TOTO Nexus vs Carlyle II: The Better Buy Might Surprise You!

Choosing between the TOTO Nexus and the TOTO Carlyle II is one of the trickiest decisions you’ll face when shopping for a premium one-piece toilet.

Both are sleek, skirted, CEFIONTECT®-glazed performers — but the differences in design, rough-in flexibility, and WASHLET+ compatibility could make one a far better fit for your bathroom than the other.

Feature	TOTO Nexus (MS642124CEFG)	TOTO Carlyle II (MS614114CEFG)
Image
Dimensions (D x W x H)	28.6″ x 17.5″ x 27″	28.3″ x 16.5″ x 28.8″
Bowl Shape	Elongated	Elongated
Flush System	TORNADO FLUSH® 1.28 GPF	TORNADO FLUSH® 1.28 GPF
Surface Glaze	CEFIONTECT®	CEFIONTECT®
Design Style	Low-profile, modern skirted	High-profile tank, classic skirted
WASHLET+ Ready	Yes (T40 compatible)	Available on WASHLET+ model (MS614124)
Rough-In Flexibility	12″ standard (14″ adapter available)	10″, 12″, or 14″ via UniFlfit adapter
Buy Now

1. TOTO Nexus One-Piece Elongated Toilet (MS642124CEFG)

The TOTO Nexus is TOTO’s most popular modern one-piece toilet — a sleek, low-profile skirted design that looks as much like a piece of bathroom furniture as it does a toilet.

It’s built for buyers who want a fully contemporary look, effortless WASHLET+ integration, and TOTO’s top-tier flushing and surface technology in a single package.

Features

One-piece elongated skirted design — no visible trapway, no hidden cleaning gaps
TORNADO FLUSH® system at 1.28 GPF — dual-nozzle centrifugal rinsing for a powerful, efficient flush
CEFIONTECT® ceramic ion-barrier glaze — prevents waste from adhering so the bowl stays cleaner longer
Universal Height at 16.1″ bowl height — comfortable for a wide range of users
WASHLET+® T40 compatible — conceals supply line and power cord directly in the bowl channel for a cord-free look
Auto Flush compatible — works with TOTO Auto Flush WASHLET kits
12″ rough-in standard; 14″ adapter available separately
ADA, WaterSense®, CALGreen, and CEC compliant
Includes SS124 SoftClose® seat and left-hand chrome trip lever

Pros

Ultra-modern low-profile silhouette — one of the sleekest toilets TOTO makes
WASHLET+ T40 ready out of the box — no extra version to hunt for
Auto Flush compatible for full touchless bathroom automation
TORNADO FLUSH + CEFIONTECT® is a devastating combination for bowl hygiene
Easy to clean — the fully skirted base leaves nowhere for grime to hide

Cons

Limited rough-in flexibility — 12″ only (14″ adapter is available but 10″ is not)
Low-profile design means the tank is less visible, which some buyers find harder to service
Heavier than two-piece alternatives — professional delivery is a good idea

If you’re designing a modern bathroom and want a toilet that plays well with a TOTO WASHLET bidet seat — especially the S5 or S7 — the Nexus is the cleaner, more integrated choice.

It’s also the right pick if you want to build toward full bathroom automation, since Auto Flush compatibility is baked in from day one.

Check its current price on Amazon

2. TOTO Carlyle II One-Piece Elongated Toilet (MS614114CEFG)

The TOTO Carlyle II is a longtime TOTO classic — a high-profile, one-piece skirted toilet that brings the same flushing power as the Nexus in a taller, more traditional silhouette.

It’s especially popular with buyers who have tricky rough-in situations or prefer the more substantial, commanding presence of a taller tank profile.

Features

High-profile one-piece elongated skirted design — taller tank, more traditional aesthetic
TORNADO FLUSH® at 1.28 GPF — same centrifugal dual-nozzle technology as the Nexus
CEFIONTECT® ceramic glaze — ion-barrier surface that keeps the bowl cleaner between scrubs
Universal Height at 16.1″ bowl height — ADA compliant
UniFlfit rough-in system — adapts to 10″, 12″, or 14″ rough-in with optional adapter (sold separately)
WASHLET+ compatible version available (MS614124CEFG) for concealed cord integration
ADA, WaterSense®, CALGreen, and CEC compliant
Includes SS114 SoftClose® seat and left-hand chrome trip lever

Pros

Best rough-in flexibility of any TOTO one-piece — works with 10″, 12″, or 14″ via UniFlfit adapter
Classic high-profile tank design appeals to buyers who prefer a traditional, substantial look
Same TORNADO FLUSH® + CEFIONTECT® performance as more expensive TOTO models
Long-established model with a deep track record of reliability
WASHLET+ compatible version (MS614124CEFG) available for those who want concealed cord routing

Cons

The standard MS614114CEFG is NOT the WASHLET+ channel version — you need to buy MS614124CEFG separately for that feature
High-profile design is noticeably taller — less suited to minimalist or modern bathroom aesthetics
Not Auto Flush compatible

The Carlyle II is a particularly smart choice when you’re replacing an older toilet in a bathroom where the rough-in distance isn’t exactly 12″ — the UniFlfit system gives you a flexibility the Nexus simply can’t match.

