TOTO Aquia IV 1G WASHLET+ S550e One-Piece Toilet – 1.0 GPF & 0.8 GPF (Universal Height) SKU: MW6463056CUMFG

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

The TOTO Aquia IV 1G Washlet Universal Height One-Piece Toilet pairs the elegant 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. Additionally, the bidet seat included in this system cannot be installed on a regular toilet due to the configuration of its cords and hoses.

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, yet the water flow configuration results in 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 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. 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 TOTO Aquia IV 1G Washlet Universal Height One-Piece Toilet and bidet will upgrade your bathroom’s look and take 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 – 17-9/16″ seated height
  • 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 Details

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



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Additional information

Weight 116 lbs
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Toilet used

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Heated Seat

Adjustable Nozzle Position

Adjustable Water Pressure

Adjustable Water Temp

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Energy Saving

Water Heating System

Auto Opening

Sittable Lid

Sterilization System


User Presets

Special Spray Options

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Nozzle Oscillation

Pulse Wash

Rear and Front Washes

Seat Sensor

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Self Cleaning Nozzles

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Electrical Requirements


Soft Closing Lid & Seat

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  • How hard is it to install this Washlet+ bidet and toilet system?

    If you can handle the install of a standard toilet, chances are high that you'll be able to install this washlet+ system without any issues. For installation purposes, the setup is simply a toilet with a bidet seat on top of it.

    Answer by : Daniel Johnson on Oct 13, 2020 10:52:22 AM
  • Is there a battery powered version of this bidet?

    Sadly this bidet does not have a battery operated version. This bidet requires too much power to realistically rely on a standard battery, as the electrical pull is too high. This bidet uses a standard 3 prong GFCI outlet.

    Answer by : on Mar 1, 2021 10:40:01 AM
  • How hard is it to install this Washlet+ bidet and toilet system?

    If you can handle the install of a standard toilet, chances are high that you'll be able to install this washlet+ system without any issues. For installation purposes, the setup is simply a toilet with a bidet seat on top of it.

    Answer by : Daniel Johnson on Jun 28, 2023 02:58:47 PM

What our Customers Have Written About us

I discovered Many Bidets through their excellent series of YouTube videos. Very informative in helping with general understanding and specific models and features.

I became sold on Many Bidets through their pre-sales support and advice. I had several questions which I asked both through Chat and via telephone. Both experiences were outstanding - no pressure just clear explanations. They even did some research for one of my questions.

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Many Bidets is a smaller family owned operation but don't let that shake you. They handled my business with a personal touch that you can not get from a major online outlet. Dan made sure that I got the seat I wanted, with the features I needed and beat the best price that I could find anywhere else on the internet.
Once I made the purchase, the seat was delivered in 3 days. Many Bidets has since followed up twice to make sure that my install went well ( it did and it was very easy ) and to make sure I was completely satisfied with my seat.
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Great price, selection and finish options. The customer service agents are very responsive and the delivery process was very clear and well explained. They also followed up after delivery to check on the install and product. I would definitely order from here again and would recommend this place!

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I had originally reached out to Many Bidets through email because I had a question about which type of bidet would fit a one-piece toilet. Someone emailed me back very quickly on a Sunday and was SO helpful. I ended up working with that person directly to then go on and purchase my bidet seat through the company. When it arrived I had some questions involving installation and they answered my email immediately. Their customer service and response time is incredible! Don't give Amazon your money when buying a bidet. Use these guys!

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