TOTO WASHLET+ Aquia IV Cube Toilet review

Are you thinking about upgrading to the TOTO® WASHLET®+ Aquia IV® Cube Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with S5 Bidet Seat, Cotton White – MW4363446CEMFGN#01 for your bathroom?

Buy The TOTO WASHLET+ Aquia IV Cube Toilet On Amazon

Product at a glance

You want a quick snapshot to see if this model fits your needs, and this section gives you that clear overview. Below you’ll find the core features pulled from the product description and organized so you can decide if it’s worth a deeper read.

Category	Details
Product name	TOTO® WASHLET®+ Aquia IV® Cube Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with S5 Bidet Seat, Cotton White – MW4363446CEMFGN#01
Toilet type	Two-piece elongated bowl
Flush options	Dual flush: 1.28 GPF (full) and 0.9 GPF (partial)
Bidet seat model	S5 Bidet Seat (integrated WASHLET+)
Surface tech	PREMIST wets bowl before use
Wand cleaning	Self-cleans inside and out with EWATER+
Washing functions	Front and rear warm water washing with five adjustable temperature and pressure settings
Spray modes	Oscillating and pulsing options
Seat features	Heated seat with built-in night light
Dryer	Warm air dryer with five variable settings
Integration	Designed to conceal water supply and power cord for a seamless look
Finish color	Cotton White
Typical use-case	Residential bathrooms, high-end remodels, users seeking integrated bidet functionality

You can use this table to compare key specs at a glance and confirm whether this model matches your priorities like water efficiency, comfort, or advanced cleaning features.

Design and build quality

You care about how a toilet looks and how durable it feels, and this model aims to satisfy both considerations. The Aquia IV Cube adopts a modern, geometric profile that fits contemporary bathrooms while the two-piece construction balances cost and serviceability.

Exterior styling and fit

You’ll notice the cube-shaped, square-edge silhouette that gives a modern, architectural appearance and suits bathrooms with a minimalist or contemporary design. The elongated bowl adds comfort for most users while maintaining a compact footprint compared with some elongated options.

Materials and finish

You can expect vitreous china for the bowl and tank, which is standard in this class for strength and ease of cleaning. The Cotton White glaze masks stains well and provides a smooth, slightly glossy finish that resists soiling.

Integration of WASHLET+ and concealed components

You’ll appreciate that the WASHLET+ is built to hide the water supply and power cord, creating a clean aesthetic without exposed wires or hoses. The seamless integration is especially useful if you want the bidet look without the “added gadget” appearance.

Flushing performance and water efficiency

You want a toilet that flushes reliably while conserving water, and the dual-flush system here is built for that balance. The 1.28 GPF and 0.9 GPF options let you match flush volume to waste type, which should reduce water consumption over time.

Dual-flush operation

You’ll be able to choose the full 1.28 GPF flush for solid waste and the 0.9 GPF flush for liquids, lowering average household water use. This model’s dual flush is intended to meet efficiency standards while still delivering effective bowl clearance.

Real-world clearing ability

You should find that the flush performance is generally strong for a high-efficiency toilet, but results can vary depending on your local water pressure and drain line slope. In trials and user reports, TOTO toilets typically clear well on the higher setting and perform acceptably on the lower setting for liquids and light solids.

Noise and flush dynamics

You’ll notice a characteristic TOTO flush sound that’s not overly loud but effective, and the two-piece design minimizes vibration. If quiet operation is critical for you, consider that some high-performance single-flush toilets can be quieter, but the difference is usually modest.

Bidet functionality and cleaning performance

You likely prioritize hygiene and convenience, which is where the S5 Bidet Seat shines with multiple washing modes and a hygienic wand system. The combination of adjustable temperatures and pressures along with oscillating and pulsing streams helps you find settings that feel comfortable and effective.

Washing modes and adjustability

You’ll get front and rear washing with five temperature and pressure levels to tune the experience to your preference. The oscillating and pulsing stream options provide broader coverage and more thorough cleansing, which is helpful if you prefer dynamic spray patterns.

Wand design and EWATER+ self-cleaning

You’ll benefit from a wand that self-cleans both internally and externally using EWATER+ technology, which misting the wand with electrolyzed water to reduce bacteria and residue. This automated cleaning reduces your hands-on maintenance and increases sanitation confidence.

PREMIST bowl wetting

You’ll also notice the PREMIST feature that wets the bowl surface before each use, helping waste slide off and reducing the chances of stubborn staining. PREMIST works proactively to minimize clean-up and often reduces the need for scrubbing.

Get The TOTO WASHLET+ Aquia IV Cube On Amazon

Comfort features: heated seat, night light, and dryer

You want comfort beyond basic cleaning, and the Aquia IV with the S5 seat supplies several user-friendly amenities. These extras are aimed at creating an at-home spa-like feeling while also being practical for late-night trips.

Heated seat and adjustable warmth

You’ll enjoy the heated seat that reduces shock on chilly mornings, with temperature control letting you choose a setting that suits you. The warmth settings are helpful for households in cooler climates or for users with sensitivity to cold surfaces.

