TOTO Aquia IV Dual Flush Two-Piece Toilet vs American Standard H2Option Dual Flush Toilet: Which Should You Buy?

The TOTO Aquia IV has significantly better flush power. Its MaP score of 1000g means it can clear up to 1000 grams of solid waste in a single flush, while the American Standard H2Option only manages 600g. The MaP (Maximum Performance) score is an industry standard test that measures how much waste a toilet can flush effectively. A score of 1000g is considered excellent and suitable for heavy use, while 600g is below average and may lead to double flushing with larger loads. The TOTO also uses a 3-inch trapway compared to the H2Option's 2.375-inch trapway, which further reduces clog risk.

Both toilets are WaterSense certified, but the TOTO Aquia IV saves more water on the liquid flush. The TOTO uses 1.28 GPF for solid waste and 0.8 GPF for liquid waste, while the H2Option uses 1.28 GPF for solid and 0.92 GPF for liquid. The TOTO's liquid flush uses 0.12 gallons less per flush, which can add up to significant savings over time. For solid waste, both use the same 1.28 GPF. The TOTO's lower liquid flush rate makes it the more water-efficient choice overall, especially in households with frequent liquid flushes.

The TOTO Aquia IV is clearly better for heavy waste. Its MaP score of 1000g is nearly double the H2Option's 600g, meaning it can handle much larger waste loads without clogging. The 3-inch trapway is wider and fully glazed, allowing waste to pass through more easily. The TORNADO FLUSH system also helps by using dual nozzles to create a powerful rinsing action that clears the bowl thoroughly. For households with heavy waste, the TOTO Aquia IV is the superior choice, while the H2Option may require double flushing or cause blockages.