Flushing Power

Best 1000 Gram MaP Toilets (Maximum Flush Rating)

A 1,000-gram MaP score is the highest rating the independent Maximum Performance flush test awards, meaning the toilet cleared a full kilogram of solid waste in a single flush. Every toilet on this list has earned that ceiling score, so the ranking comes down to the tie-breakers that decide real-world performance: water efficiency, flush valve size, trapway width, bowl height and aggregated owner reviews.

Why Trust Best Flushing Toilets

Flushing power and MaP flush-test scores
Water efficiency (GPF and EPA WaterSense)
Aggregated owner reviews
Clog resistance and trapway design
Brand reliability and warranty

Research updated June 2026.

Quick Answer

The best 1,000-gram MaP toilet overall is the TOTO Drake. It reaches the maximum 1,000-gram MaP rating at just 1.28 gallons per flush, holds EPA WaterSense certification, and uses parts stocked in every hardware store. For raw gravity force, the American Standard Champion 4 matches that ceiling with a 4-inch valve.

If you have spent any time researching toilets, you have run into the number 1,000 and wondered whether it is marketing or measurement. It is measurement. A 1,000-gram MaP score is the single highest rating the Maximum Performance flush test will award, and a toilet earns it only by clearing a full kilogram of solid waste media in one flush. That is more than any normal household will ever push through a toilet in a single use, which is exactly why the rating exists as a ceiling rather than an open-ended scale. When a toilet hits 1,000 grams, the test stops, because there is nothing left to prove.

This guide collects the real toilets that have earned that maximum rating and ranks them on everything that separates them once the headline number is identical. The MaP test, run independently since 2003, drops standardized weighted soybean-paste media into a toilet and records the largest load it clears cleanly in a single flush. Hundreds of models score in the 400 to 600 gram range, a smaller group reaches 800, and only a select set hit the 1,000-gram maximum. We cross-reference each 1,000-gram score against EPA WaterSense status, flush valve diameter, trapway width and the pattern of aggregated owner reviews, so you can pick the right maximum-rated toilet for your bathroom rather than just the first one you find. For the full category overview, start with our pillar guide to the best flushing toilets.

How we research and rank. We do not test toilets in a lab and we never claim to. Our rankings compare published manufacturer specifications, third-party MaP flush-test scores, EPA WaterSense certification status and the pattern of aggregated owner reviews across major retailers. Because every toilet here already holds the maximum 1,000-gram MaP score, we rank them on water efficiency first, then flush valve and trapway design, then parts availability, value and owner satisfaction.

What Is a 1000 Gram MaP Score?

A 1,000-gram MaP score is the maximum rating awarded by the independent Maximum Performance flush test, meaning the toilet cleared 1,000 grams of solid waste media in a single flush. The test does not rate higher than 1,000 grams because no realistic household load exceeds it. A toilet with this score is effectively clog-proof in everyday use.

The MaP test starts with a small load of weighted media and increases the weight in steps until a toilet fails to clear it completely in one flush. The largest weight it clears becomes its score. Many toilets on the market today land between 400 and 600 grams, which is adequate, while 800 grams is genuinely strong. The 1,000-gram mark is the published ceiling, and reaching it means the toilet demonstrated more clearing capacity than a person ever produces in one sitting. That headroom is the entire point: a toilet with maximum rating clears any realistic load with so much margin that a second flush or a plunger becomes a rarity.

At a glance

Best 1000-gram MaP toilets compared

Nine real models that all earn the maximum 1,000-gram MaP score, sorted by water efficiency, flush valve size and value, then balanced against bowl height and aggregated owner reviews.

Toilet	Best For	MaP	GPF	Flush valve	Rating	Check Price
TOTO Drake	Best overall	1,000 g	1.28	3 in	4.7	Check price
American Standard Champion 4	Raw gravity force	1,000 g	1.6	4 in	4.6	Check price
Gerber Avalanche	Best value	1,000 g	1.28	3 in	4.4	Check price
Kohler Cimarron	Best 360-degree rinse	1,000 g	1.28	3.25 in	4.5	Check price
American Standard Cadet 3	Best big-box pick	1,000 g	1.28	3 in	4.5	Check price
Woodbridge T-0019	Best one-piece	1,000 g	1.28	3 in	4.5	Check price
Kohler Highline	Best mainstream gravity	1,000 g	1.6	3.25 in	4.6	Check price
Swiss Madison St. Tropez	Best modern look	1,000 g	1.28	3 in	4.3	Check price
Gerber Viper	Best budget two-piece	1,000 g	1.28	3 in	4.4	Check price

Which 1000 Gram MaP Toilet Is Best Overall?

