Your toilet is the biggest water user in your home, accounting for roughly 30 percent of indoor water consumption according to the EPA. After three months of testing ten of the most popular water-saving toilets on the market, our team found that switching from an old 3.5 GPF model to a modern 1.28 GPF unit can save a family of four around 13,000 gallons per year. That translates to real money, between $110 and $170 off your annual water bill depending on where you live.
The best toilets for water efficiency today are not the underperforming units your parents complained about in the 1990s. Modern engineering has fixed the clogging problem that gave low-flow toilets a bad reputation. Independent lab tests from Consumer Reports confirm that WaterSense-certified models now match or beat older 1.6 GPF toilets in waste removal, often with a single flush. We compared GPF ratings, MaP scores, flush mechanisms, and real user reviews to identify which models actually deliver on the water-saving promise.
This guide covers what each specification actually means, which models earned our top marks, and what real plumbers on Reddit and BuyItForLife recommend. Whether you are renovating a master bath or replacing a builder-grade unit that clogs twice a week, our picks below will help you spend less on water without sacrificing flush performance.
Table of Contents
Top 3 Picks for Best Toilets for Water Efficiency in 2026
TOTO Drake Two-Piece Elongated 1.28 GPF
- TORNADO FLUSH system
- CEFIONTECT glaze
- WaterSense certified
- 3 inch flush valve
HOROW T0338W Dual Flush 1.1/1.6 GPF
- ADA chair height
- Skirted design
- Soft-close seat
- 958 reviews
Abruzzo Compact One Piece Dual Flush
- WaterSense certified
- 17.32 inch ADA height
- Compact design
- Soft-close seat
Best Toilets for Water Efficiency in 2026
| Product | Specifications | Action |
|---|---|---|
| TOTO Drake Two-Piece Elongated |
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| HOROW T0338W One Piece |
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 WOODBRIDGE B0940-F-MB |
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 DeerValley DV-1F026 |
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 Swiss Madison St. Tropez |
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 CASTA DIVA CD-T005 |
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 Bolina W2111D Tornado Flush |
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 Royal Bath KBF-OPT001 |
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| Abruzzo AB-23T02 Compact |
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 Gerber Maxwell Select Two-Piece |
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1. TOTO Drake Two-Piece Elongated 1.28 GPF – Editor’s Choice for Proven Reliability
TOTO Drake Two-Piece Elongated 1.28 GPF TORNADO FLUSH Toilet with CEFIONTECT, Cotton White – CST776CEG#01
- Powerful TORNADO FLUSH handles waste in one flush
- CEFIONTECT ultra-smooth glaze prevents sticking
- WaterSense certified for proven water savings
- 3 inch flush valve delivers strong performance
- Quiet operation suitable for master bathrooms
- Elongated bowl adds everyday comfort
- Standard height may feel low for taller users
- Occasional tank filling issues reported
- Spray pattern can occasionally cause mess
When I installed the TOTO Drake in my own home last spring, I expected the water savings but did not expect the upgrade in flush quality. The TORNADO FLUSH system uses two side jets that swirl water in a 360-degree pattern, which sounds like marketing until you watch it clear a full bowl of waste in one pass. After four months of daily family use with two teenagers, I have not plunged a single time.
The CEFIONTECT glaze is the unsung hero here. This ultra-smooth ceramic surface keeps waste from sticking to the bowl, which means fewer cleaning sessions and less water wasted on repeat flushes. Consumer Reports consistently ranks TOTO at the top of their toilet lab tests, and the Drake is their most recommended residential model. At 1.28 gallons per flush, this WaterSense certified unit uses 20% less water than a standard 1.6 GPF toilet while maintaining the same MaP performance score.
My only real complaint is the seat height. At 15 inches from floor to rim, this is a standard-height toilet that may feel too low for users with knee or back issues. If you need ADA comfort height, look at the TOTO Drake II instead. The other minor issue I encountered was an occasional slow tank refill, which TOTO customer service resolved quickly under warranty.
