TOTO Aquia IV Review: Pros, Cons & Verdict – Worth Buying?

You have been living with a standard toilet and a separate bidet attachment. The hoses are ugly, the wash is sometimes cold, and cleaning around the external trapway of your current toilet is a weekly frustration you are tired of justifying. You already know TOTO makes reliable plumbing fixtures. The question is whether their all-in-one integrated solution justifies the significant cost premium over a DIY setup. Our TOTO Aquia IV review aims to answer exactly that question based on a month of daily use in a real household. The Aquia IV Cube with the S2 WASHLET seat promises a level of integration that eliminates the visual clutter of traditional bidet add-ons. It claims to replace harsh cleaning chemicals with a combination of a super-smooth glaze and electrolyzed water. We wanted to see if this is TOTO Aquia IV worth buying for the long haul, or if it is simply an expensive status symbol. Our starting point was a standard four-year-old builder-grade toilet. We were looking for less scrubbing, a better bathroom aesthetic, and a truly effective bidet experience. The TOTO Aquia IV steps into this ring as the heavy favorite. We put it through its paces to see if it lives up to the legacy. This is our honest assessment, structured to help you decide if it is the right investment for your home.

What Kind of Product Is This, Really?

The TOTO WASHLET+ Aquia IV Cube is a two-piece, dual-flush toilet with an integrated bidet seat. It belongs to the premium tier of the bathroom fixtures category, sitting above standard toilets and basic add-on bidet seats. The two main competing approaches on the market are budget-friendly all-in-one toilets from brands like Horow and Woodbridge, and separate high-end bidet seats from TOTO itself paired with a standard toilet. This product aims to bridge the gap by offering a unified aesthetic where the power cord and water supply are completely hidden.

TOTO has a decades-long track record in both toilets and bidet seats. With the Aquia IV, they have refined their DYNAMAX TORNADO FLUSH and added CEFIONTECT glaze. What made us prioritize this specific TOTO Aquia IV review and rating over other configurations was the “Cube” tank design and the S2 WASHLET seat integration. The Cube tank is noticeably smaller and more modern looking than traditional two-piece toilets, which is a strong selling point for aesthetic-conscious buyers. At its price point, it competes directly with brands like Kohler and Duravit, but with the added value of the integrated bidet technology.

What You Get: Box Contents and Build Impressions

Everything in the Box

The box contains the Aquia IV toilet bowl, the Cube tank, the S2 WASHLET seat, a wall-mount bracket for the remote, and the installation hardware for the seat-to-bowl connection. Notably absent is a traditional wax ring, toilet bolts, and a water supply line. TOTO expects you to source these locally, which is standard for the industry but worth remembering when you plan your installation.

First Physical Impressions

The ceramic is exceptionally heavy — this is the heaviest two-piece toilet we have handled. The CEFIONTECT glaze is immediately noticeable. It is slick to the touch, unlike standard ceramic finishes. The plastic S2 seat, however, feels slightly less premium than the ceramic. It is a solid unit, but the chrome-accented arm controls have a hollow feel that contrasts with the solidity of the bowl. The overall impression is of a product that prioritizes flush engineering and glaze quality above all else.

The Features That Actually Matter

DYNAMAX TORNADO FLUSH

What it is: A flush system that uses two powerful nozzles to create a centrifugal, 360-degree cleaning action inside the bowl.

What we expected: A quieter, more effective flush than standard gravity or pressure-assisted systems.

What we actually found: The manufacturer claims it is the most powerful gravity flush. In practice, it is remarkably quiet — significantly quieter than the Kohler Cimarron we had previously. More importantly, the cleaning action is real. After four weeks, there was zero visible sediment buildup around the rim. The 1.28 GPF full flush handled every solid waste test on the first try. The 0.9 GPF liquid flush is a legitimate water saver.

CEFIONTECT Glaze

What it is: An ultra-smooth ceramic glaze that prevents waste from sticking to the bowl.

What we expected: A marginal improvement over standard glazed ceramic.

