Review of the Kohler San Souci (Sleek & Modern) Toilet

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Kohler is known worldwide for its high-quality products with unique and incredible designs that ensure both comfort and optimal support.

The one-piece Kohler San Souci toilet is a sleek and modern option, that will fit right into your modern bathroom design.

Keep reading for a detailed review of this low-profile, modern toilet options!

Review of the Kohler San Souci Toilet (2022)

Kohler San Souci toilet reviewed

Key Features
  •  Flush Score:   800 MaP
  • Water Consumption: 1.28 GPF
  • Bowl Shape: Elongated
  • Flushing System:  AquaPiston 360° Gravity Flush
  • Flush Type: Single
  • Style: One-Piece
  • Dimensions : Toilet (27.87″ x 16.37″ x 25.31″), Rough-in (12″), Trapway (2.12″), Seat Height (17.25″)
    See image with toilet dimensions
    KOHLER K-5172-0 San Souci dimensions

Seat Options

  • K-75796 Cachet® Nightlight Quiet-Close™
  • K-4108 C³®-230 bidet

Product Documentation

Positive Comments
  • EPA WaterSense certified
  • Low-profile tank and sleek design
  • Consumes only 1.28 gallons per flush
Negative Comments
  • Purchase doesn’t include a supply line for installation

Summary of Recent Reviews

Buyers are raving over the compact, yet powerful toilet.  The design is modern, and while it’s compact, it’s still a comfortable user experience.  The flush is efficient, leading to a clean bowl after use.  “Looks great and flushes do the job with very little water.”


KOHLER San Souci K-4007-0 specs Main Features and Highlights

Below we discuss 6 main features of the San Souci toilet.

Modern Design

With its sleek design, the San Souci stands out among its competitors. The low-profile tank combined with the comfort height makes this toilet a perfect choice. Further, the elongated bowl provides more space for your legs and ensures superior comfort.

Water-Efficient Flushing

The Kohler San Souci, a water-efficient toilet that promises to help save 16,500 gallons of water per year, is both eco and budget-friendly. For people who are serious about saving the planet, using a toilet that doesn’t waste water is an ideal option.

This model only consumes 1.28 gallons per flush, which is significantly less than older models. Further, even with less water consumption, flushing performance isn’t sacrificed. This model provides fast and powerful flushes to remove waste entirely in one single flush.

Additional Features

The flushing tank of the San Souci includes a standard left-hand trip lever for a smooth and effortless flushing operation. Since the toilet is EPA WaterSense certified, you may benefit from customer rebates on your water bills.

The concealed trapway design makes sure that the toilet removes all waste. Finally, this model comes with a quiet-close, grip-tight toilet seat that prevents accidental slamming or other loud noise when closing the seat.

K-4007-0 San Souci modern toilet installed


Surface coating is one of the most important things a toilet should feature when it comes to maintenance. If a toilet doesn’t feature any type of coating, waste will likely stick to the surface of the bowl after use, a nightmare for any cleaner.

Therefore, most toilet manufacturers nowadays place a coating or glaze layer over the surface of the bowl. Depending on the manufacturer, the coating could have different names. Some of the most common options you’ll find are CleanCoat, CEFIONTECT, WonderGliss, EverClean, and SanaGloss, all of which promise a more hygienic toilet compared to non-coated options.


Another important factor to consider when getting a new toilet is its durability. If a toilet is made out of cheap, low-quality materials, it is more likely to break or crack. Luckily, the San Souci toilet is made out of vitreous china, which is known to be one of the most durable materials for toilets. Thanks to the sturdy construction, you can expect the toilet to last at least 10 years. Further, this model also features a very durable trip lever. 

Color Variety

Aside from comfort and efficiency, looks are also a very significant factor when it comes to toilets. As the toilet you are planning to buy will probably stay in the bathroom for at least a decade, you must ensure that it looks good and blends in your bathroom style. Fortunately, with the Kohler San Souci you won’t have to worry too much about finding the right fit.  

Not only is the design of this toilet sleek and minimalistic, but it is also available in a wide variety of colors. The most common option you will find is the almond color. Additionally, it is available in cashmere, biscuit, black, ice gray, dune, sandbar, and even thunder grey. With so many options, the San Souci will easily blend in with any bathroom decor. 

San Souci vs. Wellworth (Compared)

The Kohler San Souci is undoubtedly one of the best toilets in its class. The Wellworth, on the other hand, is also a very popular choice nowadays. Therefore, we have decided to compare some of the key features these two toilets have to offer:

  • Toilet Construction

    First off, the main and most noticeable difference we can see is the type of construction. The Kohler Wellworth, unlike the San Souci, has a two-piece construction. It is a traditional type of construction and some people may even find it more reliable. However, two-piece toilets are also more difficult to clean and maintain due to their multiple parts.

  • Water Consumption

    The second differentiating feature is related to water efficiency. The Wellworth toilet consumes 1.6 gallons-per-flush while the San Souci consumes only 1.28 gallons per flush. Although the Wellworth offers a more powerful flush, the San Souci makes a better choice if water efficiency is more important to you. 

  • User Protection

    Finally, both these models come with a 1-year limited warranty, which is a standard nowadays. 

Installation Guide

The Kohler San Souci comes with a standard 12-inch rough-in for installation. You may need a plumber to set up the toilet if you are not a do-it-yourself person. Furthermore, as a one-piece toilet, the entire unit is heavier than two-piece toilet models, making it hard to install without any help.

Finally, the toilet’s supply line doesn’t come with the package, so you will have to purchase one separately.

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