Choosing between the TOTO WASHLET S5 and S2 is one of the most common decisions bidet buyers face in 2026.
Both seats are the direct successors to TOTO’s popular C5 and C200 models — and they bring serious upgrades to the table that you’ll want to know about before spending your money.
| Feature | TOTO WASHLET S5 | TOTO WASHLET S2 |
|---|---|---|
| Image |  |
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| Water Heating | Instantaneous (endless warm water) | Instantaneous (endless warm water) |
| Controls | Wireless remote (wall cradle) | Side arm control panel |
| User Presets | 4 user presets | 2 user presets |
| EWATER+ Wand Cleaning | Yes | Yes |
| PREMIST Bowl Spray | Yes | Yes |
| Seat Design | Seamless (no grooves) | Slim profile (19% slimmer than prior gen) |
| Dimensions (Elongated) | 21″L × 15.125″W × 5.5″H | Fits standard elongated (18.5″ bowl) |
| Buy Now |  |
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1. TOTO WASHLET S5 Electronic Bidet Toilet Seat
The TOTO WASHLET S5 is the direct replacement for the discontinued C5 and represents TOTO’s most refined mid-range bidet seat to date.
It brings a completely redesigned tankless profile that’s 19% slimmer than the outgoing model, along with a seamless seat design that eliminates every groove and seam — making it far easier to keep clean over years of daily use.
Features
- Instantaneous water heating for truly endless warm water — no tank means no cold surprises mid-spray
- EWATER+ wand cleaning system uses electrolyzed water to sanitize the nozzle inside and out before and after every use
- PREMIST technology mists the bowl before each flush, preventing waste from sticking and reducing cleaning effort
- Wireless remote with wall cradle for convenient hands-free access from anywhere on the toilet
- 4 user presets so every household member can save their exact preferences
- Seamless seat design with rounded corners eliminates hard-to-clean crevices
- Nightlight, heated seat with 5 temperature settings, warm air dryer, and built-in deodorizer all included
- Oscillating and pulsating spray modes; fits most standard elongated toilets
Pros
- Wireless remote is significantly more convenient and ergonomic than a side panel, especially in cramped bathrooms
- 4 user presets make it ideal for multi-person households where everyone has different preferences
- Seamless seat is notably easier to wipe clean than the ribbed designs found on older TOTO models
- Endless warm water means you never have to rush your wash — a real upgrade from the old tank-style C5
- Energy consumption reduced by up to 38% compared to previous-generation seats
Cons
- Costs more than the S2, so buyers on a tighter budget may find it harder to justify
- Wireless remote requires batteries; if you lose the remote, you lose access to several customization features
- Doesn’t include auto open/close lid — that feature is reserved for the higher-tier S7 and S550e models
The S5 is the seat to get if you want the full TOTO experience without stepping up to a luxury-class model. If you share your bathroom with two or more people, the 4-user preset system alone is worth the price difference over the S2. It’s also a great choice if you’re already familiar with heated bidet toilet seats and want to upgrade to something cleaner-looking and easier to maintain long-term.
Check its current price on Amazon
2. TOTO WASHLET S2 Electronic Bidet Toilet Seat
The TOTO WASHLET S2 is the updated successor to the beloved C200 and delivers every core TOTO feature you’d want at a more accessible price point.
Like the S5, it features instantaneous water heating, EWATER+ wand cleaning, PREMIST, and a heated seat — so you’re not giving up on hygiene or comfort by choosing it over the pricier model.
Features
- Instantaneous water heating for continuous warm water — a major upgrade over the old C200’s tank-style heater
- EWATER+ wand self-cleaning system sanitizes inside and outside the nozzle before and after every use
- PREMIST bowl spray activates automatically before each use to prevent waste buildup
- Side arm control panel with intuitive touchpad for easy in-seat adjustment
- 2 user presets for personalized cleansing settings
- Slim 19% slimmer profile than the previous generation C-series
- Nightlight, heated seat, warm air dryer, and deodorizer included
- Fits most standard elongated toilets; available in Cotton White and Sedona Beige
Pros
- More affordable than the S5 while still delivering TOTO’s signature cleansing quality
- Side arm panel is actually intuitive once you’re used to it and never needs batteries
- Endless warm water makes it a major step up from the C200 it replaces
- Slim new profile gives it a modern, low-key look that blends well in most bathrooms
- EWATER+ and PREMIST are included — the same core hygiene tech as the S5
Cons
- No wireless remote — the side panel requires you to reach to your side, which can feel awkward at first
- Only 2 user presets, so larger households may find the customization options a little limited
- Doesn’t have the seamless seat design of the S5 — more standard ribbed construction at the hinge area
The S2 makes a compelling case for anyone stepping up from a basic bidet or switching away from toilet paper for the first time. It’s also the smarter buy if you’re the only person using it day-to-day — you’ll love the warmth, the clean spray, and the EWATER+ wand hygiene without paying extra for features you don’t need. For more context on how electric bidet seats stack up overall, the bidet toilet seat comparison chart on this site is a great starting point.
Check its current price on Amazon
Head-to-Head: Water Heating
Both the S5 and S2 use TOTO’s instantaneous tankless heating system, which means you get endless warm water for as long as you need it.
This is a significant upgrade over the C5 and C200 — which this article originally covered — because the old models used tank or hybrid heating that would eventually run cold.
