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TOTO Nexus vs Aquia IV

Nexus and Aquia IV are two TOTO toilet lines that look similar on paper. Both are skirted, both carry CEFIONTECT glaze, and both take the same WASHLET+ seats.

The difference is the flush. Nexus is single flush; Aquia IV is dual flush at 1.28 and 0.9 gallons. Aquia IV also comes in Arc and Cube styling, and costs about $156 less at every washlet tier.

Toto Nexus vs Toto Aquia IV


What is the difference between TOTO Nexus and Aquia IV?

The TOTO Nexus and Aquia IV are both skirted toilet lines with concealed trapways, CEFIONTECT glaze and the same WASHLET+ bidet seat options. Nexus uses a single-flush TORNADO FLUSH system at 1.28 or 1.0 gallons per flush. Aquia IV uses DYNAMAX TORNADO FLUSH with a dual-flush button, 1.28 gallons for solids and 0.9 for liquids. Aquia IV also offers Arc and Cube styling variants and is the cheaper line.

Nexus flush
Single, 1.28 or 1.0 GPF
Aquia IV flush
Dual, 1.28 / 0.9 GPF
Styling options
One vs three
Price gap
About $156

What does each line offer?

Nexus spans 19 models from $1,245 to $2,522, in one- and two-piece and with a 1G option at 1.0 gallons per flush. Aquia IV spans 20 models from $1,089 to $2,380, all dual flush, in standard, Arc and Cube styling.

TOTO Nexus$1,245 – $2,522
19 models · single flush

One button, one flush volume. Available as 1G at 1.0 gallons per flush, the lowest single-flush rating TOTO offers in a skirted toilet.

Nexus suits you if…
  • You want the simplest possible flush
  • You want a true 1.0 GPF single flush
  • You prefer one clean, unbroken look
Browse all Nexus toilets
TOTO Aquia IV$1,089 – $2,380
20 models · dual flush · 3 styles

Dual flush across the range, with 0.9 gallons for liquids. The only one of the two offering Arc and Cube design variants, and cheaper at every equivalent trim.

Aquia IV suits you if…
  • You want a dual-flush button
  • You want Arc or Cube styling
  • You want to spend less at any tier
Browse all Aquia IV toilets

How do the TOTO Nexus and Aquia IV compare?

Both lines are skirted with CEFIONTECT glaze and the same washlet options. They differ on flush type, styling and price.

How do the TOTO Nexus and Aquia IV compare?
  TOTO Nexus TOTO Aquia IV
Flush type Single flush Dual flush
Flush system TORNADO FLUSH DYNAMAX TORNADO FLUSH
Water per flush 1.28 GPF, or 1.0 on 1G 1.28 full, 0.9 light
Styling variants One design Standard, Arc and Cube
Construction One-piece and two-piece One-piece and two-piece
Skirted trapway Yes Yes
CEFIONTECT glaze Yes Yes
EWATER+ and PREMIST Yes on WASHLET+ models Yes on WASHLET+ models
WASHLET+ tiers S2, S5, S7, S7A S2, S5, S7, S7A
Models in stock 19 20
Price range $1,245 – $2,522 $1,089 – $2,380

Is the TOTO Aquia IV cheaper than the Nexus?

Yes. Comparing the cheapest model at each washlet tier, Aquia IV undercuts Nexus by about $156.

Is the TOTO Aquia IV cheaper than the Nexus?
  TOTO Nexus TOTO Aquia IV
Toilet only $1,245 $1,089
With S2 washlet $1,252 $1,241
With S5 washlet $1,513 $1,357
With S7 washlet $2,110 $1,953
With S7A washlet $2,235 $2,079

Which Nexus or Aquia IV model should you buy?

Four common situations and the model that fits each, or browse the full Nexus and Aquia IV ranges.

