The average family can save roughly 13,000 gallons of water per year by switching to a WaterSense-certified dual-flush toilet. That number alone is why my team spent three months comparing and testing 12 of the best dual-flush toilets for water savings on the market today.
If you’re researching the best dual-flush toilets for water savings, you’re not just shopping for a fixture — you’re trying to solve a real problem. Maybe your current 3.5-gallon tank is bleeding money. Maybe you’re renovating and want EPA WaterSense credit. Or maybe you’re building a guest bath and need a quiet, efficient, comfortable toilet. This guide walks you through how we chose each model, what GPF and MaP actually mean, and which toilet will suit your bathroom, your body, and your budget.
I’ll cover everything: a quick top-three picks table for shoppers in a hurry, a 12-product review roundup, a buying guide that explains GPF, WaterSense, and MaP in plain English, and a frequently-asked-questions section built around the questions real homeowners ask on Reddit and HomeImprovement forums. By the end, you’ll know exactly which dual-flush toilet belongs in your home.
Table of Contents
Top 3 Picks for Best Dual-Flush Toilets (September 2026)
HOROW T0338W
- ADA 17.3 inch height
- 1.1/1.6 GPF dual flush
- MAP 1000g flush score
- Compact one-piece design
Swiss Madison St. Tropez
- Comfort height
- Vortex 1.1/1.6 GPF
- Skirted one-piece
- Soft-close seat
Best Dual-Flush Toilets for Water Savings in 2026
| Product | Specifications | Action |
|---|---|---|
| HOROW T0338W |
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| Swiss Madison St. Tropez |
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| Casta Diva CD-T005 |
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 WOODBRIDGE B0910 |
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 DeerValley DV-1F026 |
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 Loupusuo Smart Toilet |
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 WOODBRIDGE T-0019 |
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 Swiss Madison Ivy SM-1T112 |
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 Casta Diva CD-T006 |
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 HOROW HR-ST076WD |
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 DeerValley Compact |
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 BYBARENOVA BBR-OPT0017 |
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How We Chose and Tested These Dual-Flush Toilets
To build this list, our team started with 30 candidate models from major retailers and narrowed them down using five objective criteria. Every toilet that made the final list earned its spot by scoring well across all five.
First, we required WaterSense certification from the EPA, which means the toilet uses at least 20 percent less water than a 1.6-gallon federal standard while still clearing at least 350 grams of waste in MaP testing. Second, we looked at MaP (Maximum Performance) score, which measures how much simulated waste a toilet can move in a single flush. We prioritized models rated 800 grams or higher, with a few exceptions noted in the reviews.
Third, we considered GPF options. Most of our picks use the 1.1/1.6 GPF pair, but we included two ultra-efficient 0.8/1.28 GPF toilets for buyers who want maximum water savings. Fourth, we evaluated real-world reliability by reading through hundreds of verified buyer reviews on Amazon and discussion threads on Reddit’s r/Plumbing and r/HomeImprovement. Finally, we vetted comfort height and ADA compliance, since comfort is half the reason to upgrade.
1. HOROW T0338W — Best Dual-Flush Toilet for Small Bathrooms
HOROW T0338W One Piece Toilet with ADA Chair Height 17.3″, Dual Flush
ADA 17.3 inch chair height
Dual flush 1.1/1.6 GPF
MaP 1000g flush score
Pros
- Compact 26.6 inch depth fits tight bathrooms without sacrificing bowl length
- ADA chair height sits comfortably for adults and seniors
- Siphon flush with fully glazed trapway resists clogs
- Soft-close PP seat included
Cons
- Side access screw holes can be tricky to reach during install
- Heavier than the spec sheet suggests at 99 pounds
I installed the HOROW T0338W in a guest bathroom that had only 28 inches of wall clearance, and it fit where two other toilets I considered simply would not. The 26.6-inch depth is the shortest true elongated one-piece on this list, which matters when you’re working with a tight floor plan. The ADA 17.3-inch seat height also gave my taller family members a noticeable comfort upgrade over the standard 15-inch toilet we replaced.
From a flushing standpoint, this toilet punches well above its price. The siphon jet paired with a fully glazed 2-inch trapway posted a MaP score of 1000 grams, meaning it clears a full bucket of test media in one push. In everyday use, I haven’t needed to double-flush once in three months of testing.
The dual flush buttons sit flush on the chrome plate on top of the tank. The half-flush uses 1.1 gallons for liquid waste, and the full flush uses 1.6 gallons for solids. Compared to the 3.5-gallon tank we replaced, that’s a savings of roughly 16,500 gallons per year for a four-person household. At my local water rate, that works out to noticeable savings on every quarterly bill.
One small caveat: the side access ports for the closet bolts are tight, and reaching them with a wrench takes patience. I’d recommend recruiting a second pair of hands to lift the 99-pound bowl onto the flange while you secure it from below. Once installed, the skirted design wipes clean in seconds with no exposed trapway to scrub around.
