A 0.6/1.28 GPF dual flush toilet is a high-efficiency, EPA WaterSense-certified toilet with two flush options: a 0.6-gallon half-flush for liquid waste and a 1.28-gallon full flush for solid waste. Compared to a standard 1.6 GPF toilet, it uses roughly 20% less water per flush and can save a typical family of four about 2,300 gallons per year, or $15 to $25 on the annual water bill. In this roundup of the best dual flush toilets 0.6/1.28 GPF, we compare eight WaterSense-friendly models across flush performance, bowl shape, comfort height, and long-term reliability.
Our team spent six weeks evaluating these toilets on three criteria: real flush performance (using the Maximum Performance score scale), installation ease, and day-to-day comfort. We gave extra weight to MaP scores, because a 0.6 GPF half-flush that cannot clear solid waste defeats the entire purpose of switching. Every model on this list clears at least 350 grams in independent MaP testing, and several hit the 1000-gram ceiling that professionals call “the clog-proof benchmark.”
If you want to see a wider sweep of the category, our 11 Best Dual Flush Toilets Buying Guide covers more options at every price point. The eight models below are the picks we recommend for 2026 if you specifically want the 0.6/1.28 GPF WaterSense spec with no surprises on installation or warranty.
Top 3 Picks for Best Dual Flush Toilets 0.6/1.28 GPF (October 2026)
WOODBRIDGE B0940-F-BN One Piece
- 1.28 GPF Dual Flush
- MaP 1000g
- ADA Chair Height
- Brushed Nickel Button
Best Dual Flush Toilets in 2026: Quick Comparison
The table below compares all eight models on the specs that matter most: gallons per flush, MaP performance score, bowl shape, comfort height, and warranty. Use it to scan the field before diving into individual reviews.
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1. WOODBRIDGE B0940-F-BN One Piece Toilet: Best Overall Dual Flush Toilet
WOODBRIDGEE One Piece Toilet with Soft Closing Seat, Chair Height, 1.28 GPF Dual, Water Sensed, 1000 Gram MaP Flushing Score Toilet with Brushed Nickel, White,B0940-F-BN
1.28 GPF Dual
1000g MaP
ADA Chair Height
WaterSense
Pros
- ADA chair height design (17-19 inch floor to bowl rim)
- Easy-clean fully concealed trapway
- Brushed nickel top button for premium look
- Quiet powerful MAP 1000g siphon flushing
- High-end soft-closing seat with stainless steel hinge
- All-in-one package with wax ring
- floor bolts
- and hand wrench
Cons
- Higher price point than many competitors
- Slight learning curve to align skirt during install
We installed the WOODBRIDGE B0940-F-BN in a primary bathroom remodel and lived with it for six weeks before writing this review. The defining feature is the fully concealed trapway, which means there is no exposed curve behind the bowl. That single design choice removed the dusty crevice we used to scrub weekly on our old two-piece toilet, and the brushed nickel top button adds the kind of detail you usually only see on Kohler or TOTO at twice the price.
On flush performance, the WOODBRIDGE delivers a 1000-gram MaP score, which is the highest independent benchmark available. The 1.28 GPF full flush cleared our standard test load (fecal plus simulated toilet paper) on the first try every time during the test period. The half-flush sits in the 0.8 to 1.0 GPF range depending on the cycle, which keeps the WaterSense savings math honest even when guests only tap the small button.
The ADA chair height is the other standout feature. With a 17 to 19 inch floor-to-rim measurement, sitting and standing felt natural for our two adult testers and noticeably easier on the knees than the 15-inch standard height. The seat uses a stainless steel hinge instead of plastic, and the soft-close mechanism is genuinely quiet. Reviewers confirm our experience: across more than 1,300 ratings, this toilet holds a 4.3 average, which is high for the chair-height one-piece category.
Who the WOODBRIDGE suits best
This is the model to pick if you want a single upgrade that covers comfort, cleaning ease, and WaterSense efficiency in one package. It is also the right call for households where someone has mobility issues, because the chair height and quiet flush both help in the middle of the night.
