Best Low Flow Toilets (1.28 GPF and Under)

The UltraMax II is the low flow toilet most buyers should start with, because it uses the WaterSense ceiling of 1.28 gallons yet flushes as strongly as a dedicated power toilet, so it saves water without ever forcing a second push.

The UltraMax II uses TOTO's Double Cyclone flush, which feeds water through two side jets to create a swirling rinse that scrubs the bowl rather than just dumping water down the front. That centrifugal motion lets a flat 1.28 gallon flush reach a 1,000 gram MaP score, the practical maximum any toilet hits, so a single flush clears solids cleanly every time. The savings are real precisely because the toilet does the job on the first push, never the second.

It is a one-piece, so there is no tank-to-bowl seam to clean, and the CeFiONtect glaze helps waste and minerals slide away between cleanings. Owner reviews run deep and consistently praise the strong, quiet flush and the low clog rate. The trade-offs are a price above value WaterSense models and the extra weight of a one-piece during install. For a household that wants the lowest practical water use with zero flush compromise, this is the default low flow choice, and it carries over from our roundup of the best water saving toilets of 2026.

If your goal is the lowest possible yearly water average rather than the lowest single-flush number, the dual flush Aquia IV beats any flat 1.28 gallon model by adding a 0.8 gallon light flush for the many liquid-only uses each day.

The Aquia IV pairs a very low 0.8 gallon partial flush for liquids with a 1.28 gallon full flush for solids, and because most uses in a normal day are liquid only, that 0.8 gallon light flush pulls the household average well below a flat 1.28 gallon toilet. The full flush still reaches an 800 gram MaP score using TOTO's Dynamax Tornado swirl, enough to clear solids cleanly without pressing the button twice. It is the low flow path that wins on a yearly meter reading.

The skirted two-piece body has smooth sides with no contoured trapway bumps to scrub, and the CeFiONtect glaze keeps the bowl cleaner between wipes. Owners praise the strong rinse and quiet refill, with the usual note that the top push-button takes guests a moment to learn. The other downside is a price above value single-flush picks. For a buyer focused on the lowest average use, the Aquia IV is the smart pick, and it also leads our guide to the best eco friendly toilets for a greener bathroom.

The Cimarron is Kohler's mainstream WaterSense toilet, and it lands the best balance of price, water savings, flush strength and nationwide parts support of any low flow pick on this list.

The Cimarron uses 1.28 gallons per flush and reaches a 1,000 gram MaP score thanks to Kohler's AquaPiston canister flush, which releases water into the bowl from all sides rather than a single point. That all-around flow gives a strong, even rinse on a low water volume, so a single flush clears the bowl reliably. It is a comfort-height elongated two-piece that suits most adults.

Because Kohler is sold in every big-box store, replacement seals and fill valves are easy to find locally for years, which is a real advantage over boutique brands, and the canister flush seals more reliably over time than a cheap flapper. The fully glazed trapway resists clogs and helps waste slide through. It is not skirted, so the two-piece seam and base contours need occasional wiping, and the styling is plainer than a designer one-piece. For a dependable low flow toilet with the easiest parts availability here, the Cimarron is the smart value buy.

The Cadet 3 proves you do not have to spend a lot to get a powerful low flow toilet, pairing a 1.28 gallon flush with a wide 3 inch flush valve that drives a forceful single clear at a budget price.

The Cadet 3 uses 1.28 gallons per flush and reaches a 1,000 gram MaP score through a large 3 inch flush valve, which is wider than the standard 2 to 2.5 inch valve and dumps water into the bowl faster and harder. That extra speed gives a forceful single flush that clears heavy loads as strongly as toilets costing far more, all at the WaterSense water limit. For a budget bathroom that still needs genuine clearing power, that combination is hard to beat.

The fully glazed EverClean trapway resists the buildup of stains and odor-causing bacteria, so the bowl stays fresher between cleanings, and the ten-year limited warranty is among the longest in the category. It is a comfort-height elongated two-piece with practical, utilitarian styling. The seam and contoured base need occasional wiping, and the fast flush is a touch louder than a quiet siphonic model. For the strongest WaterSense flush per dollar, though, the Cadet 3 is the clear budget answer, and a frequent pick in our roundup of the best EPA WaterSense certified toilets.

The Drake is one of the most widely owned toilets in North America, and the 1.28 gallon WaterSense version brings that proven, repairable flush into the low flow range with one of the deepest reliability records anywhere.