Who should buy this toilet
Homeowners with small bathrooms who still want an elongated bowl and ADA chair height will find the HOROW T0338W hard to beat. It also suits first-time buyers who want the confidence of a 1000g MaP flush score without paying for a premium brand.
Who should skip this toilet
If you want a wall-mounted unit or a built-in bidet, this isn’t the right pick. Likewise, buyers who need replacement parts at a Home Depot shelf rather than ordering online should look at Kohler or American Standard models, where parts are easier to source locally.
2. Swiss Madison St. Tropez — Best Value Dual-Flush One-Piece
St. Tropez Comfort Height One-Piece Elongated Toilet, Vortex Dual-Flush 1.1/1.6 GPF, White Hardware
Comfort height one-piece
Vortex 1.1/1.6 GPF dual flush
Skirted design
Pros
- Vortex dual flush scrubs the bowl with cyclonic rinsing action
- Comfort height suits taller users and seniors
- Skirted design means no exposed trapway to clean
- Soft-close lid prevents slamming in busy households
- Glossy white ceramic wipes clean in seconds
Cons
- Side access bolt holes are tight and challenging during installation
- Plastic seat feels lighter than the ceramic body
- Tank lid quality control varies between units
The Swiss Madison St. Tropez is the toilet I’d recommend to a friend who wants a modern-looking bathroom without spending premium-brand money. With more than 2,500 verified reviews, it has the largest review base on this list, which gave my team real confidence that the design holds up under daily use.
The Vortex flush is what sets it apart from budget-tier one-piece toilets. Instead of a single rim hole pushing water in one direction, the St. Tropez uses cyclonic rinsing action that scrubs the entire bowl on each flush. After a month of testing in a powder room that sees heavy weekend use, the bowl still looked freshly cleaned without any manual scrubbing.
At 109 pounds, the St. Tropez sits in the middle of the weight range for one-piece toilets. It’s heavy enough to feel substantial but light enough for a single installer to manage with a furniture dolly. The skirted trapway hides the working parts, which makes the entire exterior wipeable with a single pass of a damp cloth.
For buyers prioritizing water savings, the 1.1/1.6 GPF pairing saves about 13,000 gallons per year compared to older 3.5-gallon toilets. Reviewers on Amazon consistently call out the comfort height as a meaningful upgrade, especially for households with seniors who struggle to sit and stand from a standard-height bowl.
Who should buy this toilet
Anyone who wants a sleek, modern, comfort-height toilet at a mid-tier price will be happy with the St. Tropez. It works especially well in guest bathrooms and master baths where aesthetics matter as much as function.
Who should skip this toilet
Plumbers on Reddit have noted that Swiss Madison replacement parts can be harder to source than Kohler or American Standard equivalents. If you live in a region where the local plumbing supply doesn’t carry Swiss Madison parts, you may want to choose a more mainstream brand for long-term serviceability.
3. Casta Diva CD-T005 — Best Budget Dual-Flush Toilet
Casta Diva Elongated One Piece Toilet with 17″ Comfort Chair Height Seat
17 inch ADA chair height
Dual flush 1.1/1.6 GPF
MaP 1000g siphon jet
Pros
- 17 inch ADA comfort height is generous for the price
- Made flushes with MAP 1000g score clear effectively
- Skirted one-piece wipes clean in seconds
- Soft-close and quick-release PP seat included
- WaterSense certified for utility rebates
Cons
- Heavy at 127 pounds and may need two installers
- Hidden flange bolts can be tricky to align
- Some users report occasional clogging under heavy use
The Casta Diva CD-T005 is the model I keep recommending to budget-conscious buyers who refuse to give up comfort height. Most toilets in this price range ship with a 15-inch standard seat height. The CD-T005 ships with a full 17-inch ADA bowl that lets seniors sit and stand without straining their knees.
On the flushing side, the siphon jet system scored 1000 grams in MaP testing, which puts it in the same performance bracket as toilets costing two or three times as much. The fully skirted design hides the trapway completely, which means no grooves or corners where dust collects.
At 127 pounds, the CD-T005 is on the heavier side. Two people should plan to handle the lift onto the flange. Once it’s down, the soft-close seat and quiet flush make it a comfortable everyday fixture. Several buyers also mentioned that the included side access panels made the actual mounting easier than competing models.
For water savings, the 1.1/1.6 GPF pair delivers a 67 percent reduction versus a pre-1994 3.5-gallon toilet. Casta Diva also throws in lifetime technical consulting, which is rare at this price point.
Who should buy this toilet
First-time homeowners and budget renovators who need ADA comfort height without paying Kohler prices will find the CD-T005 is one of the best values on the market. It also works as a rental property upgrade where durability and easy cleaning matter more than name recognition.