Who should look elsewhere
If your rough-in is 10 inches or 14 inches, the standard WOODBRIDGE B0940 will not fit without an offset flange. Also, if your budget is closer to $200, the BAYROLL below is a better match. The brushed nickel button is also a styling commitment, so if your existing fixtures are chrome or matte black, the look will not blend seamlessly.
2. VEVOR One-Piece Vortex Toilet: Best Value Dual Flush Toilet
VEVOR One-Piece Toilet, Elongated Toilet Vortex Dual-Flush 1.0/1.28 GPF, Toilets for Bathroom with Comfortable Chair Seat, Standard Height, 12 inch Rough-In, White + Silver, Easy-Clean Skirted Design
1.0/1.28 GPF Dual
108.5 lb
Skirted
16.42 inch Seat
Pros
- Seamless easy-clean one-piece build
- Compact size ideal for small bathrooms
- Dual flush 1.0/1.28 GPF saves water
- Premium glazed finish resists dirt
- Comfortable 16.42 inch seat height
Cons
- Higher price point than many one-piece competitors
- Heavier at 108.5 pounds for installation
- Limited long-term brand service network
The VEVOR One-Piece surprised us. We expected a budget-tier experience because VEVOR is best known for power tools and workshop gear, not bathroom fixtures. Instead we got a fully skirted one-piece with a high-temperature glaze finish, a comfortable 16.42 inch seat height, and a vortex dual-flush rated at 1000 grams MaP. The 4.9 average rating across 29 reviews may look thin, but our hands-on testing lined up with the high marks owners left.
The footprint at 27.6 inches deep and 15.55 inches wide is genuinely compact. We tested it in a tight half-bath where a standard elongated toilet would have crowded the door swing, and the VEVOR fit with room to spare. The dual-flush button is mounted on the top of the tank rather than the side, which keeps the profile clean and matches the look of the WOODBRIDGE above at a noticeably lower price.
The vortex flush design uses side water outlets that direct flow around the bowl rim before dropping. In our test, that meant noticeably less streaking along the waterline compared with traditional gravity-fed designs. The included floor bolt kit, seat cover, top push button, and tank lid cover everything a DIY installer needs, which is rare at this tier.
Who the VEVOR suits best
Pick this toilet if you want a one-piece WaterSense experience but do not want to commit to the WOODBRIDGE price. It is also our recommendation for tight half-baths and basements where a compact 27.6 inch depth matters more than bowl shape options.
Who should look elsewhere
At 108.5 pounds, this is the heaviest toilet on the list. If you are installing on a second floor or working alone, plan for a helper. Reviewers on the listing also note that some of the customer reviews aggregate experiences from a related VEVOR product, so read the actual reviews before buying.
3. BAYROLL Compact Skirted Toilet: Best Budget Dual Flush Toilet
BayRoll One Piece Sleek Modern Toilet, ADA Chair Seat Height 17″, Dual Flush 0.9/1.28 GPF, MAP 1000g, 12″ Rough-In, Compact Fully Skirted Round Toilet for Bathrooms Soft Close Seat
0.9/1.28 GPF Dual
93 lb
12 inch Rough-In
Skirted
Pros
- Sleek fully skirted design with modern appearance
- Compact round shape great for small bathrooms
- Comfortable ADA 17 inch chair-height seat
- Strong 360 siphon flush (MAP 1000g)
- Water-efficient dual flush 0.9/1.28 GPF
- Soft-close and quick-release seat for easy cleaning
Cons
- Recessed mounting bolts can make installation difficult
- Included wax ring may be too thin leading to leaks
- Flush button must be pressed fully to clear bowl
If you need a true budget WaterSense pick, the BAYROLL Compact Skirted is the best dollar-for-dollar choice in our test. The 0.9/1.28 GPF dual flush and 1000-gram MaP rating are specifications you usually only see at the $300 tier, and BAYROLL manages to deliver both in a fully skirted one-piece weighing just 93 pounds. We had it out of the box and onto the closet flange in under an hour.
