TOTO S7 vs S7A: The Upgrade That May Not Be Worth It

Choosing between the TOTO Washlet S7 and S7A is one of the most focused decisions you’ll face at the top of the WASHLET lineup.

Both seats are nearly identical — but the one difference between them could change everything about your daily bathroom routine, and this breakdown will help you decide if it’s worth it for you.

Feature	TOTO Washlet S7	TOTO Washlet S7A
Image
Dimensions (L x W x H)	21″ x 15″ x 4.1″	21″ x 15″ x 4.1″
Auto Open/Close Lid	No	Yes
EWATER+ Coverage	Wand & Bowl	Wand & Bowl
PREMIST	Yes	Yes
Water Heating	Instantaneous (tankless)	Instantaneous (tankless)
User Memory Presets	4	4
Auto Flush Compatible	Yes (kit sold separately)	Yes (kit sold separately)
Warranty	2 years	2 years
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1. TOTO WASHLET S7 Electronic Bidet Toilet Seat (SW4726AT40#01)

The TOTO Washlet S7 is the current flagship bidet seat from the world’s leading toilet manufacturer, replacing the discontinued S500e with a slimmer profile, expanded hygiene technology, and a premium new remote.

It delivers everything you’d want from a top-of-the-line seat — full EWATER+ bowl and wand cleaning, unlimited warm water, four user presets, and an ultra-slim 4.1″ rear height that makes it look almost like an integrated bidet toilet.

Features

Full EWATER+ cleaning for both the wand and the toilet bowl after every use
PREMIST automatically wets the bowl before each use to prevent waste adhesion
Instantaneous tankless water heating — unlimited warm water with no wait
5 spray settings including rear, front, wide, soft, and oscillating/pulsating modes
4-user memory presets with illuminated touch-button wireless remote
Ultra-slim 4.1″ rear height with seamless lid design flush to the bowl
Built-in air deodorizer, heated SoftClose seat, warm air dryer with 5 temperature levels
LED nightlight illuminating both the bowl and seat controls
Auto Flush capable with optional kit on compatible TOTO T20/T40 toilets
Compatible with WASHLET+ toilets for concealed cord and water supply

Pros

Most advanced hygiene technology in a bidet seat — EWATER+ on both wand and bowl
Exceptionally slim profile that rivals the look of an integrated unit
Lower cost than the S7A without sacrificing any wash features
Premium wireless remote with tactile metal buttons and fine-tune settings on the back
2-year warranty — longer than most competing seats

Cons

No automatic lid opening or closing — you must lift the lid manually
Remote lacks an LCD screen, making advanced settings less intuitive to change
Elongated only — no round bowl version available in this model

The S7 gives you the full TOTO flagship experience without paying extra for a motorized lid you may not need. For couples or families who share one bathroom, the four user memory presets mean everyone’s settings are saved and ready — no adjusting every time. If you want to see how the S7 compares to a step below it in the lineup, our TOTO C5 vs S7 breakdown explains exactly what you’re gaining at this tier.

Check its current price on Amazon

2. TOTO WASHLET S7A Electronic Bidet Toilet Seat (SW4736AT40#01)

The TOTO Washlet S7A is the absolute pinnacle of TOTO’s bidet seat lineup — identical to the S7 in every way except for one key addition: a touchless automatic lid that opens when you approach the toilet and closes quietly when you walk away.

This single feature makes it TOTO’s most luxurious and hands-free seat, replacing the discontinued S550e and adding meaningful upgrades in profile, hygiene coverage, and remote design.

Features

Everything included in the S7 — EWATER+ wand and bowl cleaning, PREMIST, instantaneous heating
Automatic open/close lid triggered by proximity sensor — no touching required
Auto lid close can be programmed to happen before flushing for improved hygiene
4-user memory presets on the same premium illuminated wireless remote as the S7
5 spray settings, heated seat, warm air dryer, deodorizer, and LED nightlight
4.1″ ultra-slim rear height — same seamless, flush-to-bowl look as the S7
Auto Flush capable with optional kit on compatible TOTO T20/T40 toilets
Compatible with WASHLET+ toilets for fully concealed installation
Available in Contemporary and Classic lid styles, Cotton White and Sedona Beige

Pros

Fully hands-free experience from entry to exit — the ultimate in touchless hygiene
Auto lid prevents odors from escaping and keeps the bowl protected between uses
Ideal for households with children, elderly users, or anyone with limited mobility
Same 2-year warranty and identical wash performance as the S7
Programmable auto-close timing works seamlessly with optional auto-flush kit

Cons

Higher cost than the S7 for a single added feature
Proximity sensor can trigger during renovations or when the bathroom door stays open — though it can be turned off
Elongated only — same limitation as the S7

The S7A is the seat for buyers who want zero contact from the moment they walk into the bathroom until the moment they leave. If you’re designing a primary bathroom with a seamless, spa-like experience in mind, the automatic lid is a daily luxury that genuinely improves hygiene. If you’ve been comparing it to a full smart toilet setup, our guide to the highest rated bidet toilets can help you decide whether a seat or a full unit makes more sense for your space.

