Hey guys, Dave here. The TOTO Washlet S7 is TOTO’s premium bidet seat, the one that replaced the S500e in 2023, while its sibling the S7A took over from the S550e. At Bidet King, the S7 runs about $1,223 to $1,407 and the S7A about $1,289 to $1,543, depending on lid style and bowl shape.
For most people shopping a premium bidet seat, the S7 is the TOTO Washlet I’d buy: it gets the S7A’s full wash, EWATER+ bowl and wand cleaning, PREMIST and endless warm water, and only skips the motorized lid. That gap is roughly $66 to $136.
A quick honesty note. I owned and used the TOTO S550e for over a year, and I’ve installed and tested the C5 and K300. I have not tested the S7 or S7A. Everything S7-specific below comes from TOTO’s and Bidet King’s published specs, and anything from my own bathroom is labelled as carried over. If I were buying, I’d go through Bidet King because their support team knows these seats inside and out.
TOTO Washlet S7 Review: Quick Summary Table
The S7 is a fully loaded electronic bidet toilet seat with instantaneous warm water, a 4.1-inch rear profile and every TOTO hygiene feature except the auto lid. Here’s the spec sheet at a glance.
| Spec | TOTO Washlet S7 (S7A where different) |
|---|---|
| Price (Bidet King) | S7: about $1,223 to $1,407 / S7A: about $1,289 to $1,543 |
| Replaces | S7 replaces S500e; S7A replaces S550e |
| Sizes and colors | Elongated and round (round in Contemporary Cotton White); Cotton White, Sedona Beige |
| Lid styles | Contemporary (rounded, seamless) or Classic (beveled) |
| Rear height | 4.1 inches |
| Heater | Instantaneous tankless, endless warm water |
| Spray volume | 0.08 to 0.11 gal/min (about 0.3 to 0.42 L/min) |
| Spray modes | Soft and hard rear, front, wide front; oscillating and pulsating |
| Dryer | Warm air, 5 temperature levels |
| EWATER+ | Wand and bowl, plus manual bowl mist button |
| PREMIST | Yes |
| Deodorizer | Automatic plus Power Deodorizer boost |
| Presets | 4 users |
| Remote | Wireless, horizontal, tactile buttons, illuminated, wall mountable |
| Auto lid | S7: no (SoftClose) / S7A: yes |
| Auto flush | With TOTO’s separate auto flush kit |
| Power | 1,290 W rated, 1,446 W max, 3.9 ft cord |
| Warranty | TOTO’s limited warranty; confirm the term with Bidet King |
S7 vs. S7A: What’s the Difference?
The S7A adds a motorized auto open and close seat and lid, and that is the entire difference. Wash, heater, EWATER+, PREMIST, presets, remote, seamless seat and the 4.1-inch profile are shared between the two.
What Does the S7A’s Automatic Lid and Seat Add?
On the S7A, the lid lifts when you walk up and closes after you walk away. You also get a seat-raise option from the remote, which is handy for guys who’d otherwise grab the seat with their hand.
According to TOTO’s settings, the S7A lets you fine-tune the auto lid timing, so you control how fast it closes after use. The S7 gets TOTO’s SoftClose seat and lid instead, which drop slowly with a light push and never slam.
From my year with the S550e (carried over, since that seat also had the auto lid): I loved it at 2 a.m., when the lid was already open and the nightlight was on. I also noticed I stopped thinking about it after a few weeks. It became background, the way an automatic garage light does.
Who Should Pay More for the S7A?
The S7A earns its extra $66 to $136 in a few situations:
- Mobility or grip issues. Not having to bend and lift a lid helps anyone with back pain or arthritis.
- Fully touch-free households. If you’re adding the auto flush kit, the S7A gets you close to a hands-off routine.
- Shared bathrooms with seat-up arguments. The auto close ends that fight.
If none of those describe you, the S7 gives you the same clean for less. Go figure, the cheaper seat is the smarter buy for most homes.
What Changed from the S500e and S550e
TOTO made the S7 slimmer, easier to wipe down and better at bowl cleaning than the S500e it replaced. A couple of remote changes cut both ways.
A Slimmer Seat Without the Dirt-Collecting Gap
The headline design change is the seamless seat design. On older seats, including my S550e, there was a seam between the seat and the housing where gunk loved to hide. I cleaned mine with a toothbrush more than I’d like to admit.
According to TOTO, the S7’s seat is built to eliminate that gap. Pair that with the 4.1-inch rear height and the seat looks closer to an integrated toilet than a bolt-on.
A New Remote with One Notable Omission
The S7 ships with a new horizontal remote using larger tactile physical buttons in place of the S550e’s touch buttons. It’s illuminated and still wall mountable.