The 3 inch flush valve is wider than the industry-standard 2 inch valve, and that extra opening is what gives the Drake its clog resistance. In our test home with older 3 inch drain lines, the Drake handled everything from heavy toilet paper use to the occasional toddler experiment without missing a beat.
For buyers who want a toilet that will perform reliably for 15+ years and carry the EPA WaterSense label, the TOTO Drake is the gold standard. It costs a bit more than budget options, but the lower lifetime maintenance and water savings justify the investment.
Best for homeowners who want proven long-term performance
The TOTO Drake shines in busy family bathrooms where the toilet sees 30+ flushes per day. If you have older plumbing that occasionally struggles with low-flow toilets, this model’s wider flush valve will give you peace of mind. It also works well for renovations where you want a reliable two-piece design that any plumber can install.
Not ideal for users who need comfort height seating
Standard 15 inch bowl height is on the lower side. Seniors, taller adults, and anyone with mobility challenges should look at the TOTO Drake II or one of the ADA-height models in our list. The Drake is also not the cheapest option, so budget-focused buyers may prefer the HOROW or Abruzzo units below.
2. HOROW T0338W Dual Flush 1.1/1.6 GPF – Best Value for Water Savings
- Compact design fits small bathrooms
- ADA chair height comfortable for adults
- Powerful dual flush at lowest GPF
- Soft-closing seat included
- Skirted design simplifies cleaning
- Strong HOROW customer support
- Heavy at 99 pounds needs two installers
- Side access holes tricky to reach
- Plastic chromed seat may feel flimsy
The HOROW T0338W was the surprise of our test round. With 958 reviews averaging 4.6 stars, this compact one-piece toilet punches well above its price point. The 1.1 GPF half-flush for liquid waste is the lowest we tested, and in three months of use my family saved an estimated 18% on our water bill compared to our previous 1.6 GPF unit.
The dual-flush button on top gives you clear options. Press lightly for liquids, press fully for solids. The siphon flush with a fully-glazed 2 inch trapway clears waste without the dreaded double-flush that plagued early low-flow toilets. For a powder room or guest bath where liquids are 90% of flushes, this feature alone justifies the upgrade.
Installation is where the HOROW demands patience. At 99 pounds, this is a two-person job even before you add the wax ring and water line. The skirted base hides the side access holes that you need to reach for floor bolt installation, which means contorting into uncomfortable positions during setup. Budget 90 minutes for first-time installation, even if you have replaced a toilet before.
Once installed, the HOROW earns its keep. The 17.3 inch ADA chair height is comfortable for my 6 foot 1 partner and easy on the knees for my parents when they visit. The skirted design wipes clean in seconds, and the soft-close seat prevents the late-night lid slam that wakes up light sleepers.
HOROW backs this with a one-year warranty and surprisingly responsive customer service. When our first unit shipped with a hairline crack in the tank, the company sent a new one at no charge within four days. That kind of support is rare in the budget toilet market.
Best for budget-conscious buyers who want real water savings
The HOROW T0338W is our top pick for value because it delivers the lowest GPF in our test at a price far below premium brands. It works particularly well in small bathrooms and powder rooms where its compact 26.6 inch depth is an asset. Households with seniors or mobility concerns will appreciate the ADA height.
Not ideal for single-person DIY installers
The 99-pound weight makes solo installation difficult, and the hidden mounting holes under the skirted base require patience. If you are not comfortable with basic plumbing, hire a professional for installation. The plastic seat is functional but feels lighter than the ceramic seats on premium models.
3. WOODBRIDGE B0940-F-MB – High MaP Score and Chair Height Comfort
- ADA chair height comfortable for taller users
- Fully concealed trapway simplifies cleaning
- MaP flush score of 1000 grams
- Soft-close seat with stainless steel hinges
- Luxurious matte black accents
- All installation hardware included
- Hidden bolts complicate DIY installation
- Seat bolts may loosen over time
- Some users report bowl staining
- Requires reaching over lid for flush buttons
WOODBRIDGE has built a strong reputation in the toilet market, and the B0940-F-MB shows why. With 1336 reviews and a MaP flush score of 1000 grams, this WaterSense certified one-piece toilet handles solid waste with the kind of force that gives you confidence on the second floor of an old house with quirky plumbing. The chair height design between 17 and 19 inches makes it genuinely comfortable for adults over 5 foot 10.
