TOTO Aquia IV WASHLET+ S550e One-Piece Toilet, Universal Height – 1.28 GPF and 0.8 GPF

TOTO Aquia IV WASHLET+ S550e One-Piece Toilet, Universal Height – 1.28 GPF and 0.8 GPF

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Aquia IV WASHLET+ S550e One-Piece Toilet, Universal Height – 1.28 GPF and 0.8 GPF

TOTO's Aquia IV S550e WASHLET+ One-Piece Toilet and Bidet System with dual flushing (1.28 and 0.8 GPF) beautifully combines efficiency, comfort, style and accessibility. The toilet and bidet seat components are specially designed for one another so that the seat’s water hose and power cord are hidden from view for a sleek overall look. Please note, however, that only the toilet and WASHLET included in this WASHLET+ system will fit together in such a way that the cords and connections are kept out of sight.

The Aquia IV toilet itself features TOTO’s DynaMax Tornado Flush system, which powerfully sweeps through even the hardest to reach areas of the bowl, along with two flush options (1.28 GPF or 0.8 GPF) for optimal water efficiency. This Aquia IV model is a one-piece toilet, meaning the tank and bowl are crafted from one continuous piece of porcelain for a seamless look, and it features an attractive push-button flushing mechanism. The toilet has a stylish, skirted design that discourages the build-up of dirt and is simple to clean, and it is a universal height, so it’s slightly taller than standard height toilets and therefore accessible to a wider range of users. 

The S550e WASHLET+ bidet seat that comes with this system is just as sleek as the toilet itself and is equipped with a wide range of luxury features. First, the S550e’s four wash modes (rear, rear soft, front and wide front) come with adjustable water temperature and pressure, as well as an aerated wash stream for additional soothing and cleansing. The oscillating spray option increases wash coverage and cleaning power, and the pulsating spray feature both relaxes tender areas and aids in stimulating the bowels. You’ll never run out of warm wash water thanks to the S550e’s instant water heating system, and the adjustable warm air dryer means you won’t need to waste toilet paper drying off. In addition, the adjustable heated seat keeps your tush warm while the automatic deodorizer gets rid of bathroom odors at the source. A convenient built-in nightlight makes it easier and safer to use the restroom in the dark, and the lid senses when you’re approaching or leaving the bathroom and automatically opens and closes accordingly. The WASHLET is operated via a convenient remote with two user presets that allow frequent users to pre-program their favorite settings for a personalized, one-button wash. The S550e is easy to keep clean thanks to PREMIST function and the bowl’s ultra-smooth CeFiONtect glaze, which work together to create a slippery surface that keeps waste and dirt at bay. The S550e’s nozzles also automatically self-sterilize with electrolyzed water after each use for added hygiene. Last but not least, this system is available in both non-auto flushing and auto-flushing models, the latter of which flushes the toilet when a user stands up and moves away from the unit.

With its classy silhouette and top of the line features, the Aquia IV WASHLET+ S550e One-Piece Toilet and Bidet System (1.28 and 0.8 GPF) is guaranteed to take your toileting experience to the next level!



  • Purchase includes one-piece toilet and WASHLET
  • Elegant, skirted toilet is easy to keep clean
  • Ultra high-efficiency DynaMax Tornado Flush system with chrome push button
  • Quiet, dual flush (1.28 GPF or 0.8 GPF)
  • CeFiONtect glaze and PREMIST feature stop residue from sticking to bowl
  • 2.5” trapway with clear glaze helps prevent clogs
  • Universal height
  • WASHLET features a dual action spray with four wash modes and oscillating and pulsating spray options
  • Soothing, aerated wash stream provides superior relaxation and cleansing 
  • Instant water heating system ensures unlimited warm wash water
  • Adjustable water temperature and pressure
  • Warm air dryer with five temperature settings
  • Adjustable heated seat with quick release feature for easy cleaning
  • Automatic deodorizer
  • Built in nightlight
  • Automatic open/close lid
  • Energy saving mode
  • Two programmable user presets
  • EWATER+ automatically sterilizes the bowl and wand with each use
  • Available in non-auto flushing and auto-flushing models
  • Wireless remote control
  • Comes in white
  • Elongated bowl and seat
  • 12” rough-in (10” and 14” rough-in unifit components can be purchased separately)
  • 1 year warranty


Additional Information

Model Number(s)

TOTO Aquia IV WASHLET+ S550e One Piece Toilet and Bidet System in Cotton White – MW6463056CEMFG(#01)

TOTO Aquia IV WASHLET+ S550e One Piece Toilet and Bidet System in Cotton White  with Auto Flushing – MW6463056CEMFGA(#01)

TOTO Aquia IV Elongated Bowl – CST646CEMFGAT40

TOTO WASHLET S550e with Contemporary Design, non Auto Flush Compatible – SW3056T40

TOTO WASHLET S550e with Contemporary Design, Auto Flush Compatible – SW3056AT40

TOTO WASHLET Adapter – 9AU321-A

TOTO Auto Flush Kit – THU765

Optional Unifit 10” Rough-In (Sold Separately) – TSU08W.10

Optional Unifit 14” Rough-In (Sold Separately) – TSU08W.14

Push Button Assembly in Cotton White (Sold Separately) – THU735#01-A

Push Button Assembly in Polished Nickel (Sold Separately) – THU735#PN-A

Push Button Assembly in Brushed Nickel (Sold Separately) – THU735#BN-A


WASHLET+ S350e Parts Manual

WASHLET+ S350e Instruction Manual

WASHLET+ S350e Spec Sheet

Write a Review

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  • Works Great!

    Posted by Bill Z on 16th May 2019

    I ended up choosing the TOTO Aquia IV Washlet+ S550e one-Piece Toilet - 1.28 GPF and 0.8 GPF and it works great! Best price, delivered as I was told even though there was a parts delay for the auto flush. I highly recommend Dan and Many Bidets

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The TOTO Washlet+ comes with a 1 year full warranty for residential use, and a 1 year full warranty for units installed for commercial use.


We cover tax at the prices quoted, so no need to worry about a surprise tax fee added on during checkout, we've got you covered!


We also pay for shipping, so the price you see is the price you get!

TOTO Washlet+ units ship via freight, and ships on a pallet.  The shipper will call you when the unit is in your area and ready to be delivered. This allows you to schedule delivery, so you don't need to worry about it being delivered when you're not home.  Because toilet bowls are fragile, we recommend looking over the unit quickly when it arrives.  It's very rare for anything to be cracked, but it has happened.  We see about a 5% break rate, meaning about 1 in 20 have damage. When the unit arrives, look it over before signing for it. If anything is broken, don't sign for the package. Instead, take pictures and email them to or text them to 248-974-4030, and refuse delivery. This allows us to file a claim with the shipper and get another one out to you within 24 hours.


Because of the fragile nature of toilet bowls, returning one is a tricky process.  Should a return be required on your Washlet+ unit, TOTO requires that it be shipped back via freight, and shipped back on a pallet.  TOTO also charges a restocking fee of 30%, and will not cover shipping either way. TOTO also requires that the unit come back in 100% brand new condition. If the unit comes back in any condition other than 100% brand new, resellable condition, no refund of any sort will be issued.

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