Choosing between the TOTO Washlet S2, S5, and S7 is one of the most common decisions bidet buyers face — and getting it right could transform your bathroom for years to come.
This breakdown gives you a clear, honest look at all three models so you can stop second-guessing and pick the one that actually fits your bathroom, budget, and lifestyle.
| Feature | TOTO Washlet S2 | TOTO Washlet S5 | TOTO Washlet S7 |
|---|---|---|---|
| Image |  |
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| Dimensions (L x W x H) | 20-7/8″ x 18-5/8″ x 5-3/4″ | 20-7/8″ x 18-5/8″ x 5-1/4″ | 19″ x 18-9/16″ x 4-1/8″ |
| Water Heating | Instantaneous (unlimited) | Instantaneous (unlimited) | Instantaneous (unlimited) |
| Controls | Side-arm panel | Wireless remote (4 user presets) | Wireless remote (4 user presets) |
| EWATER+ Coverage | Wand only | Wand only | Wand + Bowl + Under-seat |
| PREMIST | ✔ | ✔ | ✔ |
| Dryer / Seat Temp Levels | 3 dryer / 3 seat | 5 dryer / 5 seat | 5 dryer / 5 seat |
| Warranty | 1 year | 1 year | 2 years |
| Buy Now |  |
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1. TOTO Washlet S2 (SW3346#01)
The S2 is TOTO’s entry point into the new S-series — and it punches well above what you’d expect from a budget bidet seat.
It replaces the discontinued C2 with a 19% slimmer profile, instantaneous warm water that never runs cold, a built-in nightlight, and PREMIST bowl misting, all in a cleaner-looking package that fits most standard elongated toilets.
If you’ve been browsing our bidet toilet seat comparison chart and want the most affordable way into genuine TOTO quality, this is exactly where to start.
Features
- Instantaneous tankless water heating for unlimited warm water
- PREMIST bowl misting before every use
- EWATER+ wand self-cleaning (before and after each use)
- CLEAN RESIN wand for bacterial resistance
- Side-arm control panel (no wireless remote)
- SoftClose heated seat with 3 temperature levels
- Warm air dryer with 3 temperature levels
- Built-in air deodorizer and nightlight
- WASHLET+ compatible for concealed cord installation
Pros
- Best-value entry into the S-series with all the core TOTO hygiene tech
- Instantaneous heating is a major upgrade over the old C2’s tank heater
- Slim profile fits virtually any standard elongated toilet
- Simple controls — ideal for first-time bidet users
Cons
- No wireless remote — controls are fixed to the side of the seat
- Only 3 dryer and seat temperature levels (vs. 5 on S5/S7)
- No user memory presets
- EWATER+ covers wand only, not the bowl
The S2 is the right call if you want trusted TOTO engineering, unlimited warm water, and solid everyday hygiene — without the complexity or premium cost of the higher models.
It’s also an excellent fit for a guest bathroom or a second toilet where simplicity is more important than personalization.
If you’re upgrading from an older tank-heater bidet — like the C2 — this is a meaningful leap forward, as covered in our detailed look at the TOTO C2 vs C5 generations.
Check its current price on Amazon
2. TOTO Washlet S5 (SW3446#01)
The S5 is the sweet spot of TOTO’s S-series — the model that Wirecutter named the best bidet seat of 2025, and the one most households will find delivers everything they need.
It takes the S2’s core platform and adds a wireless remote, four user presets, a seamless seat design that eliminates grime-catching gaps, and five levels of temperature and dryer control.
If you’re comparing this against other top-rated seats like the Brondell Swash 1400, our full Brondell Swash 1400 vs TOTO Washlet S5 breakdown gives you the complete picture.
Features
- Instantaneous tankless water heating — unlimited warm water
- Wireless remote (wall-mountable) with 4 user memory presets
- PREMIST bowl misting before every use
- EWATER+ wand self-cleaning (before and after each use)
- Seamless seat design (no gap for dirt or bacteria)
- SoftClose heated seat with 5 temperature levels
- Warm air dryer with 5 temperature levels
- Air deodorizer and nightlight
- WASHLET+ compatible
Pros
- Wireless remote is a major convenience upgrade over the S2’s side panel
- Four user presets — perfect for households with multiple users
- Five dryer and seat temperature levels offer more fine-tuned comfort
- Seamless seat design improves hygiene and looks far more polished
- Wirecutter’s top-rated bidet seat pick
Cons
- EWATER+ covers wand only — not the toilet bowl — unlike the S7
- No wide front cleansing mode (S7 has this for feminine hygiene)
- 1-year warranty (S7 comes with 2 years)
- No auto-flush compatibility
The S5 is the model most households should choose.