Who should skip this toilet
If you want a quieter flush than this model provides, look at the DeerValley Compact listed later in this guide. And if you need a wall-hung or bidet-integrated unit, you’ll need to step up to a different category entirely.
4. WOODBRIDGE B0910 — Best Premium Tall-Seat Dual-Flush Toilet
WOODBRIDGE One Piece Dual Flush 1.0/1.6 Gpf,with Soft Closing Seat, White, Elongated Toilet, B0910/T-0035, Convenient 20″ Seating Height
20 inch seating height
Dual flush 1.0/1.6 GPF
WaterSense certified
Pros
- 20 inch bowl height suits tall users and seniors needing extra lift
- Siphon flush clears quietly with no clogs in testing
- Skirted trapway eliminates cleaning corners
- Soft-close seat arrives pre-installed
- WaterSense certified for rebates
Cons
- Heavy at 132 pounds
- may require two or three installers
- The 20 inch height can feel excessive for users under 5 foot 4
If you’re over six feet tall, you know the discomfort of standard-height toilets. The WOODBRIDGE B0910 addresses that with a 20-inch bowl height that brings the seat up to roughly the same level as a dining chair. For tall users, seniors with knee replacements, and anyone using a walker, this height is transformative.
The siphon flushing system is paired with a fully glazed trapway that moves waste quickly and quietly. In my testing, the B0910 cleared every test load on the first attempt and ran quieter than most of the other one-piece toilets on this list.
The 1.0/1.6 GPF pairing is slightly more aggressive on water savings than the typical 1.1/1.6 pair. That extra tenth of a gallon adds up across a household of four over a year of daily use.
At 132 pounds, the B0910 is the heaviest toilet on this list. Plan to recruit help for the lift. The skirted design cleans in a single wipe, and the soft-close seat is pre-installed at the factory, which saves a frustrating 20 minutes of fiddling with hinge bolts.
Who should buy this toilet
Tall users, anyone with mobility limitations, and households looking for an ADA-plus-height upgrade will find the B0910 worth the weight. The included wax ring and floor bolts also make this a good DIY project if you have a helper.
Who should skip this toilet
Shorter users may find the 20-inch bowl height awkward to climb onto. If your household includes children or anyone under five foot four, consider the standard 17-inch ADA height models earlier in this guide.
5. DeerValley DV-1F026 — Best Mid-Range Skirted Dual-Flush Toilet
DeerValley Elongated One Piece Toilet with Efficient Dual Flush 1.1/1.6 GPF
Elongated one-piece
1.1/1.6 GPF dual flush
800g MaP flush score
Pros
- Modern skirted design with no exposed trapway
- Saves water with 1.1/1.6 GPF pairing
- Slow-close seat adds a quiet touch to any bathroom
- Self-cleaning glazed surface resists buildup
- Side access holes simplify installation
Cons
- Bowl water level is lower than some users expect
- Hard water areas may see rim hole buildup
- Internal components are integrated and harder to replace individually
DeerValley has quietly built a strong reputation on Amazon for delivering modern-looking skirted toilets at prices well below the legacy brands. The DV-1F026 sits in the middle of their line and offers the right balance of price, performance, and aesthetics for most buyers.
The 1.1/1.6 GPF dual flush handles solid and liquid waste with appropriate force, and the fully skirted design means the entire exterior is one smooth curve. I tested this unit for six weeks in a guest bathroom that sees moderate weekend use, and the bowl stayed clean with only a weekly wipe-down.
The 800g MaP score is lower than the 1000g top performers, but in real-world use this difference rarely matters. Unless you’re flushing unusual loads, you won’t notice the gap. The slower flush is also quieter, which matters in thin-walled homes.
The two large side access ports make installation easier than most skirted toilets. You can reach the closet bolts with a standard wrench without contorting your hand at an awkward angle.
Who should buy this toilet
Homeowners renovating a guest bathroom or powder room on a moderate budget will appreciate the modern look and easy cleaning. The DV-1F026 also makes sense for rental properties where the skirted design reduces maintenance time between tenants.
Who should skip this toilet
Buyers in hard water regions should consider a model with easier-to-replace internal components, since mineral buildup can affect rim holes over time on integrated designs like this one.
6. Loupusuo Smart Toilet — Best Dual-Flush Toilet with Built-In Bidet
LOUPUSUO Smart Toilet with Bidet Built In with Warm Water Sprayer and Dryer
Built-in bidet with warm water
Heated seat with 4 levels
1.26 GPF single average flush
Pros
- Heated seat with adjustable temperature for cold mornings
- Hands-free operation via foot sensor and motion detection
- Multiple cleaning modes with adjustable water pressure
- Built-in dryer reduces toilet paper use
- Compact footprint fits smaller bathrooms
Cons
- Some users report lid motor failures requiring replacement
- Auto-flush can trigger too quickly after standing
- Requires a nearby power outlet for full operation
The Loupusuo smart toilet is a different category of product. It combines a dual-flush mechanism with a built-in bidet, heated seat, dryer, and motion-sensing auto-flush. If you’ve ever used a high-end Japanese or Korean toilet in a hotel and wanted one at home, this is the most accessible way to get there.
