Comparing the TOTO WASHLET S2 and KC2 puts you face-to-face with two of TOTO’s most popular entry-level bidet seats — and the differences matter more than you’d think.
Both seats earn high praise in the world of bidet toilet seats, but they’re built for different buyers, and picking the right one depends on what you actually value.
| Feature | TOTO WASHLET S2 | TOTO WASHLET KC2 |
|---|---|---|
| Image |  |
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| Model Number | SW3346 | SW3024 |
| Dimensions (L x W x H) | 21″ x 18″ x 6″ | 20.9″ x 14.8″ x 5.5″ |
| Water Heating | Instantaneous (unlimited) | Tank/Reservoir |
| PREMIST | ✅ Yes | ❌ No |
| EWATER+ | ✅ Yes | ✅ Yes |
| Night Light | ✅ Yes | ❌ No |
| Deodorizer | ✅ Yes | ❌ No |
| Controls | Side arm panel | Side arm panel |
| Warranty | 1 Year Limited | 1 Year Limited |
| Buy Now |  |
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1. TOTO WASHLET S2 (SW3346)
The TOTO WASHLET S2 is the newest entry-level seat in TOTO’s redesigned S-series lineup, and it arrives as a direct upgrade over the now-discontinued C2.
It brings instantaneous water heating, PREMIST, EWATER+, a built-in deodorizer, and a night light — making it one of the most feature-rich entry-level bidet seats TOTO has ever released at this price point.
Features
- Instantaneous tankless water heating for endless warm water — no running out mid-wash
- PREMIST® automatically wets the bowl before each use to prevent waste from sticking
- EWATER+® sanitizes the wand with electrolyzed water before and after every use
- CLEAN RESIN® coating on wand and seat surface resists bacteria and makes cleaning easier
- Front, rear, and soft rear spray with oscillating and pulsating stream options
- Built-in air deodorizer neutralizes odors automatically
- Night light illuminates the bowl — great for nighttime bathroom trips
- Warm air dryer with three temperature settings
- Heated SoftClose seat with adjustable temperature
- Side arm control panel with five pressure settings
- 19% slimmer profile than the C2 it replaces
- Available in Cotton White and Sedona Beige (elongated only)
Pros
- Unlimited warm water thanks to instantaneous heating — a major upgrade over tank-based seats
- PREMIST keeps the bowl cleaner between flushes, reducing maintenance
- Deodorizer and night light add real daily value that the KC2 lacks
- CLEAN RESIN coating makes the entire seat more hygienic and easier to wipe down
- Slimmer, more modern design looks great in contemporary bathrooms
Cons
- No wireless remote — side arm only (step up to the S5 if you want remote control)
- Requires a GFCI electrical outlet nearby
- Priced a step higher than the KC2
Check its current price on Amazon
2. TOTO WASHLET KC2 (SW3024)
The TOTO WASHLET KC2 is a dependable, straightforward entry into the TOTO WASHLET family that covers all the essentials without the premium extras.
It delivers a warm water wash, EWATER+ wand cleaning, a heated seat, and warm air drying — all through a familiar side arm control panel — at a lower price point than the S2.
Features
- EWATER+® self-cleaning wand that sanitizes before and after every use
- Warm water cleansing via a tank reservoir heating system
- Front and rear cleanse with oscillating and pulsating stream options
- Heated SoftClose seat with three temperature settings
- Warm air dryer with three temperature settings
- Adjustable water temperature (3 settings) and pressure (5 settings)
- Side arm control panel
- Compatible with most elongated toilets and TOTO WASHLET+ toilets
- Available in Cotton White only
Pros
- Lower entry price makes genuine TOTO hygiene technology more accessible
- EWATER+ wand cleaning is a real advantage over non-TOTO competitors at similar prices
- Tank heating delivers consistent warm water for most typical-length sessions
- Simple, intuitive side arm panel is easy for first-time bidet users
- Compact profile fits a wide range of toilet designs
Cons
- Tank heating means warm water can run out during very extended or back-to-back sessions
- No PREMIST — bowl cleaning requires more manual effort
- No built-in deodorizer or night light
- Only available in Cotton White — no color alternatives
- No CLEAN RESIN coating on the seat surface
Check its current price on Amazon
Water Heating: S2 Wins Clearly
This is the most important difference between these two seats — and it’s not close.
The TOTO WASHLET S2 uses an instantaneous tankless heater that delivers unlimited warm water from the very first second, no matter how long you use it.
The KC2 relies on a reservoir tank that pre-heats and stores a limited amount of warm water.
For most normal sessions, the KC2’s tank is perfectly adequate.
But if you take longer washes, share your bathroom with multiple people, or simply want the assurance that warm water will always be there, the S2’s instantaneous system is a meaningful real-world upgrade.
If you’re comparing this type of heating technology across multiple brands, our guide to the best self-cleaning bidets breaks down how water heating styles affect the full wash experience.
Winner: TOTO WASHLET S2
Hygiene Technology: S2 Has More Tools
Both seats share EWATER+® — TOTO’s proprietary system that uses electrolyzed water to automatically sanitize the wand inside and out before and after every use.
That alone puts both seats ahead of most competitors in the bidet seat comparison at similar price points.
But the S2 goes further.
PREMIST® automatically sprays the bowl with a fine mist of water before you sit down, making it much harder for waste to stick to the surface.
This is one of the most underrated features on any TOTO seat — it reduces how often you need to scrub the bowl and keeps everything cleaner between flushes.
The S2 also features CLEAN RESIN® on both the wand and seat surface, which actively resists bacterial buildup and makes the unit much easier to wipe clean day to day.
