The TOTO Neorest AS is a fully integrated smart bidet toilet that combines luxury design with hands-free automation — and it sits at the more accessible end of the premium Neorest lineup.
In this review, I’ll break down everything you need to know about the Neorest AS, from its self-cleaning systems to its real-world comfort, so you can decide if it belongs in your bathroom.
TOTO Neorest AS Specs
| Specification | Detail |
|---|---|
| Image |  |
| Model Number | MS8551CUMFG#01 |
| Dimensions (L x W x H) | 27-1/4″ x 15-1/4″ x 21-3/8″ |
| Flush System | TORNADO FLUSH® — 1.0 GPF / 0.8 GPF dual flush |
| Water Heating | Instantaneous (tankless — unlimited warm water) |
| Wash Modes | Rear, Soft Rear, Front, Oscillating, Pulsating |
| Hygiene Tech | EWATER+® (wand, bowl & under-seat), PREMIST®, CEFIONTECT® glaze |
| Controls | Ergonomic stick-style wireless remote — 4 user presets |
| Auto Open / Close | Yes — touchless sensor lid |
| Auto Flush | Yes — with manual backup |
| Heated Seat | Yes — 5 temperature settings |
| Warm Air Dryer | Yes — 5 temperature settings |
| Night Light | Yes — bowl and rear illumination |
| User Presets | 4 personalized memory settings |
| Colors Available | Cotton White (#01) only |
| Installation Type | One-piece integrated unit — professional install recommended |
| Warranty | 3-Year Limited (Residential) |
| Check Price |  |
Pros & Cons of TOTO Neorest AS
| ✅ Pros | ❌ Cons |
|---|---|
| Fully hands-free experience — auto lid, auto flush, auto clean | High price point — this is a serious investment |
| EWATER+ cleans wand, bowl, and under the seat automatically | Professional installation is strongly recommended |
| Instantaneous water heater — unlimited warm water, never runs cold | Only available in Cotton White — no color options |
| TORNADO FLUSH® is powerful, quiet, and ultra water-efficient | Requires a GFCI outlet within reach — electrical work may be needed |
| CEFIONTECT glaze and PREMIST® make the bowl nearly self-cleaning | Parts and servicing can be harder to source than standard toilets |
| Four user presets — perfect for multi-person households | Heavier than a bidet seat upgrade — harder to move or reposition |
| 3-year residential warranty — strong coverage for the category | Not a good fit if you want to keep your existing toilet bowl |
Check its current price on Amazon
Is the TOTO Neorest AS Worth It?
Yes — if your budget allows for a full integrated smart toilet, the Neorest AS is absolutely worth it.
It delivers a genuinely hands-free bathroom experience that a bidet seat simply cannot replicate.
The lid opens when you walk in, the PREMIST® wets the bowl before you sit, the EWATER+ system cleans the wand and bowl after every use, and the toilet flushes itself when you stand up.
You are not just buying a cleaner toilet — you are buying a completely different daily ritual.
For buyers who are comparing this to a seat-based upgrade like the TOTO Washlet S7, the key question is whether you want an integrated unit or prefer to keep your existing bowl.
If you want the cleanest, most automated experience possible without the price jump of the NX2 or LS, the AS is the sweet spot in the Neorest lineup.
Design and Build Quality
The Neorest AS has one of the cleanest silhouettes of any smart toilet on the market.
Its one-piece skirted design conceals the trapway entirely, leaving no exposed edges for grime to collect around the base.
The lines are sharp and architectural — more angular and modern than the rounder Neorest AH it replaced.
This is not a toilet that blends into the background — it makes a statement, and it earns it.
The seamless seat design is one of the most practical upgrades TOTO made with this generation.
There is no gap between the seat underside and the toilet — which means no hidden crevice for bacteria and debris to accumulate in.
Combined with the CLEAN LIFT® feature that lifts the top unit away from the bowl for easy cleaning, maintaining the AS is genuinely less work than a traditional toilet.
If you want to understand how TOTO’s color finishes impact appearance in real bathrooms, the TOTO Colonial White vs Cotton White guide is a useful companion read — particularly since the AS is Cotton White only.
Cleaning Performance
This is where the Neorest AS truly separates itself from bidet seats — and even from most competing smart toilets.
The TORNADO FLUSH® system creates a powerful centrifugal vortex using a hole-free rim design, which means every millimeter of the bowl gets reached with every flush.
There are no rim channels where residue can collect and grow.
At 1.0 GPF for heavier jobs and 0.8 GPF for everything else, it is one of the most water-efficient flush systems available — and it does not sacrifice performance to get there.
The CEFIONTECT® glaze is a nano-level ceramic coating that makes the bowl surface so smooth that waste cannot cling to it.
Add PREMIST® (which wets the bowl with water before you sit) and EWATER+ (which mists the bowl, wand, and under the seat after every use), and you have a toilet that is actively cleaning itself every time it is used.
If you’ve been researching self-cleaning bidet technology, this three-layer hygiene system — CEFIONTECT + PREMIST + EWATER+ — is the most complete implementation you will find in any residential toilet.
For context on how the Neorest fits into the broader landscape of integrated smart toilets, the best toilets with bidet roundup is a great place to compare options side by side.
Comfort Features
Sitting down on the Neorest AS is a noticeably different experience from a standard toilet — or even a premium bidet seat.
The heated seat activates automatically as you approach, so it is always at the right temperature when you need it.
The instantaneous water heater means your wash water is warm from the very first second — no tank to drain, no cold surprise mid-session.
