The best dual-flush toilets
The full flush is the same everywhere now. The small button is where the water gets saved, and the makers publish very different numbers for it.
By Sawyer V. · · How we research
The short answer
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Quick picks
Tap any row for the full write-up. Prices are checked against Amazon rather than remembered — where we have no verified figure the button says so.
| # | Product | Best for | Renter | Price |
|---|---|---|---|---|
| 1 |  H2Option Two-Piece Dual Flush Chair Height Elongated Toilet with Seat and Wax Ring 0.92 gpf light and 1.28 gpf full, a published MaP score of 1,000 grams, chair height, and the seat and wax ring in the box. | Real water savings with a published performance score | Owner-only | |
| 2 | No photo yet Studio Skirted Two-Piece Dual Flush Chair Height Elongated Toilet with Seat 1.0 gpf light and 1.28 gpf full, a skirted base over a 2-1/8 in. glazed trapway, and a warranty spelled out on the page. | Smooth sides that wipe down in one pass | Owner-only | |
| 3 |  Veil One-Piece Compact Elongated Smart Toilet, Dual-Flush The lowest light flush here at 0.8 gpf, on a tankless smart toilet with a built-in bidet — and a dedicated circuit to match. | Anyone buying a bidet toilet anyway | Owner-only | |
| — |  Leap One-Piece Elongated Smart Toilet, Dual-Flush A smart toilet whose 1.0 gpf light flush saves less than the Veil's 0.8 or the H2Option's 0.92, for the cost of a dedicated circuit. | Skip this one | Owner-only | No buy link |
The light flush is the number that matters
Every toilet on this page has a 1.28 gpf full flush, which is the WaterSense ceiling most new toilets now meet anyway. The difference is the light flush, and the makers publish 0.8, 0.92 and 1.0 gpf.
Here is what that is worth, with our assumptions shown. Say one person uses the light flush four times a day, against a single-flush 1.28 gpf toilet:
- 0.8 gpf (Veil): 0.48 gal saved a flush, about 700 gallons a year.
- 0.92 gpf (H2Option): 0.36 gal saved a flush, about 525 gallons a year.
- 1.0 gpf (Studio, Leap): 0.28 gal saved a flush, about 410 gallons a year.
Multiply by the people in your house. The four-a-day figure is our example, not a published one, and the saving only happens if people actually press the small button.
MaP: the one performance score, and who publishes it
MaP testing measures how many grams of test media a toilet clears in a single flush. It is the closest thing the industry has to an independent flush-performance number, and of the toilets here only the H2Option publishes one: 1,000 grams.
We will not rank the others on flushing without a number. A dual-flush toilet that saves water but needs flushing twice saves nothing, and without a published score there is no honest way to say which is which.
Gravity or pumped
The two American Standard models are conventional tank toilets. The two Kohler smart toilets are not: the Veil is pump-assisted and the Leap lists a power flush, and both need electricity to work normally.
Both publish an emergency flush for up to 100 flushes during a power outage. It is worth knowing that the plain tank toilets need no such plan at all.
One-piece or two-piece
Both American Standard picks are two-piece. The Kohler smart toilets are one-piece. If a one-piece matters more to you than the lowest light flush, the one-piece picks are here — though those are single-flush 1.28 gpf models. One-piece against two-piece is covered here.
If you rent
Every toilet here rates Owner-only on our install rating. If saving water is the goal in a rental, the shower is where you can do it without asking anyone: the water-saving shower heads are here.
Every pick in full
3 we would buy, and one we would not. Each carries its Renter-Safe Install Rating, the published specs behind it, and the honest gap in what we know.
1. Best overall
H2Option Two-Piece Dual Flush Chair Height Elongated Toilet with Seat and Wax Ring
American Standard · 606AA002.020 · best for real water savings with a published performance score
0.92 gpf light and 1.28 gpf full, a published MaP score of 1,000 grams, chair height, and the seat and wax ring in the box.