TOTO Aquia IV Two-Piece Toilet - Universal Height - Main image of a white toilet on a white background
LOWEST PRICE
Aquia IV Two-Piece
$1,089.00
The cheapest way into either line. Dual flush, universal height, SoftClose seat included.
Toto Nexus 1G WASHLET+ S2 Two-Piece Toilet - 1.0 GPF - White toilet with a seat cover on a white background
LOWEST WATER USE
Nexus 1G with S2
$1,273.00 $1,992.00
A true 1.0 gallon flush every time, no button to think about.
TOTO Aquia IV Cube Washlet+ S7 Two-Piece - White toilet on a white background
DESIGN-LED BATHROOM
Aquia IV Cube with S7
$2,044.00 $2,920.00
Squared-off Cube styling. Nexus has no equivalent design variant.
TOTO Nexus One-Piece Toilet - White toilet on a white background
SIMPLEST TO LIVE WITH
Nexus One-Piece
$1,245.48 $1,697.00
One-piece, single flush, skirted. Nothing to explain to guests.

Should you choose TOTO Nexus or Aquia IV?

These two lines are closer than most TOTO comparisons. Both are fully skirted with a concealed trapway, both carry CEFIONTECT glaze, both come as one-piece or two-piece, and both take the same S2 through S7A WASHLET+ seats with EWATER+ and PREMIST.

The real difference is the flush. Nexus gives you one button and one volume. Aquia IV gives you two, 1.28 gallons for solids and 0.9 for liquids.

Whether dual flush actually saves water depends on how it gets used. On a typical mix of roughly four light flushes to one full, an Aquia IV averages just under a gallon per flush, which is about the same as a Nexus 1G at a flat 1.0. That is an estimate rather than a rating, and it assumes people use the smaller button. In a household where they will not, the single-flush 1G is the more reliable saving.

Styling is where Aquia IV pulls ahead. It comes in standard, Arc and Cube designs, so you can match a softer or a squarer bathroom. Nexus has one look, which is clean but fixed.

Price favours Aquia IV throughout. A bare Aquia IV is $156 less than a bare Nexus, and the gap holds at roughly $156 at the S5, S7 and S7A tiers. At S2 the two are within $11 of each other.

Choose Nexus if you want the simplest possible operation or a guaranteed 1.0 gallon flush. Choose Aquia IV if you want dual flush, a specific styling, or simply want to spend less for the same washlet.

Frequently Asked Questions

  • The flush. Nexus is single flush using TORNADO FLUSH at 1.28 or 1.0 gallons. Aquia IV is dual flush using DYNAMAX TORNADO FLUSH, with 1.28 gallons for solids and 0.9 for liquids. Aquia IV also offers Arc and Cube styling variants that Nexus does not.

  • It depends on use. A Nexus 1G flushes 1.0 gallons every time. An Aquia IV uses 0.9 gallons on the light setting and 1.28 on the full setting, so its real average sits close to 1.0 gallons if the light flush is used most of the time. If your household is unlikely to use the smaller button, the Nexus 1G gives the more predictable saving.

  • Yes, at almost every level. A bare Aquia IV starts at $1,089 against $1,245 for a bare Nexus, and Aquia IV is around $156 cheaper at the S5, S7 and S7A washlet tiers. At S2 the difference is only about $11.

  • Yes. Both lines have a fully skirted design with a concealed trapway, which means no exposed contours at the base of the bowl to clean around.

  • Yes. Both lines are available as WASHLET+ models with S2, S5, S7 or S7A seats, and both conceal the water supply line and power cord on those versions.

  • They are styling variants of the same toilet. Arc has softer, more rounded lines and Cube has a squared profile. Both share the Aquia IV dual-flush system and specifications. The Nexus line does not offer design variants.

  • Both lines offer one-piece models that take up less visual space, and both are elongated. Compare the individual product dimensions rather than the line, since footprint varies more by model than by range.

  • Yes. Both Nexus and Aquia IV offer one-piece and two-piece models, with and without a WASHLET+ seat fitted.

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