Built-in night light

You’ll find the built-in night light practical for bathroom visits at night, providing soft illumination without the need to switch on harsh overhead lights. This is convenient if you share a home and want low-disturbance nighttime use.

Warm air dryer and settings

You’ll get a warm air dryer with five variable settings, which reduces or eliminates the need for toilet paper depending on your preference. The dryer speeds and temperatures give you options, but note that drying time may vary and some users still prefer a quick towel for finishing.

Controls and user interface

You want controls that are intuitive and accessible, and the S5 typically offers a handheld wireless remote or side panel for the primary functions. The interface aims to be simple so you can quickly access wash modes, temperatures, and dryer settings.

Remote control features

You’ll find a remote with clearly labeled buttons for front/rear wash, temperature settings, and dryer activation, which is convenient for adjusting without touching the seat. Some versions also allow programmable presets so you can save your preferred settings.

Ease of use and accessibility

You’ll appreciate the layout if you prefer straightforward controls; features are logically grouped and easy to operate even for first-time bidet users. This makes it more accessible for older adults or anyone new to electronic bidet functionality.

Installation and setup

You want to know what’s involved before ordering, and installation on this model is moderate in complexity due to the electrical and water connections. If you’re handy, you can likely handle the installation yourself, but many people opt for professional help to ensure proper electrical hookups and concealment.

What’s in the box

You’ll typically receive the bowl, tank, S5 bidet seat and electronics, mounting hardware, and manufacturer-provided hoses and fittings. Check your specific retailer’s packaging list to confirm if batteries, power cords, or extra fittings are included.

Plumbing and electrical requirements

You’ll need a standard water supply with a shutoff valve and an electrical outlet near the toilet—usually a GFCI-protected outlet is recommended for safety. Because the WASHLET+ hides the power cord and water line, you may need to plan for routing or an outlet position that keeps the look seamless.

Installation tips and timeline

You’ll likely spend 1–3 hours if installing with moderate DIY experience, longer if routing a hidden cord or working with older plumbing. Use the included template for bolt placement, ensure a secure flange seal, and test the e-functionality before finalizing the trim.

Maintenance and cleaning

You want easy upkeep with features that reduce scrubbing, and TOTO’s PREMIST and EWATER+ systems are designed to cut down on manual cleaning. Still, you’ll want a regular maintenance schedule to keep both the toilet and electronics performing well.

Routine cleaning recommendations

You’ll want to use mild, non-abrasive cleaners for the ceramic surfaces and to avoid harsh chemicals that can degrade seals or the EWATER+ system. Wipe down the bidet seat with a soft cloth and manufacturer-recommended cleanser to avoid scratching or damaging electronic components.

EWATER+ and wand upkeep

You’ll appreciate the automated wand self-cleaning, but it’s still good practice to occasionally inspect the wand for mineral buildup or wear. If you live in a hard-water area, consider periodic descaling or using a water softening solution for the supply line to preserve performance.

Long-term part replacement and support

You’ll want to budget for occasional replacements like the wand or internal valves over years of use, and make sure your installer registers the product so you can claim warranty support if needed. TOTO typically provides good parts availability and service documentation.

Water efficiency and cost implications

You want to cut water expenses without sacrificing function, and the dual-flush options are intended to deliver that balance. Lower GPF settings reduce your water bill and environmental impact if you and your household use the lower flush appropriately.

Expected savings

You’ll likely see water savings compared with older 3.5–7 GPF toilets in your home, and the average household can reduce water usage per flush significantly. If you replace an older toilet, expect noticeable reductions in your water bill over months and years.

Environmental benefits

You’ll reduce your home’s water footprint by using 1.28 and 0.9 GPF settings, helping conserve municipal water resources and supporting sustainable home practices. Those savings multiply across households in high-population areas.

Pros and cons

You want a clear list of the major benefits and potential drawbacks so you can decide if this unit meets your priorities. Below is a straightforward assessment based on design, functionality, and user experience.

Major advantages

You’ll enjoy an integrated, streamlined look since cords and hoses are concealed, which improves bathroom aesthetics. You’ll get a comprehensive hygiene package with PREMIST, EWATER+, adjustable wash options, heated seat, night light, and dryer—features that justify a higher-end purchase.

Potential drawbacks

You’ll face a higher upfront cost than a standard toilet or basic retrofit bidet seat, and the integrated electronics add complexity to installation and potential repair needs. You’ll also need nearby power and possibly professional installation to fully conceal wiring, which may add to the overall expense.

How it compares to a separate bidet seat or standard toilet

You want to know whether to choose this integrated solution or go with separate components, and this section helps you weigh the trade-offs. Integration prioritizes aesthetics and a single-purchase convenience, while retrofit seats can be cheaper and simpler to install.

Compared to a standard toilet without a bidet

You’ll get far more hygiene and comfort features with the WASHLET+ than a standard toilet, but expect a higher cost and need for power. If you value hands-free cleaning and customizable functions, the upgrade is substantial.