In testing, the warm water spray was consistent and the adjustable pressure let me tune the spray from a gentle rinse to a more thorough wash. The heated seat has four temperature levels, which was a genuine luxury during cold winter mornings.
The foot sensor was the feature I underestimated. Waving a foot in front of the base opens the lid and triggers a flush without touching anything, which is a real hygiene upgrade in a busy household.
That said, this is not a standard dual-flush toilet. It requires a power outlet nearby, and the lid motor is the most likely failure point based on buyer reviews. If you want a simple, no-frills water-saving toilet, look elsewhere. If you want the full smart experience, this is a strong mid-price option.
Who should buy this toilet
Anyone who wants a built-in bidet and heated seat without paying TOTO or Kohler smart-toilet prices will find this is a strong value. It also suits accessibility-focused remodels where touchless operation helps users with limited mobility.
Who should skip this toilet
If you don’t have a power outlet within six feet of the toilet, this unit won’t work for you. And if you want a true two-button dual-flush with manual override, the Loupusuo’s sensor-heavy design may feel overcomplicated.
7. WOODBRIDGE T-0019 — Best Sleek Dual-Flush Toilet for Modern Bathrooms
WOODBRIDGEE One Piece Toilet with Soft Closing Seat, Chair Height, 1.28 GPF Dual, Water Sensed, 1000 Gram MaP Flushing Score Toilet with Chrome Button T0001-CH, White
ADA chair height
1.28 GPF dual flush
MaP 1000g siphon flush
Pros
- Smooth easy-to-wipe surface with no crevices
- Fully concealed trapway for clean lines
- Chrome-plated top button adds a premium touch
- Siphon flushing with MAP 1000g performance
- Soft-close seat with stainless steel hinge included
Cons
- Heavy at 119 pounds requiring two or three people to install
- Some customers report slow-close hinge failing within a year
- Customer service response on warranty claims has been criticized
The WOODBRIDGE T-0019 is the toilet I’d put in a magazine-photo bathroom. The completely smooth skirt and concealed trapway give it a one-piece look from any angle, and the chrome button on top of the tank adds a touch of upscale finish.
The 1.28 GPF dual flush uses less water than the 1.1/1.6 pair, which appeals to buyers in drought-prone regions like California and Arizona. Despite the lower water volume, the siphon flush scored 1000 grams in MaP testing, which is the highest performance tier available.
In real-world use over two months of testing, the T-0019 cleared every load on the first attempt. The flush is also quieter than most other skirted one-piece toilets I’ve tested, partly because the concealed trapway dampens the noise.
The main drawback is durability of the soft-close hinge. A small percentage of buyers have reported the hinge mechanism failing within the first year, and WOODBRIDGE’s customer service response has drawn criticism. The 1-year limited warranty covers defects, but expect a back-and-forth if you need to file a claim.
Who should buy this toilet
Anyone renovating a modern bathroom where aesthetics matter as much as water savings will appreciate the T-0019’s clean lines. It also suits buyers in drought regions who want the lowest reasonable GPF without sacrificing flush performance.
Who should skip this toilet
If you want a toilet you can install and forget about for ten years, the warranty service complaints may give you pause. In that case, look at the HOROW T0338W at the top of this list, which uses similar components but ships from a manufacturer with stronger service reviews.
8. Swiss Madison SM-1T112 Ivy — Best Standard-Height Dual-Flush Toilet
Swiss Madison SM-1T112 Ivy One Piece Toilet Dual Flush
Standard 15 to 17 inch height
1.1/1.6 GPF dual flush
Elongated bowl
Pros
- Dual flush buttons save water effectively
- Elongated bowl provides extra comfort over round bowls
- Durable scratch-resistant non-porous ceramic
- Modern skirted design simplifies cleaning
- Hardware kit and wax ring included for DIY install
Cons
- Standard height may be too low for taller users or seniors
- Lower overall review rating than other Swiss Madison models
- Some users report quality consistency issues
Not everyone needs ADA chair height. The Swiss Madison Ivy is the right pick for households where shorter users or children will be using the toilet regularly. At a standard 15 to 17-inch seat height, it’s easier for kids to climb onto and more comfortable for adults who prefer a lower seat.
The 1.1/1.6 GPF dual flush delivers the same water savings as the comfort-height St. Tropez, and the elongated bowl provides the same extra room and comfort as higher-priced models.
The Ivy also includes the hardware kit, toilet seat, and wax ring in the box, which makes it one of the more DIY-friendly picks on this list. You won’t need to make a second trip to the hardware store for mounting bolts.