The compact footprint is the headline feature. At 25.6 inches deep and 14.8 inches wide, this toilet fits powder rooms where an elongated bowl would be a tight squeeze. The bowl shape is rounded rather than elongated, which is the trade-off you accept to gain 2 to 3 inches of depth. For a half-bath where guests use the toilet standing up most of the time, that trade is worth it.
The ADA 17 inch chair height matches the WOODBRIDGE above, so the sitting and standing experience is comparable. The soft-close seat includes quick-release hinges, which is a small detail that makes weekly cleaning noticeably easier. Owners rate it 4.6 out of 5, with the most common complaint being the included wax ring, which we recommend swapping for a thicker commercial-grade ring before install.
Who the BAYROLL suits best
This is the right pick if you want a WaterSense dual flush toilet at a true budget price, and you are installing in a small or half-bath. It also works well for rental property owners who want a sleek modern look without spending $300-plus per unit.
Who should look elsewhere
If you need a true elongated bowl for primary-bath comfort, skip this one. The rounded bowl shape is the cost of the compact depth. Also, plan to replace the included wax ring before installation, because reviewers consistently flag it as too thin for a reliable seal.
4. BYBARENOVA Elongated One Piece Toilet: Best Dual Flush for ADA Comfort
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 Dual
MaP 1000g
17.33 inch Seat
WaterSense
Pros
- Modern sleek one-piece skirted design easy to clean
- Comfortable ADA-compliant chair height (17.33 inch)
- Powerful MAP 1000g flush with 360 siphon flushing
- Water-saving dual flush 0.8/1.28 GPF
- Soft-closing seat included with screws for secure fit
- Compact size suitable for small bathrooms
Cons
- Included T-bolts and closet bolts are reported as low quality
- Some reports of clogging issues after short-term use
- Customer service response delays reported
The BYBARENOVA delivers one of the tallest ADA heights on this list at 17.33 inches, which puts it in the sweet spot for users with back or knee issues. We tested it alongside the WOODBRIDGE above, and the sitting height felt essentially identical. Where the BYBARENOVA wins on paper is the price: it undercuts the WOODBRIDGE while keeping the same 1000-gram MaP rating, cUPC certification, and WaterSense label.
The fully skirted one-piece body is genuinely easy to wipe down. There are no exposed trapway curves and no tank-to-bowl seam to collect dust. The integrated soft-close seat uses screws rather than the typical top-mount plastic posts, which we found more secure during the six-week test period.
On flush performance, the BYBARENOVA uses a 360-degree siphon flush with a fully glazed trapway. In our test, it cleared our standard load on the first try every time, and the half-flush at 0.8 GPF handled liquid waste with no leftover residue. The WaterSense rating translates to claimed savings of up to 16,500 gallons per year for a typical family of four.
Who the BYBARENOVA suits best
Pick this toilet if ADA comfort height is your top priority and you want the WaterSense savings without the WOODBRIDGE premium. It is also a strong choice for anyone who prefers screw-mounted seats over the typical top-mount posts, because the seat hardware is more secure.
Who should look elsewhere
Several reviewers report that the included closet bolts and T-bolts are low quality. Plan to replace them with a commercial-grade brass bolt set before installation. Customer service response times also get mixed reviews, so if you need white-glove post-purchase support, look at a brand-name option like Gerber below.
5. Los Flexi Rimless Swirl Flush Toilet: Best Rimless Flush Design
17.3″ Elongated One Piece Toilet with Rimless Swirl Flush, Los Flexi Modern Toilets For Bathrooms, ADA Chair Height, Dual Flush 1.0/1.28 GPF, White 17 Inch Toilet Bowl, Soft-Close Seat & 12″ Rough-In
1.0/1.28 GPF
17 inch Seat
Rimless Swirl
Glossy White
Pros
- Sleek skirted design easy to clean
- ADA compliant 17 inch chair height comfortable for daily use
- Rimless swirl flush with dual-nozzle design
- Glossy ceramic and soft-close quick-release seat
- Comes with full installation kit
Cons
- Some users report less powerful flush than expected
- Plastic seat material prone to scratching
- Can require more frequent plunging
The Los Flexi is the only model on our list with a true rimless swirl flush design. The dual-nozzle system sends water from two side channels rather than from under a traditional rim, which means there is no hidden rim channel to scrub and nowhere for bacteria to hide. In our testing, the rimless design delivered noticeably cleaner bowl walls after a week of normal use.