Compared to adding a separate bidet seat to an existing toilet

You’ll avoid visible hoses and more modular installation issues because the WASHLET+ is designed to integrate. However, if budget is a major constraint or you want the flexibility to swap seats between toilets, a retrofit seat might make more sense.

When the integrated model makes sense for you

You’ll likely prefer the integrated WASHLET+ if you’re remodeling, want a seamless appearance, or plan to keep the toilet long-term. The integrated concealment and tailored fit provide clean visuals and careful engineering that retrofit solutions may not match.

Who this product is best for

You’ll want to match your lifestyle and bathroom needs to the features offered, and this model suits particular user profiles very well. It fits those who prioritize hygiene, comfort, modern design, and water-efficiency.

Ideal users

You’ll be satisfied if you enjoy tech-enabled home improvements, have space for an elongated bowl, appreciate a heated seat and dryer, and want a cleaner, more hygienic bathroom routine. It’s also a strong option for households with older adults, people with limited mobility, or those seeking a luxury upgrade.

When you might skip this model

You’ll reconsider if your budget is tight, if you lack an electrical outlet near the toilet, or if you plan to move soon and want a less expensive, more portable solution. Also skip this model if you prefer ultra-quiet operation above all else or need a toilet with specific commercial-grade certifications.

Pricing and value assessment

You want to assess whether the price is fair for the features offered, and this model generally sits in the premium tier. The comprehensive features yield long-term comfort and water savings, but up-front cost and installation can be significant.

Upfront cost vs long-term value

You’ll pay more initially compared with basic toilets, but you can recoup some costs through water savings and reduced toilet-paper use. The comfort and hygiene benefits also add intangible value if they improve daily quality of life.

Resale and longevity

You’ll likely see decent resale appeal if you keep the toilet in good condition and document maintenance because TOTO has strong brand recognition. Longevity depends on proper installation and care, but many users report years of reliable operation.

Installation checklist and quick tips

You want to prepare properly before the delivery and installation so it goes smoothly, and this checklist helps you plan accordingly. Gather tools and confirm requirements beforehand to minimize surprises.

Tools and supplies to have ready

You’ll want a wrench set, screwdriver, plumber’s putty or wax ring, level, and an adjustable wrench. Also have a GFCI outlet or plan for an electrician if one isn’t nearby, plus plumber’s tape and possible extension fittings for concealed routing.

Pre-installation checks

You’ll measure rough-in distance, confirm flange condition, verify outlet location, and check water supply shutoff accessibility. Doing this work ahead of time prevents delays and reduces the risk of having to rework the plumbing or electrical after the toilet arrives.

Troubleshooting common issues

You want to know what to do when things go wrong, and many common problems have straightforward fixes you can try before calling support. Below are typical issues and how to address them.

No power or controls not responding

You’ll first verify the outlet is working and the cord is securely connected; reset any GFCI tripped outlets and check the seat’s power switch. If power issues persist, consult the manual for fuse or internal reset options and contact TOTO support.

Weak flush or incomplete bowl clearance

You’ll check for clogging in the trap or supply issues; low house water pressure can reduce flush performance. If plumbing is clear, confirm the tank fill settings and that the flush mechanism is installed correctly.

Wand or nozzle problems

You’ll inspect the wand for mineral buildup or blockage and run the self-cleaning cycle. If it still fails to extend or spray, power-cycling the unit or checking the supply water pressure often resolves the issue; persistent mechanical faults may require service.

Frequently asked questions (short)

You want quick answers to the most common concerns before making a decision, and this short FAQ addresses those points. If you need additional details, the manual and TOTO support are good next steps.

• Will this toilet fit a standard 12-inch rough-in?
  You’ll find most TOTO two-piece models fit a 12-inch rough-in, but measure yours to confirm before buying.

• Can the power cord be fully hidden?
  You’ll be able to conceal the cord if your outlet and plumbing layout accommodate in-wall or behind-tank routing; a professional installer can help.

• Is the dryer strong enough to eliminate toilet paper entirely?
  You’ll notice the dryer reduces paper usage significantly, but many users still choose to use a small amount of toilet paper for final drying.

Final verdict

You’ll get a premium, thoughtfully engineered toilet and bidet system with the TOTO® WASHLET®+ Aquia IV® Cube Two-Piece Elongated Dual Flush 1.28 and 0.9 GPF Toilet with S5 Bidet Seat, Cotton White – MW4363446CEMFGN#01 if you value advanced hygiene, comfort, and a sleek integrated appearance. The dual-flush efficiency, PREMIST and EWATER+ cleaning features, and customizable bidet settings make it a strong option for homeowners looking for a long-term upgrade that reduces water use and improves daily comfort. If installation cost, outlet placement, or budget are major concerns for you, weigh those before committing, but for many buyers this model represents a meaningful and lasting bathroom improvement.

If you want, tell me about your bathroom layout and budget and I can help you determine whether this model will fit and what installation steps you’ll need to take next.

Order The TOTO Aquia IV Cube Toilet — Buy On Amazon

Disclosure: As an Amazon Associate, I earn from qualifying purchases.