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Toto KS5 vs S5

The TOTO KS5 and S5 are very similar bidet seats that offer the same core features like tankless warm water, EWATER+ cleaning, and personalized settings. The main difference comes down to design and positioning, with the KS5 being a newer, more refined version while the S5 remains a proven and widely popular model.

Both models deliver excellent comfort and hygiene, but the S5 often stands out as the better value, while the KS5 offers a slightly more updated look. Check out our Toto Washlet Comparison Chart to compare all Toto Washlets.

Comparison between Toto Washlet K55 with traditional curved lid and Toto Washlet S5 with modern telescoping lid on a blue background.


Quick Verdict

Not sure where to start? Here’s the short version. Both bidets provide the same elite cleaning experience, but they differ in visual style and sizing compatibility.

Toto KS5

An online-exclusive powerhouse that delivers TOTO's flagship tankless technology.

Choose this if you want…

  • The absolute best value for a tankless, instant-heat TOTO
  • A traditional curved lid that looks like a standard toilet seat
  • The same elite features (4-User Memory, EWATER+) as showroom models
$465.30
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Toto S5

A designer-tier bidet seat featuring a sleek, flat lid that covers the seat entirely for a modern, seamless silhouette.

Choose this if you want…

  • A seamless, "hidden" look with a telescoping lid design
  • Compatibility for a Round toilet or a Sedona Beige color match
  • The most refined aesthetic for a contemporary master bathroom
$682.00
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Toto KS5 vs S5 Comparison Chart

The table below summarizes the key specs and features of the TOTO KS5 and TOTO S5 Washlets. Use this as a quick reference before diving into the detailed breakdown below.
Toto KS5 vs S5 Comparison Chart
Feature Toto KS5 Toto S5
Water Heating Instant / Tankless Instant / Tankless
Lid Design Traditional Curved Slim Telescoping
Seat Shapes Elongated Only Elongated & Round
Colors Cotton White White & Sedona Beige
User Memory 4 Profiles 4 Profiles
EWATER+ (Wand) Yes Yes
Night Light Auto-Sensing Auto-Sensing
Profile Height ~5.5 inches ~5.5 inches

Toto KS5 vs S5 Washlets: Detailed Review

1
TOTO WASHLET KS5 Elongated Bidet Seat - White electronic toilet seat with control panel on a white background

TOTO WASHLET KS5 Elongated Bidet Seat

TOTO

Pros
  • Best-in-Class Value
  • Continuous Warm Water
  • Ultra-Slim Build
  • Includes PREMIST
  • Reliable Hardware
Cons
  • Lid is manual
  • Minimal Customization
$465.30
View Product
2
TOTO WASHLET S5 Bidet Round Seat - main image of bidet seat on a white background

TOTO WASHLET S5 Bidet Seat

TOTO

Pros
  • Warm water wash
  • Heated seat & warm air dryer
  • Self-cleaning nozzle
  • Deodorizer
  • Adjustable spray & pressure
Cons
  • Higher price than basic seats
  • Needs power outlet
  • No advanced smart app control (remote only)
$682.00
View Product

TOTO KS5 vs S5: What Makes These Models Special?

Aesthetic vs. Utility

The choice between the KS5 and S5 is essentially a design preference. The S5 features a Telescoping Lid, which hangs over the edge of the seat, creating a single, uniform look when closed. The KS5 uses a Standard Curved Lid that sits on top of the seat.

Both seats utilize the same "Slim Series" chassis, making them approximately 19% thinner than older bidet models.

TOTO WASHLET S5 Bidet Seat - side view of round bidet seat on a white background

Advanced Technology Features

Both models include TOTO’s premium wireless remote, which allows 4 unique users to save their preferred water temperature, pressure, and wand position.

They also both feature PREMIST (spraying the bowl so waste doesn't stick) and EWATER+ (sanitizing the wand with electrolyzed water after every use).

TOTO WASHLET S5 heated seat

Choose TOTO KS5 If You:

  • Prefer a traditional look - You want flagship performance but like the familiar appearance of a standard curved lid.
  • Find it through your favorite retailer - You are shopping through a specific online partner or preferred vendor where this model is featured.
  • Want an identical alternative to the S5 - You want the exact same internal tech (tankless heat, 4-user memory) in a different external shell.

Choose TOTO S5 If You:

  • Need a Round seat or Sedona Beige color - You aren't limited to elongated white toilets and need more versatile sizing or color options.
  • Want the most widely available model - You prefer the "standard" showroom model that is supported by every major TOTO distributor.
  • Value a designer aesthetic - You want the modern, seamless look of a telescoping lid that completely hides the seat.
  • Want the best overall value - You want the peace of mind of TOTO's most popular flagship seat.

Frequently Asked Questions

  • The internal tech is identical. The S5 has a modern telescoping lid and more color/size options, while the KS5 has a traditional lid and is an online-exclusive for elongated white toilets.

  • Yes. Both are tankless and heat water on-demand.

  • Yes, both the KS5 and S5 feature memory profiles for up to 4 users.

  • Yes, the S5 is available in both Elongated and Round versions.

  • It is a design on the S5 where the lid overlaps the seat when closed, hiding the seat entirely for a cleaner look.

  • On these models, EWATER+ is used specifically to sanitize the spray wand, not the bowl.

  • Yes, both feature an auto-sensing LED nightlight.

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