TOTO Neorest AS vs RS: What is the Difference?

The Neorest AS and the Neorest RS are the two most accessible models in TOTO's Neorest line of fully integrated smart toilets. Both share the same core technology, both pair clean modern design with the highest level of bathroom hygiene TOTO offers, and both ship at a price that opens the Neorest range without putting you into luxury vehicle money.

So which one belongs in your bathroom?

At Majestic Flush, this is the comparison we have the longest conversations about. The two units sit close in price, share more features than people realize, and the right answer comes down to design preference and a few specific functional differences. Here is the full breakdown.

What is Identical Between the AS and RS

Most of the Neorest experience is the same on both models, which is the most useful thing for a buyer to understand up front.

Both are one piece, fully integrated smart toilets. There is no separate Washlet seat to install on top of a separate bowl. The seat, the bidet, the heating, the deodorizer, the spray system, and the bowl are designed and engineered as a single unit.

• TORNADO FLUSH: Both use TOTO's dual nozzle centrifugal flush that uses two inlet jets to spin water around the bowl. There is no rim, which removes the hidden surface where bacteria typically build up in a standard toilet.
• CEFIONTECT Glaze: Both feature the ion barrier ceramic coating that resists soiling at a microscopic level. Particles cannot grip the surface easily, so the bowl stays cleaner between manual cleanings.
• PREMIST: Both models mist the bowl with water before every use to prevent waste from sticking to the dry ceramic.
• Core Comfort & Convenience: Both have an auto open and close lid with proximity sensing, an auto flush option, a heated seat, an instantaneous water heater for unlimited warm water, a heated air dryer, 4-user memory profiles, and both meet ADA universal height standards.

If you stop reading here, you have already understood that whichever Neorest you choose, the day to day experience will be excellent.

The Real Differences Between the AS and RS

While they share a lower ceramic base, these two models diverge significantly once you look at the top unit components. There are four distinct areas where they differ.

1. Design Language and Silhouette

TOTO built the Neorest range around different shapes to match distinct architectural styles:

• The Neorest RS features a soft, organic silhouette. The lines are completely curved, the tank section is rounded, and the overall feel is approachable. It fits fluidly into transitional, traditional, or relaxed modern spaces.

• The Neorest AS features a sleek, angular silhouette. It reads contemporary, using clean linear lines and a geometric profile. In modern bathrooms with sharp aesthetics, minimalist vanities, or square hardware, the AS pairs much better visually.

2. Under-Seat EWATER+ Sanitization

While both models use electrolyzed water (EWATER+) to automatically sanitize the bidet wand and mist the bowl after use, only the Neorest AS features the advanced under-seat EWATER+ spray. After you leave, the AS sprays an extra mist cycle upward into the tight gap where the seat rests on the bowl to prevent hidden grime buildup. The RS lacks this specific feature.

3. Seating Space and Ergonomics

Because of the aesthetic differences in the top casing, the lid hinges on the AS sit slightly (around 0.5") further back on the unit compared to the RS. This design choice gives the AS a larger, more open seating area. The RS feels slightly more compact because the lid mechanism takes up a bit more real estate at the back of the seat.

4. Remote Control Quality

• The RS Remote: Ships with a simpler, high-quality white plastic block-style remote.
• The AS Remote: Ships with a premium, metallic, stick-style remote control that feels substantial in the hand and features an LCD screen on the reverse side.

TOTO Neorest AS vs RS Feature Comparison Table

Who Should Buy the TOTO Neorest RS?

• You want luxury without overspending: The RS gives you the exact same wash pressure, the same unlimited warm water, the same flushing power, and the same auto lid convenience as the premium tiers.
• You have a transitional or traditional bathroom: The organic, egg-shaped silhouette blends seamlessly into spaces that are not aggressively modern.
• You want maximum value: There is no fully integrated Neorest that costs less while retaining TOTO's signature automation.

Who Should Buy the TOTO Neorest AS?

The AS is the right choice for design-focused buyers who want enhanced refinement and sharper styling.

• You are designing an ultra-modern space: The angular lines of the AS make a clear, high-end architectural statement.
• You want maximum automated hygiene: The inclusion of under-seat EWATER+ sanitization eliminates one of the most tedious manual cleaning pain points in the bathroom.
• You prefer premium touchpoints: The metallic stick remote and the extra seating room provide a distinct upscale experience every time you use it.

Installation Considerations

Both models share identical installation requirements:

• Electrical: You need a dedicated 120V GFCI outlet within four feet of the toilet centerline. We strongly recommend a dedicated 15-amp circuit because the instant water heater and air dryer draw significant current when running simultaneously.
• Plumbing: You need a standard 12-inch rough-in from the finished wall to the center of the drain flange. Neither model can accommodate a 10-inch or 14-inch rough-in configuration.
• Water Supply: A standard cold water line is all that is required, as the toilet heats the water on demand.

For our full structural checklist, visit the Smart Toilet Installation Guide on the Majestic Blog.

Frequently Asked Questions

Is the RS less hygienic than the AS?

The RS features the exact same TORNADO FLUSH, CEFIONTECT glaze, and EWATER+ wand/bowl sterilization as the AS. However, the AS gains a slight hygienic advantage due to its automated under-seat EWATER+ cleaning cycle.

Will either model work in a bathroom with a 10-inch rough-in?

No. Both require a standard 12-inch rough-in. If your home has a 10-inch rough-in, you will need to look at alternative smart toilet configurations or have the plumbing rough-in modified during a structural renovation.

Can I use either Neorest during a power outage?

Yes. Both models include a manual backup pull-cord flush option located inside the chassis that operates completely without electricity. The bidet functionality, heated seat, and auto-lid require power to resume.

Our Verdict

The Neorest RS is the ideal smart toilet for the vast majority of buyers. It delivers TOTO's elite hygiene and comfort automation at the lowest price point in the catalog, wrapped in a silhouette that fits almost any home style.

The Neorest AS is the premium alternative for buyers who want sharp, linear architecture, enhanced under-seat sanitation, and a more luxurious metallic remote interface.

If you are torn between the two and specific modern styling isn't a strict priority, save the difference and choose the RS. If you want the extra peace of mind that comes with under-seat self-cleaning and a sleeker look, the AS is worth every penny.

Click to view products: Explore the TOTO Neorest RS and the TOTO Neorest AS at Majestic Flush.

Related reading on the Majestic Blog:

• TOTO Neorest Comparison Guide: Which Model Is Right for You in 2026?
• TOTO Neorest LS Review 2026
• Smart Toilet Installation Guide: Electrical and Plumbing Requirements (2026)