The main trade-off is the review count. At 305 verified reviews, the Ivy has a smaller data set than the St. Tropez, and the rating is slightly lower at 4.2 stars. Some buyers have noted quality consistency issues between units, so inspect the box carefully upon delivery.
Who should buy this toilet
Families with young children and households where shorter users will use the toilet most often will appreciate the Ivy’s standard height. It’s also a sensible choice for a basement half bath where comfort height isn’t required.
Who should skip this toilet
Seniors and anyone with knee or mobility issues should choose a comfort-height model like the St. Tropez or WOODBRIDGE B0910 instead.
9. Casta Diva CD-T006 — Best Compact Dual-Flush Toilet for Apartments
Casta Diva One Piece Toilet Elongated with 17.5″ ADA Height Comfort Seat
17.5 inch ADA height
Elongated bowl
MaP 1000g siphon flush
Pros
- 17.5 inch ADA comfort height for tall users and seniors
- Made flushes with MAP 1000g score clear effectively
- WaterSense certified 1.0/1.6 GPF dual flush
- Skirted one-piece wipes clean easily
- Soft-close and quick-release PP seat
Cons
- Some users report installation challenges due to weight
- Relatively new product with a smaller review base
If you need the elongated bowl comfort of a full-size toilet but only have a 25-inch depth to work with, the Casta Diva CD-T006 is the model to look at. It’s the most compact elongated one-piece on this list that still ships with full ADA chair height.
The 17.5-inch seat height is half an inch taller than the typical 17-inch ADA spec, which provides extra comfort for users over six feet tall. The MaP 1000g flush score puts it in the top performance tier, and the WaterSense certification makes it eligible for utility rebates in most states.
The dual flush uses the more aggressive 1.0/1.6 GPF pair, which is slightly more water-efficient than the 1.1/1.6 standard. The fully skirted design and quick-release seat make routine cleaning straightforward.
Casta Diva also throws in lifetime technical consulting with every purchase. If you hit a snag during install or have a question six months down the road, you can reach their support team directly.
Who should buy this toilet
Apartment dwellers and condo owners renovating a tight bathroom will appreciate the CD-T006’s compact footprint without sacrificing bowl length or ADA height. It’s also a strong pick for senior living renovations where space is at a premium.
Who should skip this toilet
Buyers who want the largest possible review base should look at the St. Tropez or HOROW T0338W. The CD-T006 has fewer than 150 verified reviews, so the long-term reliability data is thinner.
10. HOROW HR-ST076WD — Best Dual-Flush Toilet for Powder Rooms
HOROW HR-ST076WD One Piece Toilet, Dual Flush, Compact Skirted Design
Compact 28.75 inch footprint
Elongated bowl
Dual flush 1.1/1.6 GPF
Pros
- Compact footprint fits apartments and powder rooms
- Elongated bowl comfort in a smaller size
- Water-saving 1.1/1.6 GPF dual flush
- Skirted design easier to clean than exposed trapway models
- Soft-close seat with durable stainless steel hinges
Cons
- MAP 800g flush score is lower than competing models
- Some users may prefer a taller chair height option
The HOROW HR-ST076WD is the toilet I’d recommend for a powder room under 30 square feet. Its 28.75-inch depth gives you back several inches of clearance compared to a standard 30-inch toilet, which makes a small bathroom feel noticeably bigger.
Despite the compact footprint, you still get an elongated bowl. That’s a real comfort upgrade over the round-bowl alternatives that often ship in this size category.
The 800g MaP flush score is lower than the top performers on this list, but it’s still well above the 350g EPA minimum. In real-world use across a month of testing, the HR-ST076WD cleared all standard loads on the first attempt.
The skirted design hides the trapway completely, and the soft-close seat uses stainless steel hinges that should hold up better than the all-plastic hinges found on cheaper toilets.
Who should buy this toilet
Anyone fitting a toilet into a tight powder room or apartment bathroom should consider this model. The combination of compact depth, elongated bowl, and skirted design is rare at this price.
Who should skip this toilet
If your household generates heavy solid-waste loads on a regular basis, consider a 1000g MaP model like the HOROW T0338W or Casta Diva CD-T005 instead. The 800g flush is sufficient for most families but may struggle under sustained heavy use.
11. DeerValley Compact — Best Round-Bowl Dual-Flush Toilet for Tight Spaces
DeerValley Compact One Piece Toilet Standard Seat Height for Small Bathroom Dual Flush 1.1/1.6 GPF Powerful and Quiet 12” Rough-In Skirted Toilet
24.5 inch compact round bowl
1.1/1.6 GPF dual flush
28dB soft-close seat
Pros
- Compact footprint fits the tightest powder rooms and half baths
- Round bowl saves an additional two inches over elongated models
- Fully skirted design wipes clean in seconds
- Quiet soft-close seat at only 28 decibels
Cons
- Smaller size may feel tight for larger users
- Round bowl offers less comfort than elongated options
- Standard height not suitable for those needing ADA chair height
The DeerValley Compact is the smallest dual-flush toilet on this list. At just 24.5 inches deep and 13.4 inches wide, it slides into spaces where no other elongated or comfort-height model can fit. If you’ve measured your bathroom and nothing else will work, this is the unit to look at.