With either seat, you no longer need to worry about running out of warm water mid-wash.
The S5 and S2 are effectively tied here, which means water heating alone should not drive your decision.
Winner: Tie
Head-to-Head: Controls and Convenience
This is where the two seats diverge most noticeably.
The S5 comes with a sleek wireless remote that sits in a wall-mounted cradle — you can pick it up, hold it comfortably, and make adjustments without reaching awkwardly to your side.
The S2 uses a side arm control panel attached to the seat itself.
It works perfectly well and never needs batteries, but it does require a bit of muscle memory to use confidently, especially in the first few weeks.
For most users, the S5’s remote is a meaningful quality-of-life upgrade.
Winner: TOTO WASHLET S5
Head-to-Head: Nozzle Hygiene
Both seats use TOTO’s EWATER+ system, which generates electrolyzed water to sanitize the nozzle wand inside and out before and after every single use.
This is one of the reasons TOTO has such strong long-term reviews — the wand stays cleaner over months and years compared to seats that rely on simple rinse cycles.
Both also include PREMIST, which mists the toilet bowl before each use to prevent waste from sticking to the surface.
There is no practical hygiene difference between the two models on this front.
Winner: Tie
Head-to-Head: Multi-User Households
The S5 supports 4 user presets compared to the S2’s 2.
If you live alone or with one other person, 2 presets is more than enough.
But for families of three or four — where each person has different preferences for water temperature, spray pressure, and nozzle position — the S5’s extra preset slots are genuinely useful.
This is a real, practical difference, not just a spec sheet number.
Winner: TOTO WASHLET S5
Head-to-Head: Ease of Cleaning the Seat
The S5 features a seamless seat design with fully rounded corners and no visible grooves or seams at the hinge area.
This matters more than most buyers realize.
Bidet seats develop soap scum, moisture, and residue buildup over time — especially in the small crevices where the hinge meets the seat.
The S5’s seamless design eliminates those problem areas entirely, making routine cleaning quick and straightforward.
The S2 has a more conventional construction that, while still easy to clean by bidet standards, doesn’t have quite the same maintenance edge.
Winner: TOTO WASHLET S5
Verdict — Which One Should You Buy?
Buy the TOTO WASHLET S5 if… you share your bathroom with 3 or more people, you prefer the convenience of a wireless remote, or you want the easiest-to-clean seat design available in TOTO’s mid-range lineup. It’s also the right call if you’re someone who values long-term quality of life over upfront cost savings — the extra features are genuinely useful every day.
Buy the TOTO WASHLET S2 if… you’re buying for yourself or a two-person household, you don’t mind a side panel over a remote, or you want the same core TOTO hygiene technology at a lower price. It’s a fantastic value pick — especially for first-time bidet buyers coming from toilet paper or a basic bidet for an existing toilet. Both seats are serious quality upgrades for anyone exploring the world of bidet seats.
Frequently Asked Questions
Are the TOTO S5 and S2 replacements for the C5 and C200?
Yes. TOTO discontinued both the C5 (December 2025) and the C200 (discontinued earlier) and replaced them with the new S-series lineup. The S5 is the direct successor to the C5, and the S2 replaces the C200. Both new models add instantaneous water heating — a meaningful upgrade over the tank and hybrid systems on the older seats.
What is the biggest difference between the S5 and S2?
The two clearest differences are the control system and user presets. The S5 uses a wall-mounted wireless remote and supports 4 user presets. The S2 uses a side arm panel and offers 2 presets. Both deliver the same core cleaning performance with EWATER+ and PREMIST technology. If you’re also curious about how the older generation compared, see the TOTO C2 vs C5 breakdown.
Do both seats work on round toilets?
The elongated models covered in this article (SW3446#01 and SW3346#01) are designed for elongated toilets only. However, TOTO also makes round versions of both seats — the SW3445#01 (S5) and SW3345#01 (S2). If you’re unsure of your toilet shape, measure from the mounting holes to the front of the bowl: elongated measures around 18.5 inches.
Is a TOTO bidet seat hard to install?
Neither seat requires professional installation. Both come with all the hardware you need and can typically be installed in under an hour with basic tools. You do need an existing electrical outlet nearby — a GFCI 120V outlet is recommended. If there’s no outlet in your bathroom, you’ll need an electrician for that step only. Once you’re up and running, you’ll wonder how you lived without it — especially compared to the experience of simply relying on toilet paper alone.
Conclusion
Both the TOTO WASHLET S5 and S2 are outstanding bidet seats that genuinely improve your daily hygiene routine.
The S5 wins on convenience and long-term usability — the wireless remote, 4 user presets, and seamless seat design are real-world advantages you’ll appreciate every single day.
The S2 wins on value — it delivers TOTO’s core technology at a more accessible price, and for solo buyers or couples, it’s hard to argue with what you get.
Either way, you’re stepping into a significantly better bathroom experience than either the old C5 or C200 offered.
If you’re still weighing your options, browsing the full bidet toilet seat comparison chart can help you see how these models fit into the wider market. And if you’re curious about going further up the TOTO lineup, the highest-rated bidet toilet guide covers the premium tier in detail. For households with older users who need extra accessibility, the best bidets for seniors guide is also worth a read — both the S5 and S2 are excellent picks for that use case.