You can see how TOTO’s other one-piece options compare in the Aimes vs Aquia IV comparison if you want to explore the full premium one-piece lineup before deciding.

Check its current price on Amazon

Design & Aesthetics: Modern vs Classic

This is where the two toilets diverge most sharply — and for many buyers, it ends the debate immediately.

The Nexus has a low-profile, contemporary silhouette that makes the tank look almost flush with the back of the bowl.

It’s the kind of toilet you see in high-end bathroom renovations and interior design magazines.

The Carlyle II, by contrast, has a taller, more commanding presence with a high-profile tank.

It reads as a premium toilet — but one with a more traditional, timeless aesthetic that suits classic or transitional bathroom styles.

If you’re designing a modern, spa-like bathroom, the Nexus wins decisively on aesthetics.

If your bathroom has traditional fixtures and a more classic feel, the Carlyle II will look at home in a way the Nexus might not.

For more on how design aesthetics work across TOTO’s lineup, the TOTO AP vs EP wall-hung toilet comparison is a great read if you’re also considering wall-hung options.

Winner: Nexus — for modern bathrooms; Carlyle II wins in traditional settings. Choose based on your aesthetic direction.

Flushing Performance: A Dead Heat

Here’s the good news: you don’t have to compromise on flushing performance no matter which toilet you choose.

Both the Nexus and the Carlyle II run the same TORNADO FLUSH® system — a hole-free rim design with dual nozzles that creates a powerful centrifugal, cyclonic rinsing action.

Both are rated at 1.28 GPF, both carry WaterSense® certification, and both are paired with CEFIONTECT® glaze — TOTO’s ion-barrier ceramic coating that actively prevents waste from sticking to the bowl surface.

In independent MaP (Maximum Performance) testing, the Carlyle II scores an impressive 1,000 grams — meaning it clears the maximum test load in a single flush.

The Nexus performs similarly at this water volume.

If bowl hygiene is a priority for you, pairing either toilet with a quality WASHLET bidet seat will further reduce the need for cleaning, especially models with PREMIST pre-coating technology.

Winner: Tie — identical flushing tech; you won’t notice a difference in real-world performance.

WASHLET+ & Smart Toilet Compatibility

This is one of the most practically important differences between these two toilets — and it’s easy to overlook if you’re buying them separately.

The TOTO Nexus (MS642124CEFG) comes WASHLET+® T40 ready right out of the box.

That means it has a channel built into the bowl surface that routes the bidet seat’s power cord and water supply line out of sight — giving you the clean, integrated look of a bidet toilet even though the seat and toilet are separate components.

The standard TOTO Carlyle II (MS614114CEFG) does NOT have this channel.

If you want WASHLET+ cord concealment with the Carlyle II, you need to buy the specific WASHLET+ version: the MS614124CEFG.

That’s a separate model number — so if you’re buying from a retailer, confirm which version you’re getting.

The Nexus also supports Auto Flush compatibility when paired with an Auto Flush-ready WASHLET kit — the Carlyle II does not.

If adding a premium WASHLET bidet seat is part of your plan, the Nexus is the cleaner, simpler path to that integrated look.

For a detailed look at which WASHLET seats work best in this kind of setup, our guide to the highest rated bidet toilets covers the full picture.

Winner: Nexus — WASHLET+ T40 compatibility and Auto Flush support give it a decisive edge for smart bathroom setups.

Rough-In Flexibility: The Carlyle II Wins Here

This is where the Carlyle II earns its reputation as a renovation-friendly toilet.

The Nexus is designed for a standard 12″ rough-in and can be adapted to 14″ with a separately sold adapter — but it does not support 10″ rough-in installations.

The Carlyle II uses TOTO’s UniFlfit rough-in system, which means a single toilet can be adapted to fit 10″, 12″, or 14″ rough-in distances by purchasing the appropriate optional adapter.

This is a major practical advantage in older homes, where the rough-in measurement can be non-standard — and where discovering your rough-in is 10″ after buying the Nexus would be a very expensive problem.

If you’re replacing a toilet in an older bathroom and aren’t 100% sure of your rough-in distance, the Carlyle II gives you a meaningful safety margin that the Nexus simply doesn’t offer.

The TOTO Drake vs Nexus comparison also explores rough-in considerations if you’re weighing a two-piece alternative as well.

Winner: Carlyle II — unmatched rough-in flexibility makes it the safer choice for renovation projects and older homes.

Installation & Ease of Setup

Both toilets are one-piece elongated designs, which means the tank and bowl arrive as a single unit — no aligning bolts, no tank-to-bowl gasket to worry about on-site.

Both include TOTO’s SoftClose® seat out of the box, a chrome trip lever, and standard connection hardware.

The Nexus requires a 12″ rough-in (or the optional 14″ adapter) and connects to a standard 12″ floor flange — installation is fairly standard for an experienced plumber or a confident DIYer.

