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TOTO Aquia IV 1G WASHLET+ S550e Universal Height One-Piece Toilet – 1.0 GPF and 0.8 GPF

TOTO Aquia IV 1G WASHLET+ S550e Universal Height One-Piece Toilet – 1.0 GPF and 0.8 GPF

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Aquia IV 1G WASHLET+ S550e Universal Height One-Piece Toilet – 1.0 GPF and 0.8 GPF

The Aquia IV 1G WASHLET+ S550e One-Piece Toilet by TOTO pairs the elegant, high-quality Aquia IV toilet with the feature packed S550e WASHLET+ bidet seat. The cords and hoses of most bidet seats remain visible, but the connections of the S550e WASHLET+ are completely hidden thanks to the toilet’s special design. However, do know that if you choose to buy a different seat in the future, the cords and hoses will remain visible.

The high-quality toilet included in this WASHLET+ system features an elegant, skirted design and a stylish chrome push-button flush mechanism. TOTO’s DynaMax Tornado Flush system forcefully sweeps through even the hardest to reach areas of the bowl, and the water flow configuration creates a quiet flush. Two flush options, 1.0 GPF or 0.8 GPF, reduce water usage, and the ceramic bowl is coated with TOTO’s CeFiONtect glaze to prevent waste from sticking. What’s more, this toilet is a universal height, meaning that it’s a bit taller than standard height toilets, making is more accessible for users with bad knees or other mobility difficulties.

The S550e bidet seat included in this WASHLET+ system offers four wash modes (rear, rear soft, front and wide front) and an instant water heater that provides unlimited warm wash water. All the bidet's settings are adjustable, so you can select your optimal seat temperature, water temperature and pressure, and warm air dryer temperature. The oscillating spray option increases wash coverage by moving the wand in a relaxing, back and forth motion, while the pulsating spray option helps stimulate the bowels and soothe tender areas. In addition, the aerated wash stream gently increases wash effectiveness. The seat also comes with a built-in nightlight to aid in moving around the bathroom in the dark, and the automatic deodorizer keeps your restroom smelling fresh. The seat is operated via remote control, and it can even be programmed with the favorite settings of two users for a one-button wash experience. The S550's PREMIST feature coats the bowl with a thin film of water prior to use to discourage waste from sticking, and the S550e’s nozzles self-sterilize after each use with electrolyzed water to keep your unit clean and ready to use. 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 high-end look, universal height, and wide array of features, the Aquia IV 1G WASHLET+ S550e one-piece toilet and bidet will upgrade your bathroom's look and take your your restroom routine to a whole new level.


  • Purchase includes one-piece toilet and WASHLET
  • Elegant, skirted toilet is easy to keep clean
  • Ultra-powerful DynaMax Tornado Flush system with chrome push button
  • Quiet, high-efficiency dual flush (1.0 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 for greater accessibility
  • WASHLET features a dual action spray with four wash modes
  • 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
  • Auto open/close lid
  • Energy saving mode
  • Two programmable user presets
  • EWATER+ automatically sterilizes the bowl and wand with each use
  • Wireless remote control
  • Available in non-auto-flushing and auto-flushing models
  • 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 1G WASHLET+ S550e Universal Height One-Piece Toilet in Cotton White – MW6463056CUMFG(#01)

TOTO Aquia IV 1G WASHLET+ S550e Universal Height One-Piece Toilet with Auto Flushing in Cotton White – MW6463056CUMFGA(#01)

TOTO Elongated Bowl with CeFiONtect– 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 Adapter 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 (Sold Separately) – THU735#BN-A 


WASHLET+ S350e Parts Manual

WASHLET+ S350e Instruction Manual

WASHLET+ S350e Spec Sheet

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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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