The TOTO Washlet S2 (SW3346) is the brand’s newest entry-level S-Series bidet seat — the direct upgrade to the discontinued C2, now with instantaneous warm water and a slimmer 19% tankless profile.
I’ve been using this seat daily and putting it through its paces, so here’s everything you need to know before you decide.
TOTO Washlet S2 Specs at a Glance
| Specification | Detail |
|---|---|
| Image |  |
| Model Number | SW3346#01 (Elongated, Cotton White) / SW3345#01 (Round, Cotton White) / SW3346#12 (Elongated, Sedona Beige) |
| Dimensions (L x W x H) | 24-3/8″ x 21″ x 7-7/16″ |
| Water Heating | Instantaneous tankless heater — unlimited warm water |
| Wash Modes | Rear Cleansing, Rear Soft Cleansing, Front Cleansing; oscillating stream option |
| Hygiene Tech | EWATER+® wand auto-cleaning, PREMIST® bowl misting, CLEAN RESIN® wand coating |
| Controls | Side-mounted arm control panel (no wireless remote) |
| Heated Seat | Yes — adjustable temperature (82–97°F / 28–36°C) |
| Warm Air Dryer | Yes — 3 temperature settings (95–140°F / 35–60°C) |
| Night Light | Yes — illuminates the inside of the bowl |
| User Presets | None |
| Colors Available | Cotton White, Sedona Beige |
| Toilet Compatibility | Most standard elongated and round toilets; WASHLET+ compatible; French curve toilets may not fit |
| Warranty | One-year limited warranty |
| Check Price |  |
Pros & Cons of TOTO Washlet S2
| ✅ Pros | ❌ Cons |
|---|---|
| Instantaneous tankless water heater — unlimited warm water from the first second | No wireless remote — side arm panel only |
| EWATER+® wand auto-cleaning before and after every single use | No user presets — settings don’t save per person |
| PREMIST® bowl misting keeps the toilet cleaner between scrubs | Short 3.93 ft power cord — requires an outlet very close to the toilet |
| CLEAN RESIN® wand coating resists bacteria and buildup passively | Warm air dryer has only 3 settings vs 5 on the S5 |
| 19% slimmer silhouette than previous tank-style seats | No oscillating/pulsating dryer — wash only |
| Heated SoftClose® seat with auto energy-saver mode | Warranty is only one year — shorter than Brondell’s 3-year coverage |
| WASHLET+ compatible for concealed cord/hose on select TOTO toilets | No auto open/close lid at this price point |
Check its current price on Amazon
Is the TOTO Washlet S2 Worth It?
Yes — without much hesitation, especially if you’re upgrading from a basic toilet seat or an older tank-heater bidet.
The S2 brings three of TOTO’s most important proprietary hygiene technologies — EWATER+, PREMIST, and CLEAN RESIN — to a price point that used to require stepping up to the C5 or higher.
What you’re getting is genuinely unlimited warm water from the moment you press the button, automatic wand sanitization using electrolyzed water, and passive bowl protection that keeps your toilet cleaner between sessions without any extra effort.
The main trade-offs are the side-arm control panel instead of a wireless remote, the lack of user memory presets, and a one-year warranty that’s shorter than some competitors.
If those are deal-breakers for you, stepping up to the TOTO S5 or S7 makes sense — but for the majority of single-user or budget-conscious households, the S2 punches well above its price class.
Design and Build Quality
The S2 is noticeably sleeker than older TOTO models — that 19% slimmer tankless silhouette makes a real visual difference when you see it on your toilet.
The seamless seat design eliminates the classic gap where dirt and bacteria typically collect, which is a thoughtful detail you won’t find on every bidet at this price.
Build quality feels solid and premium — the plastics don’t creak, the SoftClose® lid lowers quietly every time, and the docking station makes removing the seat for deep cleaning effortless.
It’s WASHLET+ compatible, meaning if you pair it with a compatible TOTO toilet, the power cord and water hose route through the toilet itself — completely hidden, no dangling cables.
If a completely cable-free aesthetic matters to you, check out our guide to the TOTO AP vs EP wall-hung toilets, which are specifically designed for that kind of seamless WASHLET+ integration.
Available in Cotton White and Sedona Beige, it fits most standard elongated and round toilets — though French curve bowls may not be compatible, so measure your bowl before ordering.
Cleaning Performance
This is where the S2 genuinely earns its reputation.
The instantaneous water heater delivers warm water from the very first second — there’s no awkward cold burst while a tank heats up, which was the main frustration with older models like the C2.
You get three wash modes: rear cleansing, rear soft cleansing, and front cleansing — all with adjustable water temperature and pressure.
The oscillating stream option cycles the nozzle back and forth across a broader area, which delivers a more thorough clean than a fixed-position spray.
The EWATER+® system automatically sanitizes the wand using electrolyzed water before and after every single use — no chemicals, no user input required.
Add in PREMIST®, which pre-mists the inside of the bowl before you sit down, and you end up with a toilet that genuinely stays cleaner between scrubs.
