TOTO WASHLET+ Aquia IV Arc review

?Are you thinking about upgrading your bathroom with a high-tech toilet that blends comfort, cleanliness, and modern design?

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Product overview

You’re looking at the TOTO® WASHLET®+ Aquia IV® Arc Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with Auto Flush S7 Contemporary Bidet Seat, Cotton White – MW4484726CEMFGNA#01, a premium combination of toilet and bidet seat designed to integrate the WASHLET functionality without visible cords or hoses. This setup pairs an Aquia IV Arc two-piece elongated toilet with the S7 Contemporary bidet seat and includes features like automatic flushing, EWATER+ misting, adjustable warm water wash settings, heated seat, and a warm air dryer. If you value hygiene, convenience, and a modern look, this product aims to deliver all three.

What the package includes

You can expect the full toilet bowl, tank, S7 WASHLET+ bidet seat, and hardware required for installation. The WASHLET+ seat is specifically designed to conceal the water supply and power cord for a cleaner visual installation. Manuals and basic installation guides should be included, but you may want to keep your plumber or handy tools ready if you prefer professional installation.

Key selling points at a glance

You’ll get hands-free automatic flushing, EWATER+ sanitizing mist, front and rear warm-water washing with multiple temperature and pressure settings, an oscillating/pulsing stream option, a heated seat, automatic air deodorizer, and a warm air dryer with adjustable temperatures. The toilet uses a dual-flush system — 1.28 gallons per flush for a full flush and 0.9 gallons for a reduced flush — which helps balance performance and water savings.

Quick specification breakdown

This table breaks down the crucial specs so you can quickly compare features and decide if they fit your needs.

Feature	Details
Product name	TOTO® WASHLET®+ Aquia IV® Arc Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with Auto Flush S7 Contemporary Bidet Seat, Cotton White – MW4484726CEMFGNA#01
Toilet type	Two-piece, elongated bowl
Flush options	Dual flush: 1.28 GPF (full), 0.9 GPF (reduced)
Bidet seat model	S7 Contemporary (WASHLET+)
Automatic flush	Hands-free auto flush
Water washing	Front and rear warm water washing, 5 adjustable temperature and pressure settings
Spray options	Oscillating and pulsing stream options
Seat features	Heated seat with multiple temperature settings
Drying	Warm air dryer with 5 adjustable temperatures
Deodorizer	Automatic air deodorizer
Cleaning tech	EWATER+ misting for wand and bowl
Power	Requires power (designed to conceal cord)
Finish/color	Cotton White
Installation	Concealed supply and power integration for cleaner look

Installation and setup

You’ll want to plan the installation before the package arrives, because the WASHLET+ seat is designed to conceal the water supply and power cord and that impacts placement and hookup. The good news is that the integrated look is worth a small amount of extra planning to route power and water discreetly.

What you need before you start

You should have a nearby grounded outlet or plan for a qualified electrician to add one if it’s not present. You’ll also need basic plumbing tools and materials if you’re doing it yourself: adjustable wrench, screwdriver, plumber’s tape, and possibly a new toilet flange or wax ring depending on your current setup. If you’re replacing an existing toilet with similar rough-in dimensions, the swap is much simpler.

Step-by-step summary of the installation process

You’ll typically remove the old toilet, check or replace the flange/wax ring as needed, bolt down the new bowl, install the tank, then attach the WASHLET+ seat. For the WASHLET+, you’ll connect the concealed water supply and plug in the power — routing these cleanly behind the tank or within a nearby access panel for the hidden aesthetic. If you prefer not to DIY, hiring a plumber will ensure the concealed routing is done correctly and neatly.

How it performs in daily use

You’ll notice the first time you sit that the heated seat and gentle wash functions elevate everyday comfort. The S7 seat’s intuitive functions make it easy to personalize the experience, and the EWATER+ feature reduces harsh chemical use for cleaning, which you’ll appreciate if you want easier maintenance.

Flushing and water efficiency

You’ll appreciate the dual-flush capability: use 0.9 GPF for liquid waste and 1.28 GPF for solids. That combination helps reduce water usage compared with older toilets while still providing reliable flushing power. In many households, the 0.9 GPF flush is ample for routine use and contributes to lower water bills.

Bidet washing performance

You’ll find both front and rear wash modes useful. The S7 gives you five adjustable temperature and pressure settings, so you can fine-tune comfort based on season or personal preference. Oscillating and pulsing modes improve cleaning coverage and feel; oscillation gently sweeps the stream, while pulsing alternates pressure for a massaging effect. Overall, the wash performance is noticeably more thorough and comfortable than standard rinse-only bidets.

Comfort features that matter

When you use the heated seat, warm water washing, and warm air dryer together, you’ll feel like you’re in a luxury setting rather than a traditional bathroom. The automatic air deodorizer is especially handy if you want to maintain a fresher-smelling space without having to spray or mask odors. The dry function reduces or eliminates the need for toilet paper in many cases, which many users find both comfortable and eco-friendly.