The American Standard H2Option wins on the two numbers that matter here. Its light flush is 0.92 gpf, lower than any conventional toilet we cover, and it is the only toilet on this page with a published MaP score: “1,000 grams”.
The bowl is chair-height elongated at “16 1/2-in. high”, with a chrome push-button on the tank lid. American Standard ships “Slow-close seat, chrome push-button actuator, color-matched bolt caps, and wax ring” in the box, which is most of what you need on install day.
As a two-piece, it has the tank-to-bowl gap that one-piece toilets avoid. American Standard addresses that directly with a “Sanitary bar on bowl eliminates accumulation between bowl and tank”, and adds its EverClean surface and PowerWash rim.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: A full toilet replacement on the property's drainage. The wax ring and seat come in the box, which helps an owner and changes nothing for a tenant.
Read from published documentation, not from fitting one. American Standard — H2Option dual flush chair height elongated toilet, published flush volumes, MaP and contents. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
A two-piece, so there is still a tank-to-bowl joint, even with the sanitary bar.
What we can’t tell you
The product page publishes neither the rough-in nor the warranty, and white was listed as sold out or unavailable when we checked.
Published specifications
| Flush | Dual: 1.28 gpf / 4.8 Lpf full, 0.92 gpf / 3.5 Lpf light |
|---|---|
| MaP rating | “1,000 grams” |
| Water efficiency | WaterSense certified |
| Bowl | Elongated, chair height, “16 1/2-in. high” |
| Actuator | Chrome push-button on the tank lid |
| Included | “Slow-close seat, chrome push-button actuator, color-matched bolt caps, and wax ring” |
| Surface | “EverClean® antimicrobial surface”; “PowerWash® rim” |
| Rough-in | Not published on the product page |
| Warranty | Not published on the product page |
| Availability | White listed as sold out or unavailable on American Standard's store at the time of writing |
#ad Price $419.09 as of October 18, 2026. Prices change; Amazon’s listing is the one that counts. How we’re funded.
2. Best skirted
Studio Skirted Two-Piece Dual Flush Chair Height Elongated Toilet with Seat
American Standard · 2794203.020 · best for smooth sides that wipe down in one pass
1.0 gpf light and 1.28 gpf full, a skirted base over a 2-1/8 in. glazed trapway, and a warranty spelled out on the page.
The American Standard Studio skirted is the dual-flush for people who hate cleaning around a toilet. The base is skirted over a “concealed trapway”, so the sides are flat, and the trapway itself is a “2-1/8 in” fully glazed passage.
Its light flush is 1.0 gpf against a 1.28 gpf full flush. American Standard includes the “Wax ring, bolts, bolt caps, and EZ Install tool kit” plus the seat, and it publishes the warranty in full: “Limited Lifetime Warranty on Chinaware; 5-Year Warranty on Mechanical Parts; 1-Year Warranty on Seat”.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- None
- Reversible on move-out
- No
Why: A toilet replacement on the property's drainage. American Standard ships the install kit in the box; it is still an owner's job.
Read from published documentation, not from fitting one. American Standard — Studio skirted dual flush chair height elongated toilet, published flush volumes, trapway and warranty. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
Its 1.0 gpf light flush uses more water than the H2Option's 0.92.
What we can’t tell you
No MaP score and no WaterSense statement on the product page, and it was out of stock on American Standard's store when we checked.
Published specifications
| Flush | Dual: 1.28 gpf (4.8 Lpf) full, 1.0 gpf (3.8 Lpf) light |
|---|---|
| Design | Skirted two-piece with a “concealed trapway” |
| Trapway | “2-1/8 in”, “fully glazed trapway” |
| Bowl | Elongated, chair height |
| Rough-in | 12 in., per American Standard's 12-inch rough tank listing |
| Included | “Wax ring, bolts, bolt caps, and EZ Install tool kit”, plus the seat |
| Warranty | “Limited Lifetime Warranty on Chinaware; 5-Year Warranty on Mechanical Parts; 1-Year Warranty on Seat” |
| MaP rating | Not published on the product page |
| WaterSense | Not stated on the product page |
| Availability | Out of stock on American Standard's store at the time of writing |
#ad We have no verified live price for this one right now, so we are not showing a number. How we’re funded.
