The TOTO Washlet S7 is the brand’s current flagship bidet seat — a slim, fully automated upgrade that fits onto your existing toilet and replaces the well-loved S500e with meaningful improvements across design, hygiene, and usability.
In this review, you’ll get a complete breakdown of every feature, real-world performance, and a straight answer on whether it’s the right seat for you.
Specs: TOTO Washlet S7 at a Glance
| Specification | Detail |
|---|---|
| Image |  |
| Model Number | SW4726AT40#01 (Contemporary Lid, Elongated) |
| Dimensions (L x W x H) | 20-1/2″ x 15-3/4″ x 4.1″ (rear height) |
| Water Heating | Instantaneous tankless — unlimited warm water |
| Wash Modes | Rear Cleanse, Soft Rear, Front Cleanse, Wide Front, Oscillating, Pulsating |
| Hygiene Tech | EWATER+® (wand & bowl), PREMIST®, CLEAN RESIN® |
| Controls | Illuminated wireless remote, wall-mountable, 4-user memory presets |
| Heated Seat | Yes — 82°F–97°F, 5 levels, SoftClose®, seamless design |
| Warm Air Dryer | Yes — 95°F–140°F, 5 levels |
| Night Light | Yes — illuminates the side and inside of the bowl |
| User Presets | 4 personalized memory settings |
| Auto Flush | Compatible with optional auto flush kit (TOTO T40 WASHLET+ toilets only) |
| Colors Available | Cotton White, Sedona Beige |
| Toilet Compatibility | Elongated toilets — WASHLET+ and standard (most manufacturers) |
| Power | 120V GFCI outlet, 1290W, 3.9 ft cord |
| Warranty | 2-Year Limited (Residential) |
| Check Price |  |
Pros & Cons of TOTO Washlet S7
| ✅ Pros | ❌ Cons |
|---|---|
| EWATER+® cleans both the wand AND the bowl — a meaningful upgrade over the S5 | No auto open/close lid — that’s only on the S7A, which costs more |
| Instantaneous tankless heating — warm water the moment you start, lasts as long as you need | Spray pressure is effective but not the strongest on the market |
| Seamless seat design eliminates the gap where dirt and bacteria collect | Auto flush requires a separately sold kit and a compatible TOTO T40 toilet |
| 4-user memory presets — ideal for couples and families sharing one bathroom | Elongated only — no round version available for this model number |
| Illuminated remote with wall-mount dock — easy to find and use in the dark | Premium price puts it at the top of the bidet seat budget range |
| Power deodorizer boost and manual EWATER+® mist button — new S7-exclusive controls | Night light reported as slightly too bright and cool-toned by some users |
| WASHLET+ compatible — conceals cord and hose when paired with a TOTO T20/T40 toilet | Changing advanced settings via remote takes some reading of the manual |
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Is the TOTO Washlet S7 Worth It?
Yes — for most buyers who want a true flagship bidet seat without replacing their entire toilet, the Washlet S7 is the right answer.
It is the sweet spot in TOTO’s current lineup: more capable than the S5 in nearly every area that matters day-to-day, and substantially less expensive than the S7A while missing only the auto open/close lid. If you do not need the lid to open automatically as you approach, you get virtually the same toilet experience for considerably less money.
Users consistently rate it among the best bidet seats they have owned, and its position on the bidet toilet seat comparison chart reflects that — it competes at the top of the electric seat category in both features and build quality.
Design & Build Quality
The Washlet S7 represents a significant visual step forward from the S500e it replaced. At just 4.1 inches in rear height, it is one of the slimmest bidet seats available — and TOTO’s engineers went further by making the seat itself completely seamless.
That seamless seat is a bigger deal than it sounds. On older bidet seats, the small gap between the seat and its mounting created a crevice where bacteria and grime would collect and was genuinely difficult to clean. The S7 eliminates that gap entirely, giving you a surface that wipes clean in seconds. The lid is SoftClose® — no slamming — and sits flush with the toilet bowl for what TOTO describes as an “integrated” look, even on non-TOTO toilets.
