TOTO Aquia IV MS646124CEMFG#01 is my best dual-flush toilet overall because it combines an efficient 0.8/1.28 GPF split with a skirted one-piece bowl, Universal Height and an included SoftClose seat. If you need a compact round-front toilet, choose the KOHLER Wellworth K-3987. For the best balance of modern design, chair height and value, the WOODBRIDGE T-0019 is hard to ignore.
A one-piece 1.28/0.8 GPF toilet with a skirted bowl, Universal Height and included SoftClose seat.
A chair-height one-piece toilet with an elongated bowl, skirted exterior, seat and 1.0/1.28 GPF dual flush.
A conventional two-piece round-front toilet with a side lever and 1.1/1.6 GPF dual flush.
| Product | Best for | Flush | Bowl | Height | Rough-in |
|---|---|---|---|---|---|
| TOTO Aquia IV MS646124CEMFG#01 | Best Overall Premium | 1.28 / 0.8 | Elongated | Universal Height | 12 in. |
| KOHLER Wellworth K-3987-0 | Best Compact Round-Front | 1.1 / 1.6 | Round-front | Standard | 12 in. |
| Swiss Madison St. Tropez SM-1T254 | Best Modern One-Piece Value | 1.1 / 1.6 | Elongated | Comfort height | 12 in. |
| WOODBRIDGE T-0019 | Best Water-Efficient Value | 1.0 / 1.28 | Elongated | Chair height | 12 in. |
| HOROW T0338W | Best Budget Comfort Height | 0.8 / 1.28 | Elongated | 17.3 in. chair height | 12 in. |
| KOHLER Persuade Curv K-75790-0 | Best Two-Piece Chair-Height | 1.0 / 1.6 | Elongated | Comfort Height | 12 in. |
Best Overall Premium
The Aquia IV is the dual-flush toilet I would choose for a bathroom where design, cleaning access and water efficiency all matter. The 0.8 GPF partial flush is the lowest secondary flush in this shortlist, while the 1.28 GPF full flush stays within the high-efficiency range. That makes the split genuinely useful rather than a token difference between two buttons.
The completely skirted one-piece shell is a major ownership advantage. There are fewer exterior creases around the trapway to collect dust, and CEFIONTECT gives the bowl surface a smoother glaze. DYNAMAX Tornado Flush directs water around the bowl rather than relying on a conventional rim-hole pattern.
TOTO includes the SS124 SoftClose seat, which is important when comparing it with toilets such as the KOHLER Persuade Curv where the seat is extra. The standard configuration is 12-inch rough-in, and TOTO supports optional 10- and 14-inch UniFit adapters; do not assume those adapters are included with the standard toilet.
The biggest downside is price and weight. A one-piece fixture is harder to move through a house than a separate bowl and tank. If you want a compact, simple and less expensive dual-flush toilet, the KOHLER Wellworth is the better decision. If you want a modern skirted look for less, Swiss Madison or WOODBRIDGE deserve attention.
My pick: Choose Aquia IV when you want the most complete premium package, not merely the cheapest way to add a second flush volume.
Best Compact Round-Front
Wellworth is the smart pick when floor space matters more than an elongated bowl. The round-front shape shortens the projection and suits powder rooms where an elongated toilet can crowd the door swing or walkway. It also looks and installs like a familiar two-piece toilet instead of a modern push-button monolith.
The dual-flush control is a nested side lever rather than buttons on the tank lid. I like that in a traditional bathroom because the tank top remains usable and the control feels familiar. The 1.1 GPF partial flush cuts water use for liquid waste, while 1.6 GPF is available for the full flush.
This is not the toilet I would choose for someone who specifically wants chair-height seating. The rim is around the standard-height range, and the round bowl sacrifices some seated room. KOHLER Persuade Curv is the better KOHLER option when elongated Comfort Height is the priority.
Also account for the seat: the combination includes the bowl and tank, but the seat is separate. That can be an advantage if you already have a preferred seat, but it changes the true purchase scope compared with models that arrive with one.
