Best Double Cyclone Flush Toilets (TOTO)

Double Cyclone is the name TOTO gave to a specific way of moving water around the bowl: instead of a ring of small holes under the rim that drip water down the sides, a Double Cyclone bowl uses two larger nozzles set high inside the rim. Those two nozzles fire water in opposing arcs that meet and swirl, creating a cyclone-shaped rinse that wraps the entire inner surface of the bowl before steering down toward the siphon jet. The swirl does two jobs at once. It rinses every part of the bowl surface evenly, and it builds enough momentum to pull a full load through the trapway in a single pass, all on a low 1.28 gallons of water.

The payoff of this design is cleaning without scrubbing and power without waste. Because the two nozzles direct water deliberately rather than scattering it through dozens of tiny rim holes, a Double Cyclone toilet rinses the bowl more completely and has almost no small openings where hard-water scale can build up over the years. That is the original reason TOTO created the system, and it is why so many of its mid-range bodies wear the Double Cyclone label. If you want to compare flush power across every system and brand, our pillar guide to the best flushing toilets covers the wider field. This page stays focused on TOTO's Double Cyclone (and the closely related Dynamax Tornado) models, which are among the cleanest-rinsing low-water flushers you can buy.

What Is TOTO Double Cyclone Flush?

The simplest way to picture it is to compare it with an old toilet. A conventional bowl drips water through a ring of small holes under the rim, which can leave dry streaks, rinse unevenly and slowly plug with hard-water scale. Double Cyclone throws that ring out. In its place sit two larger nozzles positioned to send water around the bowl in opposing swirls that combine into a cyclone. That swirl wets every part of the surface and builds momentum toward the trapway, which is why a Double Cyclone toilet can hit a strong flush on so little water while keeping the bowl visibly cleaner between cleanings.

It helps to know the naming history, because it confuses a lot of buyers. Double Cyclone was the label TOTO used widely from the late 2000s onward on its mid-range single-flush and dual-flush bodies. Around 2018 the company began folding most of these designs under the broader Tornado Flush and Dynamax Tornado banners, which describe the same two- or three-nozzle swirl idea. So when you shop today you will find the original Double Cyclone wording on older listings and the Dynamax Tornado wording on the current Aquia IV and similar bodies, even though the underlying flush is the same nozzle-driven cyclone. For buying purposes, treat them as one family and judge the model by its MaP score and glaze, not the name on the box.

1

Best overall

TOTO Aquia IV

4.6 Twin-nozzle dual flush

The Aquia IV is the toilet most people land on when they want the original two-nozzle cyclone rinse in a current body, pairing the Dynamax Tornado swirl with a skirted dual-flush shell and CeFiONtect glaze to clear an 800 gram MaP load on a low water budget.

Flush TypeDynamax Tornado, dual

GPF0.8 / 1.28

MaP Score800 grams

Bowl HeightComfort, skirted

Warranty1-year limited

Best For

• Water-conscious homes that want a low effective GPF
• Buyers who want a modern skirted, wipe-clean base
• Hard-water homes tired of scrubbing scale from rim holes

Not Ideal For

• Households that want the maximum 1,000 gram MaP score
• Anyone wanting the simplest single-flush valve to service

Water leaves the tank through two nozzles rather than a ring of small holes, so it sweeps around the bowl as a cyclone before driving the siphon jet. That swirl rinses the entire surface evenly and pulls waste through cleanly, and because it works on water shape and gravity rather than compressed air, the flush is a smooth rush instead of a loud blast. The dual handle lets you pick a 0.8 gallon liquid flush or a 1.28 gallon solid flush.

It is fully skirted, so the trapway contours are hidden and the base wipes clean in seconds, and the bowl carries CeFiONtect glaze that helps waste and scale slide away. Owner reviews are consistent, praising the clean rinse, the quiet flush and the water savings. The tradeoffs are minor: the full-flush MaP score is 800 grams rather than the 1,000 gram ceiling, and the dual-flush valve is slightly more involved to service than a single-flush unit.

Expert Take

If you only remember one model from this page, make it the Aquia IV. It is the most refined expression of the Double Cyclone idea you can still buy new, combining the two-nozzle rinse, a skirted easy-clean base and real dual-flush water savings. In real households the 800 gram flush almost never struggles, so chase the 1,000 gram Vespin II only if you specifically want the highest possible clog insurance.