The S7 comes in two lid style options — Contemporary (rounded, modern) and Classic (beveled edge, more traditional) — so you can match it to the aesthetic of your toilet bowl. It is available in Cotton White and Sedona Beige. Build quality is exactly what you expect from a flagship TOTO seat: solid, well-fitted, and engineered to last well beyond the 2-year residential warranty. If design matters to you and you want to see how it compares to other top seats, our guide to heated bidet toilet seats has a thorough side-by-side breakdown.
The WASHLET+ compatibility is worth flagging for buyers with a TOTO T20 or T40 WASHLET+ ready toilet: you can route the power cord and water supply hose internally through the toilet, eliminating all visible cables for a truly seamless installation. This is one of the most requested features among buyers upgrading their entire bathroom setup, and it is one of the reasons the S7 shows up so frequently in best toilet with bidet roundups even though it is technically a seat, not an integrated unit.
Cleaning Performance
This is where the S7 most meaningfully separates itself from the S5, and the difference is real.
The S5 uses EWATER+® only on the wand — the electrolyzed water sterilizes the nozzle before and after every use, which is excellent. The S7 goes a step further: EWATER+® now also mists the toilet bowl itself after every use, creating ongoing automated bowl sanitation that reduces the amount of manual scrubbing your toilet needs between cleanings. If you have ever noticed that homes with TOTO WASHLET seats tend to have noticeably cleaner-looking bowls, this is why.
PREMIST® coats the inner surface of the bowl with water before you sit down, activating the CLEAN RESIN® and ceramic surface to prevent waste from adhering. The combination of PREMIST® + EWATER+® bowl misting + CLEAN RESIN® wand coating is a three-layer hygiene system that no other brand in this price range currently matches. It is the same layered approach found in the self-cleaning bidets for existing toilets that consistently top expert recommendation lists.
New on the S7 is a manual EWATER+® mist button on the back of the remote — you can trigger a bowl mist on demand any time you want, which is a small but genuinely useful addition. There is also a Power Deodorizer mode that kicks the deodorizer fan into high gear for especially challenging sessions. Both features are exclusive to the S7 series and absent on the S5.
Comfort Features
The Washlet S7 delivers the full comfort package you expect at this price point — and does it without compromise.
Instantaneous tankless heating means warm water from the first second of every wash, lasting as long as you need it. There is no tank to run out of, and no lukewarm water in the middle of a cleanse — a problem that plagued older TOTO C-series tank-heater seats and one of the most cited reasons users upgrade. The AIR-IN WONDER WAVE spray technology infuses air into each water droplet, creating a gentler, more effective clean that covers more surface area without needing higher pressure. If you have been comparing this seat to options like the Brondell Swash CL1700, note that the S7’s spray is intentionally aerated and comfortable rather than high-pressure — a deliberate design choice, not a limitation.
Five spray modes cover every use case: Rear Cleanse, Soft Rear, Front Cleanse, Wide Front, and Oscillating/Pulsating options within each. Water temperature is adjustable from 86°F to 104°F across five levels. The warm air dryer reaches up to 140°F across five settings — effective enough to eliminate the need for toilet paper on most washes. For anyone who has been wondering about the difference between these seat types and a full integrated unit, our best bidets for home use guide walks through the full spectrum.
The heated seat ranges from 82°F to 97°F and covers the full seat surface through the seamless design. Four user memory presets make the S7 practical for households with multiple people — each person saves their water temperature, pressure, seat temperature, nozzle position, and dryer preference into their own preset, then recalls it with one button on the illuminated remote. For senior users or anyone with mobility challenges, the one-touch preset combined with the wide front wash makes the S7 one of the most accessible bidet seats available. Our guide to bidets for seniors covers exactly this kind of use case.
Controls & Installation
The S7 is operated by a slim, wall-mountable wireless remote with an illuminated touchpad — an upgrade over the side-arm panel found on the entry-level S2 and a step up from the non-illuminated remote on the older S500e. The backlit buttons make nighttime use genuinely easy, though several users note that navigating deeper settings still benefits from keeping the manual handy the first few times.
