Choosing between the TOTO Neorest RS and AS is one of the most satisfying decisions you can face — both are world-class integrated smart toilets, but they are not the same.
This guide breaks down every real difference so you can pick the one that fits your bathroom, your budget, and the way you actually use a toilet every day.
| Feature | TOTO Neorest RS | TOTO Neorest AS |
|---|---|---|
| Image |  |
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| Dimensions (L x W x H) | 28-5/8″ x 15-3/16″ x 28-11/16″ | 28-5/8″ x 15-3/16″ x 28-11/16″ |
| Design Style | Rounded, soft curves | Angular, linear, edgy |
| EWATER+ Coverage | Wand + bowl | Wand + bowl + under seat |
| Wash Modes | Rear, soft rear, front (3 modes) | Rear, soft rear, front, wide front (4 modes) |
| Remote Control | Plastic block-style | 2-sided metal (premium) |
| User Presets | 4 | 4 |
| Flush System | Tornado Flush — 1.0 / 0.8 GPF | Tornado Flush — 1.0 / 0.8 GPF |
| Buy Now |  |
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1. TOTO Neorest RS (MS8341CUMFG#01)
The Neorest RS is TOTO’s entry point into their integrated smart toilet lineup, and entry point is a relative term here — this is still one of the most advanced toilets on the planet.
Its signature is a serene, softly curved silhouette with no sharp corners, designed to harmonize with virtually any bathroom aesthetic from modern to transitional.
It replaced the well-loved Neorest RH and brought meaningful upgrades: a new block-style remote with four user presets, a seamless seat design that eliminates the gap where dust collects, and the full suite of TOTO’s hygiene technology.
Features
- Rounded, organic design with soft curves and no sharp corners
- PREMIST automatically wets the bowl before every use
- EWATER+ sanitizes the wand and bowl after each use
- CEFIONTECT ceramic glaze prevents waste from sticking
- Tornado Flush — dual nozzle cyclonic rinse at 1.0 / 0.8 GPF
- Auto open/close lid and auto flush — fully hands-free
- Heated seat with 5 temperature levels
- Warm air dryer with 5 temperature settings
- Instantaneous water heater — unlimited warm water from the first second
- 3 wash modes: rear, soft rear, front — all with oscillating and pulsating options
- 4 user memory presets on plastic block-style remote
- Night light, auto deodorizer, ADA compliant, universal height
- 12″ rough-in, requires GFCI outlet within 4 feet
Pros
- More affordable entry point into the Neorest lineup
- Soft, rounded aesthetic suits a wide range of bathroom styles
- All the core TOTO hygiene technology — PREMIST, EWATER+, CEFIONTECT
- Four user presets — more than enough for most households
- Fully hands-free experience from approach to exit
- Limitless warm water via instantaneous heating
Cons
- EWATER+ does not spray under the seat (AS and LS both do)
- Plastic remote feels less premium than the AS metal remote
- No wide front wash mode
- Rounded design may feel less distinctive in a modern/angular bathroom
The RS is ideal if you want to step into the Neorest world without paying the AS premium — you still get TOTO’s legendary cleanliness and a completely hands-free experience that will change your bathroom routine permanently.
If you’re comparing this to a high-end bidet seat rather than a full toilet, our bidet toilet seat comparison chart shows you exactly what you gain by stepping up to an integrated unit.
Check its current price on Amazon
2. TOTO Neorest AS (MS8551CUMFG#01)
The Neorest AS replaced the Neorest AH and picked up meaningful feature upgrades along the way — most notably, EWATER+ cleaning that now also sprays underneath the toilet seat itself, which no other Neorest model at this price point offers.
The design language here is deliberately different from the RS: sharper angles, straighter lines, and a more architectural profile that suits design-forward and contemporary spaces.
It also ships with a premium two-sided metal remote that feels noticeably more refined than the RS’s plastic controller — and it adds a fourth wash mode (wide front) that the RS does not have.
