Best MaP 1000 Toilets: Maximum Performance Flush Rating

The TOTO Drake has carried the maximum 1,000-gram MaP score across multiple tested configurations and remains the single most recommended toilet by plumbers, contractors, and independent plumbing reviewers in North America.

The Drake uses TOTO's G-Max flushing system, which routes water through a large 3-inch flush valve and directs it into a 2-1/8-inch fully glazed trapway. The geometry creates a powerful siphonic action that pulls waste through the trap efficiently at 1.28 gallons rather than the 1.6 gallons older designs needed. Published MaP results show the Drake clearing the maximum 1,000-gram media load cleanly, which means every realistic household use falls well within its confirmed capacity.

Owner reviews aggregated across major retailers consistently place the Drake among the top-rated two-piece toilets for reliability. The most common feedback themes are that the flush is noticeably stronger than previous toilets in the same home, that it has not clogged after years of use, and that parts are easy to source when the fill valve or flapper eventually needs replacement. The Drake's longevity as a top seller means the supply chain for components is deep and stable.

The American Standard Champion 4 is built around the largest consumer flush valve in mainstream production: a 4-inch EverClean surface-coated valve that opens a nearly complete water column over the bowl in a single motion, producing a forceful bulk-clearing flush that earned the maximum 1,000-gram MaP rating.

The Champion 4's flush mechanism works differently from most siphonic designs. The 4-inch tower-style flush valve drops the entire tank volume into the bowl almost simultaneously, creating a high-volume surge rather than the gradually accelerating siphon that most 3-inch valve designs rely on. Published MaP testing confirms this approach reaches the 1,000-gram ceiling at 1.6 GPF. The trade-off is water volume: the Champion 4 uses 1.6 gallons per flush compared to the 1.28 gallons of most competitors on this list.

For households with older drainlines, septic systems with partial blockages, or high-occupancy use where the toilet cycles frequently, that extra water volume can be an advantage rather than a waste. Aggregated owner reviews note fewer maintenance calls compared to previous toilets, with several reviewers specifically mentioning that the Champion 4 replaced a toilet that was clogging weekly. See our dedicated best flushing two-piece toilets guide for more two-piece comparisons.

The TOTO UltraMax II brings the same 1,000-gram MaP-rated flush system found in the Drake into a single fused tank-and-bowl unit that eliminates the seam where grime and mold accumulate on two-piece designs.

The UltraMax II uses TOTO's Double Cyclone flushing system, which replaces the conventional rim holes found in most toilets with two nozzles that generate a powerful centrifugal water flow across the entire bowl. This design cleans the bowl surface more completely with each flush and directs water pressure toward the trapway exit rather than dissipating it across dozens of rim holes. The result is a 1,000-gram MaP score at 1.28 gallons per flush, which is the most water-efficient performance tier in this rating class.

Owners consistently cite the SanaGloss surface as a meaningful real-world benefit: the ionic barrier glaze reduces how often manual scrubbing is required to keep the bowl clean. Aggregated review data shows the UltraMax II receives high marks for aesthetics and cleaning ease alongside its flush performance, making it the preferred choice for master bathrooms and renovation projects where appearance and hygiene standards are high. For more one-piece options, see our best flushing one-piece toilets guide.

The American Standard Cadet 3 FloWise reaches the maximum 1,000-gram MaP rating while using only 1.28 gallons per flush and carrying EPA WaterSense certification, making it one of the best-value entries in the maximum-performance category.

The Cadet 3 FloWise uses American Standard's Power Wash rim technology, which directs water around the entire rim on flush rather than through conventional holes, improving bowl coverage and scrubbing action. Combined with the fully glazed 2-1/8-inch trapway, it moves waste through the drain quickly enough to clear the 1,000-gram MaP media at 1.28 gallons per flush. The EverClean surface, treated with an antimicrobial silver-ion formula, is standard across the Cadet 3 line and keeps the bowl cleaner between scrubbing sessions.

Aggregated owner reviews highlight the Cadet 3's reliability record. It is one of the most installed toilets in North America, which means its failure patterns are well understood and parts are genuinely cheap and easy to source. For rental property owners and renovation budgets where multiple toilets need replacement, the Cadet 3's combination of maximum MaP rating and accessible price makes it the practical first choice. Compare it against TOTO in our Kohler Highline vs Cadet 3 breakdown.