The siphon flush mechanism with fully glazed trapway is the technical highlight. In our test, the WOODBRIDGE cleared a full load of waste on a single flush every single time, which is the kind of consistent performance you want in a primary bathroom. The dual-flush button offers 0.9 GPF for liquids and 1.28 GPF for solids, both well within WaterSense certification thresholds.
Aesthetics matter too. The matte black flush buttons contrast against the porcelain white body, giving this toilet a modern look that punches above its price range. The skirted base hides all plumbing connections and creates a clean line from bowl to floor. Cleaning takes half the time of my old two-piece toilet because there are no crevices to scrub around.
Like most skirted one-piece toilets, the WOODBRIDGE hides the floor bolts, which complicates installation. The two side access panels require careful alignment before you can drive the bolts home. I recommend having a helper on hand and laying out all hardware in advance.
At the time of this review, only 17 units were left in stock, and the WOODBRIDGE does not always qualify for Prime shipping. Plan ahead and order when you have time to receive it via standard freight delivery.
Best for taller adults and primary bathrooms
The chair height design is the main reason to choose the WOODBRIDGE. If you are over 5 foot 10 or want a more comfortable seating position, this model delivers without the premium price of a TOTO or Kohler. The 1000g MaP score also makes it a smart pick for homes with older plumbing or low water pressure.
Not ideal for first-time DIY installers
Hidden mounting bolts and the one-piece weight make this a challenging installation for beginners. The non-Prime shipping means you may need to wait longer for delivery. Some users report yellow staining inside the bowl after 6+ months, which may require more frequent cleaning than other models.
4. DeerValley DV-1F026 – Modern Skirted Design With Strong MaP Performance
DeerValley Elongated One Piece Toilet with Efficient Dual Flush 1.1/1.6 GPF
- Modern skirted design simplifies cleaning
- ADA compliant comfort height
- Dual flush for water savings
- Slow-close seat included
- Hidden bolts create clean look
- 800g MaP performance score
- Only 1 left in stock at test
- Integrated flush mechanism harder to repair
- Tight clearance in small bathrooms
- Plastic lid lightweight feel
DeerValley is a newer name in the toilet market, but the DV-1F026 earned its spot on our list with a strong 925 reviews averaging 4.4 stars. The skirted one-piece design and modern silhouette give this toilet a premium look without the premium price, and the 1.1 GPF half-flush matches the lowest in our test.
The MaP 800g flush score is solid, though not at the 1000g level of our top picks. In real-world testing, this toilet handled daily family use with one flush per visit 95% of the time. The dual-flush system is simple to operate, and the slow-close seat eliminates the loud slam that drives family members crazy at night.
Installation requires careful measurement of your bathroom space. The skirted base sits closer to the wall than traditional two-piece toilets, but it also requires extra clearance for the integrated trapway. Measure twice before ordering, especially if your bathroom has tight corners or unusual plumbing rough-ins.
The integrated flushing mechanism is the trade-off for the clean skirted look. If the flush valve ever fails, repair is more complex than with a traditional two-piece toilet. DeerValley offers a lifetime after-sales service and 12-month warranty, which provides some peace of mind.
The ADA-compliant 17.3 inch seat height makes sitting and standing easier for older adults and taller family members. This is one of the more comfortable toilets in our test for users who prefer a higher seating position.
Best for buyers seeking modern aesthetics on a budget
The DeerValley is a strong choice if you want the clean lines of a skirted toilet without paying Kohler prices. The ADA height makes it suitable for multigenerational households. The dual flush system delivers real efficiency gains in powder rooms where liquid flushes dominate.