Hygiene and cleaning technology

You’ll want a toilet that feels clean between deep cleans, and the EWATER+ technology is designed to help with that by misting the wand and bowl. That mist contains electrically charged water (hypochlorous-like effect) to inhibit bacteria and reduce mineral and soil buildup, helping you rely less on aggressive cleaners.

What EWATER+ does for you

You’ll see the wand and bowl misted after use and sometimes during cleaning cycles to minimize residue. This helps decrease odors and bacteria on surfaces, so you won’t need as many harsh chemical cleaners. It’s not a substitute for periodic manual cleaning, but it reduces frequency and workload.

Regular maintenance you’ll perform

You’ll still clean the bowl, wand, and seat periodically. The wand is self-cleaning between uses, but you should inspect the nozzle for build-up now and then. Use TOTO-recommended cleaners or mild, non-abrasive products to protect the finish and electronics. Replace any filters or batteries according to the manual if applicable, and keep the power connection dry and secure.

Controls and usability

You’ll interact with the S7 seat through intuitive controls that are user-friendly even if you’ve never used a bidet seat before. The S7 typically includes a remote or side panel with clear icons and presets for common functions.

How the controls feel in everyday life

You’ll likely program a favorite water temperature and spray intensity and then use quick-access buttons for front or rear wash. The remote often includes a stop button that immediately halts any function, which gives you quick control if anything feels off. For families, multiple users can adjust settings easily without reprogramming.

Accessibility and hands-free features

You’ll enjoy the hands-free automatic flush, which is particularly helpful if your mobility or range of motion is limited, or if you prefer a more sanitary interaction. Automatic features reduce the need to touch surfaces and create a cleaner experience overall.

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Noise, power, and energy use

You’ll notice some sound from the seat when it operates — primarily from the pump that draws warm water and the dryer when active. These sounds are generally low and not disruptive, but they are present, so you shouldn’t expect complete silence. The seat requires power for heating, the dryer, EWATER+, and automatic functions, so you’ll want to locate it near a properly grounded outlet or plan for wiring.

Power considerations

You’ll want to place the unit near an outlet or have a certified electrician install one if necessary. The energy usage of models like the S7 is higher than a non-electric seat due to heating elements and the dryer, but it remains modest compared to most household appliances. Many users find the comfort benefits worth the small additional energy cost.

Design and aesthetics

You’ll find the Aquia IV Arc’s sleek lines and Cotton White finish blend well into contemporary and transitional bathrooms. The elongated bowl shape adds comfort and a slightly more generous seating area compared to round bowls. The concealed WASHLET+ integration keeps your tank area tidy, which helps the whole installation read as one cohesive piece rather than two separate components.

Fit and finish in your bathroom

You’ll appreciate the modern minimal look. The concealed cord and water supply are a subtle but impactful design choice that reduces clutter and gives a more premium look. If your bathroom has a contemporary or spa-like design, this unit will likely fit in seamlessly.

Pros and cons

You’ll find a mix of advantages and tradeoffs. Laying these out helps you weigh whether the product fits your priorities.

Pros

• Hands-free automatic flush reduces touching and adds convenience.
• Dual-flush system (1.28 and 0.9 GPF) balances performance and water savings.
• EWATER+ reduces cleaning needs and helps maintain hygiene.
• Front and rear warm water washing with multiple temperature/pressure settings improves comfort and cleanliness.
• Heated seat, warm air dryer, and automatic deodorizer increase comfort and reduce toilet paper use.
• Concealed water and power connections for a cleaner look.
• Oscillating and pulsing spray options for enhanced wash experience.

Cons

• Requires a nearby grounded outlet or electrical work to add one.
• Higher purchase cost compared to standard toilets; installation may be more expensive if you hire a professional.
• Electronic components mean occasional troubleshooting or professional service may be needed.
• Warm air dryer and heated seat increase electricity usage compared to non-electric toilets, though the increase is modest.
• If your bathroom layout limits access to conceal power/water, you may need additional cabinetry or routing work to maintain the intended aesthetic.

How this compares to other options

You’ll find TOTO’s WASHLET-equipped toilets sit near the top in terms of features, build quality, and hygiene technology compared to many competitors. Other brands may offer similar functions but often either lack the same reputation for long-term reliability or don’t combine EWATER+ and a concealed WASHLET+ integration in a single packaged set.

Compared to basic bidet seats and non-electric options

You’ll see substantial comfort and hygiene improvements over non-electric bidet attachments that only provide water pressure. Basic units might be cheaper and easier to install, but they won’t offer heated water, warm air drying, or automatic flushing. If budget is a constraint, a simpler seat might serve you, but you’ll miss most of the premium conveniences.

Compared to other high-end seats or integrated toilets

You’ll find this product ranks well when considering the combination of toilet and S7 seat. Some integrated one-piece models provide similar features with a slightly different aesthetic. If you prefer a one-piece toilet for easier cleaning or a different silhouette, check TOTO’s other lines or similar high-end competitors. The key difference is how well you value the concealed WASHLET+ integration and EWATER+ features.