You get five wash modes (rear, soft rear, front, oscillating, and pulsating), five water pressure settings, five water temperature settings, and five air dryer temperature options.
That is a level of personalization that covers every user in a household — which is exactly why the four-user memory preset system matters.
Each person in the family can store their preferred seat temperature, spray position, pressure, and dryer settings and recall them instantly with a single button.
The air deodorizer runs automatically and uses an O2-based system rather than a filter you need to replace on schedule.
The night light illuminates both behind the toilet and inside the bowl — making 2 a.m. trips to the bathroom genuinely stress-free without flipping a switch.
If you’ve been comparing this to a seat-based solution like the best bidets with warm water and dryer, the Neorest AS covers every comfort feature in that category and then some.
Controls and Installation
The Neorest AS is controlled entirely via a stick-style wireless remote with an ergonomic grip and clearly labeled buttons.
The remote mounts on the wall, so it is always within reach without fumbling around the side of the seat.
You can also open and close the lid and trigger a flush from the remote — useful for users with limited mobility.
Installation is a full toilet replacement — this is not a bidet seat you add to an existing fixture.
If you’re deciding whether a smart toilet combo makes more sense for your situation than adding a bidet seat, the bidet toilet vs bidet seat guide covers that trade-off in detail.
You will need a GFCI outlet within approximately 4 feet of the toilet, a standard 12-inch rough-in, and potable water supply.
TOTO strongly recommends a surge protector to protect the electronics, and professional plumbing installation is the practical choice for most buyers.
The 3-year residential warranty provides solid protection — notably longer than what most bidet seats in this price tier offer.
Who Is the TOTO Neorest AS Best For?
The Neorest AS is built for buyers who want a complete, fully automated bathroom upgrade — not just a bidet seat addition.
It is the right choice if you are renovating a primary bathroom and want a fixture that does everything without requiring any manual interaction.
It suits multi-person households particularly well, thanks to four programmable user presets that mean no one needs to reset settings between uses.
If you care deeply about long-term toilet bowl hygiene and hate scrubbing, the combination of CEFIONTECT, PREMIST, and EWATER+ means your bowl stays cleaner with significantly less effort than any standard toilet or bidet-seat combo.
It is also a strong option for seniors or anyone with limited mobility — the touchless, fully hands-free operation removes the physical challenge of managing controls mid-use.
For context on how the AS sits within the broader Neorest lineup, the highest-rated bidet toilets guide covers where different models excel.
If you want the Neorest experience but at a higher tier, models like the Neorest LS and NX2 are worth exploring — though the AS represents the best value entry point into the lineup.
And if you’re not ready for a full toilet replacement, a seat-level option like the TOTO Washlet S7 delivers many of the same hygiene features without the full install commitment.
FAQ
Is the TOTO Neorest AS replacing the Neorest AH?
Yes — the Neorest AS is the direct successor to the Neorest AH.
Key upgrades include a more angular, modern design, a seamless seat that eliminates the gap between seat and bowl, four user presets (up from two on the AH), and EWATER+ coverage extended to the area under the seat.
The AS is now the standard mid-tier model in the Neorest lineup, positioned below the LS, RS, and NX2.
Does the TOTO Neorest AS work with a round toilet rough-in?
The Neorest AS is designed for a standard 12-inch rough-in and features an elongated bowl.
It is not a bidet seat you fit to an existing bowl — it is a complete one-piece integrated toilet.
Before ordering, measure your rough-in distance (from the wall behind the toilet to the center of the floor drain) to confirm the standard 12-inch specification matches your bathroom.
What does EWATER+ actually do on the Neorest AS?
EWATER+ is electrolyzed water — regular tap water run through a process that transforms it into a mild, chemical-free sanitizing agent similar to a very dilute bleach solution.
On the Neorest AS, EWATER+ automatically mists the wand before and after every use, the inside of the bowl after every flush, and under the seamless seat — all without any user input.
The result is a toilet that is actively cleaning itself throughout the day, reducing how often you need to scrub with chemical cleaners.
How does the Neorest AS compare to adding a TOTO Washlet seat?
A TOTO Washlet seat like the S5 adds bidet features to your existing toilet at a fraction of the cost and without replacing the toilet itself.
The Neorest AS, by contrast, is a complete toilet replacement that adds automatic lid operation, auto flush, a more powerful flush system, a fully integrated design with no exposed cords or hoses, and bowl-level EWATER+ hygiene that a seat-only solution cannot deliver.
If your existing toilet is in good condition and you just want the bidet features, a Washlet seat is the smarter value play.
If you are renovating or replacing an aging toilet anyway, the Neorest AS justifies the upgrade with a fundamentally better bathroom experience.
Conclusion
The TOTO Neorest AS is one of the best all-in-one smart toilets you can buy at its price point — and it earns that title by delivering a genuinely complete, hands-free bathroom experience.
The combination of CEFIONTECT glaze, PREMIST, TORNADO FLUSH, and EWATER+ means your toilet bowl stays cleaner with less effort than any bidet-seat-on-standard-toilet setup can match.
Four user presets, unlimited warm water, a seamless seat, and a 3-year warranty round out a package that is hard to argue with if you’re serious about upgrading your primary bathroom.
The price is real — and professional installation adds to the total cost.
But for buyers who are ready to commit to a full bathroom fixture upgrade, the Neorest AS delivers everything it promises.
If you’re still deciding between a full smart toilet and a bidet seat, check out the bidet toilet vs bidet seat comparison to weigh the trade-offs — and if you want to see how the AS fits into the wider smart toilet landscape, the best toilets with bidet guide is the perfect next read.