The KC2 doesn’t include PREMIST or CLEAN RESIN on the seat, making its hygiene package simpler overall.
If hygiene is your top priority when choosing a bidet, the S2 is clearly the stronger seat.
Winner: TOTO WASHLET S2
Comfort Features: S2 Adds the Details That Matter
Both seats deliver the comfort fundamentals: a heated SoftClose seat, warm water wash, and a warm air dryer.
But the S2 pulls ahead in two areas that affect your daily experience.
First, the built-in air deodorizer.
The S2 automatically neutralizes bathroom odors in real time — no sprays, no extra products needed.
The KC2 has no deodorizer at all.
Second, the night light.
The S2 illuminates the bowl with a soft glow, making late-night trips much easier without turning on overhead lights.
The KC2 has no night light.
Neither seat offers a wireless remote — both use a side arm panel only.
If a remote is important to you, you’d need to step up to the S5, which our TOTO S2 vs S5 comparison covers in full.
Winner: TOTO WASHLET S2
Design and Installation: Very Similar
Both seats carry TOTO’s clean, modern aesthetic with the signature SoftClose lid.
The S2 has a 19% slimmer profile than the older C-series design, giving it a more contemporary look that pairs well with modern bathrooms.
Installation is the same for both: mount the base plate, connect the T-valve to your water supply line, and plug into a nearby GFCI outlet.
No plumber required — most homeowners complete the install in under an hour.
Both are available in elongated and round configurations, and both are WASHLET+ compatible for seamless integration with TOTO WASHLET+ toilets.
If you’re weighing a WASHLET seat against a full integrated toilet, our guide to the highest-rated bidet toilets helps put that decision in context.
One small advantage: the S2 is available in Sedona Beige for elongated models, while the KC2 is Cotton White only.
For a deeper look at TOTO’s white finishes, our article on TOTO Cotton White vs Colonial White explains the difference clearly.
Winner: Tie
Verdict — Which One Should You Buy?
Both seats are well-built choices from one of the world’s most trusted bathroom brands.
But the right pick comes down to your priorities.
Buy the TOTO WASHLET S2 if…
You want the most complete entry-level TOTO experience available today.
If unlimited warm water, PREMIST bowl cleaning, a built-in deodorizer, a night light, and CLEAN RESIN hygiene all matter to you — the S2 delivers every one of them in a single package.
It’s the smarter long-term investment, especially in a shared bathroom with multiple daily users.
If you’re trying to decide where the S2 fits in TOTO’s full lineup, our TOTO A2 vs S2 comparison shows you exactly what separates the entry-level tiers.
Buy the TOTO WASHLET KC2 if…
Your budget is the primary constraint and you still want genuine TOTO hygiene technology — particularly EWATER+ wand cleaning — without paying for features you’re unlikely to use daily.
If you’re a solo user with shorter wash sessions and don’t need a deodorizer or night light, the KC2 gets you into the TOTO ecosystem at a lower cost.
For more context on how the KC2 compares to other entry options in the TOTO lineup, our TOTO C2 vs KC2 article is worth reading as background (note: the C2 has since been discontinued and replaced by the S2).
FAQ
Is the TOTO WASHLET C2 still available?
The TOTO WASHLET C2 has been discontinued and replaced by the TOTO WASHLET S2 (SW3346).
The S2 is a direct upgrade — it adds instantaneous water heating, PREMIST, a deodorizer, and a night light while keeping the same accessible side arm control format.
If you were searching for a C2, the S2 is the current model to buy.
Does the TOTO WASHLET KC2 have EWATER+?
Yes — the KC2 includes EWATER+® wand cleaning.
The wand is automatically sanitized with electrolyzed water before and after every use, which is a genuine hygiene advantage over standard auto-rinse systems on competing brands.
The S2 also has EWATER+, plus PREMIST and CLEAN RESIN, making its overall hygiene package more complete.
Can the S2 or KC2 fit my existing toilet?
Both seats are designed to fit most standard elongated North American toilets.
Your bowl should measure approximately 18.5 inches from the mounting holes to the front for elongated fit.
Both require a nearby GFCI electrical outlet — no hardwiring needed.
If your toilet has a French-curve bowl design, check compatibility before purchasing.
Our bidet seat comparison chart covers toilet compatibility in more detail.
Is the TOTO WASHLET S2 worth the extra cost over the KC2?
For most buyers, yes.
The S2 adds unlimited warm water, PREMIST bowl cleaning, a deodorizer, and a night light — all features that improve your daily experience in practical, noticeable ways.
If budget is the deciding factor and you’re a single user with shorter sessions, the KC2 is a capable seat.
But if you’re making a long-term bathroom upgrade and want the best hygiene and comfort at TOTO’s entry level, the S2 is the better investment.
Our TOTO S2 vs S5 article can help you decide if it’s worth stepping up even further in the lineup.
Conclusion
The TOTO WASHLET S2 and KC2 are both well-built, reliable bidet seats from the world’s most trusted name in this category.
The KC2 is a capable, budget-friendly entry point that still delivers EWATER+ wand hygiene in a clean, easy-to-use package.
But the S2 is the stronger seat by almost every meaningful measure — unlimited warm water, PREMIST, a deodorizer, a night light, and CLEAN RESIN combine to make it the smarter choice for anyone who wants the full TOTO entry-level experience.
If you’re serious about upgrading your bathroom hygiene and want a seat that covers all the bases without stepping all the way up to a premium model, the TOTO WASHLET S2 is the one to buy.
For a broader view of where these seats sit in the market, our guide to the best heated bidet toilet seats compares TOTO against the top alternatives from other brands — useful if you want to make sure you’re getting the best seat for your money before committing.
