilets combine the bowl and water tank into a single unit. They are usually more compact and easier to install and maintain since there are no gaps between the bowl and the tank where the dirt may go.

However, these units tend to be heavier and more expensive than a two-piece, which may be a drawback for some.

Two-piece toilets have the bowl and the tank separated, which results in a lesser weight and price because they’re easier to mold. Also, two-piece units tend to be higher than single-piece because of the small gap between the tank and the bowl.

The same gap, though, makes the unit more difficult to clean and more prone to leaks, since the water supply pipe is exposed to external factors. Plus, manufacturers often ship two-piece toilets as separate orders, which can stretch the installation process in time.

Bowl Height and Shape

Toilets can have a round or elongated bowl, and while users consider oblong bowls more comfortable, they often make the toilet more than 31’’ deep (rough-in included), which is not a perfect choice for smaller bathrooms (2). Round bowls run 2-3 inches shorter than elongated and are more advisable for limited floor space.

As for the height, you can pick up either a Standard 15-inch high bowl or a Comfort height bowl that runs two inches higher. ADA compliant toilet bowls can go up to 19 inches and are a preferable choice for those who share a home with a senior or disabled person.

Trapway Curve

An overly long and curved trapway can drop the velocity of the flushing water, resulting in a less efficient flush. If you look for models with an exposed trapway, be sure to choose a unit that doesn’t have 90-degree parts — this is where the flushing water is more likely to cause a backflow.


You can find a lot of uncloggable toilets for any budget and taste in most modern brands. Just be sure to look for a powerful flush and at least a 3’’ wide glazed trapway.

The most common reason behind clogs is flushing a non-flushable object, such as thick toilet paper, baby wipes, hygienic products — down the drain. Also, the blockage can occur in the house sewer pipe or vent drain (toilets, especially those with a pressure-assisted flush, use the pressure from vents drains to boost the flow).

If the plunger didn’t work, you can use the plumbing snake to reach deeper into the trapway or pipe. Rotate the snake to break down the clog and then flush it down the drain. Other methods include soaking the clog with hot water, using dish soap, or soda and vinegar solution to break down the parts.

Slow flushing might be the result of low pressure in the supply line or a leaking tank. Or, it could be a block down the drain that slowly builds up, and in this case, you may need a plumbing snake or pipe cleaning chemicals to deal with it.

The most efficient way is to contact your local plumber and schedule the regular drain cleaning. Or, if you prefer DIY methods, you may flush the toilet with hot water, while you’re cleaning it. Also, there are strong cleaning chemicals, such as lye or hydrochloric acid which can also be used once in a while with the correspondent precautions. Finally, don’t wash wipes, toiletries, or hygienic products down the drain.

Owner - Mary O. Frazier


Mary O. Frazier

Mary O. Frazier — lead author of our website, connoisseur of interior design and plumbing. I will tell you the most interesting and important facts about household items. She reads a lot, plays chess and collects useful information for you. You can read more about her here.

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