The TOTO Drake is the best 1,000-gram MaP toilet overall because it pairs the maximum flush rating with EPA WaterSense efficiency at just 1.28 gallons per flush and universal, easy-to-find parts. Its G-Max siphon-jet flush has a decades-long track record of reliability. The American Standard Champion 4 is the alternative for buyers who want maximum raw gravity force.

When two toilets both score 1,000 grams, the meaningful question is what each one costs you over years of ownership. The TOTO Drake wins that comparison because it delivers maximum clearing power while using a fifth less water than a 1.6-gallon toilet, and because its parts are stocked everywhere, so a worn flapper or fill valve is a few-dollar fix rather than a special order. The Champion 4 hits the same ceiling with more brute force from its oversized 4-inch valve, which is the right pick for a home that battles chronic clogs, but it uses 1.6 gallons and a proprietary flapper. For most bathrooms, the Drake is the smarter maximum-rated buy.

Does a 1000 Gram MaP Toilet Use More Water?

No. Most 1,000-gram MaP toilets sold today, including the TOTO Drake, American Standard Cadet 3, Kohler Cimarron and Gerber Avalanche, use only 1.28 gallons per flush and carry EPA WaterSense certification. Modern bowl and valve engineering means the maximum flush rating and the lowest water use can now exist in the same toilet, so you no longer trade efficiency for power.

For decades the assumption was that a stronger flush required more water, and that was true when 3.5-gallon and 1.6-gallon toilets were the only options. That link is now broken. Engineers redesigned bowl geometry, jet placement and flush-valve flow so that a precisely directed 1.28-gallon flush clears as much as an old water-guzzler. Seven of the nine toilets on this list reach 1,000 grams at 1.28 gallons, and only the Champion 4 and the standard Kohler Highline still use 1.6 gallons. Unless you specifically want the extra volume for a chronic-clog bathroom, a WaterSense 1.28-gallon model gives you maximum rating and lower water bills at the same time.

Which 1000 Gram MaP Toilet Is the Best Value?

The Gerber Viper and Gerber Avalanche offer the best value among 1,000-gram MaP toilets, delivering the maximum flush rating at 1.28 gallons for a plumber-grade cost without the showroom markup. Among premium brands, the TOTO Drake is the best value because its parts are cheap and universal, keeping long-term ownership costs low.

Value on a maximum-rated toilet is not just the sticker, it is the total cost over the toilet's life. Gerber is a plumber-favored brand that reaches the 1,000-gram ceiling without the design premium the showroom names charge, which is why both the Viper and Avalanche are such strong value picks. On the premium side, the value argument shifts to parts: a TOTO Drake or American Standard Cadet 3 keeps flappers, fill valves and seats on every hardware-store shelf for years, so you avoid the proprietary-part trap that makes a cheaper toilet expensive to maintain. The worst value is a maximum-rated toilet whose replacement parts you cannot find. To weigh power against everyday cost across categories, see our guide to the best toilet for heavy waste.

Top picks

The 9 best 1000-gram MaP toilets

Every pick below already holds the maximum 1,000-gram MaP score, so they are ranked on water efficiency, flush design, parts availability and value, cross-checked against aggregated owner reviews.

Best overall

TOTO Drake

4.7 Best for: power plus efficiency

The Drake is the toilet that proves a maximum 1,000-gram MaP rating does not require a thirsty 1.6-gallon flush, reaching the ceiling at just 1.28 gallons while holding EPA WaterSense certification. It is the most copied strong-flush design in the industry for a reason: it simply works, year after year.

Flush TypeG-Max siphon jet

GPF1.28

MaP Score1,000 g

Bowl Height16.125 in (universal)

Warranty1-year limited

Best For

Maximum 1,000-gram clearing power at only 1.28 gallons
EPA WaterSense certified, so it saves water without losing strength
Cheap, universal parts stocked in every hardware store

Not Ideal For

Buyers who want a tall 17-inch-plus comfort height from the box
Anyone who prefers a skirted, seam-free body to clean

The Drake's G-Max system channels water through a wide 3-inch flush valve and a jet at the base of the bowl, creating a fast, deep siphon that pulls the load down and out in one decisive motion. That siphon is what earns the maximum MaP rating, and it does so quietly compared with a pressure-assisted unit.

