Item # bci2724514

The Kohler K-4000/K4108 has been discontinued

** See similar or replacement items below **

Kohler San Souci 1.28 GPF Elongated Comfort Height Toilet with Touchless Flush and C3 230 Slim Elongated Bidet Seat with Touchscreen Remote and NightLight Technology

Model: K-4000/K4108

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Product Overview

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San Souci

San Souci one-piece toilet offers a sleek, contemporary design combined with Kohler touchless flush. Just hold your hand over the tank sensor to activate the flush. No handle to touch means fewer germs to pick up or leave behind. This toilet features innovative AquaPiston technology, a patented flush engine that delivers a fast, powerful, and virtually plug-free flush. A 1.28-gallon flush provides significant water savings of up to 16,500 gallons per year, compared to a 3.5-gallon toilet, without sacrificing performance.

C3 230 toilet seat brings you the freshness of bidet cleansing in a slim, low-profile design made to fit most elongated toilets. This heated bidet seat comes with an easy-to-use touchscreen remote that allows you to adjust and set all your personal preferences, from water temperature and pressure to seat temperature and air-drying. A built-in night-light provides illumination of the bowl, and the self-cleaning stainless steel wand uses UV light for automatic sanitizing. Lifestyle

Product Features:

  • One-piece configuration provides a uniform look and simplifies installation
  • Elongated bowl offers a modern and comfortable look and feel, extending out an extra 1-1/2" compared to a round configuration
  • Covered under Kohler's one-year limited warranty
  • Offers a sleek, low-profile design with a compact elongated bowl
  • Touchless operation (powered by an electromagnetic sensor) means fewer germs both picked up and left behind
  • Constructed of durable and easy to clean vitreous china
  • Installs in a floor-mounted configuration
  • Touchless siphon jet system with AquaPiston technology provides a high-efficiency, low-consumption, extremely hygienic flush
  • ADA compliant - complies with the standards for toilets set forth by the Americans with Disabilities Act
  • Comfort Height - designed for ease of use, with a higher than average bowl
  • WaterSense certified - toilet uses 20% less water than the current standard while still maintaining superior performance
  • Concealed trapway - a built in skirt hides the discharge passageway from view, for a smoother, less utilitarian appearance
  • Includes a soft close seat with cover
  • Touchless module powered by 4 AA batteries (included)

Toilet Seat Features:

  • Elongated Bidet seat with lid - designed to complement a wide variety of elongated toilet designs
  • Includes a touchscreen remote control with two programmable user presets
  • Anterior and posterior nozzles provide warm, aerated water for cleaning
  • Water temperature and pressure adjustable
  • Two spray functions available: oscillating or pulsating
  • Features a stainless steel self-cleaning wand with UV light for automatic sanitizing
  • Carbon filter included for odor control
  • Warm air drying system - air speed and temperature adjustable
  • Heated seat with five temperature settings
  • Automatic LED night light illuminates the bowl for convenience
  • Seat and lid constructed of durable, easy to clean plastic - resists stains, mold, mildew, and odor-causing bacteria
  • Seat is ergonomically contoured to provide maximum comfort to the user
  • Includes an anti-microbial agent that inhibits the growth of molds, mildews, and odor-causing bacteria
  • Complete with color-matched soft close hinges
  • Secure mounting assembly and quick installation process

Toilet Technologies / Benefits:

  • Touchless: Kohler Touchless toilets are the ideal no-touch flush solution - no handle means no germs either picked up or left behind. The touchless module projects an electromagnetic field through the lid of the tank, which activates the flush when a hand is placed above.
  • AquaPiston: AquaPiston canisters allow water to flow into the bowl from all sides, increasing a flushing system's power and efficiency.
  • Comfort Height: Comfort Height toilets offer the greatest accessibility and ease of use with a bowl height of between 16-1/2" and 18", the same as a standard chair.
  • WaterSense Certified Product: To help make a difference on a global scale and to further its role as an industry leader in eco-performance practices, Kohler has established partnerships with a number of environmental organizations, including WaterSense. Many Kohler faucets and toilets are equipped with low-flow technology - they use less water, while continuing to meet superior performance standards.
  • Low-Profile Bolt Caps: Offer a more sleek appearance, replacing the standard gum-drop style bolt caps. Also much easier to clean around.