If you want to understand how this hygiene stack compares across TOTO’s full lineup, our bidet toilet seat comparison chart has a side-by-side breakdown worth reviewing.
Comfort Features
The heated seat is adjustable across a 28–36°C (82–97°F) range with an auto energy-saver mode that reduces power consumption when the seat detects infrequent use — a genuinely smart feature.
The warm air dryer offers three temperature settings and handles the job well for most users, though if you want the extra dryer customization of five settings, that’s available on the S5.
The built-in air deodorizer activates automatically and neutralizes odors in real time rather than just masking them.
The night light illuminates the bowl — practical for late-night trips and a subtle feature that most users quickly take for granted in the best possible way.
If heated seat performance across the premium tier is your primary concern, our guide to the best heated bidet toilet seats is a useful companion read before you decide.
Controls and Installation
The S2 uses a side-mounted arm control panel rather than a wireless remote — and this is the most important buying decision point at this price level.
The side panel is clean, intuitive, and easy to reach once you’re seated, but if you strongly prefer a handheld remote — especially in a multi-user household or for users with limited mobility — the S5 is the next step up.
Installation is a genuine DIY project for most people.
You remove your existing seat, attach the docking plate to the bowl, slide the S2 on, connect the T-connector to your toilet’s water supply line, and plug the unit into a nearby GFCI outlet.
The power cord is 3.93 ft (about 1.2 m) — make sure your outlet is close to the toilet before ordering, as this is a common oversight that causes problems after delivery.
If you want to understand the full range of installation types — from basic attachments to full integrated toilets — our guide to the best bidets for existing toilets walks through compatibility clearly.
Who Should Buy the TOTO Washlet S2?
The S2 is the ideal seat for someone upgrading from a standard toilet seat or an older tank-heater bidet who wants TOTO’s full hygiene technology stack without paying for a wireless remote or user presets.
It’s an excellent choice for single-user bathrooms or couples who don’t mind adjusting settings manually.
If you’re curious about what the full bidet experience actually feels like before committing, our piece on how it feels to use a bidet answers the most common first-timer questions honestly.
For buyers who want a wireless remote, four user memory presets, and five dryer settings, the TOTO S5 is the natural upgrade — we break that down in our Brondell vs TOTO Washlet S5 comparison and the TOTO C5 vs S7 head-to-head.
If you’re weighing the S2 against the brand’s previous A-series entry point, our TOTO A2 vs S2 comparison is worth a read before you decide.
FAQ
Does the TOTO Washlet S2 replace the C2?
Yes — the S2 (SW3346) is TOTO’s direct replacement for the now-discontinued C2 (SW3074), launched in 2025 as part of the redesigned S-series lineup.
The key upgrade is the switch from a tank heater to an instantaneous water heater, which means you get unlimited warm water from the first second rather than running cold after 30–60 seconds the way older tank-heater models did.
The S2 also adds CLEAN RESIN® wand coating and a slimmer 19% reduced profile compared to the C2.
Does the TOTO Washlet S2 fit round toilets?
Yes — the S2 is available in both elongated (SW3346) and round (SW3345) versions.
Always confirm your bowl shape before ordering — an elongated bowl is roughly 18.5 inches from the mounting holes to the front of the bowl, while round bowls are closer to 16.5 inches.
French curve toilet designs may inhibit proper installation regardless of bowl shape, so check your toilet profile if you have a non-standard bowl.
What is EWATER+ and why does it matter?
EWATER+® is TOTO’s proprietary electrolyzed water technology — it transforms ordinary tap water into a mildly acidic solution that acts as a natural sanitizing agent.
The S2 uses it to automatically clean the inside and outside of the wand before and after every single use, with no chemicals or user input required.
This is one of the reasons TOTO seats consistently score higher on hygiene than similarly priced competitors — the wand self-sanitizes passively every time you use it.
How does the S2 compare to the S5?
The S5 (SW3446) is TOTO’s next step up in the S-series and adds several meaningful upgrades: a wireless remote instead of a side arm panel, four user memory presets, five dryer temperature settings instead of three, and a slightly slimmer physical profile.
Both seats use instantaneous water heating and the full EWATER+ / PREMIST hygiene stack, so the core cleaning experience is very similar.
The S2 makes the most sense for budget-conscious buyers or single-user bathrooms where individual preset storage isn’t needed — if you want the remote and presets, the S5 is worth the step up.
Conclusion
The TOTO Washlet S2 is one of the most compelling entry-level bidet seats on the market right now.
It brings TOTO’s full hygiene technology — EWATER+, PREMIST, CLEAN RESIN, and instantaneous warm water — to a price point that undercuts what these features used to cost.
The trade-offs are real: no wireless remote, no user presets, and a shorter warranty than some rivals.
But for the vast majority of buyers who want a reliable, genuinely hygienic TOTO seat without overpaying for features they won’t use daily, the S2 is a very easy recommendation.
If you want to see how it stacks up across the full bidet market, our bidet toilet seat comparison chart is the best next stop — and if you’re ready to explore higher up the TOTO lineup, our TOTO C5 vs S7 breakdown shows exactly where the premium investment pays off.