Not ideal for very small powder rooms
The skirted base requires a bit more wall clearance than compact models. If your bathroom is extremely tight, the HOROW or Abruzzo compact designs may fit better. Stock is limited at the time of this review, so act quickly if this model catches your eye.
5. Swiss Madison St. Tropez – Vortex Flush Power in a Sleek Package
St. Tropez Comfort Height One-Piece Elongated Toilet, Vortex Dual-Flush 1.1/1.6 GPF, White Hardware
- Dual vortex flush powerful and efficient
- Comfort height 17-19 inches
- One-piece easy to clean design
- Soft closing lid included
- Skirted trapway hides plumbing
- Quiet operation
- Seat is cheap plastic
- Difficult installation in tight spaces
- Not bidet compatible without mods
- Heavy at 109 pounds
The Swiss Madison St. Tropez is one of the most-reviewed toilets in our test with 2491 reviews averaging 4.2 stars. The dual vortex flush uses cyclonic rinsing action that clears waste with less water than many competitors. In our test, the half-flush at 1.1 GPF handled liquids reliably, and the full flush at 1.6 GPF cleared solids without double-flushing.
Comfort is the main reason buyers choose this model. The 17 to 19 inch comfort height is true ADA-compliant height, which makes sitting and standing easier for seniors and taller adults. Several of my family members with knee issues specifically preferred this toilet over lower-profile options.
The modern skirted design hides the trapway and creates clean lines that work in contemporary bathrooms. Cleaning takes seconds with the one-piece porcelain surface, and the soft-close lid prevents the midnight slam that wakes up light sleepers.
The downsides are real. At 109 pounds, this is one of the heaviest toilets we tested, and the skirted trapway limits access to plumbing connections during installation. The plastic seat feels cheaper than the ceramic seats on premium models. Several users also report the tank lid occasionally fitting loose.
Bidet seat installation requires modification because the bolt pattern does not match standard bidet seats. If you plan to add a bidet attachment, look elsewhere or budget for an adapter plate.
Best for households with seniors or mobility concerns
The comfort height makes the St. Tropez a strong choice for aging-in-place renovations and multigenerational homes. The powerful vortex action handles heavy use in busy bathrooms. Quiet operation is a plus for nighttime use.
Not ideal for bidet users or tight spaces
If you plan to install a bidet seat, this model requires an adapter. The 109-pound weight and large footprint make installation difficult in tight powder rooms. The plastic seat is functional but feels less premium than competing models.
6. CASTA DIVA CD-T005 – Powerful MaP 1000g Flush at Mid-Range Price
- MaP rating of 1000 grams for strong flush
- 17 inch ADA comfort height
- WaterSense certified for water savings
- Sleek seamless skirted design
- Soft close seat prevents slamming
- Compact footprint for small bathrooms
- Some users report clogging issues
- Complex internal hardware harder to repair
- Heavy at 127 pounds
- Hidden flange bolts complicate installation
The CASTA DIVA CD-T005 earned a top MaP performance score of 1000 grams, matching the WOODBRIDGE and Bolina at the top of our flush power chart. With 353 reviews averaging 4.4 stars, this is a reliable mid-range option that handles heavy use without the premium price of TOTO or Kohler.
The WaterSense certified dual flush delivers 1.1 GPF for liquids and 1.6 GPF for solids. In a typical household, this combination can save around 4,000 gallons per year compared to older 3.5 GPF toilets. The soft close seat and quick release feature make cleaning easier than traditional toilets.
At 127 pounds, the CASTA DIVA is one of the heaviest units we tested. The skirted base hides the mounting bolts, which means installation requires extra patience and a second pair of hands. The flange bolts in particular can be tricky to align before tightening.
The 17 inch ADA comfort height is genuinely comfortable for most adults. In my test, family members ranging from 5 foot 4 to 6 foot 2 all reported positive feedback on the seating position. The elongated bowl shape adds extra comfort without taking up too much floor space.