Toilet Seat Technologies / Benefits:

  • Quiet-Close: A quiet close seat or lid forces a gentle descent, guaranteeing that your seat will never slam as you put it down.
  • Quick-Release: This simple yet innovative technology from Kohler allows the seat to be unlatched from the toilet for easy removal and convenient cleaning, no tools required. Simply pop open the caps and gently pull the seat forward, and you are ready for that detailed cleaning job that has been so difficult in the past.
  • Nightlight: Kohler Nightlight technology allows you to safely locate your toilet without any need to turn on a light. Dual LED lighting includes a guide light on an automatic 7-hour illumination cycle, so you can see your toilet in the dark, and a task light that illuminates the bowl whenever the lid is lifted.
  • Bidet Seats: This innovative technology cleanses the body privately and comfortably. A warm stream of fresh water is emitted from anti-microbial plastic wants. After use the nozzle retracts, it is automatically cleaned with a fresh water rinse. Bidet seats provide the ideal coupling of the good hygiene you want and the privacy you need.

Product Specifications:

  • Overall Height: 25-5/16" (measured from bottom of base to top of tank)
  • Overall Depth: 27-3/4" (measured from back of tank to front of rim)
  • Overall Width: 16-3/8" (measured from rightmost to leftmost edge of toilet)
  • Bowl Height: 16-1/2" (measured from floor to bowl rim)
  • Flow Rate: 1.28 GPF (gallons per flush)
  • Water Area: 10-3/4" x 7-1/2" (inner rim dimensions of bowl, length x width)
  • Water Depth (from Rim): 5-3/8"
  • Tank Width: 16-3/8" (measured from leftmost to rightmost edge of tank)
  • Tank Length: 6-15/16" (measured from back edge to front edge of tank)
  • Trapway (Discharge Passageway) Size: 2-1/8"
  • Distance Between Toilet Seat Installation Holes: 5-1/2"
  • Rough-In: 12"


This product is listed under the following manufacturer number(s):

*Denotes a finish or option that has been discontinued.

Dimensions and Measurements

Bowl Height
16.5 in.
Center to Center
5.5 in.
Cord Length
46 in.
27.75 in.
Flush Valve Size
3 in.
Gallons Per Flush
25.31 in.
20.44 in.
Length (Inside)
11.81 in.
Rough In
12 in.
2.125 in.
Water Area
10.75 x 7.5
17.125 in.
Width (Inside)
8.31 in.

Included Components

Bidet Seat Included
Seat Included

Characteristics and Features

Bowl Shape
One Piece
Control Type
Design Features
Glazed Trapway, Concealed Trapway, Soft Close, Chair Height, Low Profile
Flush Type
Gravity Flush
Installation Type
Floor Mounted
Vitreous China, Plastic, Stainless Steel
Seat Front
Tech Features
Heated Seat, Touchless Flush
Modern, Basic
Trip Lever Placement
Water Efficient

Manufacturer Technology

Flush Technology

Electrical and Operational Information

60 Hertz

Warranty and Product Information

Approved for Commercial Use
CA Drought Compliant
Comfort Height, Touchless Toilets
Country Of Origin
CSA Code
Manufacturer Warranty
1 Year Limited
WaterSense Certified
Product Videos
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How to remove and install a Toilet

How to remove and install a Toilet

If you have been considering replacing your toilet, yet are wondering how complicated of a job this is? Take a moment and we'll show you just how simple this job can actually be.

Kohler AquaPiston Technology

Kohler AquaPiston Technology

Kohler AquaPiston technology provides the industry's best flush.