3. Best smart dual-flush
Veil One-Piece Compact Elongated Smart Toilet, Dual-Flush
Kohler · K-5401-PA · best for anyone buying a bidet toilet anyway
The lowest light flush here at 0.8 gpf, on a tankless smart toilet with a built-in bidet — and a dedicated circuit to match.
The Kohler Veil publishes the lowest light flush on this page: “Dual flush offers a choice of 0.8 or 1.28 gpf”, with pump-assisted flushing.
It is a smart toilet first. There is a stainless steel cleansing wand, a heated seat, a warm-air dryer, automatic deodorization and a motion-activated lid, and it needs “One dedicated circuit required, protected with Class A Ground-Fault Circuit-Interrupter (GFCI)” plus a minimum supply flow of 6 gpm.
An emergency flush “supports up to 100 flushes during power outage”, which answers the obvious question about a toilet that needs electricity.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- Dedicated GFCI circuit (120 V, 15 A)
- Reversible on move-out
- No
Why: A toilet replacement plus a dedicated, GFCI-protected circuit beside the toilet, which most bathrooms do not have. Plumber and electrician.
Read from published documentation, not from fitting one. Kohler — Veil K-5401-PA specification sheet. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
A dedicated GFCI circuit and a 6 gpm supply requirement. This is a smart-toilet purchase first and a water-saving one second.
What we can’t tell you
Kohler publishes no MaP score for it.
Published specifications
| Type | One-piece smart toilet “with integrated personal cleansing”; tankless, direct water supply |
|---|---|
| Flush | “Dual flush offers a choice of 0.8 or 1.28 gpf”; pump-assisted |
| Supply requirement | Minimum flow rate 6 gpm (22.7 lpm) |
| Cleansing | Stainless steel wand with adjustable spray shape, position, pressure, temperature, pulsate and oscillate; front and rear warm-water wash |
| Self-cleaning | UV light and electrolyzed water clean the wand surfaces |
| Comfort | Heated seat and warm-air dryer, both adjustable; automatic deodorization; bowl nightlight |
| Lid | Motion-activated, hands-free opening and closing |
| Power outage | “Emergency flush supports up to 100 flushes during power outage” |
| Electrical | “One dedicated circuit required, protected with Class A Ground-Fault Circuit-Interrupter (GFCI)” — 120 V, 15 A |
| Rough-in | 12 in. |
| Footprint | 26-1/8 in. deep, 17-1/4 in. wide on Kohler's drawing |
| Water surface | 7-15/16 in. x 5-5/8 in.; trapway 1-15/16 in. |
| Warranty | “KOHLER Intelligent Toilet and C3 Cleansing Seat Three-Year Limited Warranty” |
#ad Price $5,999.96 as of October 18, 2026. Prices change; Amazon’s listing is the one that counts. How we’re funded.
The one to skip
Leap One-Piece Elongated Smart Toilet, Dual-Flush
Kohler · K-28529 · best for only if its compact, transfer-friendly design is the reason
A smart toilet whose 1.0 gpf light flush saves less than the Veil's 0.8 or the H2Option's 0.92, for the cost of a dedicated circuit.
On a page about saving water, the Kohler Leap has the least to offer.
Its light flush is 1.0 gpf — Kohler’s wording is “Dual-flush offers a choice of 1.0 or 1.28 gpf” — and like the Veil it needs a dedicated, GFCI-protected 15-amp circuit. If you are going to take on that wiring for a smart toilet, the Veil’s 0.8 gpf light flush is lower.