Features
- Angular, linear design with sharp edges for a modern, architectural look
- PREMIST wets the bowl before every use
- EWATER+ sanitizes the wand, bowl, AND under the seat after each use
- CEFIONTECT glaze keeps the ceramic surface non-porous
- Tornado Flush — dual nozzle cyclonic rinse at 1.0 / 0.8 GPF
- Auto open/close lid and auto flush
- Heated seat with 5 temperature levels
- Warm air dryer with 5 temperature settings
- Instantaneous water heater — unlimited warm water
- 4 wash modes: rear, soft rear, front, wide front — with oscillating and pulsating
- 4 user memory presets on a two-sided metal remote
- Night light, auto deodorizer, ADA compliant, universal height
- 12″ rough-in, requires GFCI outlet within 4 feet
Pros
- EWATER+ under the seat — the most thorough auto-cleaning in this class
- Wide front wash mode is a genuine benefit for women’s hygiene
- Premium two-sided metal remote is more refined and intuitive
- Sharp, architectural design is distinctive in a modern bathroom
- All the same TOTO core technology as the RS — nothing sacrificed
Cons
- Higher price than the RS
- Angular design does not suit all bathroom aesthetics
- Both share the same footprint — no size advantage over the RS
The AS is the pick if you care about the most thorough automated cleaning available at this price point, you want a wide front wash mode, or you appreciate the feel of a metal remote in a luxury bathroom setting.
It’s also the stronger choice if you’re considering how this toilet fits alongside premium decor — particularly if you’ve already explored the difference between TOTO Colonial White vs Cotton White as part of a larger bathroom upgrade.
Check its current price on Amazon
Design & Aesthetic
This is the most immediately visible difference — and it matters more than most people initially expect.
The RS has a serene, flowing form with soft rounded curves and no sharp angles anywhere.
It’s a toilet that calms a bathroom rather than commands it, and it works beautifully in transitional, warm, or traditional spaces.
The AS takes the opposite philosophy — straight lines, sharp edges, and an angular silhouette that leaves an unmistakable visual impression.
It’s designed for bathrooms where fixtures are meant to be seen and where a contemporary, architectural aesthetic is the point.
Neither is objectively better — but your existing tiles, vanity, and overall design direction should drive the call here.
Winner: Tie — choose based on your bathroom aesthetic.
EWATER+ Hygiene Coverage
This is the most technically significant difference between the two models — and it breaks clearly in favor of the AS.
Both units use EWATER+ to sanitize the bidet wand and mist the toilet bowl with electrolyzed water after every single use.
The AS goes one step further: it also sprays EWATER+ underneath the toilet seat itself, targeting the area that standard auto-cleaning systems never reach.
If thorough, automated hygiene is your top priority — particularly for multi-person households or anyone managing sensitive health concerns — this under-seat cleaning is a meaningful upgrade.
It’s also worth noting that both units use PREMIST, which coats the bowl with water before each use, dramatically reducing how much actually sticks to the surface in the first place.
Combined with the CEFIONTECT ceramic glaze, you’re looking at toilets that need genuinely minimal manual cleaning either way — but the AS pushes that advantage even further.
Winner: TOTO Neorest AS — under-seat EWATER+ coverage is a real hygiene advantage.
Wash Modes & Feminine Hygiene
The RS offers three wash modes: rear cleanse, soft rear cleanse, and front cleanse — each with oscillating and pulsating spray options.
The AS adds a fourth: wide front cleanse, which provides a broader coverage area during feminine wash.
For women who prioritize front wash performance, this is a meaningful practical difference.
This is one of the clearest functional advantages the AS holds over the RS, and it’s worth weighing carefully if feminine hygiene is a major factor in your decision.
If you’ve been exploring the best heated bidet toilet seats specifically for women’s hygiene needs, you’ll recognize that dedicated front wash coverage consistently ranks as one of the most valued features.
Winner: TOTO Neorest AS — wide front wash mode adds meaningful feminine hygiene coverage.
Remote Control & Controls
Both units give you wireless remote control with four user memory presets.
Where they differ is in build quality and design.
The RS comes with a high-quality plastic block-style remote — clean, functional, and fully illuminated for nighttime use.
The AS remote is a two-sided metal design that is more streamlined, more premium in feel, and distinctly more fitting for a luxury bathroom installation.
If you’re spending at this level, the AS remote feels like the right companion to the investment.
Winner: TOTO Neorest AS — metal remote is a more premium experience for the price.
Flushing, Comfort & Shared Features
Outside those differences, these two toilets are remarkably similar — and that’s a good thing, because what they share is genuinely exceptional.
Both use the Tornado Flush system at 1.0 and 0.8 GPF, which creates a cyclonic vortex using dual nozzles through a rimless hole-free bowl — one of the most powerful and hygienic flush systems available.
Both deliver instantaneous warm water with no tank, meaning you never wait and you never run out.
Both offer five levels of seat temperature, five levels of dryer temperature, an auto deodorizer, a nightlight, a seamless seat, and a fully hands-free experience from the moment you walk into the bathroom to the moment you leave.
Both are ADA compliant and universal height, making them accessible for a wide range of users — including seniors who benefit from hands-free bidet features.