Owner reviews are unusually consistent across many years, with the recurring themes being a flush that never seems to quit and parts that are effortless to find. The standard model sits at a universal 16.125-inch height; for a taller comfort-height seat with the same maximum rating, the Drake II steps up. It is also a top pick in our roundup of the strongest flushing toilets of 2026.

Expert Take

This is the default recommendation for anyone who wants the maximum flush rating without wasting water. You get 1,000-gram clearing power at 1.28 gallons, a flush design with a decades-long record, and replacement parts on every shelf. For most homes it is the smarter buy than any 1.6-gallon toilet with the same score.

Check price on Amazon

Bottom Line: The best maximum-rated toilet overall, pairing 1,000-gram clearing power with low water use and bulletproof parts availability.

Raw gravity force

American Standard Champion 4

4.6 Best for: chronic clog homes

The Champion 4 reaches the maximum 1,000-gram MaP rating through sheer gravity force, carrying the largest flush valve in the residential market at 4 inches and the widest trapway here at 2-3/8 inches. American Standard built it specifically to be the toilet you install when nothing else stops the clogging.

Flush TypeTower-valve gravity

GPF1.6

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty10-year limited

Best For

Widest trapway and largest valve here, so clogs are extremely rare
Maximum 1,000-gram MaP score with a fast, heavy gravity flush
Long 10-year limited warranty and EverClean glazed surface

Not Ideal For

Water-conscious buyers, since it uses a full 1.6 gallons per flush
Anyone who needs a generic flapper, as it uses a proprietary part

The 4-inch tower valve releases nearly the entire tank into the bowl in a fraction of a second, creating a hard, fast flush, while the oversized glazed trapway carries the load out with room to spare. That combination is why the Champion 4 has a reputation among plumbers as the heaviest-hitting gravity toilet in its class.

The trade-off is water, since it uses 1.6 gallons and is not WaterSense certified, drawing more than the 1.28-gallon picks on this list. It also uses a proprietary flapper, so keeping a spare on the shelf is wise. Owner reviews are strongly positive on flush power, with the main recurring complaint being that proprietary part. For a home that values never touching a plunger over a slightly higher water bill, it is an easy trade backed by a 10-year warranty.

Expert Take

Buy this if your single goal is the most forceful gravity flush at the maximum rating, especially in a bathroom that has fought clogs for years. Keep one proprietary flapper in the cabinet, accept the 1.6-gallon water use, and it will outmuscle almost anything in its class for a decade.

Check price on Amazon

Bottom Line: The maximum-rated toilet with the most raw gravity force, ideal for chronic-clog homes that can accept higher water use.

Best value

Gerber Avalanche

4.4 Best for: budget power

The Avalanche is the proof that a maximum 1,000-gram MaP rating does not require a premium-brand price. Gerber is a plumber-trusted name that delivers the same ceiling score at 1.28 gallons with EPA WaterSense certification, usually for less than the showroom equivalents.

Flush TypeGravity siphon jet

GPF1.28

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty5-year limited

Best For

Maximum 1,000-gram MaP score at 1.28 gallons on a budget
Comfort-height bowl and EPA WaterSense certification
Plumber-grade reliability without the premium-brand markup

Not Ideal For

Buyers who want the widest showroom-brand parts network
Anyone set on a name-brand badge for resale appeal

The Avalanche uses a conventional gravity siphon-jet flush tuned to clear the maximum rated load while staying efficient. It is the kind of toilet plumbers install in rental units and family homes precisely because it flushes hard and rarely calls them back.

Owner reviews praise the flush power and the price, with the main caveat being that Gerber parts, while reliable, are not stocked quite as widely as TOTO or Kohler. Noting the model number for future service handles that easily. For a buyer who wants maximum clearing power per dollar, the Avalanche is the standout. Compare brands directly in our look at heavy-waste flushing.

Expert Take

If budget is the deciding factor but you refuse to give up the maximum flush rating, this is the pick. You get a 1,000-gram WaterSense toilet at a price the premium brands cannot match, with comfort height included. Just record the model number so future parts are quick to source.

Check price on Amazon

Bottom Line: The best value at the maximum rating, delivering 1,000-gram power and WaterSense efficiency for a plumber-grade price.