The 1.28 gallon Drake reaches a 1,000 gram MaP score using TOTO's G-Max or Tornado flush, depending on the exact variant, so a single flush clears solids strongly at the WaterSense water limit. Its owner-review history runs into the thousands and consistently reports a reliable, powerful flush with very few clogs, which is why it is a fixture in homes and light commercial settings alike.

Because the Drake has been in production so long, its internal parts are standard and easy to source, making it one of the most repairable toilets you can own. That longevity is itself a form of saving, since a toilet that lasts decades conserves the water and material a replacement would cost. It is a two-piece, so there is a seam to wipe, and the bowl and tank are sold separately on some listings, so confirm you are ordering the complete 1.28 gallon set. For a proven low flow workhorse, the Drake is a benchmark, and it features in our guide to the best flushing toilets.

The St. Tropez is the pick for the lowest possible water draw with modern styling, a sleek skirted one-piece whose dual flush light mode sips just 0.8 gallons at a price well below the premium brands.

The St. Tropez pairs a 0.8 gallon partial flush, among the lowest available anywhere, with a 1.28 gallon full flush that reaches an 800 gram MaP score, so it clears solids cleanly without pressing the button twice. Its appeal is the combination of that very low water use with a contemporary low-profile design and a fully skirted base that wipes clean in seconds. The soft-close seat and the button plate are included, which keeps the package complete out of the box.

Swiss Madison is a newer brand than the established names, so its long-term reliability record and parts depth are not as deep, and a few owners note the compact tank can refill a little slowly between flushes. Owner reviews are broadly positive on looks and flush strength, with the usual caution to confirm the bolt-down and supply connection on install. For a water-minded buyer who also wants a modern look for less, it is a strong low flow value.

The Highline is Kohler's straightforward, no-frills low flow two-piece, delivering efficient, dependable 1.28 gallon flushing without any complexity and with the brand's easy nationwide parts support.

The 1.28 gallon Highline reaches a 1,000 gram MaP score using the brand's AquaPiston canister, which feeds water into the bowl from all sides for a strong, even single flush at the WaterSense water limit. It is a popular choice for whole-house remodels precisely because it is simple, proven and easy to live with across several bathrooms, with comfort-height elongated geometry that suits most adults.

Like the Cimarron, it benefits from Kohler's nationwide parts availability, so seals and flush valves are easy to find locally, and the durable canister flush is less prone to leaking over time than a cheap flapper design. It is a plain two-piece with a seam to wipe and standard styling, and it is sold in multiple flush versions, so confirm you are ordering the 1.28 gallon model. For a buyer who wants a reliable low flow toilet at a fair price across several bathrooms, the Highline is a sensible, repeatable pick.

The T-0001 is the skirted one-piece that built Woodbridge's reputation, offering a designer body that looks far more expensive than it costs, available in a 1.28 gallon WaterSense variant for low flow buyers.

The T-0001 is a fully skirted one-piece, so the trapway hides behind a smooth side panel and the seamless body wipes clean in one pass. Woodbridge sells it in a 1.28 gallon WaterSense variant for buyers who want the lower flush, and the full flush posts an 800 gram MaP score, enough to clear solids in one push. The soft-close seat is included, a genuine bonus at this price, and the comfort-height elongated bowl suits most adults.

Owner reviews run deep and consistently praise a clean flush, a quiet refill and the upscale skirted shape that hides the trapway entirely. The tradeoff is that Woodbridge parts are less universal than TOTO or Kohler, so a repair may mean ordering a specific mechanism rather than grabbing a generic one, and the brand sells under several similar model numbers, so confirm the exact number and the 1.28 gallon volume before ordering. For designer styling with real water savings, it is a standout low flow choice and a regular pick among the best eco friendly toilets for a greener bathroom.

The Viper is Gerber's value low flow toilet, a plumber favorite that delivers genuine 1.28 gallon savings and dependable clearing for one of the lowest prices in the category.

Despite its low price, the Viper posts an 800 gram MaP score on its 1.28 gallon flush with a wide glazed trapway, so it resists clogs about as well as toilets that cost far more while staying at the WaterSense water limit. For a hardworking or rental bathroom where low flow savings are the goal and budget is tight, that combination of strength and value is hard to beat.

Gerber is a long-time plumber favorite because its toilets are dependable and inexpensive to service, and the simple two-piece design installs with standard fittings. The 800 gram MaP is strong but a step below the 1,000 gram leaders, and the styling is plain with an exposed trapway. For raw low flow value per dollar, though, the Viper is the smart-money contractor choice, much like its siblings in our guide to the best water saving toilets of 2026.