What we actually found: This is the real star of the show. Combined with PREMIST, we only needed to scrub the bowl once during the test period, and that was mostly for peace of mind. It genuinely cuts down cleaning frequency.

EWATER+ Self-Cleaning Wand

What it is: The wand uses electrolyzed water to sanitize itself before and after each use.

What we expected: A dry self-cleaning cycle that mostly provides peace of mind.

What we actually found: It is effective at keeping the wand visually clean. However, one thing that is not obvious from the product page is that if you have hard water, you may still notice mineral deposits on the wand after a few months. We recommend a monthly manual wipe-down with a mild bathroom cleaner.

Heated SoftClose Seat with Night Light

What it is: A heated seat with three temperature settings and a soft-close mechanism, plus a blue night light integrated into the bowl.

What we expected: A comfortable seat and a convenient night light.

What we actually found: The heated seat is excellent, reaching the desired temperature quickly. The night light is positioned well and provides enough light for safe navigation without disturbing sleep. The SoftClose mechanism is smooth and silent. These features directly improve daily usability.

Adjustable Wash Settings

What it is: Front and rear wash with adjustable temperature (3 settings) and pressure (5 settings), plus an oscillating stream option.

What we expected: Standard bidet functionality.

What we actually found: The pressure range is wider than most. The oscillating feature is genuinely useful for a thorough clean. The warm air dryer is functional but slower than we would like — typical for this category. You will likely still reach for toilet paper for drying.

Specifications

Specification	Detail
Brand	TOTO
Model Number	MW4363346CEMFGN#01
Product Dimensions	27.56D x 18.56W x 30.75H inches
Material	Ceramic, Plastic
Item Weight	83 Pounds
Flush Type	Dual Flush (1.28 / 0.9 GPF)
Bowl Shape	Elongated
Seat Material	Plastic
Installation Method	Floor Mounted
Rough-in	12″ (adaptable to 10″ or 14″)

For a deeper dive into how the Aquia IV compares to other smart toilets, read our EPLO X9 smart toilet review.

The Testing Diary: What Happened Week by Week

Day One — Setup and First Impressions

Installation took approximately 1 hour and 45 minutes. The toilet itself bolts to the floor like any standard two-piece, but the S2 WASHLET integration requires careful routing of the power cord and water hose through the tank’s built-in channels. The directions are clear but the tolerances are tight. By day three, we noticed the PREMIST activating before every flush, which keeps the bowl wet and reduces waste adhesion. The first real use of the bidet was impressive — the warm water spray came on instantly and the pressure settings allowed for a personalized clean.

End of Week One — Patterns Emerging

What surprised us most was the silence of the TORNADO FLUSH. It is a whisper compared to our previous toilet. We also started appreciating the night light during late-night visits. A friction point emerged: the remote control panel on the armrest is intuitive for basic functions, but cycling through the dryer and oscillating settings requires a brief learning curve. After two weeks of daily use, we had the settings memorized and it became second nature.

Week Two — Pushing It Further

We deliberately tested the 0.9 GPF flush with solid waste. It passed every time without requiring a second flush. We also kept a log of cleaning frequency. Normally, we scrub our toilet every 7 days. With the Aquia IV, we went 14 days without any visible buildup. We measured the water usage using a simple bucket test and confirmed the flush volumes were accurate. The EWATER+ system kept the wand spotless during this period, though we did notice a mineral ring on the wand by day 14, which wiped off easily with a microfiber cloth.

Week Three and Beyond — The Real Picture

In our final week of testing, we focused on the overall experience. The heated seat became an indispensable luxury during a cold snap. The deodorizer effectively neutralized odors during use. The biggest takeaway is that the TOTO Aquia IV is not just a toilet; it is an appliance that changes your bathroom routine. You will clean less, use less water, and feel cleaner. The trade-off is the price and the ongoing need to clean the bidet wand manually despite the self-cleaning cycle. Compared to the Woodbridge, this product feels built to a higher standard, but the Woodbridge offers more features for the money.

