Niagara Stealth vs American Standard Cadet 3: Eco vs Power

How Do the Niagara Stealth and American Standard Cadet 3 Differ in Flush Technology?

Understanding the mechanical difference helps predict real-world behavior. The Niagara Stealth's vacuum-assist tower mechanism is sealed and somewhat self-contained inside the tank. When you press the flush handle, the tower valve lifts, creates a hydraulic seal, and draws air from the trapway before water rushes down. This vacuum effect amplifies the momentum of a small water volume. Niagara Conservation, the manufacturer, has held patents on this system since the mid-2000s and continues to refine the seal tolerances with each product generation.

The American Standard Cadet 3 works on principles that have been proven in American bathrooms for decades. A flapper drops after flush, the tank water drops into the bowl through the siphon jet, and the large trapway opening pulls the entire bowl contents through in one clean motion. American Standard's PowerWash rim scrubbing technology simultaneously cleans the bowl surface during each flush, adding a maintenance benefit that the Niagara Stealth's vacuum design cannot easily replicate.

What Are the MaP Flush Test Scores for Each Toilet?

MaP testing (Maximum Performance) is the independent benchmark used by the Alliance for Water Efficiency and referenced by EPA WaterSense. Toilets are tested using simulated waste made of soybean paste loaded to specific gram targets. The toilet passes if it removes the load completely in a single flush with no residue remaining on bowl surfaces or in the trapway.

A 1,000-gram MaP score is the highest rating possible and indicates that the toilet can handle the equivalent of roughly 2.2 pounds of solid waste per flush -- far beyond what any normal flush event would require. This overhead means the Cadet 3 is essentially never at risk of an incomplete flush under normal residential conditions. The Niagara Stealth's 500-gram score means it handles normal average loads but leaves less margin when waste volume spikes.

The winner row highlights annual water consumption calculated at 10 flushes per day -- a commonly cited household average. Over a full year, the Niagara Stealth saves roughly 175 gallons per person compared to the Cadet 3. In a four-person household, that differential approaches 700 gallons annually -- meaningful but not transformative for most water bills. In drought-restricted municipalities or homes on metered wells, the savings matter considerably more.

Which Toilet Resists Clogging Better?

Clog resistance is one of the most practically important metrics for daily toilet satisfaction, and the two toilets diverge sharply here. The Cadet 3 is part of American Standard's lineup that also includes the Champion 4 -- a model famous for flushing an entire bucket of golf balls in manufacturer demos. The Cadet 3 does not match the Champion 4's 4-inch flush valve (it uses a 3-inch valve), but its 2-3/8-inch trapway is still generous by industry standards, and the fully glazed finish means waste slides through with minimal friction.

The Niagara Stealth's vacuum-assist mechanism compensates for its smaller water volume by creating suction, but that suction is finite. Dense or high-volume waste loads can exceed the pulling capacity of the vacuum system, resulting in an incomplete flush that requires a second flush -- which defeats much of the water-saving benefit. Several owner reviews on plumbing retail forums note that switching to a thinner toilet paper brand improved the Stealth's performance noticeably, suggesting that the system operates with less margin than the Cadet 3.

How Do These Toilets Compare on Water Efficiency and EPA WaterSense Certification?

EPA WaterSense is a voluntary partnership program run by the U.S. Environmental Protection Agency. To earn the WaterSense label, a toilet must use no more than 1.28 GPF, achieve a MaP flush score of at least 350 grams, and be independently tested by an EPA-approved third-party laboratory. Both toilets in this comparison pass that threshold, but the Stealth's 0.8 GPF puts it in a separate efficiency tier entirely.

For comparison, older 1.6 GPF toilets -- still common in homes built before 2015 -- use twice the water of the Niagara Stealth per flush. Replacing a 1.6 GPF toilet with a Stealth in a four-person household saves an estimated 7,000 gallons per year. Replacing it with a Cadet 3 saves roughly 4,380 gallons per year. Both represent significant conservation improvements over legacy models, but the Stealth's advantage is substantial on a percentage basis.