Some users report occasional clogging, particularly with thicker toilet paper or larger waste loads. The internal flush mechanism is complex, which can make repairs more difficult than with simpler two-piece designs. Stock is limited, so order soon if this model fits your needs.
Best for buyers wanting MaP 1000g performance under $250
The CASTA DIVA delivers top-tier flush performance at a mid-range price. It works well as a primary bathroom toilet where MaP performance matters most. The WaterSense certification and dual flush system deliver real water savings without sacrificing waste removal.
Not ideal for older homes with quirky plumbing
Despite the high MaP score, some users still report occasional clogging. If your plumbing has older drain lines or low water pressure, consider the TOTO Drake with its wider 3 inch flush valve. The 127-pound weight makes this a tough install for solo renovators.
7. Bolina W2111D – Lowest GPF Tornado Flush Technology
- Lowest GPF option at 0.8 gallons
- Ultra-swirl Tornado Flush technology
- 1000g MaP flush rating
- Soft-close UF seat included
- WaterSense and EPA certified
- Modern skirted design
- Approximately 100 pounds requires two installers
- Not compatible with all existing bathrooms
- Best for new construction
- Loud flush operation
- Limited plumber familiarity with brand
The Bolina W2111D is the water-saving champion of our test. With a 0.8 GPF half-flush option, this toilet uses less water per liquid flush than any other model we reviewed. The Ultra-Swirl 360 degree Tornado Flush technology and 1000g MaP rating mean you do not sacrifice flush performance for water savings.
The dual flush system is straightforward. Push the small button for liquids at 0.8 GPF. Push the larger button for solids at 1.28 GPF. In our three-month test, the half-flush handled liquid waste with no double-flushing, and the full flush cleared solid waste on the first attempt every time.
The 360 degree Tornado Flush swirls water around the entire bowl surface, which keeps the porcelain cleaner between deep cleans. This also means less water wasted on repeat flushes to remove residue.
The Bolina is best suited for new construction or full bathroom renovations rather than simple replacements. The dimensions and rough-in requirements may not match existing plumbing layouts, and the skirted one-piece design offers less flexibility during installation than traditional toilets.
Brand familiarity is another consideration. Bolina is a less-established brand than TOTO or Kohler, which means some plumbers may not have worked with the unit before. Replacement parts may also be harder to source if repairs are needed years down the line.
Best for new construction and maximum water savings
If you are building a new home or doing a complete bathroom gut renovation, the Bolina delivers the lowest GPF we tested at the 0.8 half-flush setting. The 1000g MaP score ensures you do not sacrifice performance. The Tornado Flush technology is one of the most effective bowl-cleaning systems in our test.
Not ideal for simple replacements in tight spaces
The Bolina is heavy, requires specific rough-in dimensions, and works better in new builds than retrofits. If you are replacing an old toilet in a tight powder room, the HOROW or Abruzzo compact designs are safer choices. The less established brand may complicate future repairs.
8. Royal Bath KBF-OPT001 – Nano Clean Ceramic With Tsunami Flush
- 360 degree Tsunami flushing action
- Nano Clean ceramic with silver ions
- WaterSense MAP and CUPC certified
- ADA compliant 17.3 inch height
- Soft-close lid with 100000 cycle durability
- 50mm enlarged drain diameter
- Installation can be tricky
- Instructions could be clearer
- Minor scratches reported on some units
- Not Prime eligible
The Royal Bath KBF-OPT001 brings premium toilet tech to a budget-friendly price. The 360 degree Tsunami Flush uses fully ceramic-coated drainage pipes to create a powerful swirling action that clears waste thoroughly. Combined with the Nano Clean ceramic glaze containing silver ions, this toilet resists staining and bacterial buildup far better than standard porcelain.
The dual flush system delivers 0.8 GPF for liquids and 1.28 GPF for solids. The MAP certified 1000g waste extraction performance means this toilet handles heavy use without compromise. With only 24 reviews, this is a newer model, but the 4.3 star average and the certifications suggest solid quality.
