Kohler Highline (Arc vs. Curve) Toilet Review & Troubleshooting

The Kohler Highline Arc toilet is one of the most efficient among the various Kohler toilet models. Though it is cheap, it is an amazing two-piece toilet with exceptional features. On the other hand, the Kohler Highline Curve toilet is very easy to install and offers excellent comfort to its users. It can as well match both modern and conventional bathroom designs. But is it worth buying the Kohler Highline Classic? Read this Kohler Highline toilet review to know the details!

Kohler Highline Arc vs. Highline Curve: Quick Comparison

You won’t find too many differences between Kohler Highline Arc vs. Highline Curve toilets.

Design: The main differences exist in their seat type and dimensions. Kohler Highline ARC has an elongated seat, while Kohler Highline Curve has a round seat.

Water Consumption: Kohler Highline Arc and Curve toilets use 1.28 GPF, while Kohler Highline Classic toilets use 1.6 GPF.

ImageHighline Toilets
(Powerful Flush Choice)
Check Price
Kohler K-3493-0 Highline Classic Pressure Lite 1.6 GPF Toilet with Left-Hand Trip Lever. Comfort Height toilet is easier to sit & stand. The installation process is also easy with DryLock technology.
Read Review
(Water Saving Choice)
Check Price
Kohler K-3658-0 Highline Classic Two-Piece Comfort Height Toilet with Left-Hand Trip Lever and Canister Flush Valve. The toilet meets ADA and WatersSense requirements.
Read Review

Kohler is a famous brand in the lavatory field. They offer high-quality bathtubs, sinks, toilets, etc. Also, Kohler toilets are one of the most durable toilet brands on the market. Whether you’re looking for a toilet for your bathroom, public restroom, office, or luxury toilet for your mansion, Kohler has it all. To know more about the Kohler Highline Classic toilets, read on.

These two Highline toilets from the Kohler brand are very popular. And their price mainly depends on the GPF.

Page Contents

Kohler K-3493-0 Highline Classic Pressure Toilet Review

Are you tired of your current toilet because of its poor flushing performance? The Kohler K-3493-0 two-piece toilet is here to give you a new experience. This toilet features a pressure-assisted flushing technology that is great for flushing large waste. The toilet uses 1.6 gallons of water per flush. So, you get to save at least 2,000 gallons of water per year. On top of that, it has a left-hand chrome trip lever and a standard height, which makes it ADA-compliant. Therefore, it can be installed in public restrooms or even at home.

Technical Specifications


Kohler Highline Classic Toilet

Water Consumption:1.6 gallons of water per flush
Flush Rating(Map Test):>=1000 (Highly Recommended)
Material:Ceramic (Vitreous China)
Handle/Lever Placement:Left
Toilet Dimensions:38.2 x 25 x 23.7 inches
Warranty:One-year limited warranty
Price:Kohler Highline Toilet ReviewsCheck Today’s Price

The Kohler Highline classic toilet is well-designed and will match both contemporary and traditional toilets. This one is in white color, but you can also get another color like black, but it’s quite expensive. Also, it has an elongated bowl design that offers comfort due to the extra sitting space. You can also install this unit on your own as it has a standard 12-inch rough-in and comes with bolts ready to install. You will only need a toilet seat, wax ring, and the supply line, as they are not included in the purchase. Otherwise, this excellent toilet will serve you for a very long while.


  • Kohler Highline classic toilet uses a pressure-assisted flushing system
  • It is very comfortable as it has an elongated toilet bowl
  • Sitting down and standing up is easier for most adults
  • The toilet is of a standard height and very easy to sit on or stand up
  • The trip-lever is located on the left-hand side, making be ADA compliant
  • It only uses 1.6 gallons per flush, which enables you to save a lot of water every year
  • It is very easy to install as it comes with a 12 inches rough-in and bolts
  • The manufacturer offers a one-year limited warranty


  • There is no seat cover, supply line, or wax ring included in the purchase
  • This floor-mounted toilet is not WaterSense certified and will not be accepted in some states like California

Kohler K-3658-0 Highline Class 5 Toilet

This toilet model is placed 2nd in our popular Kohler Highline classic toilet reviews article. As sleek and compact as this toilet looks, the Kohler K-3658-0 elongated toilet is a great addition to any bathroom. The traditional white color can match any bathroom décor, but you can choose other colors like black, biscuit, etc. Just know that other colors are slightly more costly than white. The toilet features one of the most powerful flushing systems, which is the class five flushing technology. This technology offers great bulk waste flushing, leaving the bowl clean after every flush. So, cleaning is made easy.

Related: Difference Between Kohler Highline and Cimarron Toilet

You can install this toilet in any state as it has a standard 12-inch rough-in and uses only 1.28 gallons of water per flush. With such water usage, this toilet will enable you to save at least 16,500 gallons of water per year. And if you live in states where they provide discounts for installing a WaterSense-certified toilet, this will benefit you. Cleaning is easy, and you can do so twice a week, as the flushing mechanism does the work most of the time.

