Kohler Class 5 vs. Class 6 Toilet: Key Features And Differences

Are you sick of your damaged toilet?

We all have been there. Let me share with you my experience. Some days back, I was looking for a good toilet. My previous toilet has been damaged for a long time.

Do you know what I have tired of hearing?

Most people suggested Kohler class 5 and class 6. It was confusing to choose one. After that, I have researched Kohler class 5 vs. class 6. I am trying to share my experience. It may help you to choose the best one. 

A Quick Comparison Table

SpecificationsKohler Class 5Kohler Class 6
Water pressureDecentBetter
InstallationComplicated Easy
Leakage preventionSimpleUpgraded
PriceLower than class 6Normal

Differences Between Kohler Class 5 And Class 6 Toilet

Though both of the technologies of these flushing toilets are similar, there are some differences. Here you will know about the differences between Kohler class 5 and class 6. So, let’s begin. 

  • Water pressure 
Kohler Class 5 Toilet
Kohler Class 5 Toilet

If you buy a toilet tank, you will need better water pressure. Because without water pressure, your toilet will work slowly. 

In the case of water pressure, class 6 comes up with more high-quality technology than class 5. You will get flawless water pressure in class 6. 

Though class 5 offers good water pressure, class 6 is the improved version of class 5.

So, there is a slight difference in water pressure on both technologies. 

  • Performance 

Class 5 and Class 6 have similar qualities. Both technologies are made of the same materials. One of the significant differences between class 5 and class 6 is the performance. 

Class 6 provides top-notch performance. It offers 100 percent bowl cleaning capacity. Also, it helps to save water.

Along with that, customers appreciated the upgraded performance of class 6. But one thing is for sure; it ensures durability. 

Class 5 also has a good performance. But not more than class 6. If you compare the performance, class 6 offers better performance than class 5. 

  • Features 

As I have mentioned earlier, class 6 provides some improvised features. Moreover, you won’t find them in class 5. 

But hang on a minute. Is there anything missing from class 5? No, the features of both technologies are quite parallel. Some features are improved in class 6. 

Kohler manufactures class 6 with well-organized features. Let me say this straight, and there are no noticeable changes in the features of class 5 and class 6. 

  • Diameter
Kohler Class 6 Toilet
Kohler Class 6 Toilet

Class 5 comes up with a large diameter than class 6. So, it is a noteworthy difference between class 5 and class 6. Isn’t it? 

Yeah. It is. Moreover, class 5 offers 3.25 inches diameter. Fact: it is bigger than the traditional flush systems.

Also, class 6 provides a small diameter than class 5. 

You are thinking about the importance of diameter. Right? I know it’s normal.

Does diameter matter?

To some extent, yes, it matters. 

It’s up to you. If you want a flush technology with a big diameter, then you can choose class 5.

Or, if you are okay with regular diameter, class 6 can be good for you. 

  • Installation 

Installing a flush system can be tough for you if you have never replaced it. In that case, I will recommend consulting a plumber. 

Otherwise, you can also install the flush system following instructions. To install Kohler class 5 technology, you have to remember that it has a larger diameter than the standard flush system.

You need to check the compatibility of the flush system with your toilet as well. Class 6 is compatible with all toilets because it is similar to conventional flush systems. 

  • Leakage prevention

The Kohler class 6 can prevent leakage better than class 5. You may wonder why? Because it has a quick installation process that prevents leakage. 

It is also one of the important features of the flush system. On the other hand, class 5 has a complicated installation. So, it will be tough to get rid of leakage. 

  • Efficiency  

Comparatively, class 6 provides 100 percent latest technology with high efficiency. So, it is evident that the class 6 flush system will be more effective than the class 5. 

Also, class 6 offers fast water jet implementation. It won’t allow you to waste even one drop of water. 

Surprisingly enough, both flushing technologies will make your work easier. So you don’t have to worry about the effectiveness of class 5 or class 6. 

  • Price  

If you compare the price range of class 5 and class 6, you will find a slight difference. Does it matter or not? It depends on your budget. 

You need to invest some extra bucks for purchasing Kohler class 6 flushing technology. I guess it won’t disappoint you at all. 

Which One Is The Best?

At this point, I can say both flushing technologies can be great because of their features, performance, and durability. 

According to the comparison, Kohler class 6 is better than class 5. You will get some modern technology in the class 6 toilet. 

But still, you can’t deny the diameter and flushing capacity of class 5. The choice is yours. You can choose any of these toilets. 

Choosing any one of these toilets will be beneficial for you. 

Frequently Asked Questions (FAQs)

What is a Kohler Class 6 toilet?

The Kohler class 6 toilet is a new age flushing technology. It comes up with extreme jet action power. Also, it can clear the debris and control the water pressure.
Flushing water will go into the rim. So, you don’t have to worry about water wastage. It keeps your toilet bowl clean. 

What is Kohler Class 5 flushing system?

The Kohler class 5 flushing system offers self-cleaning capacity. Do you know what’s special? It has low water flow feature. 
Along with that, class 5 provides a wide flush valve. The class 5 flushing technology can protect your toilet from leakage and clean up the blockage. 

How do I know if I have a class 5 toilet?

If your flush valve has a bigger diameter, it is a class 5 toilet because no other flush valves have a larger diameter.
Another way to identify the class 5 toilet is you have to look into its flush sound. If you get the less flush sound, you have to understand it is a class 5 toilet. 

What toilet is best?

According to experts, the Kohler toilet can be the best choice for you because it has been made of robust materials. Customers are suggesting the Kohler toilet for its stability. 
Along with that, it will last for 10-15 years. Also, you will find any toilet.      


After all, I hope you understand the differences between Kohler’s class 5 and class 6 toilets. Despite having some differences, there are many similarities as well. If you have noticed your Kohler toilet is leaking.

Before doing anything else, you must check the fill valve and flush system. 

Call a plumber to fix it immediately. A good flush technology can change the whole toilet system. For ensuring better hygiene, you have to choose a better flushing technology. That’s it. Take care.

Clyde Mitchell

I run a hardware store nearby Court Anaheim, CA. Over the last 7 years, I have been blogging about home improvement and yes, I own ReliefInBath.com From me and this website, you can expect some useful tips on great ideas for a modern bathroom.

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