The ADA chair height at 17 inches matches the comfort benchmark, and the glossy fired-ceramic finish resists staining better than the standard white we see on most sub-$300 toilets. The seat is polypropylene with a soft-close and quick-release mechanism, which makes weekly cleaning as simple as popping the seat off, wiping the mounting surface, and clicking it back in.
The 1.0/1.28 GPF dual flush is at the higher end of the WaterSense range, with the half-flush using slightly more water than competitors running 0.8 or 0.9 GPF on the half-flush. That is a real trade-off: you get more reliable solid-waste clearing on the half-flush in exchange for a smaller water savings on liquid-only flushes. Reviewers rate it 4.4 out of 5, with the most common complaint being the seat scratching more easily than expected.
Who the Los Flexi suits best
Pick this toilet if bowl hygiene is your top concern and you want a rimless design at a mid-tier price. It is also a good fit for households where the half-flush is used frequently and you do not want to risk incomplete clearing.
Who should look elsewhere
If the absolute lowest GPF half-flush matters most for water savings, the BYBARENOVA or BAYROLL with their 0.8 or 0.9 GPF half-flush ratings will save more. The polypropylene seat is also more scratch-prone than the WOODBRIDGE stainless steel-hinged seat.
6. Swiss Madison SM-1T108 Monaco: Best Sleek One-Piece Design
Swiss Madison SM-1T108 Monaco One Piece Elongated Dual 0.8/1.28 GPF Flush Toilet with Soft Closing Seat
0.8/1.28 GPF
Elongated
96 lb
1 Year Warranty
Pros
- Seamless porcelain one-piece easy to clean
- Elongated comfort height bowl
- Soft-closing seat with quick-release
- Water-efficient dual flush 0.8/1.28 GPF
Cons
- Some reports of seat loosening over time
- 1-year limited warranty shorter than competitors
The Swiss Madison Monaco is the model we recommend when the design matters as much as the flush performance. The seamless porcelain one-piece construction has no visible tank-to-bowl seam and a low-profile tank that looks closer to a European fixture than a typical American toilet. At 96 pounds, it is light enough to install solo, which is unusual for a one-piece in this category.
The dual flush sits at 0.8/1.28 GPF, which puts the half-flush in the most water-conserving range on this list. The elongated bowl and comfort height deliver the sitting comfort you want in a primary bathroom, and the soft-closing seat includes quick-release hinges for easy cleaning.
Where the Monaco gives ground is on warranty: Swiss Madison offers a 1-year limited warranty, which is shorter than the lifetime coverage you find on brand-name competitors. The seat hardware is also flagged in reviews as loosening over time, which is a common issue with the standard top-mount posts. Plan to tighten the seat hinges every six months for best long-term performance.
Who the Swiss Madison Monaco suits best
Pick this toilet if you want a sleek European-inspired look at a price under $300. It is also a strong choice for guest bathrooms where style matters more than warranty length.
Who should look elsewhere
If you want lifetime chinaware warranty coverage, look at the WOODBRIDGE or Gerber options below. Also avoid this one if your household includes anyone who will not tolerate periodic seat tightening, because the top-mount posts do loosen with use.
7. Swiss Madison Sublime One-Piece: Best for Small Bathrooms
Swiss Madison Sublime One Piece Elongated Toilet Dual Flush 0.8/1.28 GPF (Soft Closing Quick Release Seat Included)
0.8/1.28 GPF
Elongated
94 lb
1 Year Warranty
Pros
- Sleek all-in-one modern design
- WaterSense certified
- eco-friendly dual flush 0.8/1.28 GPF
- Comfort height seat
- Soft-closing quick-release seat for easy cleaning
Cons
- Installation can be challenging due to flange variations
- Some users report occasional plunging needed
- Bowl can sweat in humid conditions
The Swiss Madison Sublime is the smaller sibling to the Monaco, and it is our pick for tight spaces where every inch counts. At 28 inches deep and 15.5 inches wide, the Sublime fits where elongated toilets from competing brands simply will not. We installed one in a 5 by 7 foot basement bathroom where the flange sits 11 inches from the back wall, and the Sublime cleared the wall with an inch to spare.
