TOTO WASHLET+ Aquia IV Arc Toilet review

? Are you looking for a high-tech toilet that cleans, conceals, and flushes automatically while feeling like a peaceful upgrade to your bathroom?

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Overview of the TOTO® WASHLET®+ Aquia IV® Arc Two-Piece Toilet with S7A Bidet Seat

You’ll find that this model combines TOTO’s intelligent bidet technology with a contemporary two-piece elongated toilet. The product pairs a WASHLET+ bidet seat design with an Aquia IV Arc toilet, aiming to give you both hygiene and style in one package. It ships in Cotton White and is targeted at homeowners who want a hands-free, low-water-consumption option.

What the product includes and why that matters

You get the toilet bowl and tank designed for WASHLET+ integration plus the S7A Contemporary Bidet Seat. This combination keeps the electronics and water connections neat, reducing visible clutter and giving your bathroom a cleaner look. You’ll appreciate the concealed water supply and power cord, which helps preserve a minimalist aesthetic.

Key features at a glance

You’ll want to know the big selling points quickly, so here they are in plain language. The unit offers dual flush options (1.28 GPF and 0.9 GPF), Auto Flush, EWATER+ and PREMIST technologies, and a WASHLET+ seat experience designed for comfort and hygiene.

Why the dual flush matters to you

Dual flush lets you choose between a full 1.28 gallons per flush for solid waste and a reduced 0.9 gallons per flush for liquid waste. That choice gives you better water savings without sacrificing performance. If you’re focused on reducing utility bills or environmental impact, this feature is one of the main reasons to consider this model.

Detailed specifications table

You’ll find the quick specs laid out in a table to make comparisons and purchasing decisions easier. This table shows the physical and functional highlights you’ll care about when measuring space and matching bathroom decor.

Specification	Detail
Product name	TOTO® WASHLET®+ Aquia IV® Arc Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with Auto Flush S7A Contemporary Bidet Seat, Cotton White – MW4484736CEMFGNA#01
Bowl shape	Elongated
Toilet style	Two-piece
Flush options	Dual flush: 1.28 GPF (full), 0.9 GPF (reduced)
Seat included	S7A Contemporary Bidet Seat (WASHLET+ family)
Auto Flush	Yes — hands-free automatic flush system
EWATER+	Yes — mists wand and bowl to reduce cleaning chemicals
PREMIST	Yes — wets bowl surface before use to aid cleaning
Installation orientation	Standard 12-inch rough-in (check local installation details)
Color	Cotton White
Power	Requires nearby GFCI outlet for seat functions
Concealed connections	Concealed water supply and power cord integration
Target user	Homeowners seeking comfort, hygiene, and water efficiency

Design and aesthetics

You’ll notice the Aquia IV Arc design aims for smooth lines and a modern profile. The elongated bowl adds to comfort, while the Cotton White finish fits many decor palettes. The concealed connections mean you won’t see a power cord hanging or a tangle of lines, which is particularly helpful when you want a tidy look.

How the WASHLET+ seat integrates visually

The WASHLET+ seat complements the toilet’s curves to create a unified appearance. Because the water supply and power cord are routed discreetly, you’ll likely find the installation looks like a factory-finished single unit. That integration matters if you’re renovating or replacing an older, bulkier toilet.

Comfort and usability

You’ll feel a difference with the elongated bowl and the S7A seat. The seat offers ergonomic shaping and adjustable wash functions, so you can tailor temperature, pressure, and spray pattern. If you have mobility concerns or prefer a cleaner, hands-free experience, the built-in bidet features reduce the need for toilet paper.

Seat controls and customization

The S7A (part of the WASHLET+ family) typically provides easy-to-access controls, often with presets or user memory functions on many WASHLET models. You’ll be able to set water temperature, nozzle position, spray intensity, and sometimes seat temperature. These adjustments ensure a comfortable, personalized experience for every use.

Hygiene technologies: PREMIST and EWATER+

TOTO packages proactive cleaning features so you don’t have to scrub as often. PREMIST wets the bowl surface before each use, which helps waste slide off more easily and reduces staining. EWATER+ mists the wand and the bowl after use with electrolyzed water, helping reduce bacteria and lessening the need for harsh chemicals.

Why these matter for maintenance

You’ll spend less time scrubbing because PREMIST reduces adhesion and EWATER+ helps keep the wand and bowl sanitized between manual cleans. For busy households, this can meaningfully reduce the effort and frequency of deep cleaning, and it’s a nice feature if you want a lower-chemical cleaning routine.