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Bottom Line: The cleanest-rinsing, most water-efficient way to get TOTO's two-nozzle cyclone flush in a modern skirted body.

2

Strongest flush

TOTO Vespin II

4.6 Skirted full-power flush

The Vespin II carries TOTO's two-nozzle swirl wash on a skirted single-flush body that reaches the full 1,000 gram MaP ceiling at 1.28 gallons, making it the strongest-clearing toilet in the cyclone family.

Flush TypeTornado, single, gravity

GPF1.28

MaP Score1,000 grams

Bowl HeightComfort, skirted

Warranty1-year limited

Best For

• Buyers who want the maximum 1,000 gram clog insurance
• People who hate cleaning around exposed trapway contours
• Modern bathrooms wanting a clean, concealed profile

Not Ideal For

• Installers, since skirted bowls use a special mounting
• Anyone wanting dual-flush water savings

The two-nozzle cyclone rinse is the same clean-sweeping action as the Aquia IV, but the single-flush body and wider flush valve push the MaP score to the practical 1,000 gram ceiling. That is the most solid-waste clearing any low-water toilet achieves, so it is the pick when clog resistance outranks everything else. The skirt smooths over the sides of the bowl so there are no trapway curves to wipe around.

The catch is installation: skirted toilets mount differently from a standard floor-bolt setup, so a first-time installer should read the instructions carefully or hire it out. Owner reviews highlight the strong, quiet flush and the easy-clean base as the two reasons they chose it over a conventional two-piece. As a single-flush model it gives up the Aquia IV's 0.8 gallon liquid setting, so it uses a touch more water per day.

Expert Take

The Vespin II is the answer for anyone who loved the cyclone rinse but wanted the maximum 1,000 gram MaP score in a skirted look. You keep the clean two-nozzle wash and gain a base that wipes clean in one pass, at the cost of dual-flush savings. Just budget a little extra installation patience for the skirted mounting.

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Bottom Line: The full 1,000 gram cyclone flush in a skirted, easy-clean body for buyers who refuse to compromise on power.

3

Best one-piece

TOTO Carlyle II

4.6 Sleek seamless body

The Carlyle II takes the same two-nozzle cyclone wash and puts it in a low-profile, seamless one-piece body with a skirted base and CeFiONtect glaze, clearing 800 grams on the MaP test with a dual flush.

Flush TypeDynamax Tornado, dual

GPF0.8 / 1.28

MaP Score800 grams

Bowl HeightComfort, skirted

Warranty1-year limited

Best For

• Buyers who want a clean, seamless one-piece look
• People who hate scrubbing a tank-to-bowl seam
• Modern bathrooms wanting a low, sculpted profile

Not Ideal For

• Tight-budget shoppers, since one-pieces cost more
• Solo installers, because the body is heavy to lift

It carries the same nozzle-driven cyclone rinse as the Aquia IV, so you give up nothing on bowl cleaning while gaining a seamless silhouette that has no tank seam to scrub. The skirted base hides the trapway and wipes clean fast, and the glazed bowl keeps routine cleaning quick. The dual handle gives a 0.8 gallon liquid flush and a 1.28 gallon solid flush.

This is the pick for buyers who want the cyclone flush, a low-maintenance glazed bowl and a sculpted modern look in one package. As a one-piece it is heavy, so a helper is wise during installation, and it sits above the two-piece bodies on price. The 800 gram MaP score is plenty for a normal home, but it is not the 1,000 gram ceiling of the Vespin II.

Expert Take

Choose the Carlyle II when the seamless, low-slung look genuinely matters to you, because you pay extra for it and gain no flush power over the Aquia IV. Where it earns its keep is appearance and long-term cleaning: no tank seam plus a skirted base plus a glazed bowl means the fixture stays presentable with almost no effort, which is why it is a favorite in design-led bathrooms.

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Bottom Line: The same 800 gram cyclone flush as the Aquia IV, wrapped in a seamless, low-profile one-piece body.

4

Best dual-flush one-piece

TOTO Connelly

4.5 Universal-height dual flush

The Connelly is a high-profile one-piece that brings the two-nozzle cyclone wash to a universal-height body, combining a 0.9 gallon liquid and 1.28 gallon solid dual flush with CeFiONtect glaze for an 800 gram MaP clearing.