Best 360-degree rinse

Kohler Cimarron

4.5 Best for: clean bowl

The Cimarron reaches the maximum 1,000-gram MaP rating while using Kohler's AquaPiston canister and a 360-degree rinse that washes the entire bowl on every flush. It is the maximum-rated pick for buyers who care about cleanliness as much as raw clearing.

Flush TypeAquaPiston canister

GPF1.28

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty1-year limited

Best For

Maximum 1,000-gram MaP score with a 360-degree bowl rinse
AquaPiston canister has no flapper to warp, reducing leaks
Comfort height and EPA WaterSense at 1.28 gallons

Not Ideal For

Buyers who want a wider 3.5-inch-plus flush valve
Anyone who finds the canister rebuild less familiar than a flapper

Instead of a flapper, the Cimarron uses a canister valve that lifts straight up, exposing a larger opening and feeding water 360 degrees around the rim. That even distribution cleans the bowl thoroughly while the 1.28-gallon flush still clears the maximum rated load, a combination Kohler tuned carefully.

Owner reviews highlight the clean bowl and the leak-resistant canister, since there is no flapper to warp and start running. The flip side is that the canister seal, while long-lived, is a slightly less familiar repair than swapping a flapper. For a buyer who wants the maximum rating and a spotless bowl, the Cimarron is the natural choice.

Expert Take

Choose the Cimarron when a clean bowl and a leak-proof valve matter as much as the maximum flush rating. The 360-degree rinse keeps the bowl tidy between cleanings, and the canister design sidesteps the most common cause of a running toilet. It is the refined pick at the 1,000-gram ceiling.

Check price on Amazon

Bottom Line: A maximum-rated toilet that adds a 360-degree rinse and a leak-resistant canister valve to the 1,000-gram flush.

Best big-box pick

American Standard Cadet 3

4.5 Best for: easy availability

The Cadet 3 reaches the maximum 1,000-gram MaP rating at 1.28 gallons and is one of the easiest maximum-rated toilets to actually buy, stocked on the floor and the shelf at major home centers nationwide. It is the practical choice when you want the ceiling score without a special order.

Flush TypePowerWash siphon

GPF1.28

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty10-year limited

Best For

Maximum 1,000-gram MaP score at 1.28 gallons
PowerWash rim scrubs the bowl on every flush
Widely stocked with a long 10-year warranty

Not Ideal For

Buyers who want a 4-inch valve like the Champion 4
Anyone seeking a one-piece, seamless body

The Cadet 3 uses American Standard's PowerWash rim, which directs water around the bowl to scrub it while the siphon clears the load, reaching the maximum rating with a clean finish. It is the workhorse of the American Standard lineup, balancing power, efficiency and price.

Owner reviews are steady and positive, with the recurring theme being a strong, reliable flush and parts you can grab anywhere. It does not have the 4-inch valve of its bigger Champion 4 sibling, but it does not need it to reach the ceiling. For a buyer who wants the maximum rating from a brand stocked at every big-box store, the Cadet 3 is the convenient answer.

Expert Take

This is the maximum-rated toilet to buy when you want it in your cart today, not shipped next week. The Cadet 3 hits 1,000 grams at 1.28 gallons, scrubs the bowl with PowerWash, and carries a 10-year warranty, all from a brand whose parts are on every shelf. A safe, sensible pick.

Check price on Amazon

Bottom Line: A widely stocked maximum-rated toilet that delivers 1,000-gram power, a self-scrubbing rim and a long warranty.

Best one-piece

Woodbridge T-0019

4.5 Best for: seamless body

The T-0019 proves that a one-piece toilet can reach the maximum 1,000-gram MaP rating just as easily as a two-piece, since the flush mechanism, not the body style, sets the score. It pairs that ceiling rating with a smooth, skirted, seam-free body that is easy to clean.

Flush TypeSiphon flush

GPF1.28

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty5-year limited

Best For

Maximum 1,000-gram MaP score in a one-piece body
Skirted, seam-free design with nothing awkward to clean
Soft-close seat usually included at 1.28 gallons

Not Ideal For

Buyers who want the widest big-brand parts network
Anyone on a tight budget, as one-piece bodies cost more

The T-0019 uses a tuned siphon flush that reaches the maximum rating while its skirted one-piece body hides the trapway behind a smooth side, so there is no contoured base to scrub around. Woodbridge has built a strong following by offering this design at a price below the legacy premium brands.