If you’re currently comparing these against a premium bidet seat rather than a full integrated toilet, our guide to the best toilets with bidet explains exactly what you gain — and give up — by going the integrated route.
Verdict — Which One Should You Buy?
Buy the TOTO Neorest RS if… you want the most affordable entry into the Neorest lineup, your bathroom design leans transitional or warm rather than sharply modern, and you’re comfortable with EWATER+ covering the wand and bowl (which is already exceptional hygiene for any toilet on the market).
It’s also the right call if you’re upgrading from an older integrated toilet or a premium WASHLET seat and want the full Neorest experience without the AS price premium.
If you’ve been comparing the Brondell Swash vs TOTO Washlet range and are now stepping up to an integrated unit, the RS is the natural landing point.
Buy the TOTO Neorest AS if… you want TOTO’s most thorough automated cleaning at this price point, you have women in the household who will use the wide front wash mode, you prefer the look and feel of a metal remote, and your bathroom has a modern or angular design where the AS’s sharp silhouette will feel intentional.
It’s worth noting that neither model is a compromise — both are genuinely exceptional.
The RS doesn’t cut corners on cleaning performance; it simply doesn’t extend EWATER+ under the seat.
The AS doesn’t add complexity for its own sake; every extra feature it offers has a practical hygiene or comfort benefit.
FAQ
Q: Are the TOTO Neorest AH and RH still available?
The Neorest AH and RH were discontinued by TOTO in 2023. The RS is the direct successor to the RH, and the AS replaced the AH. Both successors kept the same core technology and introduced several upgrades, including a seamless seat, four user presets, and (for the AS) under-seat EWATER+ cleaning. If you’re finding the AH or RH still listed somewhere, these are remaining stock — parts availability for discontinued models will become increasingly limited over time. The RS and AS are the current models to buy new.
Q: Will either toilet fit my existing bathroom rough-in?
Both the Neorest RS and AS require a standard 12-inch rough-in, which is the most common configuration in North American bathrooms. They also both require a grounded GFCI outlet located within approximately 4 feet of the toilet. If your current rough-in is not 12 inches, neither model will be a drop-in replacement without plumbing modifications. Always measure from the finished wall to the center of your floor drain before ordering either unit — these ship by freight in two parts and returns carry a restocking fee.
Q: Which model is better for a multi-person household?
Both models include four user memory presets, so anyone in the household can store their preferred spray position, water temperature, seat temperature, and dryer settings independently. For a multi-person household where hygiene across different users matters, the AS has a slight edge: the under-seat EWATER+ cleaning adds an extra layer of automated sanitation that the RS does not provide. The wide front wash mode on the AS is also a practical addition for households with women who prioritize feminine wash coverage. If you’re weighing how these compare to premium bidet seats for family use, our bidet toilet seat comparison chart provides helpful context.
Q: How does the Neorest RS or AS compare to stepping down to a WASHLET bidet seat?
A WASHLET seat like the S5 or S7 installs on your existing toilet and delivers many of the same bidet features — PREMIST, EWATER+, heated seat, warm air dryer, user presets — at a significantly lower price. The key advantages of the Neorest RS and AS are the fully integrated design (no separate seat unit, no exposed connections), the Tornado Flush system, CEFIONTECT glaze, and a fully hands-free experience including auto flush and auto open/close lid. If you’re not ready to replace your toilet, a WASHLET seat is an excellent step. If you are replacing the toilet, going fully integrated with the RS or AS eliminates compromise entirely. For a broader comparison of the full Neorest lineup, our guide to the highest-rated bidet toilets covers how integrated smart toilets compare to each other and to bidet seat setups.
Conclusion
The TOTO Neorest RS and AS are two of the finest integrated smart toilets available — and choosing between them comes down to a handful of genuinely practical differences rather than marketing.
The RS gives you TOTO’s full Neorest experience in a soft, rounded form at a lower price point — PREMIST, EWATER+ on the wand and bowl, Tornado Flush, unlimited warm water, and a completely hands-free bathroom experience.
The AS takes that and adds under-seat EWATER+ cleaning, a wide front wash mode, and a premium metal remote — at a higher cost that is entirely justified if those features matter to you.
Either way, you’re getting a toilet that will redefine what a bathroom can feel like — and that is a genuinely significant upgrade from anything you’ve experienced before.
For more help navigating TOTO’s lineup, explore our guides to the best bidets for home use, the TOTO AP vs EP wall-hung comparison, and the full best toilets with bidet roundup.