Flush TypeDynamax Tornado, dual

GPF0.9 / 1.28

MaP Score800 grams

Bowl HeightUniversal (ADA)

Warranty1-year limited

Best For

• Households wanting ADA-friendly universal height
• Buyers who like a taller, more traditional one-piece
• People who want dual-flush savings with a clean rinse

Not Ideal For

• Small children, who suit a standard-height bowl better
• Buyers chasing the maximum 1,000 gram MaP score

The Connelly uses the same nozzle-fed cyclone rinse as the rest of the lineup, so the bowl cleans evenly with no rim holes to scale over, and the dual handle trims daily water use. Its taller universal height and rounded one-piece styling make it a comfortable, traditional-looking choice for a primary bathroom.

It is a one-piece, so there is no tank seam to wipe, but it is heavy to lift into place. The 800 gram MaP score sits below the Vespin II, and the universal height is a little tall for very young children, so it suits adult households best. Owner reviews praise the quiet flush, the comfortable seat height and the easy-clean glazed bowl.

Expert Take

Pick the Connelly if you want the cyclone rinse and dual-flush savings in a taller, more classic one-piece than the low-slung Carlyle II. The universal height is genuinely comfortable for most adults and meets common ADA preferences, which makes it an easy recommendation for a main or accessible bathroom where a standard-height bowl would feel low.

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Bottom Line: The cyclone wash and dual-flush savings in a comfortable, ADA-height one-piece body.

5

Best compact

TOTO Nexus

4.5 Compact skirted one-piece

The Nexus is a compact, skirted one-piece that keeps the two-nozzle cyclone wash in a smaller footprint, clearing 800 grams on the MaP test at a single 1.28 gallon flush.

Flush TypeTornado, single, gravity

GPF1.28

MaP Score800 grams

Bowl HeightUniversal, skirted

Warranty1-year limited

Best For

• Small bathrooms and powder rooms short on space
• Buyers who want a seamless skirted look in a compact size
• Anyone who prefers a simple single-flush valve

Not Ideal For

• Buyers wanting dual-flush water savings
• People chasing the maximum 1,000 gram MaP score

The Nexus packs the same nozzle-driven cyclone rinse and a CeFiONtect-glazed bowl into a tidy skirted body, so it cleans evenly with no rim holes while taking up less room than a full-size one-piece. The single-flush valve is simple to service, and the skirted base wipes clean in seconds.

Its compact footprint is the headline strength, making it a strong choice for a powder room or a tight remodel. The tradeoffs are a single 1.28 gallon flush rather than a dual setup, and an 800 gram MaP score rather than the 1,000 gram ceiling. For most light-use second bathrooms, neither limitation matters in practice.

Expert Take

The Nexus is the cyclone-flush pick when floor space is genuinely tight but you still want the clean rinse and a seamless skirted look. It does not chase the highest MaP score, and it does not need to: in the small, lighter-use bathrooms it is built for, the 800 gram single flush handles everyday loads without drama while the compact body buys back valuable inches.

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Bottom Line: A compact, seamless one-piece that keeps the two-nozzle cyclone rinse for bathrooms where space is scarce.

6

Best traditional style

TOTO Promenade II

4.5 Classic full-power flush

The Promenade II wraps the two-nozzle cyclone wash in a curvy, traditional skirted body and pushes the single-flush MaP score to the full 1,000 gram ceiling at 1.28 gallons.

Flush TypeTornado, single, gravity

GPF1.28

MaP Score1,000 grams

Bowl HeightUniversal, skirted

Warranty1-year limited

Best For

• Buyers who want classic styling with full flush power
• Traditional bathrooms that suit a curvier silhouette
• People wanting the 1,000 gram MaP ceiling in a one-piece

Not Ideal For

• Modern bathrooms that want sharp, minimal lines
• Buyers wanting dual-flush water savings

The Promenade II pairs the clean nozzle-fed cyclone rinse with a single-flush valve and reaches the full 1,000 gram MaP score, so it clears as strongly as the Vespin II while wearing a softer, more traditional skirt. The CeFiONtect glaze keeps the bowl clean, and the universal height suits most adults.