Owner reviews praise the clean look, the soft-close seat that usually comes included, and a flush that clears reliably. The main caveat is parts availability, which is why recording the model number is worthwhile. For a buyer who wants the maximum rating in a modern seamless body, the T-0019 is the standout one-piece. It also appears in our one-piece coverage within the best flushing toilets pillar.

Expert Take

Pick the T-0019 when you want the maximum flush rating wrapped in a sleek, easy-to-clean one-piece body. You get 1,000-gram clearing power, a skirted design with no seam, and a soft-close seat, usually for less than a comparable premium-brand one-piece. Record the model number for future parts.

Check price on Amazon

Bottom Line: The best one-piece at the maximum rating, combining 1,000-gram power with a clean, seamless, skirted body.

Best mainstream gravity

Kohler Highline

4.6 Best for: proven reliability

The Highline is one of Kohler's longest-running and most trusted toilets, reaching the maximum 1,000-gram MaP rating with the AquaPiston canister flush. The 1.6-gallon version is the one that hits the ceiling, making it a strong choice where parts familiarity and proven reliability matter most.

Flush TypeAquaPiston canister

GPF1.6

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty1-year limited

Best For

Maximum 1,000-gram MaP score with a proven canister flush
Comfort height and a 360-degree bowl rinse
Kohler parts stocked in nearly every hardware store

Not Ideal For

Water-conscious buyers, since the maximum-rated version uses 1.6 gallons
Anyone who wants a 1.28-gallon WaterSense version at the ceiling

The Highline uses the same AquaPiston canister as the Cimarron, lifting straight up to feed water 360 degrees around the rim for an even, thorough flush that reaches the maximum rating. Its decades on the market mean almost any plumber knows it inside out.

Owner reviews are among the steadiest of any toilet, citing long service life and a flush that does not fade. The trade-off is that the 1,000-gram version uses 1.6 gallons rather than 1.28, so if water savings are a priority, the Cimarron is the closer Kohler match. For a buyer who values a proven, widely serviced toilet at the maximum rating, the Highline is the dependable pick.

Expert Take

The Highline is the safe, boring-in-the-best-way choice at the maximum rating. It has been on the market for decades, every plumber knows it, and the AquaPiston canister rarely fails. If you can accept 1.6 gallons for that track record, it is hard to go wrong; if you want WaterSense, step to the Cimarron.

Check price on Amazon

Bottom Line: A proven, widely serviced maximum-rated toilet with a reliable canister flush, at the cost of 1.6-gallon water use.

Best modern look

Swiss Madison St. Tropez

4.3 Best for: contemporary style

The St. Tropez shows that the maximum 1,000-gram MaP rating is available in a sharp, contemporary design, not just utilitarian shapes. It pairs the ceiling score at 1.28 gallons with a sleek skirted body and a dual-flush option that suits a modern bathroom.

Flush TypeSiphon dual-flush

GPF1.28 (full)

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty1-year limited

Best For

Maximum 1,000-gram full-flush MaP score at 1.28 gallons
Sleek skirted body with a contemporary profile
Dual-flush option for water savings on liquid waste

Not Ideal For

Buyers who want the widest legacy-brand parts network
Anyone who prefers single-flush simplicity

The St. Tropez uses a siphon flush on its full-flush mode to reach the maximum rating, while the dual-flush button lets you use less water for liquid waste. Its skirted, seam-free body wipes clean in seconds and gives a small bathroom a high-end look.

Owner reviews focus on the modern styling and the clean lines, with the most common caution being to confirm parts and seals are noted for future service, as with any newer-generation brand. For a buyer who wants the maximum rating to come in a contemporary package, the St. Tropez delivers it. See how it compares within the broader best flushing toilets lineup.

Expert Take

Choose the St. Tropez when design matters and you still refuse to compromise on flush power. The full-flush mode hits the maximum 1,000-gram rating at 1.28 gallons, the dual-flush button trims water on liquids, and the skirted body looks the part. Just record the model and seal details for future maintenance.

Check price on Amazon

Bottom Line: The best-looking maximum-rated toilet, combining a 1,000-gram full flush with a sleek skirted, dual-flush design.