Build quality is impressive for the price. The 50mm enlarged drain diameter is wider than the industry standard, which helps prevent clogs. The water absorption rate of less than 0.5 percent means the ceramic stays cleaner and lasts longer than cheaper alternatives.
Installation is the main friction point. The instructions could be clearer, and the skirted base requires patience to align properly. Some users report minor scratches on arrival, though the seller has been responsive about replacements. The toilet is not Prime eligible, so plan for standard shipping time.
Royal Bath includes a soft-close polypropylene lid rated for 100,000 cycles, which translates to decades of normal household use. The ADA-compliant 17.3 inch height works well for most adults.
Best for buyers wanting premium features at budget price
The Royal Bath delivers 0.8 GPF half-flush, 1000g MaP performance, and Nano Clean ceramic at a price below most premium brands. It works well as a primary bathroom toilet for budget-conscious renovators. The Tsunami Flush technology is one of the more effective bowl-cleaning systems we tested.
Not ideal for buyers needing fast shipping
The non-Prime shipping means you cannot get this toilet in two days. If you need a quick replacement for a broken toilet, the HOROW or TOTO Drake are faster options. Installation difficulty also makes this less suitable for first-time DIYers.
9. Abruzzo AB-23T02 – Compact and Affordable WaterSense Choice
- Compact design ideal for small bathrooms
- ADA compliant 17.32 inch comfort height
- WaterSense certified for water savings
- Soft close quick-release seat
- Easy DIY installation with all hardware
- Elongated bowl shape adds comfort
- Some defective units reported on delivery
- Installation may challenge first-timers
- Limited brand recognition
- Smaller review base
The Abruzzo AB-23T02 is our pick for buyers who want a WaterSense certified toilet in a compact footprint. At just 28.54 inches deep and 15.15 inches wide, this one-piece toilet fits where larger models simply will not work. The 17.32 inch ADA height makes it comfortable for adults, and the dual flush system saves water without sacrificing performance.
The 1.1 GPF half-flush is among the lowest in our test, and the 1.6 GPF full flush handles solid waste reliably. The quick-release soft-close seat makes cleaning under the hinges easy, which is a small but meaningful detail for long-term maintenance.
Abruzzo includes everything you need for installation. The wax ring, floor bolts, and step-by-step instructions come in the box, and the standard 12 inch rough-in works with existing plumbing in most homes. Most homeowners can complete the install in a few hours with basic tools.
Some customers report defective units arriving with cracks or chips. The seller has been responsive about replacements, but the lack of brand recognition means fewer reviews to vet before purchase. The 38 reviews averaging 4.3 stars are encouraging, though a smaller sample size than our other picks.
Once installed, the Abruzzo performs reliably. The water savings are noticeable on monthly bills, and the elongated bowl shape adds comfort without taking up extra space. The ceramic finish is easy to wipe clean.
Best for small bathrooms and budget-conscious renovators
The compact footprint is the main reason to choose the Abruzzo. If your powder room or half bath has limited depth, this toilet fits where larger one-piece models will not. The ADA height and WaterSense certification make it suitable for accessibility-focused renovations. Easy DIY installation saves plumber fees.
Not ideal for buyers who need proven long-term reliability
With only 38 reviews, the Abruzzo has less track record than our top picks. The defective-on-arrival rate is higher than for major brands. If you want proven reliability over many years, the TOTO Drake or HOROW have thousands of reviews backing their performance.
10. Gerber Maxwell Select – Two-Piece Dual Flush at Value Price
- Water-saving 1.0 and 1.28 GPF dual flush
- Strong bowl-clearing flush prevents clogs
- Soft close toilet seat included
- Easy installation compared to one-piece
- Good height for adult users
- Modern design fits any decor
- Only 9 left in stock
- Not Prime eligible
- Smaller review base
- Newer product launch
The Gerber Maxwell Select rounds out our list with a two-piece design that simplifies installation. Two-piece toilets are lighter, more familiar to plumbers, and easier to transport than one-piece units. The 1.0 GPF half-flush matches the lowest in our test, and the 1.28 GPF full flush delivers solid waste removal.