Its styling is the differentiator: where the Carlyle II and Maris go sharp and modern, the Promenade II leans classic and curvy, which fits older or transitional bathrooms better. It is a single-flush body, so it gives up dual-flush savings, and the ornate shape has a couple more contours to dust than a flat skirted bowl.

Expert Take

The Promenade II is the cyclone-flush pick for buyers who want a traditional look without dropping flush power. It is one of the few classic-styled bodies that still hits the 1,000 gram MaP ceiling, so you get the strongest clearing in the lineup with styling that suits an older home, rather than being forced into a modern minimalist shape to get the power.

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Bottom Line: Full 1,000 gram cyclone power in a classic, curvy skirted body for traditional bathrooms.

7

Best for small rooms

TOTO Aquia IV (round-front)

4.5 Compact dual flush

The round-front Aquia IV keeps the two-nozzle cyclone wash, the skirted base and the dual flush of the elongated model in a more compact bowl, trading a little length for valuable floor space in a tight bathroom.

Flush TypeDynamax Tornado, dual

GPF0.8 / 1.28

MaP Score800 grams

Bowl HeightComfort, round front

Warranty1-year limited

Best For

• Small bathrooms and narrow water closets
• Rooms where a door or vanity limits bowl projection
• Buyers who want dual-flush savings in a compact body

Not Ideal For

• Taller adults who prefer a roomier elongated bowl
• Buyers chasing the maximum 1,000 gram MaP score

The two-nozzle cyclone wash, skirted base and CeFiONtect glaze carry over from the elongated Aquia IV, and the round-front body still clears 800 grams on the MaP test with the same 0.8 and 1.28 gallon dual flush, so you keep the clean rinse and water savings while saving a few inches of projection.

A round bowl is slightly less roomy than an elongated one for taller adults, which is the main tradeoff, but for a cramped layout that compromise is usually worth it. The skirted base still wipes clean fast, and the dual-flush valve is the same as the elongated model, so service and parts match.

Expert Take

Reach for the round-front Aquia IV only when floor space genuinely forces your hand, because an elongated bowl is more comfortable when you have room for it. Where space is tight, though, this is the rare compact toilet that gives up almost nothing, keeping the full two-nozzle cyclone rinse and dual-flush savings in a smaller footprint.

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Bottom Line: The Aquia IV cyclone flush and dual-flush savings in a compact round-front body for tight bathrooms.

8

Best modern look

TOTO Maris

4.4 Sculpted modern one-piece

The Maris is a sculpted, skirted one-piece that pairs the two-nozzle cyclone wash with a sharp, contemporary silhouette, clearing 800 grams on the MaP test with a 0.9 and 1.28 gallon dual flush.

Flush TypeDynamax Tornado, dual

GPF0.9 / 1.28

MaP Score800 grams

Bowl HeightUniversal, skirted

Warranty1-year limited

Best For

• Modern bathrooms wanting a bold, sculpted shape
• Buyers who want a seamless skirted one-piece
• People who like dual-flush savings with a clean rinse

Not Ideal For

• Traditional bathrooms that suit a curvier shape
• Buyers chasing the maximum 1,000 gram MaP score

The Maris uses the same nozzle-fed cyclone rinse and CeFiONtect glaze as the rest of the lineup, so the bowl cleans evenly with no rim holes, and the dual handle trims daily water use. Its distinctive flowing, modern shape is the reason to pick it over the more understated Carlyle II.

As a one-piece with a skirted base, it has no tank seam and wipes clean fast, though the sculpted form has a few more curves to dust. The 800 gram MaP score handles a normal home easily but sits below the 1,000 gram ceiling, and the bold styling is a love-it-or-not choice rather than a neutral pick.

Expert Take

The Maris is the cyclone-flush pick when the look of the toilet is part of the design statement of the room. You get the same clean two-nozzle rinse and dual-flush savings as the Aquia IV and Carlyle II, just in a bolder shell. Choose it for styling, not for any flush advantage, since on paper it clears the same 800 gram load as its plainer siblings.

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Bottom Line: The cyclone rinse and dual-flush savings in TOTO's boldest, most sculpted one-piece body.

Which Double Cyclone Toilet Has the Strongest Flush?