Best budget two-piece

Gerber Viper

4.4 Best for: rentals and value

The Viper is Gerber's value workhorse, and in its 1.28-gallon configuration it reaches the maximum 1,000-gram MaP rating for a price that undercuts almost every premium-brand equivalent. It is the toilet plumbers install by the dozen in rentals and family bathrooms.

Flush TypeGravity siphon jet

GPF1.28

MaP Score1,000 g

Bowl Height16.5 in (comfort)

Warranty5-year limited

Best For

Maximum 1,000-gram MaP score at the lowest price here
Comfort height and EPA WaterSense at 1.28 gallons
Plumber-favored reliability for high-use bathrooms

Not Ideal For

Buyers who want a premium-brand badge or finish
Anyone needing the widest big-box parts network

The Viper uses a straightforward gravity siphon-jet flush tuned to clear the maximum rated load at 1.28 gallons, prioritizing reliability over frills. Its comfort-height bowl and efficient flush make it a sensible default for landlords and budget-minded homeowners alike.

Owner reviews consistently praise the strong flush and the low price, with the main note being that Gerber parts, though dependable, benefit from having the model number on hand. For a buyer who wants the maximum rating at the lowest cost, the Viper is the budget standout that does not sacrifice flushing power. See it alongside other budget picks in our heavy-waste guide.

Expert Take

The Viper is the maximum-rated toilet for tight budgets and high-traffic bathrooms. You get a 1,000-gram WaterSense flush at comfort height for the lowest price on this list, with the plumber-grade dependability Gerber is known for. Keep the model number handy and it will serve a busy home for years.

Check price on Amazon

Bottom Line: The cheapest path to the maximum rating, delivering 1,000-gram power and WaterSense efficiency in a dependable two-piece.

Expert Take

Across all nine, the clearest pattern is that the maximum 1,000-gram MaP rating is no longer rare or expensive. Seven of these toilets reach it at just 1.28 gallons, and the value brands Gerber and Woodbridge hit the same ceiling as TOTO, Kohler and American Standard. Once you have confirmed a model's 1,000-gram score, your decision should turn entirely on water use, parts availability, bowl height and body style, because the flushing power is already maxed out.

Buying advice

How to choose a 1000-gram MaP toilet

Because every toilet here already holds the maximum flush rating, choosing well means looking past the headline number to the specs that decide daily performance. Focus on these four points and you will pick the right maximum-rated toilet for your bathroom.

Confirm the exact model's 1,000-gram score

A brand or a flush-technology name does not guarantee the maximum rating, because the same family can include both 1,000-gram and lower-scoring versions, often differing only by gallons per flush or bowl shape. Always look up the specific model and configuration on the MaP database rather than assuming. The TOTO Drake, for example, reaches 1,000 grams in its 1.28-gallon form, and some siblings in the same family score differently. Verifying the exact model protects you from buying a weaker variant by accident.

Spec tip. When two listings share a model name, check the gallons-per-flush and the configuration code, because a 1.28-gallon version and a 1.6-gallon version of the same toilet can carry different MaP scores. The configuration code, not just the marketing name, is what ties to the published 1,000-gram rating.

Prioritize water efficiency once the score is maxed

With the flush rating already at the ceiling, the next most important number is gallons per flush. An EPA WaterSense toilet uses 1.28 gallons or less and must still pass a minimum flushing-performance standard to earn the label, so a WaterSense 1,000-gram model gives you maximum power and minimum water at once. Over years of use, the difference between 1.28 and 1.6 gallons adds up to a meaningful water saving with zero loss of clearing ability. Unless you have a chronic-clog bathroom that wants the extra volume of a 1.6-gallon Champion 4, choose the 1.28-gallon WaterSense option.

Match flush valve and trapway to your needs

All these toilets clear the maximum load, but the path matters for how they feel day to day. A 3-inch flush valve is the modern standard and powers most of these picks, while the Champion 4's 4-inch valve dumps water fastest for the most violent gravity flush. Trapway width affects clog resistance; a fully glazed trapway of 2-1/8 inches or wider lets large loads pass smoothly. If you fight clogs, lean toward the widest valve and trapway; if you want efficiency and quiet, a 3-inch valve at 1.28 gallons is ideal.

Weigh parts availability and body style

A maximum-rated toilet is a long-term purchase, so think about service. The TOTO Drake, Kohler Highline and American Standard Cadet 3 keep flappers, fill valves and seats on every hardware-store shelf, while value brands like Gerber and Woodbridge are reliable but benefit from recording the model number. Body style is the final call: a two-piece is cheaper and easier to install, while a one-piece like the Woodbridge T-0019 is seamless and easy to clean but heavier and pricier. None of these choices affect the maximum rating, so pick what fits your bathroom and budget.