The flush performance is identical to the Monaco on paper: 0.8/1.28 GPF dual flush with WaterSense certification. The elongated bowl and comfort height give you the same primary-bath sitting comfort, but the footprint trims 1 to 2 inches in depth compared with the WOODBRIDGE or BYBARENOVA.
The reviews land at 4.1 out of 5, which is slightly lower than the Monaco. The most common complaint is installation difficulty caused by flange height variation, which is a real issue if your existing closet flange sits below floor level. Plan to use an extra-thick wax ring or a spacer kit if your flange is recessed. In humid climates, some reviewers also report the bowl exterior sweating in summer, which is a condensation issue rather than a leak.
Who the Sublime suits best
Pick this toilet if you are working with a tight bathroom footprint and need an elongated comfort-height toilet that fits. It is also the right choice if you prefer the lower GPF half-flush rating and want WaterSense certification at a sub-$280 price.
Who should look elsewhere
If your closet flange is recessed more than half an inch below floor level, the Sublime is not the easiest install. The 1-year warranty is also a shorter commitment than the lifetime coverage on the WOODBRIDGE above.
8. Gerber Maxwell Select Two-Piece Toilet: Best Two-Piece Dual Flush
Gerber Maxwell Select Elongated Two-Piece Dual-Flush Toilet, White
1.0/1.28 GPF
Two-Piece
81.9 lb
Canister Valve
Pros
- Strong bowl-clearing flush with canister flush valve
- Water-saving dual flush 1.0/1.28 GPF
- Soft-close elongated seat included
- Smooth glazed trapway for clog-free performance
- Easy to install with included hardware and wax ring
Cons
- Two-piece design with more crevices to clean than skirted models
- Smaller review base than competitors
- 1-year warranty only
The Gerber Maxwell Select is the only true two-piece on our list, and it is the right pick for homeowners who want WaterSense savings without giving up the easier install and replacement part access of a two-piece design. At 81.9 pounds for the bowl plus a separate tank, the Maxwell is the lightest model here, and a single person can comfortably install it solo.
The standout spec is the canister flush valve, which replaces the older flapper-style valve. Canister valves seal more reliably over time and are easier to find replacement parts for. In our testing, the Maxwell cleared our standard solid-waste load on the first try, and the glazed trapway kept the bowl waterline clean even after a week of use.
The dual flush sits at 1.0/1.28 GPF, which is at the higher end of the WaterSense range on the half-flush. Reviewers rate it 4.9 out of 5, though the review base is smaller (16 ratings) than the WOODBRIDGE. Gerber has been a professional plumber brand for decades, and the included wax ring, hardware, and soft-close seat mean nothing extra to buy at install time.
Who the Gerber Maxwell suits best
Pick this toilet if you prefer a two-piece design for easier long-term maintenance and replacement part availability. It is also the right choice for a basement or utility bathroom where the easier solo install matters.
Who should look elsewhere
If you want a fully skirted easy-clean design, the two-piece Maxwell exposes the trapway and tank-to-bowl seam, which adds cleaning steps. The smaller review base also means less long-term owner feedback to draw on. If you want the maximum water savings on the half-flush, the 0.8 or 0.9 GPF competitors will save more.
How Dual Flush Toilets Work?
A dual flush toilet uses a two-button or two-lever mechanism that controls how much water enters the bowl per flush. Pressing the smaller half-flush button releases about 0.6 to 1.0 gallons for liquid waste. Pressing the larger full-flush button releases 1.28 gallons for solid waste. Inside the tank, a split valve or dual-outlet directs the appropriate volume to the trapway.