My pick: Choose Wellworth for a small bathroom where compact projection and straightforward serviceability matter more than chair-height comfort.
Best Modern One-Piece Value
St. Tropez is the model I would shortlist when you want the look of a premium skirted one-piece toilet without paying TOTO money. The exterior is smooth, the trapway is concealed, and the quick-release soft-close seat is already part of the package.
The 1.1/1.6 GPF split gives you a traditional full-flush volume with a lower liquid-waste option. It is not as aggressive on water savings as the 0.8/1.28 Aquia IV or the 1.0/1.28 WOODBRIDGE, but some buyers will prefer having the 1.6 GPF full flush available.
The one-piece body is the main tradeoff. It is easier to wipe down, but heavier to move and less forgiving in a cramped installation. Check the 12-inch rough-in and the actual floor-to-seat dimensions before assuming “comfort height” automatically fits every user.
I would choose Aquia IV if the lowest partial flush and TOTO’s more premium flush/glaze system justify the extra spend. I would choose St. Tropez when style, included seat and value are the priorities.
My pick: Pick St. Tropez when you want the modern skirted look and a complete seat-included package at a more approachable level than the Aquia IV.
Best Water-Efficient Value
WOODBRIDGE hits a very appealing middle ground: the partial flush drops to 1.0 GPF, the full flush stays at 1.28 GPF, and the package still gives you an elongated chair-height bowl with a soft-close seat. For buyers who want a modern one-piece without paying for TOTO’s premium features, this is one of the strongest values.
The fully concealed trapway is more than a styling detail. It removes the deep external curves found on a conventional toilet, which makes weekly cleaning faster. The tradeoff is installation access—skirted toilets can hide the fasteners and supply area more than exposed-trapway designs.
I would choose this over the KOHLER Wellworth in a full-size bathroom because the elongated chair-height bowl is more comfortable for most adults and the seat is included. Wellworth still wins in a tight powder room because its round-front shape projects less.
The dual flush is also unusually conservative: 1.0 and 1.28 GPF are close enough that both modes remain efficient. That does mean the full flush is lower than the 1.6 GPF systems in Wellworth, St. Tropez and Persuade Curv, so buyers who specifically prefer a higher-volume full flush may look elsewhere.
My pick: Choose T-0019 when you want a modern complete package with efficient flush volumes in both modes and strong overall value.
Best Budget Comfort Height
HOROW is the budget pick I would choose when you still want the features people usually shop for in more expensive modern toilets: chair-height seating, an elongated bowl, a skirted one-piece shell and a soft-close seat. The 0.8/1.28 GPF split also matches the water-saving range of the premium TOTO Aquia IV.
The 17.3-inch bowl height puts it firmly in the taller-chair-height category before the seat is added, which suits many adults who dislike crouching down to a standard-height bowl. As always, taller is not universally better—shorter users and some children may prefer a lower seat.
The reason I still rank TOTO above it is refinement and ecosystem. Aquia IV brings CEFIONTECT, DYNAMAX Tornado Flush and WASHLET+ accommodation. HOROW wins when the purchase budget matters more than those extras.
Like every one-piece toilet here, the shell is heavy. Verify the delivery path and the 12-inch rough-in before it reaches the bathroom. The compact modern shape is appealing, but no one-piece toilet is fun to discover does not fit after it is unpacked.
My pick: Choose HOROW when you want the Aquia-style feature checklist at a tighter budget and can live without TOTO’s premium glaze and washlet ecosystem.
Best Two-Piece Chair-Height
Persuade Curv is the dual-flush toilet I would pick for someone who wants a skirted modern look but does not want to wrestle a full one-piece fixture into place. The bowl and tank move separately, while ReadyLock is designed to simplify mounting the skirted bowl at a standard 12-inch rough-in.
The 1.0/1.6 GPF split is wider than the WOODBRIDGE 1.0/1.28 setup. That means you can save aggressively on liquid waste and still have a conventional 1.6 GPF full flush available. The tradeoff is that full-flush water use is higher than the high-efficiency 1.28 GPF competitors.