TOTO removed the small LCD screen from the back of the remote. That should help battery life. The catch is that adjusting advanced settings means working without a display, which is harder. More on that in the remote section.
New Cleaning and Odor-Control Options
Three things are new here:
- EWATER+ now covers the wand and bowl, plus a manual bowl mist button on the back of the remote.
- Power Deodorizer adds a boost mode on top of the standard automatic deodorizer.
- TOTO WASHLET+ compatibility means the S7 works on T20/T40 Washlet+ toilets with hidden connections.
If you’re coming from an S550e or comparing older seats, my TOTO S550e vs C5 comparison shows where the last generation landed.
Cleansing Performance
The S7 delivers TOTO’s gentle, aerated warm water cleansing, which is comfortable and effective but softer than the strongest seats out there. Spec sheets and my S550e year line up on that.
How Do the Spray Modes and Flow Rate Compare?
According to the spec sheet, the S7 sprays 0.08 to 0.11 gal/min, about 0.3 to 0.42 L/min. That’s a low flow, and TOTO makes up for it with its air-in wonder wave dual action spray, which mixes air into the water so it feels fuller than the number suggests.
Modes include:
- Soft rear and hard rear
- Front
- Wide front spray
- Oscillating and pulsating options on top
Bidet King notes TOTO sprays aren’t the strongest on the market but are effective and comfortable. For contrast, the Alpha UX Pearl is rated around 0.6 L/min, and Alpha streams in general run 0.6 to 1 L/min. If you want a strong, pressure-washer feel, Alpha wins on paper.
What Can My S550e Experience Tell Us About the Wash?
Carried over from my S550e: the air-in wash felt soft and wide at the low settings and plenty capable at the top pressure setting. I rarely went above the middle of the range.
The oscillating mode was the one I used most, since it covers more area without cranking pressure. My wife used the wide front spray nearly every time.
The S7’s spec sheet lists the same mode family, so I’d expect a similar feel. If your home has weak supply pressure, my notes on bidet water pressure too low cover the fixes.
Hot Water Performance
The S7 uses an instant tankless heater, so warm water keeps coming for as long as you wash. That’s the feature I’d least want to give up.
Does the Tankless Heater Deliver Continuous Warm Water?
According to TOTO, the S7 heats water on demand as it flows past the heating element, giving continuous warm water. No reservoir means nothing to run out, whether it’s one long wash or four people back to back.
The spec sheet lets you set the water temperature across several levels, and it applies per preset, so each user gets their own temp.
How Does It Compare with My C5 and S550e Experience?
Carried over from my own testing:
- S550e (tankless): It never ran cool on me in over a year, even during long washes.
- C5 (tank): The warm water started running cool at about 40 seconds in my test.
Forty seconds covers most normal washes, but it’s noticeable on a long one or when two people go back to back. You can read the full rundown in my TOTO C5 Washlet review.
Since the S7 shares the S550e’s tankless approach, endless warm water is what TOTO promises here. If you’re shopping heaters specifically, see my list of the best bidet seats with tankless water heaters.
Design, Lid Styles and Dimensions
The S7 is one of the slimmest TOTO bidet seats you can buy, with two lid styles and two colors. It looks like part of the toilet once it’s on.
Contemporary vs. Classic Lids
- Contemporary: rounded, seamless lines. This is the modern look and the only style offered in a round bowl.
- Classic: a beveled lid edge that suits traditional bathrooms with crown molding or shaker vanities.
Both styles share the same heated bidet seat and features. Pick based on your bathroom, since the lid edge is what you’ll see every day.
Colors, Bowl Shapes and the 4.1-Inch Rear Profile
Colors are Cotton White and Sedona Beige. Match the beige to your china carefully, since beige shades vary across toilet brands.
Bowl shapes:
- Elongated in both lid styles and both colors
- Round in Contemporary Cotton White only
The rear housing is 4.1 inches tall, one of the slimmest on the market. On my S550e (carried over) the bulky back was the part guests noticed first, so this is a real visual upgrade.
Fit and Installation
The S7 fits most standard round and elongated toilets plus TOTO’s T20/T40 Washlet+ bowls, and you’ll need an outlet within reach of the 3.9-foot cord.
Will It Fit a Regular Toilet or a T20/T40 WASHLET+ Bowl?
On a regular TOTO toilet or most other brands, the S7 mounts with a docking plate bolted through the seat holes, then slides on and clicks into place. Measure your bowl first: round bowls run about 16.5 inches from the bolt holes to the front rim, elongated about 18.5 inches.