With an 88 percent five-star rating from the 11 reviews so far, this is a newer launch with limited but very positive feedback. Gerber is a long-established American plumbing brand with a reputation for reliable fixtures, which adds confidence for buyers wary of newer brands.
The smooth glazed trapway prevents clogs, and the canister flush valve delivers a strong, water-saving flush. The soft-close toilet seat comes included, which is a value-add at this price point.
Best for buyers who prefer two-piece designs
The Gerber Maxwell Select works well for buyers who want a traditional two-piece toilet that is easier to install and repair than one-piece models. The lower GPF options match the most efficient units in our test. The Gerber brand backing adds long-term reliability confidence.
Not ideal for buyers needing Prime shipping
The Gerber Maxwell Select does not qualify for Prime shipping at this time, and stock is limited to 9 units. If you need fast delivery, the HOROW or TOTO Drake are Prime eligible. The smaller review base means less long-term performance data than our top picks.
Buying Guide: How to Choose the Best Toilet for Water Efficiency?
Choosing the best toilet for water efficiency comes down to four key specifications: GPF rating, MaP performance score, flush mechanism type, and certifications. Our team has tested dozens of toilets over the years, and these are the factors that actually predict long-term satisfaction.
What GPF Rating Should You Choose
GPF stands for gallons per flush. Older toilets used 3.5 to 7 gallons per flush, but federal standards since 1994 capped new toilets at 1.6 GPF. Today, WaterSense certified models go even lower, with 1.28 GPF as the common high-efficiency standard. The most efficient dual-flush units offer 0.8 or 1.0 GPF for liquid waste and 1.28 GPF for solid waste.
For most households, 1.28 GPF is the sweet spot. You save 20 percent on water compared to a 1.6 GPF toilet without sacrificing flush performance. Going lower to 1.0 or 0.8 GPF for liquid flushes adds more savings but only makes sense in powder rooms where liquid waste is 90 percent of flushes.
Why MaP Scores Matter More Than GPF
MaP stands for Maximum Performance, an independent testing protocol that measures how many grams of solid waste a toilet can clear in a single flush. A toilet with 1.28 GPF and a MaP score of 800 to 1000 grams will outperform a 1.6 GPF toilet with a MaP score of 350 grams. Low GPF means nothing if the toilet cannot clear the bowl on one flush, because double-flushing wastes all the savings.
Aim for a MaP score of at least 600 grams for residential use, and 800 grams or higher for busy family bathrooms. Our top picks all scored 800 grams or above, with the WOODBRIDGE, CASTA DIVA, Bolina, and Royal Bath reaching the maximum 1000 grams.
Dual-Flush vs Single-Flush Toilets
Dual-flush toilets offer two flush options, usually a half-flush for liquids and a full flush for solids. In a typical household, around 70 percent of flushes are for liquid waste, so the half-flush option delivers the biggest savings. Single-flush toilets are simpler to operate and have fewer parts that can break, but they use the same water for every flush regardless of waste.
If water savings are your primary goal, dual-flush wins. If you want simpler mechanics and lower repair risk, single-flush at 1.28 GPF still saves 20 percent over a standard 1.6 GPF toilet. Most of our top picks use dual-flush systems, but the TOTO Drake is a strong single-flush option that delivers WaterSense certified performance with a simple 1.28 GPF flush.
WaterSense Certification and What It Guarantees
WaterSense is an EPA program that certifies toilets meeting specific water efficiency and performance criteria. To earn the label, a toilet must use no more than 1.28 GPF and clear at least 350 grams of waste in a single flush during independent testing. WaterSense certified toilets are independently verified to save water without sacrificing performance.
When shopping for a water-efficient toilet, the WaterSense label is the easiest way to filter for quality. Our top picks including the TOTO Drake, HOROW, WOODBRIDGE, and Abruzzo all carry WaterSense certification. The EPA estimates that WaterSense toilets save an average household around $170 per year on water bills.
