TOTO SW305401 S550E Electronic Bidet Toilet Seat with Cleansing Warm, Nightlight, Auto Open and Close Lid, Instantaneous Water

(9 customer reviews)


Product details

Color Cotton White
Brand TOTO
Material Plastic
Style Classic
Shape Oval
Item Weight 15 Pounds

  • A REFRESHING CLEAN FOR EVERYONE – Instant and continuous warm water stream will last as long you need it; AIR-IN WONDER WAVE provides a gentle, yet effective clean every time by infusing air into each droplet; Oscillating and pulsating functions
  • STEP INTO A LAVISH STANDARD OF LIVING – Automatic open/close lid provides a hands-free experience by sensing when users approach and depart; Nightlight gently illuminates the room; Instant and continuous warm water stream will last as long you need it
  • CLEAN INNOVATIONS OFFER PEACE OF MIND – PREMIST helps prevent waste from adhering by misting the toilet bowl before each use; EWATER+ cleans the inside and outside of the wand before and after use and helps to clean the toilet bowl upon departure
  • EMBRACE YOUR UNIQUENESS – The convenient remote allows users to control and set personalized water cleansing settings. Provides luxury and cleanliness at your fingertips; 2 user memory settings for quick access
  • EXPERIENCE EVERYDAY EXCELLENCE – 50 Million WASHLET users agree TOTO electric bidet toilet seats are trusted and dependable with high-quality design for long lasting benefits; Easy, do-it-yourself installation; Top notch customer service support


The TOTO WASHLET S550e Elongated Electric Bidet Toilet Seat with EWATER+ and Auto Open and Close Classic Lid is an electronic luxury seat that cleanses you with warm water, providing an exceptionally clean feeling. Instead of traditional toilet paper that can sometimes be rough and often ineffective, the WASHLET quickly provides comfortable warm water cleansing at the touch of a button. A once mundane trip to the bathroom can become a spa-like experience with a WASHLET

The WASHLET features TOTO’s technologically advanced EWATER+ system which uses electrolyzed water generated by a technologically advanced process, transforming the water into a safe and powerful compound. By misting the bowl after every use, the EWATER+ technology helps to keep your toilet bowl clean and hygienic without any extra harsh chemicals. TOTO’s advanced PREMIST technology prevents toilet bowl waste buildup by using incoming water supply to spray the bowl before every use and help keep it clean

The TOTO WASHLET S550e is operated by a luxury style illuminated touch-activated remote with 2 user memory to save preferred settings. The WASHLET features 5 spray settings, dryer, air purification, auto open and close lid, heated seat, a nightlight, and instantaneous water heating. The newly redesigned lid style lies flush with the toilet bowl, providing a streamlined look and giving the impression of an integrated system. The minimalistic display provides a more subdued appearance to your WASHLET

The WASHLET reduces the need for toilet paper, saving trees and water used to manufacture each roll. As we get older, our mobility can deteriorate and make it increasingly hard to clean ourselves after toileting. Medical conditions and debilitating illnesses can make using the bathroom without assistance almost impossible, but with a WASHLET, you can increase your independence and feel cleaner with just one touch of a button. Includes mounting and connection hardware.

From the manufacturer



WASHLET is a high-tech electronic bidet toilet seat by TOTO, the world’s largest plumbing manufacturer, that installs easily on your current toilet. It delivers advanced technology and innovation to enhance cleanliness and provide the ultimate in personal comfort. The TOTO WASHLET features an adjustable spray that allows you to experience a warm water rinse that cleanses and refreshes you more effectively than harsh toilet paper. You feel cleaner and more comfortable than you’ve ever felt after a bathroom break. Each time you use WASHLET, you are refreshed, rejuvenated, and ready to tackle the day’s next challenge. Take care of yourself and the environment. Live cleanly with WASHLET.