Is a 1000 Gram MaP Toilet Worth It for a Home?

Yes, a 1,000-gram MaP toilet is worth it because the maximum rating makes it effectively clog-proof in everyday use, sharply reducing second flushes and plunger sessions. Since many 1,000-gram models cost the same as weaker toilets and use just 1.28 gallons, there is little reason to settle for a lower score. The headroom pays off as years of reliable, worry-free flushing.

Expert Take

If you remember one thing, remember that a 1,000-gram MaP score is a ceiling, not a luxury upgrade. A toilet at the maximum rating has already proven it clears more than your home will ever produce, so the smart move is to buy at the ceiling when it costs no more, then decide between models on water use, parts and style. Chasing flush power beyond 1,000 grams is chasing a number that does not exist.

Our Verdict

For the best 1,000-gram MaP toilet overall, buy the TOTO Drake, which hits the maximum rating at just 1.28 gallons with universal parts. If you want the most raw gravity force for a chronic-clog bathroom, the American Standard Champion 4 matches the ceiling with a 4-inch valve, and the Gerber Avalanche delivers the maximum rating for the lowest cost.

FAQ

Common questions about 1000-gram MaP toilets

? What is a 1,000-gram MaP score?

A 1,000-gram MaP score is the maximum rating the independent Maximum Performance flush test awards, meaning the toilet cleared 1,000 grams of solid waste media in a single flush. The test does not rate above 1,000 grams because no realistic household load exceeds it, so the score signals a toilet that is effectively clog-proof in everyday use.

? Which 1,000-gram MaP toilet is the best overall?

The TOTO Drake is the best 1,000-gram MaP toilet overall because it reaches the maximum rating at just 1.28 gallons, holds EPA WaterSense certification, and uses universal parts stocked everywhere. Its G-Max siphon-jet flush has a decades-long reliability record, making it the smartest maximum-rated buy for most homes.

? Do 1,000-gram MaP toilets use more water?

Usually not. Most 1,000-gram toilets sold today, including the TOTO Drake, Cadet 3, Cimarron and Gerber Avalanche, use only 1.28 gallons per flush and carry EPA WaterSense certification. Modern bowl and valve engineering lets the maximum flush rating and the lowest water use coexist in the same toilet.

? Is a 1,000-gram MaP score overkill for a home?

In a literal sense yes, because no household produces a single 1,000-gram load. But that headroom is the point: a toilet at the ceiling clears any realistic load effortlessly, which is exactly what makes it clog-proof in daily use. Since many 1,000-gram models cost no more than weaker ones, the extra margin is worth having.

? What is the difference between a 600 and a 1,000-gram MaP toilet?

A 600-gram toilet has a strong flush that handles most loads well, while a 1,000-gram toilet has reached the maximum rating with extra clearing margin. In daily use the 1,000-gram model needs a second flush even less often and resists clogs more reliably, especially in high-use or large households.

? Does EPA WaterSense certification reduce a 1,000-gram flush?

No. WaterSense toilets must pass a minimum flushing-performance standard to earn the label, so a certified 1.28-gallon model has to clear waste effectively. Many WaterSense toilets reach the maximum 1,000-gram MaP score, proving the certification saves water without weakening the flush.

? Which brands make 1,000-gram MaP toilets?

TOTO, American Standard, Kohler, Gerber, Woodbridge and Swiss Madison all make toilets that reach the maximum 1,000-gram MaP score. TOTO leads on power-to-water efficiency, American Standard on raw gravity force, and Gerber and Woodbridge on value. No single brand dominates, so confirm the specific model's score.

? Is the American Standard Champion 4 a 1,000-gram toilet?

Yes. The Champion 4 reaches the maximum 1,000-gram MaP rating using the largest residential flush valve at 4 inches and a wide 2-3/8 inch trapway. It hits the ceiling through raw gravity force, though it uses 1.6 gallons per flush rather than the 1.28 gallons of the WaterSense picks.

? Can a one-piece toilet reach a 1,000-gram MaP score?