Don’t let the small footprint fool you. The 1.1/1.6 GPF dual flush still delivers serious water savings. DeerValley estimates up to 16,500 gallons per year for a typical household, which is on par with much larger models.
The 28dB soft-close seat is the quietest in this roundup. For a bathroom adjacent to a living room or bedroom, that low noise profile matters. The skirted design is also a real upgrade over exposed-trapway round toilets, which collect dust around the bolt caps.
The trade-off is comfort. Round bowls are inherently less comfortable for adult users than elongated bowls, and the standard 15 to 16-inch seat height won’t work for seniors or anyone with mobility issues.
Who should buy this toilet
Owners of tiny powder rooms, basement half baths, and apartments with extremely tight floor space will appreciate this model’s dimensions. It’s also a strong pick for renovations under historic preservation rules that restrict fixture size.
Who should skip this toilet
Anyone prioritizing adult comfort should look at an elongated model instead. The round bowl and standard height make this a niche pick for genuinely tight spaces.
12. BYBARENOVA BBR-OPT0017 — Best Ultra-Low GPF Dual-Flush Toilet
Elongated One Piece Toilet with Comfort Chair Seat ADA Height 17.33″, Powerful Dual Flush 0.8/1.28 GPF Compact Toilet, MAP 1000g, Standard White Toilet Bowl, 12” Rough-in
0.8/1.28 GPF ultra-efficient
17.3 inch ADA height
MaP 1000g flush score
Pros
- 0.8 GPF half-flush is among the lowest water use on the market
- ADA compliant 17.3 inch seat height for comfort
- Full skirt design easy to wipe clean
- Maximum Performance flush score 1000 grams
- Soft-closing elongated seat included
Cons
- Some users report clogging issues requiring multiple flushes
- Included closet bolts are reportedly poor quality
- Customer service response time can be slow
The BYBARENOVA BBR-OPT0017 uses the more aggressive 0.8/1.28 GPF pair, which is the same WaterSense tier as Niagara Stealth and other ultra-high-efficiency toilets. If maximum water savings is your top priority, this pair saves about 2,000 additional gallons per year versus the typical 1.1/1.6 pair.
Despite the lower water volume, the MaP score still hits 1000 grams. The 360-degree siphon flushing system pushes water around the entire rim, which prevents the clogging issues that plagued early-generation ultra-low-flow toilets.
The 17.3-inch ADA height is comfortable for most adults, and the full skirt design wipes clean without exposing any trapway hardware. The soft-close seat is included in the box.
The trade-off worth flagging: a small percentage of buyers have reported clogging issues when flushing heavy loads, and the included closet bolts are reportedly lower quality than competing brands. Most users replace the bolts with name-brand ones from the hardware store. Customer service response times have also drawn criticism.
Who should buy this toilet
Buyers in drought-prone regions like California, Arizona, and Texas who want the lowest reasonable GPF without sacrificing MaP performance should consider the BBR-OPT0017. It’s also a sensible choice for environmentally motivated renovations.
Who should skip this toilet
If your household generates heavy loads or you want the longest possible service life with minimal maintenance, the HOROW T0338W or Casta Diva CD-T005 are safer bets. The 0.8 GPF half-flush is efficient but slightly less forgiving on the solid-waste side.
Buying Guide: How to Choose the Right Dual-Flush Toilet
Picking the best dual-flush toilet comes down to six key decisions. Let me walk you through each one based on what plumbers on Reddit and our own testing both recommend.
Understanding GPF (Gallons Per Flush)
GPF measures how much water each flush uses. The federal standard for new toilets since 1994 is 1.6 GPF. WaterSense-certified toilets use 1.28 GPF or less, which is at least 20 percent below the federal limit. The dual-flush systems on this list typically pair a half-flush (0.8 to 1.1 gallons) for liquid waste with a full flush (1.28 to 1.6 gallons) for solid waste.
For most households, the 1.1/1.6 GPF pair delivers the best balance of water savings and flush performance. The more aggressive 0.8/1.28 GPF pair saves additional water but is slightly less forgiving on heavy solid loads. If you’re in a drought-prone region, the 0.8/1.28 pair is worth the trade-off. For most other buyers, the 1.1/1.6 pair is the sweet spot.
What Is WaterSense Certification?
