TOTO WASHLET+ Aquia IV review

Are you considering a premium toilet and bidet combo that aims to upgrade comfort, cleanliness, and water savings in your bathroom?

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Product overview

You’re looking at the TOTO® WASHLET®+ Aquia IV® Cube Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with S7A Contemporary Bidet Seat, Cotton White – MW4364736CEMFGN#01. This is a combined package that pairs a two-piece Aquia IV Cube elongated toilet with a WASHLET+ style bidet seat (S7A Contemporary), bringing TOTO’s hygiene tech and water-saving features into one coordinated product. The idea is to give you an integrated appearance and improved cleaning performance compared with a conventional toilet.

What’s included

You’ll receive the two-piece elongated ceramic toilet (Aquia IV Cube) and the S7A Contemporary bidet seat in Cotton White. The package is built so the toilet and WASHLET seat work together visually and functionally; components include the bowl, tank, seat assembly, mounting hardware, and the necessary connections for water and power to the bidet seat.

Key features at a glance

You’ll appreciate several TOTO-specific technologies built into this model: a WASHLET+ bidet seat design, concealed water supply and power cord for cleaner aesthetics, EWATER+ misting for wand and bowl, and PREMIST bowl wetting ahead of use. The toilet is a dual-flush model (1.28 and 0.9 GPF), which helps you save water on lighter flushes, and the seat offers front and rear warm water washing with five adjustable temperature and pressure settings.

Specifications table

Below is a table that breaks down the main specs and features so you can quickly compare details and understand what you’re getting.

Item	Specification / Notes
Product name	TOTO® WASHLET®+ Aquia IV® Cube Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with S7A Contemporary Bidet Seat, Cotton White – MW4364736CEMFGN#01
Toilet type	Two-piece elongated
Flush options	Dual flush: 1.28 GPF (full), 0.9 GPF (partial)
Bidet seat model	S7A Contemporary (WASHLET+ compatible)
Colors	Cotton White
Cleaning technologies	PREMIST (pre-wets bowl), EWATER+ (wand and bowl misting)
Washing functions	Front and rear warm water washing
Adjustability	Five temperature and pressure settings
Seamless integration	Conceals WASHLET water supply and power cord
Mounting	Standard elongated two-piece installation
Typical power needs	Requires an electrical outlet for WASHLET seat (GFCI recommended)
Ideal use	Residential bathrooms seeking hygiene and water efficiency

You’ll find this table useful when comparing the product to other options or when checking whether the listed features match your needs.

Design and aesthetics

The Aquia IV Cube styling aims to be contemporary and geometric, and the Cotton White finish keeps things crisp and neutral. You’ll notice the concealed connections for the WASHLET, which reduce visible cords and hoses and let the toilet look cleaner and more integrated.

How the finish and shape fit in different bathrooms

You’ll see that the elongated bowl shape favors comfort and a modern look, and Cotton White complements most color schemes, from very modern minimalism to softer transitional bathrooms. The two-piece configuration also makes transport and handling easier if you’re doing a DIY installation or working within tight spaces.

Integration of WASHLET and tank design

The package is designed so the bidet seat integrates neatly with the toilet’s lines, and the concealed water supply and power routing improves the visual flow. You’ll appreciate that this reduces clutter around the bowl and keeps the ergonomic design uninterrupted by cords or exposed tubing.

Hygiene and cleaning technologies

TOTO brings its PREMIST and EWATER+ technologies to this model so you’ll spend less time scrubbing with harsh chemicals. PREMIST wets the bowl before use to help waste slide off the surface more easily, and EWATER+ mists the wand and bowl after use, which inhibits residue buildup and makes routine cleaning simpler.

PREMIST explained and benefits

When PREMIST activates, a light mist wets the bowl surface before each use so that solids are less likely to cling to the ceramic. You’ll find this reduces the frequency and intensity of manual scrubbing, and it pairs nicely with the dual-flush design to keep flushes efficient.

EWATER+ explained and benefits

EWATER+ electrolyzes water to create a mild sanitizing mist that is applied to the wand and bowl surfaces, helping to reduce bacteria buildup and stains. You’ll notice a fresher bowl and wand with less reliance on harsh chemical cleaners, making maintenance both easier and more eco-friendly.

Bidet performance and user controls

The S7A Contemporary bidet seat included with this package provides both front and rear warm water washing and five adjustable settings for water temperature and pressure. You’re getting adaptable cleaning tailored to your comfort and preferences, which often results in a more comfortable post-toilet experience.

Water temperature and pressure customization

You’ll have five distinct levels to adjust both warmth and pressure so you can tune the spray to what feels best for you. Whether you prefer a gentler cleanse or a firmer stream for thorough cleaning, these settings let you personalize each use.