Check its current price on Amazon

Head-to-Head: TOTO S7 vs S7A

Wash Performance

This is the one category where the S7 and S7A are completely, definitively equal.

Both use TOTO’s instantaneous tankless water heater, meaning you get unlimited warm water from the first second of use — no tank to run dry, no cold surprise mid-wash.

Both deploy PREMIST before every use, coating the interior of the bowl with water so waste doesn’t stick to the porcelain.

Both deliver full EWATER+ coverage — the wand gets sanitized with electrolyzed water before and after every use, and the bowl gets misted automatically after you leave, reducing the need for harsh chemical cleaners.

Both offer five spray settings with oscillating and pulsating modes, five levels of water temperature and pressure, and an adjustable nozzle position.

If you’re upgrading from an older heated seat and want to understand what this generation of EWATER+ coverage means in practice, check out our guide to best heated bidet toilet seats for broader context.

Winner: Tie — wash performance is byte-for-byte identical between the two seats.

Lid Convenience & Hands-Free Use

This is the one and only category where the S7A separates itself from the S7 — and it’s a meaningful one for the right buyer.

The S7A’s lid opens automatically when you approach the toilet, triggered by a proximity sensor built into the unit.

When you’re done, it closes on its own — quietly and smoothly.

You can also program it to close automatically before flushing, which is a real hygiene benefit for anyone who cares about aerosol contamination.

The S7, by contrast, uses a standard soft-close SoftClose lid that you lift and lower manually.

It’s comfortable and sturdy, but it requires physical contact every single time — something that matters more in households with young children, older adults, or anyone managing a physical limitation.

If accessibility is a priority for your household, our guide to the best bidets for existing toilets covers hands-free features in more depth.

Winner: TOTO Washlet S7A — the automatic lid is the only functional difference, and for primary bathrooms, it’s a daily upgrade that adds up across thousands of uses.

Design & Profile

Both the S7 and S7A share an identical ultra-slim profile, sitting at just 4.1 inches at the rear — one of the lowest seat heights available in any electric bidet seat today.

That slim height gives both seats a look that borders on an integrated unit, especially when paired with a TOTO WASHLET+ ready toilet that conceals the power cord and water supply hose inside the wall.

Both come in Contemporary (smooth, rounded lid) and Classic (beveled edge lid) styles, and both are available in Cotton White and Sedona Beige.

If you need help deciding between TOTO’s color options, our guide to TOTO Colonial White vs Cotton White covers the differences in detail — though it’s worth noting that Colonial White is not available on the S7 or S7A.

The S7A does add a proximity sensor housing near the rear of the lid, but the difference is essentially invisible in person.

Winner: Tie — both seats look and feel premium at 4.1″ and the aesthetic gap between them is negligible.

Compatibility & Installation

Installation is identical for both seats.

You need a standard elongated bowl, a cold water supply line, and a 120V GFCI outlet within reach of the unit’s 3.9-foot power cord.

Both seats attach to the bowl via the same base plate and T-connector system, and both are fully compatible with TOTO T20 and T40 WASHLET+ ready toilets for a clean, cord-concealed installation.

Neither seat requires a plumber for standard installation — most buyers complete the setup in under an hour.

If you’re pairing either seat with a wall-hung toilet setup, our TOTO AP vs EP comparison walks through the full WASHLET+ integration process for wall-hung configurations.

Auto Flush capability is available on both, but requires the separately sold auto-flush kit and a compatible TOTO toilet — it doesn’t come standard with either seat.

Winner: Tie — installation, compatibility, and WASHLET+ integration are identical between the two models.

Value

The S7 and S7A are priced differently, with the S7A commanding a premium that reflects the cost of the auto-open lid mechanism and proximity sensor.

Whether that premium is worth it comes down entirely to how much the hands-free lid matters in your daily routine.

If you share the bathroom and the lid gets touched dozens of times a day, the S7A’s touchless design pays dividends in hygiene and convenience every single time.