The Leap’s real strengths are elsewhere: a 14-1/2 in. wide footprint on Kohler’s drawing, a fully skirted trapway, and a design Kohler says supports “easier transfers from wheelchair”. If those are your reasons, it is covered here.
Renter-Safe Install Rating
- Drilling
- None
- Tools
- Not published
- Time to fit
- Not published
- Power
- Dedicated GFCI circuit (120 V, 15 A)
- Reversible on move-out
- No
Why: A toilet replacement that also needs its own GFCI-protected circuit within 35 inches of cord. Owner's work, with an electrician.
Read from published documentation, not from fitting one. Kohler — Leap K-28529 specification sheet. How the verdict is derived: renter-safe ratings explained.
What’s wrong with it
The highest light flush among the smart toilets, plus a dedicated circuit.
What we can’t tell you
No MaP score published.
Published specifications
| Type | One-piece smart toilet “with integrated personal cleansing”; fully skirted trapway |
|---|---|
| Flush | “Dual-flush offers a choice of 1.0 or 1.28 gpf”; power flush, automatic after every use |
| Cleansing | Stainless steel wand with adjustable spray shape, position, pressure, temperature, pulsate and oscillate |
| Self-cleaning | UV light cleans the wand surfaces |
| Comfort | Heated seat, warm-air drying, automatic deodorization, handheld remote |
| Lid | Motion-activated, hands-free opening and closing |
| Accessibility | Comfort Height; “Designed to support easier transfers from wheelchair” |
| Power outage | “Emergency flush supports up to 100 flushes during power outage” |
| Electrical | “One dedicated circuit required, protected with Class A Ground-Fault Circuit-Interrupter (GFCI)” — 120 V, 15 A; 35 in. cord |
| Rough-in | 12 in. |
| Footprint | 27-9/16 in. deep, 14-1/2 in. wide on Kohler's drawing |
| Trapway | 2 in.; rim to water surface 5-3/4 in. |
| Warranty | “KOHLER Intelligent Toilet and C3 Cleansing Seat Three-Year Limited Warranty” |
There is no buy button on this one. It is easy enough to find if you want it anyway — we would rather point you at something that is still on the wall in a year.
Where to buy
Everything recommended on this page, in one place. Each link is an Amazon Associates link — we earn a commission at no extra cost to you, and it never decides a pick.
- $419.09View on Amazon
H2Option Two-Piece Dual Flush Chair Height Elongated Toilet with Seat and Wax Ring
American Standard · 606AA002.020 · Renter verdict: Owner-only
- Check price on Amazon
Studio Skirted Two-Piece Dual Flush Chair Height Elongated Toilet with Seat
American Standard · 2794203.020 · Renter verdict: Owner-only
- $5,999.96View on Amazon
Veil One-Piece Compact Elongated Smart Toilet, Dual-Flush
Kohler · K-5401-PA · Renter verdict: Owner-only
#ad Prices are not shown because we only publish figures we have verified on the day. How we’re funded.
Questions people actually ask
are dual flush toilets worth it
If people use the light flush, yes. Against a 1.28 gpf single-flush toilet, the H2Option's 0.92 gpf light flush saves 0.36 gallons each time — about 525 gallons a year for one person using it four times a day.
how much water does a dual flush toilet use
All the toilets here use 1.28 gpf on the full flush. The light flush is 0.8 gpf on the Kohler Veil, 0.92 gpf on the American Standard H2Option, and 1.0 gpf on the Studio skirted and the Kohler Leap.
what is a map score for a toilet
A flush-performance test result: the grams of test media a toilet clears in one flush. American Standard publishes 1,000 grams for the H2Option. None of the other toilets here publishes one.
do dual flush toilets work without power
Conventional tank models like the American Standard picks need no power at all. Kohler's Veil and Leap smart toilets publish an emergency flush for up to 100 flushes during a power outage.
Sources
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