Best 1.28 GPF Toilets: Maximum Efficiency Picks for 2026

The Drake II earns its position at the top of every credible 1.28 GPF list because it resolves the trade-off that most toilets can not: it delivers a maximum MaP score of 1000 grams on only 1.28 gallons. That combination is genuinely rare and explains why the Drake II dominates plumber recommendation threads, rental owner forums and efficiency-focused remodel guides.

TOTO's E-Max flush system uses a computer-optimized siphon jet that routes water through the bowl in a way that maximizes the hydraulic pull through the trapway. The 2.125-inch fully glazed trapway is wide enough to pass a 2-inch solid sphere, which is a standard MaP measurement benchmark. Owners across thousands of reviews describe a flush that is powerful without being dramatic: water exits cleanly, the bowl refills to an accurate level, and double-flushes are rare enough that many report never needing one.

Comfort height (roughly 17 to 19 inches rim to floor) makes standing and sitting easier for adults, particularly those managing knee or hip discomfort. The Drake II is available in 12-inch rough-in as the standard configuration, with 10-inch and 14-inch adapters sold separately. For households that want a best flushing toilet that genuinely saves water over a year, the Drake II's combination of a perfect MaP score and WaterSense certification is hard to argue against.

The UltraMax II is the pick for anyone who refuses to scrub a tank-to-bowl seam. Its seamless one-piece vitreous china body eliminates the gap where mold and mineral scale accumulate on two-piece models, and TOTO's proprietary CeFiONtect glaze creates a surface so smooth that particles have minimal friction to cling to.

TOTO's Double Cyclone system uses two nozzles instead of rim holes to generate a swirling wash across the entire bowl wall. This approach is quieter than a direct siphon jet and is particularly effective at keeping the bowl clean between uses. Owners who prioritize bathroom hygiene and quiet operation consistently rank the UltraMax II above the Drake II despite its lower MaP score.

The 800-gram MaP rating is still strong by any practical measure. An 800 g MaP toilet will clear average household waste reliably; only heavy-use scenarios (large families, commercial settings) consistently stress-test the gap between 800 and 1000 grams. For most standard households the UltraMax II represents a worthwhile trade: slightly lower raw clearing power in exchange for a significantly cleaner and quieter bathroom experience. Those seeking an efficient one-piece toilet will find this the easiest shortlist choice.

The Kohler Highline is the toilet that Home Depot and Lowe's stock in the largest volume and for good reason: it earns a 1000 g MaP score at 1.28 GPF, carries WaterSense certification, and has been on the market long enough that replacement parts are available at virtually every plumbing supply counter in the country.

Kohler's Class Five flushing system generates a wide, powerful water swirl that cleans the entire bowl surface, not just the central drain zone. The fully glazed 2-inch trapway passes MaP's standard solid-sphere test cleanly, and owners rate clog frequency very low in long-term reviews. Kohler publishes a one-year limited warranty on the toilet with a lifetime warranty on the china itself, which is competitive with TOTO and superior to most budget brands.

Where the Highline stands out relative to TOTO's offerings is parts accessibility. If a fill valve, flapper or flush valve needs replacement in five years, any hardware store will have a compatible Kohler part on the shelf the same day. For rental properties or homes with aging plumbing infrastructure where quick repairs matter, this is a non-trivial advantage. Compare its performance to the best two-piece flushing toilets and the Highline consistently sits near the top.

The Cadet 3 is American Standard's proof that a maximum MaP score does not require a premium budget. It scores 1000 grams on independent flush testing, uses 1.28 GPF, and adds the EverClean antimicrobial surface that resists stain-causing bacteria over time -- a useful feature for bathrooms that go longer between deep cleans.

American Standard's PowerWash rim scrubs the entire bowl surface during each flush cycle, directing water under and around the rim rather than just down the center. Combined with the 2-inch fully glazed trapway, this creates a flush that is more thorough than most toilets in its price category. MaP testing bears this out with a top-tier 1000 g rating.

The Cadet 3 is also a practical choice for older homes with non-standard plumbing because it is available in 10, 12 and 14-inch rough-in configurations without requiring an adapter kit. For rental units, guest bathrooms and secondary bathrooms where budget matters more than aesthetics, it is the most defensible affordable pick on this list. Those comparing it with the Champion lineup should also read the best American Standard toilets guide for a full brand comparison.