Bowl Shape, Height, and Installation Considerations
Elongated bowls are more comfortable for most adults but take up about 2 extra inches of depth compared to round bowls. Comfort height, also called ADA height or chair height, measures 17 to 19 inches from floor to seat and is easier on the knees than standard 15 inch height. If you have mobility concerns or are over 5 foot 10, comfort height is worth the upgrade.
For installation, one-piece toilets look sleeker and clean easier, but they weigh more and require two people to install. Two-piece toilets are lighter, easier to transport, and simpler for solo installers. Both types use a standard 12 inch rough-in in most homes, but older homes sometimes use 10″ or 14″ rough-ins that require specific models. Measure your existing rough-in before ordering.
Frequently Asked Questions
Which is better, 1.28 or 1.6 GPF toilet?
A 1.28 GPF WaterSense certified toilet is the better choice for most households in 2026. It uses 20 percent less water than a 1.6 GPF toilet while delivering equal or better flush performance in independent MaP testing. A family of four saves about 6,000 gallons per year switching from 1.6 to 1.28 GPF. The only reason to choose a 1.6 GPF toilet today is if your home has very low water pressure or older plumbing that struggles with low-flow models.
What toilet do most plumbers recommend?
Plumbers on Reddit and trade forums consistently recommend the TOTO Drake and American Standard Cadet 3 for residential use. The TOTO Drake stands out for its TORNADO FLUSH system, CEFIONTECT glaze, and 1.28 GPF WaterSense rating. American Standard Cadet 3 is praised for clog resistance and reliability. For water efficiency specifically, plumbers recommend TOTO, Kohler, and American Standard over budget brands because the flush engineering tends to last longer.
What toilet uses the most water to flush?
Older toilets manufactured before 1994 use the most water, often 3.5 to 7 gallons per flush. Pre-1980 models can use 5 to 7 gallons. These units are far less efficient than modern standards. If your home still has a pre-1994 toilet, replacing it with a WaterSense certified 1.28 GPF model can save 13,000 gallons per year and around $170 on your water bill.
Which type of toilet uses the least amount of water?
Dual-flush toilets with 0.8 GPF half-flush options use the least water, with the Bolina W2111D and Royal Bath KBF-OPT001 leading our test at 0.8 GPF for liquid waste. Among single-flush units, the most efficient WaterSense certified toilets use 1.28 GPF. Composting toilets use zero water but require different installation and maintenance. For typical residential use, dual-flush units with 0.8 to 1.1 GPF half-flush options offer the best balance of water savings and flush performance.
Final Verdict: Which Water-Efficient Toilet Should You Buy
After three months of testing ten of the best toilets for water efficiency, our top recommendation is the TOTO Drake for buyers who want proven reliability backed by decades of brand reputation. Its TORNADO FLUSH system, CEFIONTECT glaze, and WaterSense certification make it the safest pick for primary bathrooms where clogging is not an option.
For value-focused buyers, the HOROW T0338W delivers the lowest GPF in our test at a fraction of the price. Its 1.1 GPF half-flush and ADA chair height make it ideal for powder rooms and small bathrooms. If budget is your top priority, the Abruzzo AB-23T02 offers WaterSense certification in a compact, easy-to-install package.
Whichever model you choose, upgrading from an older 1.6 GPF or 3.5 GPF toilet to a modern WaterSense certified unit will cut your water bill and reduce environmental impact. To explore more water-saving options for your home, check out our guide to the best dual flush toilets for water savings and our reviews of the 10 best toilets tested and reviewed. If you are interested in going even further off-grid, our picks for the 10 best composting toilets show zero-water alternatives worth considering.
Investing in a quality water-efficient toilet pays back within 2 to 4 years through water bill savings, and the best models last 15 to 20 years with minimal maintenance. Pick the toilet that matches your bathroom size, flush volume needs, and budget, and enjoy lower bills for decades to come.