Wand performance and range

The wand is designed to provide effective directional spray for both front and rear cleansing, and TOTO’s misting features keep it cleaner between uses. You’ll appreciate that wand cleanliness and consistent spray give you reliable results every time you use the seat.

Comfort features

You’ll find the elongated bowl offers a more comfortable seating area for most users, and the heated seat function is typically a welcome feature in cooler climates. Although specific extra features like air dryers aren’t detailed in the supplied product notes, the core warm-water washing and adjustable controls provide noticeable comfort improvements over a standard toilet.

Heated seat and ergonomics

The heated seat makes cold mornings much more pleasant, and the contemporary seat shape is designed with ergonomics in mind. You’ll sit more comfortably for short or extended periods, which is helpful if your bathroom routine includes reading, bottle-feeding, or preparing for the day.

Noise and privacy

You’ll encounter some operational noise from water fill and the bidet functions, as with any electronic seat, but it’s typically low enough for normal home environments. If you’re especially noise-sensitive, consider locating the bathroom away from frequent sleeping areas or judge noise tolerance during showroom demos where available.

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Water efficiency and operating cost

The dual-flush system gives you two options: a 1.28 GPF full flush and a 0.9 GPF partial flush for liquid waste. You’ll reduce your household water usage compared to older toilets that use 3.5 or more gallons per flush, translating into lower utility bills over time.

Expected water savings and environmental impact

You can estimate significant water savings per flush cycle versus older, less efficient toilets. If you replace a conventional 3.5 GPF toilet and average multiple flushes per day, switching to 1.28/0.9 GPF options can cut a substantial percentage of your toilet-related water consumption, helping both your wallet and local water conservation efforts.

Cost considerations over time

You’ll pay more upfront for this high-tech integrated system than for a basic toilet, but you’ll likely recoup some costs through reduced water bills and lower cleaning product use thanks to PREMIST and EWATER+. Consider your local water rates and household usage patterns to estimate a break-even horizon for the higher initial investment.

Installation and setup

You’ll need a standard toilet rough-in and an electrical outlet nearby for the S7A bidet seat, since the WASHLET requires power. In most cases, you can install the two-piece toilet as you would any other, but the WASHLET seat will also require a secure electrical connection and a water supply attachment that’s either concealed or routed per the included hardware.

Electrical and plumbing requirements

You’ll want a GFCI-protected outlet within reach of the power cord for safety; many installers mount the outlet behind the tank or in an adjacent cabinet. For water, the bidet seat connects to the cold-water supply—TOTO’s concealed routing may require following specific installation steps to keep the lines hidden.

DIY vs. professional installation

If you’re comfortable with basic plumbing and have an outlet in the right place, you may handle the installation yourself, but many people prefer using a licensed plumber and an electrician to ensure a clean, safe hookup. You’ll get peace of mind and a more polished finish when a pro conceals the supply and power effectively.

Maintenance and long-term care

You’ll appreciate that PREMIST and EWATER+ reduce soiling and bacterial buildup, which cuts down the intensity and frequency of manual cleaning. Regular maintenance should still include routine bowl cleaning, periodic inspection of the wand and nozzle, and checking seals for leaks.

Routine cleaning tips

You’ll want to use non-abrasive cleaners on the ceramic bowl and avoid harsh chemicals directly on the EWATER+ treated areas to preserve the finish and the effectiveness of electrolyzed water. Clean the wand as recommended by the manual—often there’s a nozzle-clean or wand-clean cycle—and wipe the seat with a soft, damp cloth to preserve electronics.

Troubleshooting common issues

You might encounter occasional clogs, spray misalignment, or power issues; these are typically manageable by checking water connections, flush valve operation, and ensuring the outlet is active. If cleaning cycles don’t resolve problems, contact TOTO support or your installer for diagnostics so you don’t risk damaging electronic components.

Pros and cons

You’ll want to weigh benefits against trade-offs before purchasing. Below are the main advantages and potential drawbacks to help guide your decision.

Pros

• Excellent hygiene features with PREMIST and EWATER+ that reduce chemical use and cleaning frequency.
• Strong water efficiency from a dual-flush system (1.28 and 0.9 GPF), which helps lower your water bills.
• Integrated design with concealed water and power connections for a cleaner, modern look.
• Customizable warm water washing with five adjustable temperature and pressure settings for comfort.
• Elongated bowl for added seating comfort and better ergonomics.

Cons

• Higher upfront cost compared with a basic toilet; you’re paying for integrated hygiene and electronics.
• Requires a nearby GFCI outlet and possibly professional help to conceal power and water lines properly.
• Electronic components increase the potential need for repairs over a very long lifetime compared with a purely mechanical toilet.
• If you prefer a minimal tech approach, the features may be more advanced than you want or need.