MaP (Maximum Performance) is the independent flush-test standard that measures how many grams of solid waste a toilet clears in a single flush. Anything that scores 1,000 grams has effectively maxed the test, so the single-flush Vespin II and Promenade II sit at the top on paper. The dual-flush bodies like the Aquia IV and Carlyle II clear 800 grams, which is still well above a normal load. If you want to compare the highest scorers across every brand and flush system, see our guide to the strongest flushing toilets with the highest MaP scores.

What Is the Best Double Cyclone Toilet for Preventing Clogs?

Clog resistance is not about water volume; it is about flush momentum and trapway smoothness. The two-nozzle cyclone wash builds momentum even at 1.28 gallons, and a glazed bowl removes rough ceramic where waste tends to snag. The Promenade II shares the same 1,000 gram, glazed recipe, so it resists clogs nearly as well, and the 800 gram dual-flush bodies are close behind. For the broader field of low-clog picks across all brands, see our guide to toilets that never clog.

Which Double Cyclone Toilet Offers the Best Value?

Value depends on what you are optimizing. If everyday savings win, the Aquia IV gives you the cyclone rinse plus a 0.8 gallon liquid flush that trims your water bill year after year. If you want maximum flush power per dollar, the Vespin II or Promenade II are the smarter buys because they hit the full 1,000 gram MaP score. For more strong-flush picks across brands, see our guide to the best toilet for heavy waste, which leans on powerful, affordable flushers.

What Is a Good MaP Score for a Double Cyclone Toilet?

For context, most households generate well under 250 grams of waste in a normal use, so even an 800 gram toilet has a wide margin. The reason buyers chase 1,000 grams is insurance: a higher score means the flush keeps clearing reliably as the toilet ages, after a low-water year, or with heavier loads. With a Double Cyclone model, the strength comes from the two-nozzle swirl feeding the siphon efficiently, so even the 800 gram dual-flush bodies clear a typical home without drama.

Double Cyclone vs Tornado Flush vs G-Max

TOTO uses several flush names, and they confuse buyers constantly. Double Cyclone was the original name for the two-nozzle swirl wash, and most of those designs are now marketed as Tornado Flush (single-flush) or Dynamax Tornado (dual-flush), which describe the same nozzle-driven cyclone with two or three openings. G-Max and E-Max are a different, older family that still use a wide flush valve but feed a more conventional bowl, often with a few rim openings, like the standard Drake. For buying purposes, treat Double Cyclone, Tornado and Dynamax Tornado as one cyclone family, and focus on the MaP score and glaze instead of the name on the box. Our companion guide to the best Tornado Flush toilets covers the overlap in detail.

Check the MaP score, not just the flush name

A two-nozzle swirl sounds powerful, but the MaP score tells you what it actually clears. Within the cyclone range, the single-flush Vespin II and Promenade II reach 1,000 grams, while the dual-flush Aquia IV, Carlyle II, Connelly and Maris sit at 800 grams. Both tiers clear a normal household, but if you want maximum clog resistance, choose a 1,000 gram model. Do not assume the Double Cyclone name alone guarantees the top score; always confirm the published MaP figure for the exact model you are buying.

Single-flush or dual-flush, one-piece or two-piece

A single-flush cyclone body like the Vespin II uses 1.28 gallons every time and keeps the valve simple, while a dual-flush body like the Aquia IV adds a 0.8 gallon liquid setting that saves real water over a year at the cost of a slightly more involved valve. A one-piece like the Carlyle II has no tank-to-bowl seam to clean and looks sleeker but is heavier to install, while a two-piece is lighter and easier to repair. Decide which body and flush tradeoffs fit your space, your water goals and your DIY comfort before you choose a model.

Confirm rough-in, bowl height and water efficiency

Even the best Double Cyclone toilet is useless if it does not fit. Rough-in is the distance from the finished wall to the center of the floor drain bolts, and most homes use 12 inches, though older houses sometimes have 10 or 14 inch rough-ins. Comfort and universal-height bowls sit around 17 to 19 inches off the floor and suit most adults, while standard height works better for small children. Every model here is EPA WaterSense certified at 1.28 gallons or less, so you also get the lowest water bills the category allows. Confirm rough-in and height before ordering so your TOTO installs cleanly the first time.