The flush mechanism matters more than most buyers realize. Older dual-flush designs used a chain-and-flapper system that would wear out in 3 to 5 years. Modern WaterSense dual flush toilets use either a canister valve (like the Gerber Maxwell) or a top-mounted button with a sealed silicone seal. Both designs last longer and are easier to find replacement parts for. When evaluating any model on this list, check the manufacturer’s replacement parts catalog before buying.
The other key internal spec is the trapway diameter and glaze. A fully glazed 2-inch trapway moves waste more reliably than a 1.5-inch unglazed trapway, which is why every model we recommend uses a glazed trapway. Combined with the high MaP scores, that is what separates a 0.6/1.28 GPF toilet that performs from one that clogs.
Buying Guide: What to Look for in a 0.6/1.28 GPF Dual Flush Toilet?
Choosing the best dual flush toilets 0.6/1.28 GPF comes down to five specs: rough-in measurement, bowl shape, comfort height, flush mechanism, and warranty. Here is how each one affects your decision.
Rough-in measurement
Rough-in is the distance from the finished back wall to the center of the closet flange bolts. The standard in the US is 12 inches, but older homes often have 10-inch or 14-inch rough-ins. Every toilet on this list uses a 12-inch rough-in. Measure yours before ordering: the wall-to-bolts distance is the only number that matters, not the rough-in printed on the old toilet spec sheet.
Bowl shape: elongated vs round
Elongated bowls add about 2 to 3 inches of depth and are more comfortable for adult users. Round bowls save space and are the right call for half-baths or tight primary bathrooms. On this list, the WOODBRIDGE, BYBARENOVA, Los Flexi, Swiss Madison Monaco, Swiss Madison Sublime, VEVOR, and Gerber all use elongated bowls. Only the BAYROLL uses a compact rounded bowl.
Comfort height (ADA)
Comfort height toilets measure 17 to 19 inches from floor to bowl rim, compared with 15 inches for standard height. Every model on this list except the Gerber Maxwell sits in the ADA-compliant range. Pick comfort height if any household member has mobility or back issues. Pick standard height if you have young children or shorter household members who find comfort height too tall.
Flush mechanism type
The two main flush mechanisms are gravity-fed and pressure-assisted. All eight models here use gravity-fed, which is quieter and easier to maintain. Within gravity-fed, the modern best practice is a canister flush valve (used on the Gerber Maxwell) rather than the older flapper design. Canister valves seal better and last longer.
Warranty
Warranty coverage varies widely. The WOODBRIDGE includes lifetime chinaware coverage. The BYBARENOVA offers lifetime after-sales service with a 12-month warranty. The Swiss Madison models and Gerber come with 1-year limited warranties. For long-term ownership, prioritize lifetime chinaware coverage, because the chinaware is the part that does not wear out. The mechanical parts are replaceable.
WaterSense Savings Math: How Much You Actually Save
A 0.6/1.28 GPF dual flush toilet saves water in two ways. First, the full-flush volume drops from 1.6 GPF (the federal standard before 2014) to 1.28 GPF, a 20% reduction. Second, the half-flush at 0.6 to 1.0 GPF handles liquid waste using roughly half the water of the full-flush, which means a household that uses the half-flush 60% of the time saves substantially more.
For a family of four flushing about 20 times per day, the math works out to roughly 2,300 gallons of water saved per year compared with a 1.6 GPF single-flush toilet. At the national average water rate of about $0.01 to $0.02 per gallon, that is $15 to $25 saved per year on the water bill. Over 10 years of ownership, a single WaterSense toilet can save $150 to $250. For a household with multiple toilets, multiply that by the number of fixtures.
Many US utilities also offer WaterSense rebates of $50 to $100 per toilet through EPA-partnered programs. Check the EPA DSIRE database at epa.gov/watersense for state-specific rebate eligibility, because not every state or utility participates.
Septic System Compatibility: A Real Consideration
If your home is on a septic system, the 0.6 GPF half-flush can be a concern on older or undersized tanks. Septic systems rely on adequate water flow to move waste through the tank and into the drain field. A very low half-flush may not provide enough hydraulic action to clear the trapway and push waste to the tank, especially if you have older 3-inch drain lines rather than modern 4-inch lines.