Installation is straightforward DIY territory for most bathrooms. The seat ships with all mounting hardware, a tee connector, and the remote. You slide the seat onto the base plate, connect the water supply via the tee connector at the fill valve, and plug into a standard 120V GFCI outlet within 3.9 feet of the toilet. WASHLET+ installation requires a compatible TOTO T20/T40 toilet but is equally approachable for a confident DIYer. French-curve toilets and some fully skirted bowls may limit water connection access — always check clearance under the tank before purchasing. The S7 fits elongated toilets only; if you have a round bowl, you will need to look at the comparison chart for round-compatible options.
Auto flush is supported but requires the separately sold TOTO THU857 kit and a compatible TOTO T40 WASHLET+ ready toilet. If auto flush is a priority and you are starting from scratch with a new toilet, our TOTO AP vs EP wall-hung toilet guide covers excellent options that pair cleanly with the S7 series.
Who Is the TOTO Washlet S7 Best For?
The S7 is the right seat for you if you want TOTO’s best bidet seat technology without paying the S7A premium for an auto-open lid you may not actually need.
It is ideal for couples and families — four user presets means no one is ever resetting someone else’s settings. It suits buyers who want bowl-level EWATER+® hygiene (not just wand cleaning) and are comfortable with the illuminated remote handling all controls. It pairs beautifully with any TOTO WASHLET+ ready toilet for a fully concealed, cable-free installation.
If you are upgrading from an older S-series or C-series seat and want to see exactly what changed, our TOTO C5 vs S7 comparison has a full breakdown of every upgrade across generations.
FAQ
What is the difference between the TOTO Washlet S7 and S7A?
The only difference is the auto open/close lid. The S7A lid opens automatically as you approach the toilet and closes after you flush — hands-free from start to finish. The S7 requires you to lift and lower the lid manually, or use the remote. Every other feature — EWATER+® bowl cleaning, PREMIST®, instantaneous heating, spray modes, 4-user presets, illuminated remote, WASHLET+ compatibility — is identical between the two models. If hands-free lid operation is not a priority for you, the S7 delivers the same core experience at a lower price.
Does the TOTO Washlet S7 fit round toilets?
No. The SW4726AT40#01 is an elongated seat only. If you have a round toilet bowl, you will need a different model — TOTO does offer round versions within the S7 family (SW4725#01 and SW4735#01 for the S7A), but those are separate SKUs. Always measure your bowl before purchasing: elongated bowls typically measure around 18.5 inches from bolt holes to front rim, while round bowls measure around 16.5 inches. Our bidet seat comparison chart flags toilet shape compatibility for every model listed.
How does the S7’s EWATER+® differ from the S5?
On the S5, EWATER+® cleans only the wand — sterilizing the nozzle inside and out before and after every use. On the S7, EWATER+® also mists the toilet bowl itself after each use, creating ongoing bowl sanitation on top of wand hygiene. The S7 additionally adds a manual EWATER+® mist button on the remote so you can trigger a bowl mist on demand any time. This makes the S7’s hygiene system meaningfully more comprehensive than the S5’s — not just a marketing refresh. If you are deciding between the two, our S5 comparison guide has a full side-by-side breakdown.
Is the TOTO Washlet S7 a replacement for the S500e?
Yes. The S7 is the direct successor to the TOTO Washlet S500e, which has been discontinued. The S7 improves on it with a slimmer 4.1-inch rear profile, a fully seamless seat design, bowl-level EWATER+® cleaning (the S500e only cleaned the wand), a brighter night light that also illuminates the bowl interior, four user presets instead of two, and WASHLET+ compatibility with current TOTO T20/T40 toilets. If you loved the S500e, the S7 is an across-the-board upgrade in every area that matters. You can also explore how it fits in the broader TOTO lineup in our highest rated bidet toilet guide.
Conclusion
The TOTO Washlet S7 earns its flagship status with a combination of hygiene technology, comfort, and build quality that is genuinely hard to match in the bidet seat category.
Bowl-level EWATER+® cleaning, PREMIST®, instantaneous warm water, a seamless seat, four user presets, and an illuminated wall-mountable remote add up to a seat that handles the full bathroom experience without asking anything of you except to sit down. The only meaningful omission compared to the S7A is the auto-open lid — and for most users, that is not a deal-breaker at all.
If you are ready to upgrade, compare the S7 to other top-rated options in our bidet toilet seat comparison chart, or read our full breakdown of the best heated bidet toilet seats to see how it ranks across the entire market.
