TOTO Washlet S7A Review: TOTO's Premium Bidet Seat

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TOTO pioneered the modern bidet seat in 1980, and the Washlet S7A is where four decades of that engineering land today. It is the top of TOTO's mainstream Washlet line, the seat you buy when you want everything TOTO knows how to put into a bidet seat without stepping up to an integrated smart toilet.

At around $1,404, the S7A is a serious purchase. What you get for it is not a longer list of gimmicks but a quieter kind of refinement: a lid that opens before you touch it, a profile so slim the seat looks built-in, and TOTO's EWATER+ working on both the bowl and the wand. Here is what stands out.

What You Get for $1,404

The Washlet S7A (model SW4736AT40#01 in the contemporary lid style) is a fully featured electric bidet seat with warm water rear, front, wide, and soft cleansing, a heated seat, a warm air dryer, a built-in deodorizer, and a nightlight. It runs on standard AC 120V household power.

The headline feature is the auto open and close lid. A sensor detects you approaching and raises the lid; after about a minute of inactivity, it lowers itself. You can also drive the lid and seat from the wireless remote, and the seat is auto-flush compatible if you pair it with a supported TOTO toilet.

The other thing you notice immediately is the profile. At just 4.06 inches tall at the rear, the S7A is one of the slimmest seats TOTO makes. On most toilets it reads as part of the fixture rather than an add-on, which is the look many buyers at this price are paying for.

EWATER+ and PREMIST: TOTO's Hygiene Edge

Two technologies separate the S7A from nearly every competitor, and both are about keeping things clean without any effort from you.

EWATER+

Before and after each use, the S7A mists the bowl and rinses the wand with electrolyzed water. This is ordinary tap water given a mild electrical charge, which turns it into a sanitizing solution that breaks down bacteria on contact. There are no chemicals, no filters, and no cartridges. The bowl stays cleaner between scrubbings, and the wand sanitizes itself every single time.

PREMIST

When you sit down, the S7A mists the inside of the bowl with water. Waste slides off a wet ceramic surface far more easily than a dry one, which means cleaner flushes and less scrubbing. It is automatic, uses very little water, and adds no time to your routine.

Plenty of seats advertise a "self-cleaning" wand that simply rinses with tap water. EWATER+ goes further by making the rinse actively antibacterial, and applying it to the bowl as well as the wand.

Wash Performance

The S7A offers four spray modes: rear, front, wide (a broader rear spray), and soft. Water temperature, pressure, and wand position are all adjustable, and the seat supports both oscillating and pulsating spray. Oscillating moves the wand for wider coverage; pulsating alternates pressure for a gentler, massage-like feel.

Water heating is instantaneous, so the S7A delivers warm water continuously rather than draining a small tank. You will not run out of warm water mid-session, which is the practical advantage of TOTO's instant heater over tank-based seats.

For most people the four modes plus oscillation cover every realistic need. The wide spray in particular is useful for anyone who finds a single narrow stream too precise.

Comfort and Convenience

Heated Seat

The S7A keeps the seat at a consistent, gentle warmth. After a cold January morning on a standard seat, this is the feature most people stop being able to live without. The seat sensor detects when you sit down and activates the wash functions automatically.

Warm Air Dryer

A warm air dryer finishes the wash so you can reduce or skip toilet paper entirely. As with any bidet dryer, a full dry takes around 30 to 60 seconds; many people pat with a single sheet and let the dryer handle the rest.

Deodorizer and Nightlight

A catalytic deodorizer neutralizes odors at the source rather than masking them, and there is no replacement filter to buy. The nightlight casts a soft glow into the bowl so you can find your way at 3 a.m. without flipping on the overhead light.

Installation

The S7A installs on any standard elongated toilet in about 20 to 30 minutes. You will need a GFCI outlet within reach of the toilet, a standard water supply connection (the included T-valve taps into your existing line), and basic tools.

Remove your existing seat, mount the S7A's base plate to the bolt holes, slide the seat on, connect the water supply, and plug it in. No plumber required for the seat itself.

The one common extra cost is the GFCI outlet. If your bathroom does not have one near the toilet, budget $150 to $300 for an electrician. This applies to every electric bidet seat, not just the S7A. For a full walkthrough, see our bidet seat installation guide.

Specs at a Glance

Who Should Buy the TOTO Washlet S7A

It is best for:

• Buyers who want TOTO's best mainstream bidet seat and the hands-free auto lid
• Anyone who wants the seat to look built-in thanks to the ultra-slim profile
• Households that value EWATER+ working on both the bowl and the wand
• People pairing it with a compatible TOTO toilet for auto-flush

You should skip it if:

• You have a round toilet bowl (the S7A is elongated only; the Washlet S5 line offers a round version)
• You do not need the auto lid and want to save several hundred dollars
• A flagship price is hard to justify when the S5 covers the core hygiene tech

How It Compares

The S7A's closest sibling is the Washlet S5, which delivers most of the same hygiene technology for roughly half the price.

The S5 wins on value and bowl compatibility. The S7A wins on automation, the slim look, and auto-flush. If endless warm water and EWATER+ are what you are after, the S5 gets you there for less. If you want the lid to open on its own and the seat to vanish into your bathroom, the S7A is the upgrade.

For a broader look at where the S7A sits against other top seats, see our best electric bidet seats guide. Stepping up from a mid-range pick? Compare it with our TOTO Washlet C5 review.

The Bottom Line

The TOTO Washlet S7A is not trying to win on a spec sheet. It wins on the experience: a lid that opens before you reach it, a seat that looks like it came with the toilet, and TOTO's EWATER+ quietly keeping the bowl and wand clean every time.

At around $1,404 it is a premium purchase, and the Washlet S5 is the smarter buy for anyone who does not need the automation. But if you want TOTO's best mainstream bidet seat with nothing left on the table, the S7A delivers it.

Not sure a premium seat is the right move? Start with our guide on how to choose a bidet or read up on the different types of bidets to match the right seat to your bathroom and budget.