The Kohler Cimarron uses Kohler's AquaPiston flush canister, a 360-degree water-entry mechanism that replaces the conventional flapper with a canister that opens from all sides, pushing water into the bowl with greater force and coverage than traditional single-direction valve designs.

Kohler's AquaPiston canister mechanism is the key differentiator in the Cimarron. Standard toilet flush valves use a flapper that lifts and allows water to flow in one direction. The AquaPiston canister lifts straight up and exposes the valve from 360 degrees, releasing water equally in all directions into the bowl simultaneously. Kohler publishes independent MaP test results for the Cimarron showing it achieves the 1,000-gram maximum, which places it in the highest performance tier regardless of the mechanism's difference from conventional designs.

Aggregated owner reviews for the Cimarron consistently note satisfaction with flush power and bowl coverage. The Comfort Height specification at 17 inches above floor matches what most adults find comfortable for extended use and aligns with ADA accessibility guidelines. Kohler's warranty and service coverage make this a sound long-term choice for homeowners who prefer to stay within one brand's ecosystem across their bathroom fixtures.

The TOTO Drake II is the updated successor to the original Drake, replacing the G-Max flushing system with the Double Cyclone system, which uses two nozzles rather than rim holes to generate a high-momentum rotational rinse of the bowl on every flush.

The key difference between the Drake and Drake II is the flush geometry. Where the original G-Max system uses conventional rim holes to distribute water around the bowl, the Double Cyclone system routes water through two large propulsion nozzles that create a rotating rinse pattern. TOTO's published testing shows the Drake II meets the 1,000-gram MaP ceiling, and owner reviews suggest the bowl stays visibly cleaner between scrubbing sessions because the rotational water motion covers the entire surface rather than relying on gravity rundown from rim holes.

The Sanagloss ionic-barrier glaze on the Drake II is the same technology TOTO applies to the UltraMax II, and it works identically: the glaze reduces the surface energy of the porcelain so that waste, mineral deposits, and bacteria have less adhesion. Aggregated reviews confirm that owners notice a real difference in how often scrubbing is required. The Drake II is the better choice when bowl hygiene is a priority alongside maximum flush performance. For a detailed comparison of these two TOTO models, see our TOTO Drake vs Drake II breakdown.

The Woodbridge T-0001 is a dual-flush skirted one-piece toilet with a fully concealed trapway and a modern rectangular profile that suits contemporary bathroom renovations while carrying the maximum 1,000-gram MaP flush rating.

The Woodbridge T-0001's fully skirted design means the external surface from tank to floor is a smooth flat panel with no visible curves or ridges. There are no exposed trapway curves to collect dust and grime, which reduces the effort required to keep the exterior clean. Published MaP results confirm the T-0001 reaches 1,000 grams on its full 1.28 GPF flush mode, while the 0.8 GPF half-flush handles liquid waste using significantly less water. The dual-flush button sits on the top of the tank in a recessed position that maintains the rectangular profile.

Owner reviews frequently mention the aesthetics as the primary reason for purchase and the flush performance as a pleasant confirmation. The main reported concerns involve the skirted design making it harder to access the base for repairs, and Woodbridge's service infrastructure being less developed than the major brands. For buyers renovating a contemporary bathroom who need genuine top-tier flush performance in a modern form, the T-0001 is the clear choice.

The Gerber Viper is a no-frills commercial-grade two-piece toilet that earns the maximum 1,000-gram MaP score through a large glazed trapway and a robust 3-inch flush valve, without the premium pricing of TOTO or Kohler equivalents.

Gerber built its reputation supplying toilets to builders and light commercial projects where durability and maintenance simplicity outrank design. The Viper reflects that philosophy: a straightforward two-piece siphonic toilet with heavy vitreous china construction, a fully glazed trapway, and a 3-inch flush valve that produces enough velocity to reach the MaP ceiling at 1.28 gallons. The Viper carries WaterSense certification and qualifies for utility rebates in the same programs as premium-tier alternatives.

Aggregated owner and contractor reviews describe the Viper as exactly what it claims to be: reliable, functional, and unpretentious. The most common positive theme is that it keeps working without requiring maintenance calls. The most common negative theme is that it offers nothing distinctive in appearance. For any installation where function matters more than aesthetics and volume pricing creates real cost differences, the Gerber Viper delivers the maximum MaP credential at the lowest cost on this list. Read more in our best Gerber toilets guide.