On a T20/T40 Washlet+ bowl, the TOTO Washlet+ S7 (model SW4726AT40#01 is the elongated Contemporary Cotton White version) hides the water hose and cord behind the toilet. That’s the cleanest look you’ll get short of a full Neorest. For more on pairing, see my guide to bidets for TOTO toilets.
What Electrical and Water Connections Do You Need?
Here’s the checklist for this electric bidet seat:
- A grounded GFCI outlet within 3.9 feet of the seat’s side. Skip extension cords.
- A T-valve on your toilet’s cold supply line (included), feeding the seat.
- The docking plate bolted to the bowl.
TOTO says installation takes about 45 minutes. My C5 and K300 installs (carried over) took about that, with the outlet location being the only real hurdle. My guide to installing a bidet walks the steps.
When Is Auto Flush an Option?
Auto flush works with TOTO’s separately sold auto flush kit, which attaches to the toilet’s flush mechanism. It’s designed for compatible TOTO toilets, so confirm your model before ordering the kit. With the S7A’s auto lid plus auto flush, the routine becomes nearly touch-free.
Remote Control and Presets
The S7’s wireless remote is easier for everyday use than the S550e’s and harder for deep settings. Four user presets help a lot in shared bathrooms.
Are the Physical Buttons Easier to Use?
Yes. The new horizontal remote uses larger tactile buttons you can find by feel. On my S550e (carried over), the touch buttons sometimes needed a second press, and older family members struggled to tell them apart.
The buttons are illuminated for nighttime use, and the remote mounts on the wall in its holder. Front-of-remote controls cover:
- Rear and front wash, stop
- Pressure and position
- Oscillating and pulsating
- Dryer
- Preset buttons
How Do the Four Presets and Advanced Settings Work?
The four user presets store each person’s water temp, seat temp, pressure and nozzle position. Press your number, sit, wash. In my house that ended the “who changed the pressure?” complaints.
Advanced settings live on buttons on the back of the remote, including the manual EWATER+ bowl mist. Without the old LCD, you adjust things like power-saving schedules, LED night mode and (on the S7A) auto lid timing by button sequences and indicator lights. Keep the manual handy for the first week. Once it’s set, you’ll rarely touch it again.
EWATER+, PREMIST and the Power Deodorizer
The S7 bundles three hygiene systems: EWATER+ cleans the wand and bowl, PREMIST wets the bowl before use, and the deodorizer handles odor with a new boost mode.
What Do EWATER+ and PREMIST Actually Clean?
EWATER+ turns tap water into electrolyzed water and mists the wand inside and out before and after each use, then mists the bowl after use. According to TOTO, that slows grime and odor buildup between cleanings. On my S550e (carried over), EWATER+ only covered the wand, and I noticed the wand stayed clean but the bowl still needed regular scrubbing.
PREMIST sprays the bowl just before use so waste is less likely to stick and washes away on the flush. Neither replaces cleaning, but both stretch the time between scrubs. My complete guide to cleaning a bidet covers the rest.
When Is the Manual Bowl Mist Useful?
The new manual EWATER+ bowl mist button on the back of the remote gives the bowl an extra dose on demand. Times I’d use it:
- After a sick day in the house
- Before guests arrive
- After a heavy use stretch, like a party
How Does the Deodorizer Boost Work?
The automatic air deodorizer runs a fan through a filter whenever someone sits. The Power Deodorizer boost cranks it up for tougher situations. My S550e’s standard deodorizer (carried over) handled normal use fine, but I’d have used a boost after some meals. Plan on cleaning the deodorizer filter every few months.
Warm Air Dryer and Heated Seat
The S7 gives you five levels each on the dryer and heated seat, plus a nightlight with a night mode. Comfort features are excellent; drying speed is the weak spot every bidet seat shares.
How Adjustable Are the Seat and Dryer?
According to TOTO:
- Heated seat: 5 temperature settings, plus off
- Warm air dryer: 5 temperature levels
- Nightlight: lights the seat and bowl, with an LED night mode you can schedule
The heated seat was the feature I missed most whenever I traveled with my S550e out of reach (carried over). The S7 also uses a seat sensor, so the wash only runs when someone is seated.
Will the Dryer Replace Toilet Paper?
Partially. On my S550e, C5 and K300 (carried over), the dryer took a few minutes to fully dry me, longer than most people want to sit. I ended up running it 30 to 60 seconds and finishing with one or two squares of paper.
That still cut my household paper use way down. I’d expect the same pattern on the S7, since TOTO hasn’t published a faster drying spec. If drying speed is a dealbreaker, no seat I’ve tried fully solves it.