It gives you the full TOTO experience — endless warm water, smart wand hygiene, a wireless remote, and saved user settings — at a price point that’s hard to argue with.
If you’ve been comparing it against competitor seats in our best bidets for existing toilets guide, the S5 consistently lands at the top of that list for good reason.
Check its current price on Amazon
3. TOTO Washlet S7 (SW4726AT40#01)
The S7 is TOTO’s current flagship bidet seat — a premium model that replaces the discontinued S500e with a sleeker profile, full bowl EWATER+ cleaning, and a design that sits flush with the toilet for a near-integrated look.
At just 4.1 inches in rear height (versus the S5’s 5.25 inches), it’s one of the slimmest bidet seats on the market, and it’s the only model in this comparison that automatically cleans the bowl, wand, and under-seat area with electrolyzed water after every use.
If you’ve been evaluating it against the old C5 platform, our TOTO C5 vs S7 guide walks through exactly how the upgrade plays out.
Features
- Instantaneous tankless water heating — unlimited warm water
- Wireless illuminated remote with 4 user memory presets
- EWATER+ cleaning for wand, toilet bowl, AND under-seat area
- PREMIST bowl misting before every use
- 5 spray settings including wide front cleanse for feminine hygiene
- Ultra-slim 4.1″ rear height — sits flush with the toilet bowl
- Power deodorizer (stronger than standard models)
- SoftClose heated seat with 5 temperature levels
- Warm air dryer with 5 temperature levels
- Auto-flush compatible (kit sold separately, for TOTO T40 toilets)
- 2-year limited warranty
Pros
- Most thorough hygiene system — EWATER+ cleans bowl, wand, and under-seat automatically
- Ultra-slim profile gives the look of a built-in smart toilet
- Wide front cleanse mode is a meaningful upgrade for feminine wash
- Power deodorizer is noticeably stronger than on S2/S5
- 2-year warranty provides real-world peace of mind at this price point
- Auto-flush upgrade path — a feature the S5 completely lacks
Cons
- Significant price premium over the S5
- No auto open/close lid — that feature belongs exclusively to the S7A
- WASHLET+ installation requires a compatible T40 toilet for concealed cords
- Lid style choice (Contemporary vs Classic) adds a decision point
The S7 is the right choice for buyers who want the most automated bathroom hygiene available without replacing their entire toilet.
If you’re designing a bathroom remodel or pairing with a TOTO WASHLET+ toilet like those reviewed in our TOTO AP vs EP guide, the S7 is the seat that creates that truly integrated look and feel.
Check its current price on Amazon
Head-to-Head: S2 vs S5 vs S7
Controls and Ease of Use
This is the most practical difference you’ll feel every single day.
The S2 uses a side-arm control panel attached directly to the seat — intuitive for solo users, but awkward for anyone with limited mobility or anyone who doesn’t want to reach sideways.
Both the S5 and S7 use a wall-mountable wireless remote with four user memory presets.
For families or couples, that memory function is genuinely transformative — each person walks in, taps their preset, and gets their personalized wash without adjusting a thing.
For a breakdown of how accessible bidet controls matter for different users, our best bidets for seniors guide covers this in depth.
Winner: S5 and S7 (tied) — the wireless remote and user presets are a daily quality-of-life upgrade.
Hygiene Technology
All three seats share TOTO’s signature hygiene duo: PREMIST (bowl misting before you sit) and EWATER+ (wand self-cleaning before and after each use).
But the S7 goes significantly further.
While the S2 and S5 apply EWATER+ to the wand only, the S7 extends it to the entire toilet bowl and the under-seat area — automatically, after every use.
This means your toilet stays visibly cleaner between scrubs, and you’ll spend less time with a cleaning brush.
For anyone who’s curious about how that level of passive hygiene actually feels in practice, our guide to how it feels to use a bidet puts the whole experience in context.
Winner: S7 — full bowl EWATER+ cleaning is the most meaningful hygiene upgrade in this comparison.
Comfort Features
On seat warmth and drying, the S5 and S7 are equal — both offer five adjustable temperature levels for the heated seat and warm air dryer, which gives you noticeably more fine-grained control than the S2’s three levels on each.
The S7 adds a wide front cleansing mode (for enhanced feminine hygiene) and a power deodorizer that runs more intensively than the standard deodorizer shared by the S2 and S5.
If heated seat performance is a top priority, our best heated bidet toilet seats guide compares seat warmth performance across the top models currently available.