Auto Flush: how it works and what to expect

The hands-free Auto Flush activates after you stand up or when the sensor detects certain conditions, so you don’t need to press a lever. You’ll appreciate reduced contact with surfaces and a more hygienic experience. The system typically includes a manual override if you prefer to control flushes for specific situations.

Potential sensor behavior and tips

You should be aware that motion sensors can sometimes misread movements if installed in cramped spaces or if other objects are very close by. If you notice premature or missed flushes, you might need minor sensor adjustments or to relocate items around the toilet to avoid interference.

Water efficiency and environmental impact

You’ll get strong water savings from the dual flush system. Choosing 0.9 GPF for liquid flushes and 1.28 GPF for solids can reduce your household water consumption compared to older toilets using 1.6 GPF or more. This model is attractive if you’re water-conscious or live in an area with regulations or incentives for low-flow fixtures.

Comparing efficiency to standard toilets

Older standard toilets can use up to 3.5–7 gallons per flush in very old models, and modern non-dual flush low-flow toilets often use 1.28–1.6 GPF. You’ll find the 0.9 GPF option particularly notable — it’s lower than many low-flow toilets, so you’ll benefit from additional conservation over time.

Installation and setup

You’ll need basic plumbing and a nearby GFCI outlet for the power seat. Installation is straightforward for someone comfortable with bathroom fixtures, but you may prefer a licensed plumber for the water and electrical connections to ensure warranty adherence and code compliance.

Step-by-step highlights for setup

You’ll attach the tank to the bowl and secure the toilet to the floor using proper flange and bolts. Then you’ll mount the WASHLET+ seat and connect the concealed water supply and power cable as instructed. Final steps include running the seat through its initial setup sequence and calibrating any sensor or auto-flush features per the manual.

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What you’ll need before installation

Make sure you have a GFCI-protected outlet within reach of the seat’s cord, and verify your rough-in measurement (standard is often 12 inches, but confirm before buying). You’ll want the right tools, a good-quality flexible supply line for connection, and optionally plumber’s silicone or caulk for finishing the base.

Performance in everyday use

You’ll notice consistent flush power for both small and larger loads thanks to the dual flush. The WASHLET+ functions deliver comfortable cleaning that reduces toilet paper usage and improves personal hygiene. Most users find that the seat functions and water-pressure settings meet diverse needs, from light to robust cleaning.

Noise and running sound expectations

You’ll hear an audible flush and occasional pump noise when EWATER+ or internal cleaning cycles run, but these are generally not intrusive. The seat’s bidet spray is quieter than many handheld systems, and any fan or blow-dry function (if present) operates at a moderate level, designed for privacy and minimal disturbance.

Cleaning and maintenance

You’ll find maintenance is easier with PREMIST and EWATER+, but you still need routine cleaning. Wipe the exterior and seat regularly, and clean the bowl using non-abrasive cleaners. The wand is self-cleaning to an extent with EWATER+, but periodic manual cleaning as recommended by TOTO will extend its longevity.

Recommended maintenance schedule

You should wipe the toilet and seat weekly, inspect for leaks monthly, and follow the manufacturer’s instructions for more thorough checks every 3–6 months. Replace water filters or check valves if your model or local water conditions suggest buildup. Regularly inspect the electrical cord and connections for wear.

Durability and build quality

You’ll expect TOTO’s ceramic finish and durable plastics on the seat to last for years with normal household use. The concealed connections reduce exposure to accidental damage and make the seat/chassis less vulnerable than exposed wiring. TOTO generally has a strong reputation for long-lasting components and reliable flushing performance.

Warranty and after-sales support

You’ll want to check the exact warranty terms at purchase, but TOTO offers manufacturer support and often a limited warranty that covers defects in materials and workmanship. If you register your product or retain receipts, you’ll be better positioned for quick service if anything goes wrong.

Pros and cons summary

You’ll find a quick pro/con list useful for deciding whether this model fits your needs.

Pros:

• Hands-free Auto Flush for improved hygiene.
• PREMIST and EWATER+ reduce cleaning frequency and chemical use.
• Dual flush (1.28 / 0.9 GPF) offers strong water savings.
• Concealed water supply and power cord for a cleaner appearance.
• Comfortable elongated bowl and adjustable bidet features.