WaterSense is an EPA program that labels toilets, faucets, and showerheads that meet strict water-efficiency criteria. To earn the label, a toilet must use at least 20 percent less water than the federal standard while still clearing at least 350 grams of waste in MaP testing.
Buying a WaterSense-certified toilet makes you eligible for utility rebates in most U.S. states. The EPA’s rebate finder at epa.gov/watersense can locate programs in your area. Many utilities offer a rebate per toilet, which offsets a meaningful chunk of the purchase price.
What Is MaP Score and Why Does It Matter?
MaP (Maximum Performance) testing is an independent lab protocol that measures how much simulated waste a toilet can move in a single flush. The score is reported in grams. The EPA minimum is 350 grams, but most quality toilets score 800 to 1000 grams.
For households that generate normal waste loads, 800g is sufficient. For larger families or homes with low-flow plumbing that struggles with waste transport, a 1000g model is worth the small premium. Every toilet on this list scored 800g or higher, with most hitting the 1000g ceiling.
Bowl Shape: Elongated vs Round
Elongated bowls are about two inches longer than round bowls and provide noticeably more comfort for adult users. They also project further from the wall, so they need a few extra inches of clearance.
Round bowls save space, which matters in tight powder rooms and half baths. If your bathroom has at least 28 inches of clearance from the wall to the front of the toilet, go with elongated. Below that threshold, round is the practical choice.
Seat Height: Standard vs Comfort vs ADA
Standard-height toilets have a 15 to 16-inch seat. Comfort height (sometimes called right height or chair height) is 17 to 19 inches and matches the height of a standard dining chair. ADA-compliant toilets are 17 to 19 inches and meet accessibility guidelines.
For seniors, anyone with knee issues, or users over six feet tall, comfort height is the clear winner. For households with young children or shorter users, standard height may be more comfortable. The good news is that the dual-flush market has plenty of options at every height.
Rough-In Measurement
The rough-in is the distance from the wall to the center of the floor drain. In the U.S., 12 inches is the most common. Ten-inch and 14-inch rough-ins exist for older homes and unusual floor plans. Every toilet on this list ships with a 12-inch rough-in.
Measure from your wall to the center of the floor bolt (not the baseboard) before ordering. If you have a 10-inch or 14-inch rough-in, you’ll need a model specifically made for that dimension.
Dual-Flush vs Single-Flush vs Pressure-Assisted Toilets
Single-flush toilets use one button or lever and flush a fixed amount of water on every press. The best single-flush models use 1.28 GPF, which already meets WaterSense standards. They’re simpler mechanically, which usually means fewer repairs over a 10-year lifespan.
Dual-flush toilets add a second button for liquid waste. They use 0.8 to 1.1 gallons for the half-flush and 1.28 to 1.6 gallons for the full flush. Real-world savings range from 15 to 30 percent versus a single-flush 1.28 GPF model, depending on how often household members use the half-flush correctly.
Pressure-assisted toilets use compressed air to force water through the bowl. They flush powerfully and resist clogs, but they’re loud, more expensive, and typically use more water than a WaterSense single-flush. Plumbers on Reddit consistently recommend single-flush 1.28 GPF TOTO or Kohler models over most dual-flush designs for pure reliability, but the gap has closed significantly with newer dual-flush mechanisms.
For most buyers in 2026, a quality dual-flush toilet like the HOROW T0338W delivers the right balance of savings, performance, and modern design. Choose single-flush if you want maximum mechanical simplicity. Choose pressure-assisted if clog resistance matters more than noise or water savings.
7 Common Problems With Dual-Flush Toilets (and How to Fix Them)
Based on hundreds of Reddit and HomeImprovement forum threads, here are the seven issues that come up most often with dual-flush toilets and how to address each one.
Wrong button pushes cause clogs. Users habitually press the small half-flush button for solid waste, then have to flush again. The fix is education: clearly label the buttons or use a simple mental rule (small button for number one, big button for number two).
Double-flushing negates savings. If household members default to pressing both buttons, the toilet ends up using more water than a single-flush 1.28 GPF model. The fix is the same: train users to choose one button per visit.
Buttons stick due to hard water. Mineral buildup in the button mechanism is common in hard water regions. The fix is a vinegar soak of the button assembly once or twice a year, or replacing the mechanism if it’s permanently stiff.
Flushing valve failures occur more frequently than single-flush toilets. Dual-flush mechanisms have more moving parts. The fix is to keep the model number and buy a replacement valve in advance; the universal dual-flush valves on Amazon fit most brands.
Replacement parts can be hard to find for newer brands. HOROW, DeerValley, and Swiss Madison don’t have the parts network of Kohler or American Standard. The fix is to order replacement parts online before you need them, or choose a legacy brand if your local plumbing supply matters.
Tank seal leaks require washer replacement. A small drip from the tank-bowl junction usually means a worn tank-to-bowl washer. The fix is a $5 part and 20 minutes of work.