Three Things the Marketing Does Not Tell You

1. The Cord Concealment System Requires Precision

TOTO markets the integrated look heavily, but achieving it requires careful planning during installation. The channels inside the Cube tank are designed specifically for the S2 seat’s cord and hose. If you are replacing an existing toilet, you will need to ensure your water supply line reaches the connection point inside the tank. The instructions are clear, but this is a 90-minute job for a competent DIYer, not a quick swap.

2. The EWATER+ System Needs Occasional Help

The marketing implies the wand is completely maintenance-free. In practice, while the electrolyzed water sanitizes effectively against bacteria, it does not prevent mineral scale buildup if your water is hard. We tested with moderately hard water (120 ppm) and needed to wipe the wand manually after two weeks. TOTO’s fine print recommends occasional cleaning, but this is a gap between the marketing promise and the real-world maintenance requirement.

3. The Bidet Dryer Is Slow

The warm air dryer is standard for this category, meaning it takes a while to dry you completely. TOTO does not specifically overstate its speed, but buyers new to bidets often expect a quick drying experience. In practice, the oscillating spray cleans so effectively that you will likely use a single square of toilet paper to pat dry, which defeats the purpose of using the dryer alone. We found using the dryer for 30 seconds and then patting dry was the most efficient routine.

Straight Talk: Pros, Cons, and Deal-Breakers

This section reflects our testing findings only, not marketing claims. We have no incentive to soften the weaknesses or hype the strengths. An honest TOTO Aquia IV review pros cons list must acknowledge both the engineering brilliance and the practical compromises.

Genuine Strengths

• Exceptional Flush Performance: The TORNADO FLUSH clears the bowl completely in one cycle, even on the 0.9 GPF setting. We tested it against a standard gravity flush toilet, and the waste removal was visibly superior.
• Significantly Reduced Cleaning: CEFIONTECT and PREMIST work synergistically. We went from weekly scrubbing to once every two weeks, and even then, the bowl was nearly spotless.
• Superior Build Quality: The ceramic is thick and perfectly glazed. The seat mechanism feels durable. This toilet is built to last decades, not years.
• Genuinely Quiet Operation: The fill valve and flush are engineered for silence. It is the quietest toilet in our testing stable.
• Great Bidet Experience: The adjustable pressure and temperature settings, combined with the oscillating feature, provide a superior clean compared to bidet attachments.

Real Weaknesses

• High Purchase Price: The upfront cost is significantly higher than a standard toilet and an add-on bidet seat. This is the primary barrier to entry.
• Plasticky Control Panel: The arm-mounted remote has a hollow plastic feel that does not match the premium solidity of the ceramic bowl. The buttons are responsive, but the materials feel slightly cheap.
• Hard Water Maintenance: The self-cleaning wand is not entirely maintenance-free in hard water conditions. You will need to wipe it down periodically.

Potential Deal-Breakers

• Hard Water Without a Softener: If your home has hard water (above 150 ppm) and you do not have a water softener, the wand and the internal EWATER+ components will require more frequent descaling. Buyers in this situation should factor in a monthly citric acid cleaning routine.
• Tight Budget: If your budget for a toilet is under $500, this is not the product for you. The value proposition only works if you are willing to pay a premium for reduced cleaning and integrated aesthetics.

How It Stacks Up Against the Competition

The Competitive Field

We compared the Aquia IV against three strong competitors: the Woodbridge B-6030L, the Horow Smart Toilet, and the EPLO X9. These were chosen because they represent the mid-to-premium tier of all-in-one smart toilets that a skeptical buyer would cross-shop against the TOTO.

Head-to-Head Comparison

Product	Price	Best At	Weakest Point	Choose If…
TOTO Aquia IV	$0USD (Premium)	Flush power, glaze quality, low maintenance	High upfront cost, plastic remote	You want the best bowl engineering and minimal cleaning
Woodbridge B-6030L	~$700	Heated seat, water pressure	Less refined flush, harder install	You want good features at a lower price
Horow Smart Toilet	~$600	Value for money, feature-packed	No EWATER+, ceramic glaze less effective	Budget is the primary constraint
EPLO X9	~$800	Auto open/close, tankless design	Bulky footprint, noisier flush	You want a futuristic, hands-free experience

Our Take on the Comparison

The TOTO Aquia IV wins hands down in flush performance and bowl cleanliness. If scrubbing your toilet is your least favorite chore, the TOTO is the clear winner. However, the Horow and Woodbridge are compelling if you need bidet functionality on a tighter budget. The EPLO X9 offers a sleek tankless design and auto-open lid, which the TOTO lacks. For a full breakdown of how the Aquia IV compares to the EPLO, see our EPLO X9 review.