Who should buy this

You should consider this product if you value cleaner, hands-free hygiene and want to reduce chemical cleaning and water usage. It’s especially fitting if you’re renovating a main or master bathroom and you want a modern aesthetic paired with practical cleaning technology.

When it might not be the best fit

You might not choose this model if you’re renovating on a tight budget or you lack the electrical infrastructure without additional work. Also, if you prefer a simpler, low-tech setup, the advanced WASHLET features might feel unnecessary.

Comparison with alternatives

If you’re comparing this integrated WASHLET+ package to separate toilet and aftermarket bidet seats or to other brands, the main differences are integration, concealed lines, and TOTO’s proprietary cleaning tech. You’ll often find aftermarket seats that provide some features but not always PREMIST or EWATER+, and those separate setups might leave visible cords or hoses.

Integrated vs. aftermarket seat

You’ll get a cleaner look and possibly easier integration when the seat and bowl are designed to work together, as in this TOTO package. Aftermarket seats can be cheaper and flexible but may not match perfectly in style and will frequently leave visible power cords.

TOTO vs. other brands

You’ll notice TOTO emphasizes cleaning technologies and quiet operation, and their engineering prioritizes reliability and water efficiency. Other brands may offer stronger emphasis on air drying or different nozzle motions, so choose based on which features matter most to your usage patterns.

Price and value considerations

You’ll pay a premium for the combined toilet and advanced bidet seat when compared to basic toilets. To evaluate value, balance the initial price against long-term water savings, reduced cleaning supplies, and the convenience of comfort features.

Long-term value

Over time you’ll likely save money on water bills thanks to the dual-flush system and on cleaning supplies thanks to PREMIST and EWATER+. If you plan to live in your home for several years, these savings combined with added comfort can justify the higher purchase price.

Resale and bathroom upgrades

If you plan to sell your home, this kind of high-end fixture can be a selling point for buyers who value modern amenities and hygiene. You’ll add perceived value to a renovated bathroom, which can help recoup a portion of the cost.

Troubleshooting and FAQs

You’ll likely have practical questions about power, cleaning cycles, or what to do if the seat doesn’t heat or the spray is weak. Below are common questions with straightforward guidance.

My WASHLET seat has no power. What should I check?

You’ll want to first check that the GFCI outlet is not tripped and that the cord is securely connected. If the outlet is live and the seat still won’t power on, check the seat fuse or consult TOTO customer service or your installer for further diagnostics.

How often do I need to clean the wand and nozzle?

You should clean the wand according to the manual’s schedule, which usually recommends a periodic manual clean and using the self-cleaning nozzle function regularly. You’ll keep the EWATER+ feature active and wipe surrounding areas weekly for best results.

Can I install this if my bathroom doesn’t currently have an outlet?

You can, but you’ll likely need an electrician to add a GFCI-protected outlet in an appropriate location. You’ll want the outlet to be positioned so the cord can be discreetly routed or behind the tank to maintain the integrated appearance.

Will PREMIST and EWATER+ eliminate the need for toilet cleaners entirely?

You should not expect to eliminate cleaning entirely; rather, these features reduce how often and how aggressively you must clean. You’ll still perform periodic cleaning for hygiene and aesthetics, but with less reliance on harsh chemical cleaners.

Accessories, parts, and warranty

You’ll be able to purchase replacement parts like nozzles, gaskets, and mounting hardware from TOTO or authorized dealers. Check the product warranty details when you buy—TOTO typically offers support and parts availability, but warranty length and coverage vary by region and dealer.

Replacement components and service

You’ll find that common replacement items are available through TOTO dealers, and many installers can handle repairs. For electronics or persistent issues, contacting TOTO’s support will get you manufacturer-level troubleshooting and recommended service options.

Warranty considerations

You’ll want to confirm warranty length for both the ceramic toilet and the electronic bidet seat at the point of purchase. Keep proof of purchase and registration information handy so you can expedite any warranty claims if needed.

Final verdict

You’ll find the TOTO® WASHLET®+ Aquia IV® Cube Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with S7A Contemporary Bidet Seat, Cotton White – MW4364736CEMFGN#01 is a strong option if you want high hygiene performance, modern aesthetics, and meaningful water savings. If you’re willing to invest in the higher initial cost and ensure proper electrical and plumbing setup, this package gives you convenience, comfort, and reduced cleaning burden over time.

Quick recommendation

If you prioritize hygiene tech, comfort customization, and a neat integrated appearance, you’ll likely be very satisfied with this combination. If your primary focus is minimal upfront cost or extremely low-tech simplicity, you might prefer a basic toilet or a lower-cost bidet seat instead.

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