Yes. The flush mechanism, not the body style, sets the score, so a one-piece toilet like the Woodbridge T-0019 reaches the maximum 1,000-gram rating just as easily as a two-piece. One-piece toilets add a seamless, easy-to-clean body but are heavier to install and usually cost more.

? How do I verify a toilet's MaP score?

Look up the exact model and configuration on the independent MaP database at map-testing.com, which publishes scores for thousands of toilets. Check the gallons-per-flush and configuration code, since a 1.28-gallon and a 1.6-gallon version of the same model can carry different scores. Do not rely on the marketing name alone.

? Is a higher MaP score possible above 1,000 grams?

No. The MaP test caps its published rating at 1,000 grams because no realistic single household load exceeds it, so there is no rating beyond the maximum. Once two toilets both score 1,000 grams, the meaningful tie-breakers are water use, trapway width, parts availability and bowl height.

? Which 1,000-gram MaP toilet is the cheapest?

The Gerber Viper is typically the cheapest 1,000-gram MaP toilet, reaching the maximum rating at 1.28 gallons for a plumber-grade price that undercuts the premium brands. The Gerber Avalanche is a close second, adding the same ceiling score with comfort height for a budget-friendly figure.

? Do dual-flush toilets reach a 1,000-gram MaP score?

Yes, on their full-flush mode. A quality dual-flush toilet like the Swiss Madison St. Tropez can hit the maximum 1,000-gram rating on its full flush, while the reduced flush is for liquid waste only. When buying a dual-flush model, confirm the full-flush MaP score rather than an average.

? Are 1,000-gram MaP toilets quieter than pressure-assisted ones?

Generally yes. Most 1,000-gram toilets on this list use gravity or canister flushing, which is much quieter than a pressure-assisted unit that uses compressed air. They reach the same maximum rating without the loud whoosh, making gravity the better choice for bedrooms and shared walls.

? Will a 1,000-gram toilet splash more because it flushes harder?

Not necessarily. Splashing depends on bowl shape and water surface area, not flush rating. The maximum-rated toilets here are engineered to clear waste decisively without throwing water, and elongated bowls with a properly sized water spot actually splash less, so a high MaP score does not mean a messier flush.

? Which 1,000-gram toilet has the easiest parts to find?

The TOTO Drake, Kohler Highline and American Standard Cadet 3 have the best parts availability, with flappers, fill valves, canister seals and seats stocked in nearly every hardware store. Value brands like Gerber and Woodbridge are reliable but benefit from recording the model number for future service.

? Should I choose a 1.28 or 1.6-gallon 1,000-gram toilet?

Choose the 1.28-gallon WaterSense version unless you have a chronic-clog bathroom. Both reach the maximum rating, but the 1.28-gallon model saves water year after year with no loss of clearing power. The 1.6-gallon Champion 4 makes sense only when you specifically want the extra flush volume.

? How long will a 1,000-gram MaP toilet last?

A quality porcelain toilet from a major brand lasts decades, often the life of the bathroom, with only inexpensive internal parts like the flapper or fill valve needing occasional replacement. The maximum flush rating does not wear out, so a proven 1,000-gram model pays off for many years of reliable use.

? Can I upgrade my existing toilet to a 1,000-gram flush?

Not really. Cleaning rim jets, setting the correct water line and replacing a worn flapper can restore lost performance, but a fundamentally low-MaP toilet cannot be made to reach the maximum rating. If you want a 1,000-gram flush, replacing the toilet with a maximum-rated model is the only reliable path.

Sources

EPA WaterSense, epa.gov/watersense
MaP (Maximum Performance) flush testing, map-testing.com
Manufacturer published specifications (TOTO, Kohler, American Standard)

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How we rank & our data sources

We do not run physical lab tests. Rankings are built from published, verifiable data and real owner feedback, never paid placement.

MaP (Maximum Performance) flush scores
EPA WaterSense certification & GPF ratings
Manufacturer specifications (trapway size, flush-valve, rough-in)
Verified owner reviews from Amazon, Home Depot & Lowe’s

Researched by Marcus Bell · Last updated June 30, 2026 · Our review method

Researched by Marcus Bell

Marcus compiles bathroom-fixture data, MaP flush scores, GPF ratings, trapway and flush-valve specs, and weighs them against thousands of verified owner reviews to build our rankings. He does not run physical lab tests; every verdict is sourced from published specifications, certifications (MaP, EPA WaterSense) and real owner feedback.

Updated June 2026 · Toilets

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