S550e Exclusive Features

Auto Open and Close Lid


Instant warm water

Dryer and deodorizer

Auto Open/Close Seat & Lid

  • The lid automatically opens upon your approach and closes as you depart
  • Provides an exceptional level of luxury and more hygienic bathroom environment

EWATER+ Cleaning

  • Helps keep your toilet fresh by cleaning the bowl and reducing waste after every use
  • Creates peace of mind by cleaning the inside and outside of the wand before and after every use

Instant Warm Water

  • Instantaneous water heating provides immediate comfort and lasts as long as you need it
  • The absence of water heating tank creates a minimalist, streamlined design

Air Dryer & Deodorizer

  • Enjoy the ease and comfort of drying with the temperature-adjustable warm-air dryer
  • The automatic air deodorizer neutralizes bathroom odors by using powerful filters

Join the Clean Revolution

TOTO Advantage

Step by Step

Easy, do-it-yourself installation!

  • Step 1 – Remove your current seat.
  • Step 2 – Install the WASHLET base plate. The rubber grommets can be lubricated with water if needed. Tighten the screws completely.
  • Step 3 – Slide the WASHLET onto the base plate. Check the fit on your toilet and readjust the base plate as needed. A quick release button on the right-hand side allows for easy removal.
  • Step 4 – Connect the tee connector to your fill valve inlet. Connect the WASHLET hose and reconnect the water supply hose.

Fit Guide

Fits Most North American Toilets

  • The WASHLET fits most toilets that feature a standard design.
  • Check the dimensions of your toilet to ensure proper fit and installation.
  • French curves may inhibit proper installation of the WASHLET. Check to ensure adequate space across the width of the tank.
  • Be sure that you are able to access the tank’s fill valve inlet in order to complete the water connection. Extenders are available if space is limited.

What's Included

Included and Required Items

  • Included Items – WASHLET, base plate and installation hardware, tee connector, and remote
  • 120V GFCI outlet required. Rated 15 Amps. Surge protection recommended to protect your WASHLET.
  • The 3.9 foot three-prong power cord originates on the back left-hand side of the WASHLET when facing the toilet.
  • Meets or exceeds electrical and mechanical standards for the US and Canada. IAPMO EGS and cUPC listed.

Optional Accessories

Other Considerations

  • Some toilet designs, such as fully skirted bowls, restrict access to the fill valve inlet. Limited space can prevent completion of the water connection.
  • Check to ensure there is adequate space under your tank to install the tee connector and complete the water connection.
  • Extenders are available if your fill valve inlet is difficult to reach.
  • Additional fittings required for wall-hung toilet installations.

Step by Step

Install Guide

Fit Guide

Fit Chart

What's Included

Required Items

Optional Accessories

Optional Items

Important information

Bulb Voltage

120 volts

Additional information

Weight 15 kg

Cotton White









Operation Mode


Product Dimensions

20.69L x 15.06W

Part Number


Item Weight

15 Pounds

Country of Origin


Item model number



2 AA batteries required. included


Elongated Classic






120 Volts

Item Package Quantity


Temperature Range

86 – 104 Degrees Fahrenheit



Included Components

Electronic bidet seat Tee-connector Remote control with batteries Mounting bracket

Batteries Included


Batteries Required


Battery Cell Type


Warranty Description

Manufacturer One Year Limited



Date First Available

January 5 2017



9 reviews for TOTO SW305401 S550E Electronic Bidet Toilet Seat with Cleansing Warm, Nightlight, Auto Open and Close Lid, Instantaneous Water

  1. Garry R Rooks

    Personal, and nothing short of wonderful.I have had this unit installed for 6 months, and I absolutely love it. The seat is warm in the winter, but I turn the heat off in the summer. The water temperature can be adjusted to my preference, the spray has multiple options, men and women options, pulsating, and the pressure is adjustable. A built in filter for odors, a night light both inside and outside the bowl that comes on when motion activated just like the seat cover will rise when approached. A separate button to make the seat rise for men to stand, and warm air to finish and dry. The extra cleanliness that this offers is fantastic, very little paper used, but a very clean feeling. I really like this seat, and I just don’t see myself without one anymore. I installed one in a second home master bath that has a separate toilet room, but of course no electrical outlet. I installed the new electrical outlet behind the toilet to power the seat, and it was well worth it. These make clean up easy and complete, and the seat always closes on its own which keeps the wife happy too. Nice remote control, and easy mounting holder included. This is a keeper.