Who this is best for

You’ll be most satisfied with this product if you value hygiene, comfort, and a modern look and are willing to invest in a premium bathroom fixture. It’s ideal for households that appreciate tech-forward conveniences: families, couples, seniors wanting accessibility benefits, and anyone who prefers less frequent chemical cleaning.

Consider this purchase if:

• You want hands-free features and integrated hygiene tech.
• You’re updating a master bathroom or a frequently used bathroom.
• You want reduced toilet paper usage and easier cleaning.
• You’re comfortable with a slightly higher price for long-term convenience.

Troubleshooting and practical tips

You’ll likely encounter only a few common issues if the unit is installed properly. Being prepared for basic troubleshooting helps you get the best experience without frustration.

Common issues and fixes

• Power not working: Check the plug and outlet first, then the circuit breaker. If wiring was done behind a wall, ensure a qualified electrician confirms the connection.
• Weak or inconsistent spray pressure: Check that water supply valves are fully open. If the filter screens are clogged, clean them per the manual.
• Auto flush not activating: Confirm sensors are unobstructed and that the seat is installed correctly. Some settings allow you to adjust sensor sensitivity.
• Dryer not warming: Verify that the dryer setting is enabled and that the unit has power. If dryer still fails, contact support or a plumber experienced with electronic bidet seats.
• Persistent odors: Ensure deodorizer setting is on; manually clean the bowl and wand per maintenance guidelines. EWATER+ reduces buildup but won’t replace all cleaning tasks.

Routine tips to keep it working well

• Use mild, non-abrasive cleaners recommended by TOTO to preserve surfaces and electronics.
• Periodically inspect the wand for mineral buildup and clean if necessary.
• Keep the manual handy for reset procedures and parts identification.
• If you remove the seat for any reason, keep screws and brackets secure and follow the reinstallation sequence.

Cost considerations and value

You’ll pay more upfront compared to a standard toilet, but you should weigh that against long-term benefits: water savings from dual flush, lower cleaning costs thanks to EWATER+, reduced toilet paper usage from the dryer, and greater comfort. If you plan to stay in your home long-term, the added comfort and reduced maintenance often justify the investment.

Ongoing costs to consider

You’ll incur small increases in electricity usage due to heated water, seat heating, and the dryer. Replacement parts or service for electronic components can add cost down the road, but reputable brands like TOTO typically offer support and parts that help extend the lifespan.

Warranty and support

You’ll want to check the current warranty specifics when you purchase, because coverage can vary by region and seller. TOTO generally provides warranties on fixtures and electronic components, and authorized dealers or installers can help with warranty claims. Keep your receipt and serial numbers handy to streamline support if you need it.

How to get help if something goes wrong

You’ll typically contact the retailer first for return policy questions, then TOTO support for product-specific issues. If you choose professional installation, many plumbers offer a workmanship guarantee that complements the manufacturer’s warranty.

Final recommendation

If you want a premium, feature-rich toilet and bidet seat combo that prioritizes hygiene, comfort, and a clean aesthetic, you’ll likely be very pleased with the TOTO® WASHLET®+ Aquia IV® Arc Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with Auto Flush S7 Contemporary Bidet Seat, Cotton White – MW4484726CEMFGNA#01. The combination of EWATER+, hands-free auto flush, adjustable wash options, and concealed integration makes it a strong option for modern bathrooms where both form and function matter. Before you commit, confirm electrical access and rough-in compatibility for a smooth installation and long-term satisfaction.

Frequently asked questions (FAQ)

You’ll probably have a few remaining practical questions — here are quick answers to the most common ones.

Will this fit in my bathroom?

You’ll want to check your toilet rough-in measurement (distance from wall to center of flange). If your space has a standard rough-in and the elongated bowl fits your layout, you should be fine. If you have a compact space, measure carefully and consider whether an elongated bowl suits your bathroom.

Can I install it myself?

You’ll be able to install it yourself if you’re comfortable with basic plumbing and have a nearby grounded outlet. If you’re unsure about routing concealed power or water supplies, hiring a professional is a safe option.

How much water will I save?

You’ll save water compared to older toilets, especially those that use higher GPF. The dual flush options (0.9 and 1.28 GPF) reduce average water usage per flush, translating to lower bills and better resource use over time.

Is EWATER+ safe and effective?

You’ll find EWATER+ is designed to reduce bacteria and buildup, making cleaning easier and cutting down on harsh chemicals. It’s an added hygiene measure, but regular cleaning is still recommended.

What if something breaks?

You’ll rely on TOTO support and your warranty for defective components. Keep documentation and purchase records for warranty claims, and consider using authorized service providers if repairs require electronics expertise.

If you want, you can tell which features matter most to you — I can help you weigh those against typical bathroom layouts, budgets, and installation scenarios so you can decide whether this model is the right fit.

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