Some state and local water districts in California, Texas, Colorado, and other drought-prone regions offer tiered toilet rebates. Standard EPA WaterSense rebates typically range from $50 to $150 per toilet. In several California water districts (East Bay MUD, MWD of Southern California), toilets rated at 0.8 GPF or lower have historically qualified for higher rebate tiers -- sometimes up to $200 or $250. Checking the EPA WaterSense rebate finder before purchasing is worthwhile for either model.

Which Toilet Is Easier to Install and Maintain Long-Term?

Both toilets are two-piece designs with standard 12-inch rough-in, meaning installation follows the same general sequence: set the wax ring, lower the bowl, bolt it down, connect the tank, attach the supply line, and test. Neither toilet requires special tools or professional installation if the homeowner has basic plumbing familiarity.

Where they diverge is the ongoing maintenance profile. The Cadet 3 uses a 3-inch flapper as its primary sealing component. Flappers cost between $5 and $15 at any home improvement store and take roughly 10 minutes to replace. The fill valve is a standard design compatible with universal aftermarket replacements from brands like Fluidmaster. Every component is commodity hardware.

The Niagara Stealth's tower flush valve is a proprietary assembly. Replacement towers are available through Niagara Conservation's website and a smaller subset of plumbing suppliers. Owner reviews on home improvement forums note that sourcing replacement parts during supply chain disruptions has been frustrating. The tower mechanism also requires a somewhat different diagnostic approach than a standard flapper -- homeowners unfamiliar with vacuum-assist systems may need to contact manufacturer support or a plumber for troubleshooting that would be obvious on a gravity system.

On the positive side, the Niagara Stealth's sealed tower design means fewer moving parts exposed to mineral deposits, and the toilet tends to be notably quiet during flushing -- a benefit many owners highlight. The Cadet 3 produces a conventional gravity-flush sound that is standard for its class but noticeably louder than the whisper-quiet Stealth.

Who Should Buy the Niagara Stealth and Who Should Buy the Cadet 3?

Framing this as "eco vs power" captures the fundamental tradeoff accurately. These are not competing for the same buyer in every case. The Niagara Stealth was designed for a specific performance envelope -- maximum water efficiency in a household where the flush load stays moderate. Within that envelope, it is exceptional. The American Standard Cadet 3 was designed to be a reliable, clog-free workhorse for everyday American household use, and it executes that role with a MaP score that places it alongside TOTO Drake and Kohler Cimarron in raw flush performance.

A helpful mental model: if your previous toilet never clogged and water efficiency is your primary concern, the Stealth earns serious consideration. If your previous toilet clogged regularly, or if you have children in the house, the Cadet 3's flush reliability is worth the slightly higher water consumption per flush. For a broader look at how both models stack up against the full category, see our best flushing toilets guide.

It is also worth noting that American Standard offers the Cadet 3 in both standard-height and Right Height (comfort height, 17.5 inches) configurations, with elongated and round bowl options. The Niagara Stealth is available in elongated only at standard height. For households requiring ADA-compliant seating height or a round bowl option, the Cadet 3 simply has more available configurations.

Comparing Both Against the Broader Toilet Market

To give these two toilets context, it helps to compare them against other well-known models in their class. The TOTO Drake II operates at 1.28 GPF with a 1,000-gram MaP score and TOTO's Tornado Flush system -- it matches the Cadet 3 on flush performance while adding bowl-cleaning technology, though at a higher price point. The Kohler Cimarron also achieves 1,000 grams MaP at 1.28 GPF and is priced comparably to the Cadet 3. Among ultra-low-flow models, the TOTO Aquia IV offers dual-flush at 1.0/0.8 GPF, giving users a middle path that the Cadet 3 vs Stealth comparison does not include.

For families who want strong flush performance with better water efficiency than a single-flush 1.28 GPF, dual-flush toilets from Woodbridge (T-0001 at 1.0/1.6 GPF) or Swiss Madison represent viable alternatives to both models reviewed here. The Gerber Viper and Gerber Avalanche round out the competitive gravity-flush field at similar price points to the Cadet 3. See our Champion 4 vs Cadet 3 comparison and Kohler Cimarron vs Cadet 3 guide for related context.

The American Standard Cadet 3 is itself reviewed in detail in our full American Standard Cadet 3 review, which covers seat height options, available colors, and the full range of Cadet 3 configurations. Our Niagara Stealth review goes deeper on vacuum-assist technology, installation notes, and owner feedback patterns.