Technical Specifications


K 36580 Highline Class 5 Toilet

Water Consumption:1.28 GPF
Flush Rating(MAP Test):>=1000 (Highly Recommended)
Included Components:toilet
Flush Type:Water-Saving Toilets
Warranty:One-year full warranty
Price:kohler highline classic toiletsCheck Today’s Price

After every flush, the canister flush valve offers smooth flushing actuation with consistent water usage. Furthermore, the toilet is ADA-compliant, with a chrome lever on the left side and a standard toilet seat height. The elongated bowl design offers comfort as it is spacious enough. With these features, this is considered a high-efficiency toilet, and you will gladly use it. You will have a lower water bill but high performance all the time.


  • This toilet is WaterSense certified as it only uses 1.28 GPF.
  • It has an elongated bowl which provides extra space for added comfort to different users
  • Class 5 flushing technology generates enough rinsing power for a clean bowl.
  • The toilet is of a standard height when the seat is included and easy to use
  • It features a chrome trip-lever based on the left-hand of the toilet, making it ADA-compliant (offers chair-height seating)
  • It uses the powerful class five flushing technology that clears large wastes easily
  • Enjoy the virtually plug-free performance.
  • The manufacturer provides a one-year limited warranty
  • Installation is made easy as it comes ready with bolts and a standard 12-inch rough-in


  • The elongated slow-close toilet seat and supply line are not included in the purchase
  • The toilet is not very silent as it makes some noise while refilling the tank and when flushing

Common Kohler Highline Toilet Problems & Fixes

My Kohler Highline Toilet Flushes Slowly: Fixed

Ensure the water level in the tank matches the water line.

My Kohler Highline Toilet Flush Is Not Working: Fixed

The main reason behind this no-flushing issue is a damaged flush valve or trip lever. But before replacing it, remove and reconnect the flapper chain to the flush valve and check if it works again. Also, remove the excessive slack.

My Kohler Highline Toilet Keeps Running: Fixed

First, check if the tank water level is correct or not. Remove the excessive slack from the flapper chain and adjust it correctly. Then clean the flapper and flush the valve seal. If it is damaged, replace the flush valve.

My Kohler Highline Toilet is Not Filling Quickly: Fixed

The problem is with the toilet shut-off valve. There might be dirt or blockages. So open it and clean the valve head, inlet, and water supply line.

My Kohler Highline Toilet Makes a Noise: Fixed

The water pressure is too high. So shut off the valve and adjust the water pressure.

Kohler Highline vs. Elliston vs. Elmbrook

Kohler Highline Kohler EllistonKohler Elmbrook
Water Usage: 1.28 GPF
Rough-In: 10”, 12”, or 14”
Flushing Class: 5
Dual Flush: No
Design: 2-piece
Bowl Height: 16.5”
Total Height: 31”
Handle Location: Left
Warranty: 1 year
Toilet Style: 2-piece
Height: 30.5”
Depth: 30”
Bowl Style: Elongated
Flush Type: Gravity
Flush Power: 1.28 GPF
Seat Included: Yes
Seat Fixing: Quick Release
Flush Mechanism: Lever
Flush Side: Left
WaterSense: Yes
Flush Type: Gravity Fed
Toilet Type: Two-Piece
Trip Lever Location: Left Front
Dual Flush: No
Water Usage: 1.8 GPF

Bottom line

When buying a toilet, there are several things that a person should consider. For instance, the flushing capacity, height, bowl design, ease of installation, ease of cleaning, and durability. These factors will help you choose a toilet that lasts longer and performs well. However, after deciding on the features, select a color that compliments your bathroom décor. The units we’ve discussed above are some of the best, and you will not be disappointed. So, That’s it from this Kohler Highline toilet reviews post. And I Wish you all the best as you pick your next toilet!


Q. Can I install the Kohler Highline Toilet by myself?
Ans. Of course, the Kohler Highline unit is just like any other standard toilet on the market with a 12-inch rough-in. The only challenge is that you will have to purchase a toilet seat and the supply line. But the rest is easy as you will have to follow the instructions in the user’s manual.

Q. What features will I get from acquiring the Kohler Highline Toilets?
Ans. This is an excellently designed toilet with outstanding features. The Kohler Highline design toilet offers an elongated bowl design. It is also a two-piece toilet and has powerful flushing technology. The toilet has a chrome trip lever located on the left side of the toilet. You can choose either a toilet model with 1.28 GPF or 1.6 GPF. The toilet seat is of a standard height and thus very comfortable.

Q. Which one is better – 1.6 GPF or 1.28 GPF?
Ans. If you live in places with strict water regulations, such as requiring all households to use a toilet with 1.28 GPF, then you are better off having such a toilet. This will help you save a lot of water and even get rebates in some municipalities. At the same time, you will be conserving the environment. So, the 1.28 GPF toilet is better if it has a very efficient flushing system.

We are really lucky to have a hard-working, multi-skilled plumber on our team. Collin D. Gallegos, a professional plumber who has worked with us since 2012, is an expert in vent, septic, and drainage systems. He is a Certified Master Plumber and has worked on various commercial plumbing projects. He usually helps our readers resolve plumbing and pipe-related issues with a proper DIY troubleshooting and repair guide.

1 Comment

  1. I just finished replacing 2 old toilets with 2 kohlers. 1 elongated 1 round Highline. Did it myself. Very easy. Online purchase. Very happy excellent product.

Leave A Reply

Please enter your comment!
Please enter your name here