TOTO Aquia IV WASHLET+ S550e One-Piece Toilet – 1.28 GPF and 0.8 GPF (Universal Height) SKU: MW6463056CEMFG

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

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 and style. 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 the bidet seat included in this system will not fit on a regular toilet due to the configuration of its cords and hoses. Similarly, the toilet included in this system will only conceal the cords and hoses of the accompanying bidet seat (you can install a different bidet seat later on, but the cords and hoses will remain visible).

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 it is a universal height, so it’s 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+ bidet seat
  • 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 – 17-9/16″ seated 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 Details

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


2 reviews for TOTO Aquia IV WASHLET+ S550e One-Piece Toilet – 1.28 GPF and 0.8 GPF (Universal Height) SKU: MW6463056CEMFG

  1. Douglas Michon (verified owner)

    ManyBidets – The shipping was prompt, and the communication and packaging were excellent. I initially thought that we had a defective part, and Dan called me up and helped start the claim process. As it turns out, I missed something during my installation setup.

    Previous Experience – We owned two Coco Bidets, the last of which was the 9500X. Both of our Cocos lasted three years and then the functions started dying. The Cocos were an affordable introduction to bidets, but we wanted something that lasted longer, was easier to clean, and wanted to try a Toto. Our toilet was 25 years old, tough to clean, and we have a small bathroom and tiny spot for the toilet. I wanted to reclaim the space from the two water connection hoses and the bidet control arm so I wouldn’t have to stick my head inside the remaining hole to clean the side of the toilet. This Washlet+ combination was a great choice.

    Installation: If you want all the plumbing tucked behind this Washlet+, be prepared to make an incredibly short pipe connection coming out of your wall – I sweat that one, but it looks fantastic. The toilet seems so much smaller without the water hoses and bidet arm. It looks sleek!

    Aquia IV Toilet: I read a few reviews that said the Cefiontect didn’t do much to keep the bowl clean, and the relatively flat upper portion of the bowl always left some poo on the bowl. I’d like to emphatically say that this is not what we experienced. The flush is quiet, very fast, and very effective. We barely need the 1.28GPF; now I can see why they offer a 0.8/1.28GPF option. After a week of family use it looks like we’ve never used this thing. The seat is higher than we’re used to, which is initially odd, but okay.

    S550e seat: No regrets! Worth every penny! Our old bidet seat took 5 times longer to clean us and we often had to repeat with two or three cycles. The dryer took a couple minutes to dry us off. This seat is a complete hands-free experience and leaves us spotless in no time. The deodorizer is amazing – we have tried but haven’t been able to notice even a whiff while we’re doing our business, or afterwards. The seat is elongated, but is definitely smaller than our old bidet. This adds more space to our bathroom, and we quickly became used to what we call the Japanese-butt-sized seat. As hoped, we can stumble into the bathroom in the dark of night, not turn on any lights, and the Toto lights the way.

    Auto-flush: This is so well thought out – I’m impressed. The low flush is activated when the seat is lifted during use, for the gents. The low flush is also activated when someone is seated for less than 30 seconds, for the ladies. The toilet pauses after you exit before it flushes. This allows you to get up, press the low- or full-flush button, and walk away for whatever flush you’d like.

    If you have never had a hands-free toilet experience, you’ll likely be as delightfully surprised as we were. It’s one thing to ponder the possibility, but another to experience an odor and touchless toilet. I highly recommend this product.

  2. Bill Z

    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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Additional information

Weight 116 lbs
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Push Button Style

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Rough In

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Toilet used

Seat used

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Flush Option(s)

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Warranty Details

Night Light

Heated Seat

Adjustable Nozzle Position

Adjustable Water Pressure

Adjustable Water Temp

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Sizes Offered


Energy Saving

Water Heating System

Auto Opening

Sittable Lid

Sterilization System


User Presets

Special Spray Options

Auto Wash

Nozzle Oscillation

Pulse Wash

Rear and Front Washes

Seat Sensor

Self Cleaning Nozzles

Nozzle Material

Air Dryer

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Electrical Requirements


Soft Closing Lid & Seat

Shipping Details


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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.

They were proactive in following up after delivery in case we had any questions or problems.

All at very competitive prices!

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.
I am very happy that I found Many Bidets and if there are any bidet purchases in my future, they will be the first company I contact.

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If you are looking for honest reviews, got to their YOUTUBE page where the boss talks honestly about the actual functions, features, and perks of their top Bidets. Thats how I made my choice.
Dealing with them was not only easy but a pleasure. My bidet showed up days after I ordered it. The online install video was SUPER helpful, and last but not least they helped me online in the chat when I was narrowing down my choices.
It might seem like I'm gushing, but after walking into a few grocery stores where people just shrug and tell me they don't know where the ICE is... this was Customer Service:Advanced Edition and my experience couldn't have been any better!

Profile Picture Randale Watson

Because you were very easy to talk
with, knew your products and
ordering was very easy. Because I purchased from them before and it
was a very satisfactory experience!
Joanne H

It was very easy to order, and the bidet arrived quickly. They had the best price for the bidet we wanted.
Nicole D

Staff is extremely helpful and friendly. They were quick to answer my questions, deliver a quality product and even personally follow-up up after delivery to ensure everything was up to our satisfaction.
I would highly recommend this company to anyone!

Profile Picture Amber Hebblethwaite

Many Bidets says it's a family owned business; and believe me it treats you as if you're part of that family too. I recently made a purchase and I was immediately impressed by the service. Dan, the owner, was very friendly and professional, responding to all my concerns. He understood that, like other customers, I wanted the best quality product that fit my budget and to be happy and confident about my purchase. Believe me I got all of that and more. Delivery was super fast, the product was as described, the price was also reduced beyond the advertised discount. Dan followed up to make sure I was 100% happy with my purchase.
Recently, I had a question involving the manufacturer of a product I had purchased, nothing to do with excellent service at Many Bidets. Instead of merely referring me to the manufacturer, Dan stepped in when he didn't have, to make sure everything worked out to my satisfaction. That's the kind of customer service that Many Bidets provided. I would highly recommend dealing with Dan and Many Bidets if you value excellent all-round service, quality product at a great price, and peace of mind.

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Fantastic experience dealing with this company. Great price, fantastic response to questions, and delivery was actually ahead of schedule of when they said it should arrive. Delivery was professionally handled and well communicated.
I am a sticker for detail and had a fair amount of questions during the purchase. Each communication was dealt with promptly.
I would use this company again if possible in the future.

Profile Picture Paul Szymanski

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!

Profile Picture Romina Perez

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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