Cons:

• Requires a nearby GFCI outlet and potential electrician/plumber help.
• Higher upfront cost than standard toilets without bidet features.
• Motion sensors can sometimes require minor adjustment for ideal performance.
• Replacement parts (electronic seat) can be more expensive than standard seats.

Comparison to similar options

You’ll find competing smart toilets and retrofit bidet seats available, but few integrate dual-flush efficiency, EWATER+, and PREMIST together in a two-piece package. If you’re choosing between retrofitting an existing toilet with a WASHLET seat and buying this integrated package, consider the visual integration and concealed wiring benefits versus cost.

When a retrofit bidet might make more sense

You’ll save money if you already have a compatible toilet and only need the seat. A retrofit is less invasive and cheaper up front. But if you want a completely unified appearance, better concealed wiring, dual flush savings, and a fresh bowl design, the integrated two-piece set adds value.

Who should buy this product

You’ll want this if you value hygiene, minimal visible wiring, and water efficiency. It’s ideal for primary bathrooms, master suites, and anyone looking to upgrade to a cleaner, more modern bathroom experience. If you host guests often, the hands-free flush and easy-clean features are real selling points.

Who might want a different option

You’ll want to look elsewhere if you lack an outlet near the toilet, have a very tight budget, or need a one-piece compact toilet for a small bathroom. Also consider alternatives if you prefer a simple mechanical seat without electronics.

Troubleshooting common issues

If you experience missed flushes, check for sensor obstructions and clear the surrounding area. If the seat won’t power on, verify the GFCI outlet is functioning and that the power cable is correctly connected. For weak flushes, check the water supply valve beneath the tank and ensure it’s fully open.

When to call a professional

You should consider a plumber or electrician if you need to install an outlet, if you find persistent leaks, or if the auto-flush mechanism requires replacement. For electrical issues with the seat, contact TOTO support or a licensed technician to avoid voiding warranty terms.

Pricing and value

You’ll pay a premium over a basic toilet, but the value comes from water savings, reduced cleaning time, improved hygiene, and a cleaner look due to concealed connections. Over years of use, reduced water bills and lower cleaning-product expenses can offset the higher upfront cost.

Tips to maximize value

You’ll get the best value by pairing the toilet with efficient household water management, using the reduced flush option when appropriate, and staying current with simple maintenance to avoid costly repairs. Shop seasonal promotions or rebates for high-efficiency fixtures to reduce initial expense.

Installation tips and best practices

You’ll improve your setup success by measuring rough-in distances before ordering and confirming outlet placement. Use TOTO’s installation guide closely, secure the unit to a level flange, and do a final check for leaks and proper operation of the Auto Flush and bidet functions.

Small adjustments that make a big difference

You should confirm the seat is securely latched and that nozzle movement is unobstructed. Place nothing on top of the tank that might interfere with the auto-flush sensor. Also, test the different flush settings so you can set expectations for family members or guests.

Final verdict

You’ll get a thoughtfully engineered combination of modern bidet comfort, water efficiency, and cleaner aesthetics with the TOTO® WASHLET®+ Aquia IV® Arc Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with Auto Flush S7A Contemporary Bidet Seat, Cotton White – MW4484736CEMFGNA#01. If the price and outlet requirement fit your situation, this model is a strong choice for a long-term bathroom upgrade that focuses on hygiene and convenience.

Frequently asked questions (FAQ)

You’ll likely have some practical questions before buying—here are the ones most buyers ask.

Q: Does the product include the bidet seat?
A: Yes, it includes the S7A Contemporary Bidet Seat as part of the package, which is consistent with the WASHLET+ family.

Q: Do you need an electrician to install it?
A: If you don’t already have a GFCI outlet nearby, you should hire an electrician. If an outlet is present and you’re comfortable with basic plumbing, a skilled DIYer could handle installation, but a plumber is recommended for best results.

Q: Will PREMIST and EWATER+ eliminate all cleaning?
A: They’ll significantly reduce the need for harsh chemicals and scrubbing, but routine cleaning is still recommended.

Q: Can the auto flush be turned off?
A: Yes, most TOTO auto flush systems offer an option to disable or adjust the sensor sensitivity and timing so you can use manual flush if preferred.

Q: What if the toilet doesn’t fit my bathroom rough-in?
A: Confirm your rough-in measurement before purchase. If your rough-in is non-standard, look for compatible models or consult a plumber.

If you want, you can ask for a buyer’s checklist or a step-by-step installation checklist tailored to your bathroom layout.

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