Winner: S7 (narrow edge) — wide front cleanse and power deodorizer tip the balance at the premium end.
Design and Profile
All three seats carry TOTO’s new slim S-series aesthetic — 19% slimmer than the older C-series models they replaced.
But the S7 takes this further.
At 4.1 inches in rear height versus the S5’s 5.25 inches, the S7 sits noticeably lower and closer to the bowl, creating an appearance that closely mimics an integrated bidet toilet.
The S7’s lid is also designed to sit flush with the bowl edge — a visual detail that makes a real difference if bathroom aesthetics matter to you.
For context on how TOTO’s color options interact with these design differences, our TOTO Colonial White vs Cotton White guide is worth a quick read.
Winner: S7 — the ultra-slim 4.1″ profile and flush-mounted lid are genuinely premium design choices.
Verdict — Which One Should You Buy?
Buy the TOTO Washlet S2 if… you want the cleanest possible introduction to TOTO quality at the lowest entry cost.
You’re fine with a side-panel control, you only need one user setting, and you’re not sharing the seat with multiple family members who each have different preferences.
It’s also the smart pick for a secondary bathroom or rental property where you want reliable TOTO hygiene without overspending.
Buy the TOTO Washlet S5 if… you want the best all-around bidet seat for everyday household use — which, for most people, is exactly what this is.
The wireless remote, four user presets, seamless seat, and five-level dryer and heat controls cover every realistic daily-use need.
It’s the model Wirecutter recommends, and it’s hard to argue with that assessment when you consider the balance of features versus price.
Buy the TOTO Washlet S7 if… you want full bowl-level hygiene automation, the slimmest possible profile, a wide front cleanse mode, and the ability to add auto-flush down the road.
It’s built for buyers who don’t want to compromise on any dimension of bathroom hygiene and are designing their bathroom — not just buying a seat.
If you’re also weighing a full smart toilet upgrade, check out our guide to the highest-rated bidet toilets to see where integrated units fit into the picture.
FAQ
What is the main difference between the TOTO S2 and S5?
The core cleaning technology is identical — both use instantaneous heating, PREMIST, and EWATER+ wand cleaning.
The S5 adds a wireless remote with four user memory presets, a seamless seat design, and five levels (rather than three) for dryer and seat temperature control.
If you share your bathroom, the S5’s presets alone make it worth the upgrade.
Does the TOTO Washlet S7 have auto open/close?
No — the current S7 does not have automatic lid opening and closing.
That feature belongs exclusively to the S7A (SW4736AT40#01), which is otherwise identical to the S7 but adds the hands-free auto open/close lid and seat.
If that’s a priority for you — especially for accessibility reasons — our guide to the best bidets for elderly users covers the S7A and other hands-free options.
Are the S2, S5, and S7 all compatible with my existing toilet?
All three are designed for standard elongated toilet bowls.
Each requires at least 2 inches of clearance between the tank face and the center of the mounting holes, and a nearby GFCI electrical outlet.
Toilets with a “French curve” where the tank meets the bowl at an angle may not be compatible — always check before ordering.
All three are also WASHLET+ compatible, meaning you can pair them with TOTO T40-ready toilets to conceal the power cord and water line for a seamless install.
Is the TOTO S7 worth the price over the S5?
For most households, the S5 is the smarter value.
The S7 earns its premium if you want full bowl EWATER+ cleaning (which visibly reduces how often you need to scrub), the ultra-slim 4.1″ profile, the wide front cleanse mode, or the auto-flush upgrade path.
For a direct comparison of how the C5-era seats compared before TOTO’s redesign, our TOTO C5 vs S7 guide provides useful context on how much has changed across generations.
Conclusion
All three of TOTO’s S-series seats — the S2, S5, and S7 — share the same DNA: instantaneous warm water, PREMIST bowl misting, and EWATER+ wand cleaning.
What separates them is how much control, convenience, and hygiene automation you want layered on top of that foundation.
The S2 delivers genuine TOTO quality in the simplest, most affordable form.
The S5 is the pick for most households — a wireless remote, four user presets, and a seamless seat make it the smart everyday choice, and there’s a reason it sits at the top of nearly every best-of list right now.
The S7 is for buyers who want total bathroom hygiene automation and a design that rivals a built-in smart toilet — at a price that’s still far less than replacing your entire fixture.
Whichever model you choose, you’re getting one of the most well-engineered bidet seats on the market — and once you’ve lived with it, you’ll understand why over 60 million people worldwide use a TOTO WASHLET every day.
Still comparing options across the full market? Our bidet toilet seat comparison chart and best bidets for existing toilets guide are the best next reads.