Comfort Height and the elongated bowl make it a better adult everyday toilet than the standard-height round-front Wellworth for most full-size bathrooms. Wellworth is still the better compact choice where every inch of projection matters.
The seat is not included, so build that into the purchase. I actually like that for buyers who already know they want a specific quiet-close or bidet seat, but it makes Persuade less complete out of the box than TOTO, Swiss Madison, WOODBRIDGE or HOROW.
My pick: Choose Persuade Curv if you want a modern skirted, chair-height toilet but prefer the installation and service advantages of a two-piece design.
The two numbers matter because they define the toilet’s actual water-saving strategy. TOTO and HOROW use 0.8/1.28 GPF, WOODBRIDGE uses 1.0/1.28, KOHLER Wellworth and Swiss Madison use 1.1/1.6, and Persuade Curv uses 1.0/1.6. None is universally best.
For maximum efficiency, I prefer 0.8/1.28 or 1.0/1.28. They keep both modes below or at 1.28 GPF. A 1.1/1.6 or 1.0/1.6 system gives you a higher-volume full flush, which some buyers prefer, but you give up some water savings every time the full mode is used.
Dual flush only saves water when people use the partial flush appropriately. In a guest bathroom where everyone presses whichever button they see first, the theoretical savings can shrink. Clear controls and household habits matter more than the label on the tank.
Start with rough-in. A toilet can have perfect specifications and still be the wrong product if the flange is not where the toilet expects it. The main configurations here are 12-inch rough-in; TOTO Aquia IV can use optional UniFit adapters for other rough-ins, but those are separate parts and need to be planned deliberately.
Next choose round-front versus elongated. Round-front Wellworth saves floor space and is useful in powder rooms. Elongated bowls give adults more seating room and dominate the other five recommendations. Then decide on seat height. Standard-height Wellworth sits lower, while Universal Height, Comfort Height and chair-height models suit many adults who prefer a taller seat.
Do not treat a chair-height or ADA-labeled product as proof that the finished bathroom is accessible. Clearances, grab bars, control location and the rest of the room still matter. Choose the toilet for the user and project, then evaluate the complete installation.
One-piece toilets such as Aquia IV, St. Tropez, WOODBRIDGE and HOROW have smoother exteriors and no seam between a separate tank and bowl. They are easier to wipe down and look cleaner in a modern bathroom, but they are heavier to move during installation.
Two-piece Wellworth and Persuade Curv split the weight between bowl and tank. They are easier to carry up stairs and often simpler to service. Persuade keeps a modern skirted bowl, so it is a useful middle ground if you want a cleaner exterior without the full weight of a one-piece fixture.
Also check what comes with the toilet. Aquia IV, St. Tropez, WOODBRIDGE and HOROW include seats in the configurations covered here. Wellworth and Persuade Curv do not. A seat is not a trivial detail if you are comparing total purchase value or planning a bidet-seat upgrade.
I would not make that general claim either way. Clogging depends on the bowl/trapway design, flush system, drain condition and what is flushed. Compare the exact toilet rather than assuming dual flush is inherently better or worse.
Measure from the finished wall behind the toilet to the center of the closet flange or mounting bolts. Do not measure from the baseboard. Most toilets in this guide use a 12-inch rough-in in the selected configuration.
It can be when the toilet is designed around that volume. TOTO Aquia IV and HOROW T0338W use a 0.8 GPF partial mode specifically for liquid waste. Use the full flush for solid waste.
Neither is universally better. One-piece toilets have smoother exteriors and fewer seams; two-piece toilets are easier to carry and can be simpler to service. Choose based on installation, cleaning preferences and budget.
Not necessarily. Dual-flush mechanisms add another control path and more internal parts. If simple serviceability matters more than saving water between liquid and solid waste, a good single-flush high-efficiency toilet may be the smarter purchase.