The Cimarron improves on the Highline in two areas most buyers care about: seat height and visual profile. It sits at a full 16.5-inch bowl height (taller on some configurations), uses the same Class Five flush system and 1000 g MaP rating, and adds a more tapered, contemporary silhouette that reads as a step above the standard Highline in a renovated bathroom.

Kohler's ADA-compliant Cimarron versions meet the 17 to 19-inch rim height required for accessibility compliance, which makes it a go-to pick for master bathrooms shared by adults with varying mobility needs. The Class Five system is identical to the one in the Highline, so performance differences between the two toilets are purely cosmetic and configurational rather than mechanical.

Owner reviews for the Cimarron consistently note its flush is indistinguishable from the Highline in power, which is exactly what you want when you are paying more for style. If the Highline is the workhorse, the Cimarron is its better-dressed sibling. Buyers renovating a master bath who want the reassurance of a brand with decades of warranty support alongside a more modern look will land here. See also the full best Kohler toilets guide for deeper comparisons across the Kohler lineup.

The Aquia IV is the dual-flush 1.28 GPF option from TOTO, adding a 0.8 GPF partial flush for liquid waste alongside the standard 1.28 GPF full flush. In a household where the light flush gets used 60 to 70 percent of the time, annual water use can drop meaningfully below even a single-flush 1.28 GPF toilet.

TOTO markets the Aquia IV toward the WASHLET and bidet-seat ecosystem, and the toilet is designed with a rear mounting inlet to accommodate WASHLET+ integrated seats without exposed supply lines. That compatibility adds long-term value if you plan to upgrade the seat later. The Dual Cyclone flush at 0.8 GPF produces a gentler but effective rinse for liquid-only flushes, and the 1.28 GPF full cycle clears solid waste at the standard 800 g MaP rating.

For households tracking water use carefully -- particularly in drought-prone states where water rates are tiered -- the Aquia IV's 0.8 GPF partial flush is a meaningful efficiency tool. EPA WaterSense certifies the Aquia IV across both flush volumes, which satisfies rebate requirements in states and municipalities that offer incentives for efficient fixture replacement. For a broader look at dual-flush options, see the best dual-flush toilets guide.

Gerber's Viper is less recognized by consumers than the TOTO and Kohler names, but it shows up consistently in multi-unit housing and light commercial installations because it is engineered to be serviced quickly and to last under heavy use. The Viper's 800 g MaP score is solid and its siphon-action flush is quieter than most gravity competitors in its tier.

Gerber's internal components are designed around the company's proprietary flush valve, which has published replacement part numbers and a documented service interval. For property managers overseeing 20 or more units, the ability to order standardized replacement parts and train maintenance staff on a single flushing mechanism has genuine operational value that consumers rarely consider.

The Viper's 800 g MaP is adequate for standard residential use; the gap between 800 and 1000 grams is not meaningful in a lightly-used half bath or guest bathroom. Owner reviews show low rates of early failure and note that the bowl glaze holds up well under hard-water conditions. Gerber offers a one-year limited warranty on parts and a ten-year warranty on the vitreous china itself.

The Woodbridge T-0001 brings a fully skirted, seamless one-piece look to the 1.28 GPF category at a significantly lower cost than Swiss Madison or the premium TOTO one-piece lineup. The concealed trapway and flush-to-floor profile eliminate the visual complexity of an exposed base, and the included slow-close seat is a welcome addition at this tier.

Woodbridge's siphon jet flush is notably quiet for a gravity toilet, which owners consistently mention in reviews. The concealed trapway is fully glazed and conforms to standard 2-inch minimum diameter, so the 800 g MaP score reflects bowl and jet geometry rather than a narrowed passage. In daily use, an 800 g toilet handles typical residential waste without issue; the rating gap becomes relevant primarily in high-frequency or heavy-load environments.

The T-0001 represents a practical middle ground for homeowners who want the visual language of a luxury toilet without paying for a TOTO UltraMax II or Kohler San Raphael. Owner reviews across platforms describe it as performing well above its position, particularly regarding flush quietness and the quality of the included seat hardware. For a broader look at skirted options, the best skirted flushing toilets guide covers this category in depth.