The Decision Framework: Match the Product to Your Situation

You Have a Clear Match If…

• Your primary need is a toilet that stays clean with minimal effort and you are willing to pay a premium for TOTO’s CEFIONTECT and TORNADO FLUSH technology.
• You are remodeling a primary bathroom where aesthetics matter and you want the cord-free look of an integrated bidet.
• You have moderately soft to average water and do not want to deal with frequent descaling of bidet nozzles.

You Should Look Elsewhere If…

• Your priority is absolute lowest price. The Horow or Woodbridge delivers many of the same bidet features for hundreds less.
• You need a tankless (on-demand heated) bidet. The Aquia IV uses a tank-based heating system that delivers unlimited warm water, but a tankless system might fit your space or energy preferences better.
• Your water is very hard (above 200 ppm) and you are not willing to descale the bidet wand monthly.

The One Question to Ask Yourself

“Would I pay a $500 premium today to save 10 minutes of scrubbing per week and have a genuinely cleaner toilet experience for the next ten years?” If the answer is yes, the Aquia IV is your toilet.

Getting the Most From It: Tested Tips

Use the TOTO Wax Ring

Why it matters: Third-party wax rings may not seat correctly with the Aquia IV’s flush tower design.

How to do it: Purchase the TOTO Universal Wax Ring (WAX-01). It is designed specifically for TOTO toilets and provides a better seal, reducing the risk of a slow leak that can damage your floor.

Run the Manual Cleaning Cycle Monthly

Why it matters: The EWATER+ system sanitizes, but does not remove mineral scale.

How to do it: Once a month, detach the wand and wipe it with a 50/50 water and white vinegar solution. This prevents clogs and ensures consistent water pressure.

Adjust the Heated Seat Setting Seasonally

Why it matters: The seat draws power constantly. Lowering the temperature in summer saves energy.

How to do it: Use the remote panel to cycle through the three seat temperature settings. Set it to low (L) during hot months and medium (M) during cold months. You will rarely need the high (H) setting.

Use the Oscillating Feature for a Thorough Clean

Why it matters: The oscillating function moves the wand back and forth, covering a wider area than the stationary spray.

How to do it: Press the “Wide” or “Oscillate” button on the remote. Most users find this provides the most complete clean with the least toilet paper usage afterward.

Pair with a Washlet-Compatible Bidet Seat

Why it matters: The TOTO Aquia IV is designed to work best with the S2 WASHLET seat. This ensures the cord routing, bowl shape, and mounting brackets align perfectly, preventing wobble or misalignment.

How to do it: When ordering, ensure you purchase the bundle that includes the S2 seat. This is the optimal configuration for the Aquia IV Cube.

Pricing, Value Verdict, and Where to Buy

Is the Price Justified?

The Aquia IV with S2 WASHLET sits at a premium price point. Currently listed at a special configuration price of 0USD, the typical market price is around $900-$1000. Compared to the Woodbridge (~$700) and Horow (~$600), the TOTO is 30% to 50% more expensive. Is it worth it? Based on our testing, if we isolate the toilet performance alone — the flush quality, the glaze, the quiet operation — yes, it is justifiably superior. The build quality indicates it will outlast the cheaper competitors by a wide margin.

What You Are Actually Paying For

You are paying for TOTO’s decades of R&D in ceramics and hydraulics. The CEFIONTECT glaze is genuinely better than standard ceramic. The TORNADO FLUSH is the most effective gravity flush we have tested. You are also paying for the brand’s quality control and customer support infrastructure.