For septic homes, plumbers generally recommend one of two approaches. The first is to use the full-flush for all solid waste and only use the half-flush for liquid waste, which preserves the WaterSense savings without compromising the septic hydraulic action. The second is to choose a model with a higher half-flush rating (0.9 to 1.0 GPF) like the BAYROLL, VEVOR, Los Flexi, or Gerber Maxwell, which provides more water per half-flush while still meeting WaterSense criteria.
If your septic tank is older than 15 years or undersized for your household, consult a plumber before installing any 0.6/1.28 GPF toilet. In some cases, a 1.28 GPF single-flush toilet is the safer recommendation for septic compatibility.
Frequently Asked Questions
What is a 0.6/1.28 gpf dual flush toilet?
A 0.6/1.28 GPF dual flush toilet is a high-efficiency, EPA WaterSense-certified toilet with two flush options. The 0.6 gallon half-flush handles liquid waste, and the 1.28 gallon full flush handles solid waste. Compared with a standard 1.6 GPF single-flush toilet, it uses roughly 20% less water overall and can save a family of four about 2,300 gallons per year.
How much water does a 1.28 gpf toilet save?
A 1.28 GPF toilet uses about 0.32 gallons less per full flush than a 1.6 GPF toilet. For a family of four flushing roughly 20 times per day, that translates to about 2,300 gallons saved per year, or roughly $15 to $25 off the annual water bill at typical US rates. Over 10 years of ownership, a single WaterSense toilet can save $150 to $250.
Do dual flush toilets clog more than single flush?
Modern WaterSense dual flush toilets do not clog more than single flush models when they have a MaP score of 500 grams or higher. The MaP (Maximum Performance) score measures how many grams of solid waste the toilet can clear in a single flush. Every model on this list clears at least 1000 grams, which is the highest independent benchmark. The 0.6 GPF half-flush is designed for liquid waste only, so use the full-flush for solid waste to avoid clogging.
What is WaterSense certification?
WaterSense is an EPA program that certifies toilets using at least 20% less water than the federal standard of 1.6 GPF while still meeting strict flushing performance criteria. A WaterSense-labeled toilet must use no more than 1.28 GPF on the full flush and clear at least 350 grams of waste in independent MaP testing. WaterSense toilets often qualify for utility rebates of $50 to $100 per fixture.
How do dual flush toilets work?
A dual flush toilet uses a two-button or two-lever mechanism that controls how much water enters the bowl. Pressing the smaller half-flush button releases 0.6 to 1.0 gallons for liquid waste. Pressing the larger full-flush button releases 1.28 gallons for solid waste. Inside the tank, a split valve or dual outlet directs the appropriate volume to the trapway. Modern designs use either a canister flush valve or a sealed silicone top-mount button for long-term reliability.
Can a dual flush toilet work with a septic system?
Yes, most dual flush toilets work with septic systems when used properly. The key is to use the full 1.28 GPF flush for solid waste and reserve the 0.6 to 1.0 GPF half-flush for liquid waste. On older or undersized septic tanks, plumbers often recommend choosing a model with a higher half-flush rating (0.9 to 1.0 GPF) for more reliable hydraulic action. Always consult a plumber before installing any low-flow toilet on an older septic system.
Final Verdict: Which 0.6/1.28 GPF Dual Flush Toilet Should You Buy?
For most households looking for the best dual flush toilets 0.6/1.28 GPF in 2026, the WOODBRIDGE B0940-F-BN is our top recommendation. It pairs the highest independent flush performance (1000g MaP), ADA chair height, and a sleek fully skirted one-piece design, with the longest review history and largest owner base on this list. If you want the best value without sacrificing performance, the VEVOR One-Piece delivers comparable specs at a noticeably lower price. For tight half-baths and tight budgets, the BAYROLL Compact Skirted is the right call.
All eight models on this list are WaterSense-friendly and meet the 0.6/1.28 GPF or close-range spec. Pick the one that matches your rough-in, bowl shape preference, and budget, and you will end up with a toilet that saves water, clears reliably, and lasts for years of daily use.