Energy Use
The S7’s instant heater draws heavy power only while it’s heating water, which keeps standby use lower than a tank seat that holds water warm all day.
What Do the Power Ratings Mean?
TOTO rates the S7 at 1,290 W, with a maximum of 1,446 W. That peak happens when the tankless heater kicks in during a wash, and at the same time the seat heater and dryer may be running.
That’s why a dedicated GFCI outlet helps. If your bathroom circuit also runs a hair dryer, running both at once could trip a breaker. TOTO doesn’t publish an annual kWh figure for the S7, so I won’t guess one.
How Do Heating and Power-Saving Settings Affect Use?
Most standby power goes into the heated seat. You’ve got a few levers:
- Lower seat temperature a notch or two in summer.
- Automatic energy saver, which learns low-use hours and drops the seat temperature.
- Programmable power-saving schedules, such as overnight or during work hours.
On my S550e (carried over), I set a schedule for workday hours and the seat was back to temp before anyone noticed. For more on how heaters work, see how do warm water bidets work.
S7 vs. Alpha UX Pearl vs. TOTO K300
The S7 wins on hygiene features and design, the Alpha UX Pearl wins on spray strength and price, and the K300 sits in between as the value TOTO pick.
How Do Price, Spray Strength and Features Compare?
| Criteria | TOTO S7 | Alpha UX Pearl | TOTO K300 |
|---|---|---|---|
| Price | $1,223 to $1,407 | About $459 | $699 to $725 |
| Spray volume | 0.3 to 0.42 L/min | About 0.6 L/min | Gentle, aerated |
| Water heater | Tankless | Tankless | Tankless |
| EWATER+ | Wand and bowl | No | Yes |
| Rear profile | 4.1 in, seamless | Standard | Compact |
| Warranty | Confirm with Bidet King | 3 years | Confirm with retailer |
The TOTO Washlet S5 at about $668 is also worth a look if you want the TOTO remote and EWATER+ without the S7’s slimmer profile.
Which Seat Offers the Best Value for Your Priorities?
Alpha UX Pearl: At about a third of the S7’s price, it brings tankless warm water and a stronger spray, backed by a 3-year warranty. If wash strength and budget come first, it’s the easy pick.
TOTO K300: I’ve installed and tested it, and it gave me TOTO’s gentle wash and endless warm water for roughly half the S7’s price. See my full TOTO K300 review.
TOTO S7: You pay for the slim seamless design, wand and bowl EWATER+, PREMIST, Power Deodorizer, four presets and Washlet+ compatibility. That’s for a primary bathroom you want to look high-end and stay cleaner longer.
Who Should Buy the S7 or S7A?
The S7 suits people who want TOTO’s best hygiene and design and are fine lifting a lid. The S7A suits mobility needs and fully touch-free setups, and cheaper seats suit everyone else.
When Is the S7 Worth Its Premium Price?
The S7 earns its price if you:
- Want the slimmest, cleanest-looking TOTO seat for a main bathroom
- Hate scrubbing toilets and value EWATER+ on the bowl plus PREMIST
- Share a bathroom and need four presets
- Own or plan to buy a T20/T40 Washlet+ toilet for hidden connections
- Prefer TOTO’s gentle aerated wash over a strong jet
When Should You Choose the S7A or Spend Less?
Choose the S7A if bending to lift a lid is uncomfortable, or if you’re adding the auto flush kit for a touch-free routine. The $66 to $136 gap is small at this price level.
Spend less if:
- You want a stronger spray: Alpha UX Pearl at about $459.
- You want TOTO quality on a budget: K300 at $699 to $725, or S5 at about $668.
- It’s a guest bathroom: the high-end extras get little use there.
Why the S7 Is My Pick Unless You Want the Auto Lid
The S7 is the TOTO I’d put in my own main bathroom. It carries everything I liked about my S550e (endless warm water, the gentle air-in wash, four presets) and fixes the gap that collected gunk on my old seat.
Add the 4.1-inch profile, EWATER+ on the bowl, the manual bowl mist and the Power Deodorizer, and the upgrades are meaningful. The missing LCD on the remote is a minor annoyance once settings are dialed in.
Pay the extra for the S7A only if the motorized lid solves a real problem for someone in your home. If budget or spray strength matters more, the K300 or Alpha UX Pearl covers the basics for far less.
If I were ordering, I’d buy through Bidet King at about $1,223 to $1,407, since their support team can confirm bowl fit and the current warranty term before the seat ships. There you have it.
Ready to order? You can check current prices on the TOTO Washlet S7 at Bidet King here (affiliate link). Bidet King handles TOTO warranty claims and support, which is why I buy there.