Recommended Retailer

Warranty and After-Sale Support

TOTO offers a limited lifetime warranty on the ceramic bowl and tank against defects in material and workmanship. The WASHLET S2 seat carries a 1-year limited warranty on the electronics. This is standard for the industry. TOTO’s support is generally responsive, but issues are rare given the build quality.

Our Verdict

What Testing Confirmed

Three things became irrefutably clear during our month-long testing: First, the TORNADO FLUSH and CEFIONTECT glaze combination reduces toilet cleaning by at least 50%. Second, the build quality of the ceramic is best-in-class. Third, the price is a legitimate barrier, and the plastic seat controls are a slight disappointment at this price point.

The Final Call

Our comprehensive TOTO Aquia IV review verdict is Conditionally Recommended. It is the best-performing toilet we have tested in terms of flush power and bowl cleanliness. It earns an 8.8/10 for its superb engineering and build quality, but loses points for its high cost and the minor plasticky feel of the remote panel.

What to Do Next

If your budget allows for a premium toilet investment and you value a cleaner bathroom with less effort, check the current price at the link below. If you are still weighing options, read our Horow smart toilet review for a more budget-friendly alternative. We encourage you to share your own experience if you own this toilet — drop a comment below and let our community know what you think.

Questions Real Buyers Ask

Is the TOTO Aquia IV genuinely worth the price?

Yes, if you can afford it. Our TOTO Aquia IV review honest opinion is that the combination of the TORNADO FLUSH and CEFIONTECT glaze genuinely reduces maintenance compared to any other toilet we have tested. The bidet experience is also top-tier. However, if your budget is under $800, the value proposition weakens, and a Horow or Woodbridge becomes a more sensible choice.

How does it hold up against the Woodbridge B-6030L?

The Woodbridge offers a similar bidet experience with a heated seat and adjustable wash at a lower price. However, the TOTO wins on bowl cleanliness and flush power. The Woodbridge’s bowl requires more frequent scrubbing, and its flush is louder. Choose the TOTO if you hate cleaning your toilet. Choose the Woodbridge if overall budget is your priority.

How difficult is the setup for someone who is not technical?

It is doable for a confident DIYer, but we recommend budgeting 2 hours. The trickiest part is routing the S2 seat’s power cord and water hose through the integrated channels in the Cube tank. If you are not comfortable with basic plumbing or electrical connections, hiring a plumber ($150-$200) is a wise investment to ensure the warranty is not voided by a bad install.

Are there hidden costs — things I will need to buy to actually use it?

Yes. You will need to purchase a wax ring (we recommend the TOTO Universal Wax Ring), toilet mounting bolts, and a water supply line separately. These add roughly $20-$30 to the total cost. Additionally, you may need a specific mounting kit if your rough-in is 10 or 14 inches. For the best overall package, check the TOTO Aquia IV review and rating on Amazon for current bundle deals.

What happens if something goes wrong — warranty and support?

The ceramic bowl and tank carry a limited lifetime warranty. The WASHLET S2 seat electronics are covered for 1 year. TOTO’s support team is responsive by phone and email. Most issues reported online involve hard water scale, which is considered a maintenance item and not covered by warranty.

Where should I buy it to get the best price and avoid counterfeits?

We recommend purchasing from this authorized retailer to ensure you receive a genuine TOTO product with full warranty coverage. Avoid third-party sellers on other platforms offering significant discounts, as counterfeits and gray market units are a known issue in this luxury plumbing segment.

Does the bidet seat have a warm air dryer?

Yes, the S2 WASHLET includes a warm air dryer with three variable settings. It functions well, but like most bidet dryers, it is not a replacement for a quick pat dry with toilet paper for most users. The oscillating spray cleans thoroughly enough that a single square of TP is usually sufficient.

Can I use the toilet normally if the bidet electronics fail?

Yes. The Aquia IV toilet bowl and tank are fully mechanical. If the WASHLET seat malfunctions, the toilet still flushes normally using the manual flush buttons on the tank. You will simply lose the bidet, heated seat, and night light functions until the seat is repaired.