  2. Missy

    Great product, easy to install and offers superior hygiene!Replaced the older version of this model ( we had it for 7 years) and it is great. I accidentally applied to much pressure while cleaning the old wand and therefore it no longer worked properly.

  3. WhatsUtalkinAbout

    Toto Is The BestRetired Plumber, been using Toto Toilets and Bidet Seats for 20 plus years. Would not use any other Brand. When the Best Works, why would you ever change.

  4. theo270

    Love the Auto-OpenI have tried two other brands and have a bidet seat in all three of my bathrooms. One had a small leak and then stopped spraying all together. I came across this one when looking for a replacement. I was worried the seat opening would be a bit gimmicky but it reliably opens as soon as I head for the toilet and it’s open about the time I start to reach for it out of habit. I’m now browsing for other brands with auto-open to add to my other bathrooms. Once you get used to the seat opening in one room you start to expect it in others and realize how burdensome it is to have to open your own toilet lid lol.One review was complaining about the hose sticking out 90 degrees. On my unit the hose connection at the seat is on a swivel and you can’t even see it.Another review mentioned you had to press the air dryer button to stop the spraying. I realized later that the first button, a tiny square, is actually a stop button. It isn’t labeled and I didn’t realize initially it was even a button. This was also commented several times on his review, he needs to update it.For the price I think the SWash 1000 is probably a better value, but it doesn’t open automatically! As far as cleaning goes it works great but I actually prefer the sprayer on the SWash series. The Toto one has 2 nozzle type sprays, to me one is like either a sprinkler – too soft even on high or the other is a jet that actually is uncomfortable unless turned down to medium, but it’s still maybe too pinpoint of a stream. Not sure how to describe it. Whereas my SWash seats are firm spraying (also adjustable), maybe a little larger spray but still small enough to feel like it’s cleaning well.Toto has a nicer looking remote and I also like the light. I wish the light inside the bowl would stay on like the nightlight it also has outside the seat. Overall it’s a great seat and I don’t regret getting it, but it would be perfect if the spray was more like the SWash sprayer.UPDATE 5/12/21:I actually now prefer the Toto sprayer, now that I’m used to it the SWash doesn’t feel firm enough to get as good of a cleaning. But most importantly my second Brondell SWash has also started leaking and therefore I recommend staying away from Brondell.

  5. sallayluc2

    TOTO is so worth it.Without a doubt, the best quality bidet seats on the market are made by TOTO. The inexpensive bidet seats are cheaply made and are an embarrassment to your bottom and your bathroom. Save your money if necessary to buy one later, if you can’t add this expense to your budget this month. You can bring it with you if you have to relocate too. TOTO is so worth it.

  6. Paul Pouliot

    Question the Seller – About Open Box or Returned ItemBe Cautious and Aware – we purchased 2 of these but they came from different Amazon sellers. The units from TOTO are first rate 5 star in quality and features. BUT – Amazon and the Seller listed them as NEW but both of them were previously sold, returned or otherwise opened – hence they were “Open Box” or repackaged items. With this particular unit the mounting hardware was used, the second unit had the vent filter installed but the vent cover plate was broken. FYI – After we provided the sale information – TOTO customer service (U.S. based) was quick and agreed to replace any broken parts.

  7. Stealthninjanana

    Bidet on SteroidsThis thing is the bomb diggity…. Clean, clean, clean. Cuts down on tp usage.

  8. Roger N.

    Worth Every Penny To My FamilyThis was an addition to the 2 Washlets we already had installed. Love this specific model that has the Full Featured remote. This remote has the button on top for men to open the lower seat, which is very convenient in contrast to reaching down and pulling up on the seat. All features are top of the line and fully functional. Love the unit

  9. Parmeet Dhillon

    Good qualityGood product

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