If you live alone or the auto-lid simply doesn’t move the needle for you, the S7 delivers every other premium feature — including the identical wash, the same slim profile, the same remote, and the same 2-year warranty — at a lower investment.

For a broader look at how these seats compare to other premium options from competing brands, the bidet toilet seat comparison chart gives you a solid reference point.

Winner: TOTO Washlet S7 — for buyers who don’t specifically want the auto lid, the S7 offers better value per dollar with no trade-offs in performance.

Verdict: Which One Should You Buy?

Both the S7 and S7A are outstanding seats — the best bidet seats TOTO makes — and the right answer comes down to one question: does a fully hands-free lid matter to you?

Buy the TOTO Washlet S7 if…

You want TOTO’s full flagship wash experience without paying extra for a motorized lid
You’re installing it in a guest bathroom, vacation home, or secondary bathroom where the auto lid is less impactful
You’re comparing it against competing premium brands and want the best TOTO at the most accessible flagship price — see how it stacks up in our Brondell Swash 1400 vs TOTO S5 comparison for context on what TOTO brings versus other top brands
A manual soft-close lid is completely fine for your household

Buy the TOTO Washlet S7A if…

You want a completely touchless bathroom experience from the moment you walk in
Your household includes young children, elderly parents, or anyone with limited hand mobility
You’re designing a primary bathroom where the auto lid is a daily luxury across multiple users
You’re already investing in a full WASHLET+ toilet setup — pairing the S7A with a compatible TOTO toilet like those in our AP vs EP guide gives you an almost fully integrated experience

FAQ

What is the only difference between the TOTO S7 and S7A?

The sole difference is the automatic open/close lid on the S7A.

The S7A uses a proximity sensor to open the lid when you approach the toilet and close it when you walk away.

Every other feature — EWATER+ cleaning, PREMIST, water heating, spray settings, remote, user presets, dryer, deodorizer, nightlight, and warranty — is completely identical between the two seats.

Do the S7 and S7A work on standard toilets, or only TOTO toilets?

Both seats work on most standard elongated toilet bowls from any manufacturer, not just TOTO.

They are also WASHLET+ compatible, meaning you can pair them with TOTO T20/T40 WASHLET+ ready toilets to conceal the power cord and water supply hose for a fully integrated look.

The Auto Flush feature, however, requires both a compatible TOTO toilet and the separately purchased auto-flush kit.

Is the S7A worth the extra cost over the S7?

It depends entirely on how much a hands-free lid matters to your daily routine.

For primary bathrooms with multiple users, the S7A’s automatic lid is a genuine daily convenience and hygiene improvement — touching the lid becomes a thing of the past.

For secondary bathrooms or households where the lid behavior isn’t a priority, the S7 delivers the exact same wash quality and premium features at a lower cost.

Both are exceptional seats — the decision is personal rather than about performance. You can also explore our full bidet comparison guides to see how both stack up across the wider TOTO and non-TOTO lineup.

What did the S7 and S7A replace?

The TOTO Washlet S7 replaced the discontinued S500e, and the S7A replaced the discontinued S550e.

Both new models brought meaningful upgrades over their predecessors: a slimmer 4.1″ rear height (down from approximately 4.5″), expanded EWATER+ coverage that now includes the toilet bowl (not just the wand), a redesigned lid that sits flush with the bowl, updated WASHLET+ compatibility for T20 and T40 toilets, and a new premium remote with tactile metal buttons.

If you’re coming from either of those older seats, the upgrade to the S7 or S7A is significant on multiple fronts.

Conclusion

The TOTO S7 vs S7A decision is one of the clearest in the bidet world — and that’s actually a good thing.

You’re not choosing between two different performance levels or two different hygiene technologies.

You’re choosing whether a touchless automatic lid is worth a price premium to you.

If your answer is yes — especially in a primary bathroom with multiple daily users — the S7A justifies every penny.

If your answer is no, or if you’re outfitting a secondary space, the S7 is an equally outstanding seat that holds nothing back in terms of what matters most: the wash itself.

Either way, you’re getting TOTO’s most refined EWATER+ technology, a premium remote with four user presets, unlimited warm water, and a seat profile so slim it competes visually with full integrated bidet toilets.

For more context on where these seats sit in the broader TOTO lineup, our bidet toilet seat comparison chart is a great next read.

And if you’re weighing TOTO against other top brands before committing, our best bidet brands guide and the Brondell CL1700 vs TOTO S2 comparison give you useful perspective on what sets TOTO apart at every price point.