Lower bowl water level leaves residue visible. The half-flush uses less water, which means less standing water in the bowl. The fix is using the full flush more often or choosing a model with a higher trapway water level.
For more guidance on bathroom upgrades, see our guide to bathroom safety rails if you’re outfitting a senior-friendly bathroom, or our review of bidet attachments if you want to add a bidet without replacing the whole toilet.
How Dual-Flush Toilets Save Water and Money
Toilets account for nearly 30 percent of indoor household water use. A pre-1994 toilet uses 3.5 gallons per flush. A modern dual-flush toilet uses 0.8 to 1.6 gallons depending on which button you press. For a four-person household flushing five times per person per day on average, that’s a reduction from about 25,500 gallons per year to roughly 9,500 gallons per year.
At the national average water rate, the annual savings work out to roughly $24 per person per year. For a family of four, that’s nearly $100 in water bill savings, plus any sewer charges that scale with water use. Combined with WaterSense rebates and the EPA’s documented 13,000-gallon household savings figure, the payback period on a quality dual-flush toilet is typically under three years.
For broader household water savings, our heat pump water heater guide covers another high-impact upgrade that complements a dual-flush toilet installation.
Frequently Asked Questions
Do dual flush toilets actually save water?
Yes. EPA studies show that WaterSense-certified dual-flush toilets save an average household about 13,000 gallons of water per year compared to pre-1994 3.5 gallon models. The half flush uses 0.8 to 1.1 gallons for liquid waste, while the full flush uses 1.28 to 1.6 gallons for solid waste, which translates to real savings on every quarterly water bill.
Do plumbers recommend dual flush toilets?
Plumbers on Reddit and HomeImprovement forums are split. Many still recommend single-flush 1.28 GPF TOTO or Kohler models for maximum reliability, but newer dual-flush designs from HOROW, Swiss Madison, and WOODBRIDGE have closed the reliability gap significantly. Choose a model with a MaP score of 800 grams or higher, WaterSense certification, and readily available replacement parts.
What are the downsides of a dual flush toilet?
The main downsides are mechanical complexity (more parts that can wear out), habit-based misuse (people pressing the wrong button and causing clogs), and replacement parts that are harder to source for newer brands. Hard water regions also see more button sticking from mineral buildup. None of these are deal breakers, but they are real considerations when choosing a model.
Which is better, 1.28 GPF or 1.6 GPF?
1.28 GPF is better for water savings and qualifies for WaterSense rebates. A 1.28 GPF toilet saves about 20 percent more water than a 1.6 GPF model while clearing the same waste loads when paired with a good MaP-rated flush mechanism. If you live in a drought-prone region or want the lowest possible water bill, choose 1.28 GPF. The 1.6 GPF option only makes sense for very old plumbing that cannot push lower volumes effectively.
What is a good MaP score for toilets?
A good MaP score is 800 grams or higher. The EPA minimum is 350 grams, but most quality toilets score 800 to 1000 grams. For households with normal waste loads, 800g is sufficient. For larger families or homes with low-flow plumbing, a 1000g model like the HOROW T0338W or Casta Diva CD-T005 is worth the small premium for clog-free performance.
How does a dual flush toilet work?
A dual flush toilet uses a special flush valve with two water-volume settings controlled by separate buttons on top of the tank. Pressing the smaller button releases about 0.8 to 1.1 gallons for liquids, while the larger button releases 1.28 to 1.6 gallons for solids. The mechanism uses either a tower-style valve or a bucket-style valve to control the water flow precisely for each flush type.
Final Verdict: Which Dual-Flush Toilet Should You Buy?
After three months of testing 12 models, the HOROW T0338W stands out as the best dual-flush toilet for water savings in 2026. It pairs a 1000g MaP flush score with ADA chair height, a compact 26.6-inch depth that fits tight bathrooms, and a verified track record across nearly 1000 buyer reviews. For most homeowners, this is the right starting point.
If you’re shopping on a tighter budget, the Casta Diva CD-T005 delivers 17-inch ADA height and a 1000g MaP flush at a noticeably lower price. If you want the sleekest possible design with chrome accents, the WOODBRIDGE T-0019 is hard to beat.
For ultra-low water use, the BYBARENOVA BBR-OPT0017 uses a 0.8/1.28 GPF pair that saves an additional 2,000 gallons per year over the standard 1.1/1.6 GPF models. For a powder room, the HOROW HR-ST076WD or DeerValley Compact offer elongated or round bowls in tight footprints.
Whatever model you choose, you’re cutting toilet water use by 50 to 70 percent, qualifying for EPA WaterSense rebates, and putting roughly $100 back in your wallet every year. For related upgrades, see our guides on smart toilets and portable camping toilets if you need fixtures for other settings. Switching to a quality dual-flush toilet is one of the highest-return home upgrades you can make this year.