The Carlyle II adds one extra step if you need a non-12″ rough-in: you purchase and attach the UniFlfit adapter before setting the toilet.

For WASHLET+ integration, the Nexus has a slight installation edge — everything you need is already designed into the bowl, and you just follow the standard T40 seat installation process.

With the Carlyle II WASHLET+ version, installation is equally clean — but you need to make sure you have the right model number (MS614124CEFG).

Both toilets are heavy — one-piece toilets always are — so having a second set of hands for the set step is strongly recommended for both.

If you want to understand how TOTO compares to other top manufacturers in terms of build quality and installation, our best bidet brands guide breaks it all down.

Winner: Tie — equally manageable installs with minor advantages for each in specific situations.

Verdict — Which One Should You Buy?

Both toilets are excellent, and you won’t go wrong with either one.

But the right pick depends on what your bathroom actually needs.

Buy the TOTO Nexus if…

You’re building or renovating a modern bathroom and want a contemporary, low-profile aesthetic
You plan to add a TOTO WASHLET bidet seat and want the cleanest possible cord-free integration (WASHLET+ T40 is built in)
You want Auto Flush capability as part of a fully automated bathroom setup
Your rough-in is a standard 12″ (or 14″ with the adapter)
You want TOTO’s most design-forward one-piece toilet at this feature level

Buy the TOTO Carlyle II if…

You’re replacing a toilet in an older home where the rough-in might be 10″, 12″, or 14″ — the UniFlfit system gives you flexibility the Nexus can’t match
You prefer a classic, high-profile one-piece look with a taller tank
You want a deeply proven, long-established TOTO model with years of real-world reliability data
WASHLET+ integration is not a priority, or you’re willing to buy the MS614124CEFG version separately for that feature
Your bathroom has a more traditional or transitional aesthetic that a low-profile modern toilet would clash with

For buyers who are adding a WASHLET bidet seat and want a completely seamless bathroom, the Nexus is the stronger recommendation.

For buyers renovating older homes or who want maximum installation flexibility, the Carlyle II is the smarter, safer choice.

Not sure which WASHLET seat to pair with your new toilet? Our bidet toilet seat comparison chart covers every major option side by side.

FAQ

Is the TOTO Nexus WASHLET+ compatible?

Yes — the TOTO Nexus (MS642124CEFG) is WASHLET+® T40 compatible right out of the box.

It has a channel built into the bowl surface that routes the bidet seat’s power cord and water supply line out of sight, giving you a clean, integrated look without any visible cords.

It is also Auto Flush compatible when paired with a compatible TOTO WASHLET kit.

Is the TOTO Carlyle II WASHLET+ compatible?

The standard Carlyle II (MS614114CEFG) is NOT the WASHLET+ channel version.

If you want WASHLET+ cord concealment with the Carlyle II, you need the dedicated WASHLET+ model: MS614124CEFG.

Both versions use the same TORNADO FLUSH® and CEFIONTECT® technology — the only difference is the bowl channel for cord routing.

For help choosing the right WASHLET seat, see our TOTO C5 vs S7 comparison or the Brondell Swash 1400 vs TOTO S5 guide.

What is the rough-in difference between the Nexus and Carlyle II?

The TOTO Nexus supports 12″ rough-in as standard, with a 14″ adapter sold separately.

It does not support 10″ rough-in installations.

The TOTO Carlyle II uses TOTO’s UniFlfit rough-in system, which can be adapted to 10″, 12″, or 14″ with the appropriate optional adapter.

If your rough-in distance is non-standard or uncertain, the Carlyle II offers significantly more flexibility.

Which TOTO one-piece toilet is better for a modern bathroom renovation?

The TOTO Nexus is the stronger choice for a modern renovation.

Its low-profile design, built-in WASHLET+ T40 compatibility, and Auto Flush support make it the more future-proof option for buyers who want a fully integrated, contemporary bathroom.

The Carlyle II is a better fit for traditional or transitional styles, or for buyers who need maximum rough-in flexibility.

For wall-hung alternatives in the same aesthetic direction, the TOTO AP vs EP guide is also worth reading.

Conclusion

The TOTO Nexus and the TOTO Carlyle II are both exceptional one-piece toilets — they share the same flushing technology, the same surface protection, and the same TOTO build quality that buyers have relied on for decades.

The Nexus is the pick for modern bathrooms, seamless WASHLET+ integration, and buyers who want a design-forward toilet that grows with a smart bathroom setup.

The Carlyle II is the pick for renovation projects, non-standard rough-in situations, and buyers who prefer the classic presence of a high-profile one-piece design.

Whichever you choose, you’re getting a toilet that will outperform and outlast most alternatives at this price point — and one that pairs beautifully with any of the WASHLET seats covered in our best bidets for existing toilets guide.

If you’re still exploring TOTO’s toilet lineup more broadly, our TOTO Drake vs Nexus vs Aquia IV comparison gives you a wider view of where each model fits in the range.