Niagara offers 14 watersense certified toilets models in the lineup we track. This page is the Niagara-specific cut of the broader EPA WaterSense Certified Toilets toilets category — same product class, narrowed to the Niagara catalog only.

About Niagara

Niagara — Niagara commercial water heaters.

For the complete Niagara lineup across all sub-types and capacities, see the Niagara Toilets hub.

Niagara EPA WaterSense Certified Toilets models we track

Niagara Stealth Sabre 0.8 GPF Two-Piece Elongated Vacuum-Assist Toilet (N7717) — Niagara Stealth Sabre — the lowest-flow gravity toilet IAPMO-certified in the US. 0.8 GPF vacuum-assist trapway, EPA WaterSense Most Efficient.
Niagara Stealth 0.8 GPF Two-Piece Round-Front Vacuum-Assist Toilet (N7715) — Niagara Stealth Original — the original 0.8 GPF vacuum-assist Niagara. Round-front bowl + UPC C11.301.01.
Niagara Liberty 1.28 GPF Two-Piece Elongated Toilet (N2840) — Niagara Liberty — Niagara's 1.28 GPF mainstream toilet. WaterSense, comfort height, value-tier alternative to Stealth Sabre.
Niagara Phantom 1.6 GPF Two-Piece Elongated Toilet (N2238) — Niagara Phantom — 1.6 GPF traditional gravity flush. Landlord-rebuild grade for installations where rebate eligibility isn't a factor.
Niagara Steaful 1.28 GPF Two-Piece Round-Front Toilet (N7716) — Niagara Steaful — entry-tier 1.28 GPF Niagara. Round-front, comfort height, value-tier WaterSense compliance.
Niagara Power One 0.8 GPF Two-Piece Elongated Vacuum-Assist Toilet (N7720) — Niagara Power One — refined ultra-low-flow toilet with upgraded vacuum-assist trapway. The newer flagship Niagara at 0.8 GPF.
Niagara Stealth Dual-Flush 0.8/1.1 GPF Two-Piece Elongated Toilet (N7718) — Niagara Stealth Dual-Flush — vacuum-assist toilet with 0.8 GPF light flush + 1.1 GPF heavy flush. Average use ~0.95 GPF.
Niagara One One-Piece Elongated 1.0 GPF Toilet (N7950) — Niagara One — sub-1.0 GPF one-piece toilet. Combines water savings + designer one-piece silhouette + WaterSense Most Efficient.

Other WaterSense Certified toilets brands

If you're cross-shopping watersense certified toilets beyond Niagara, the following brands also ship in this category:

About EPA WaterSense Certified Toilets toilets

EPA WaterSense is the federal voluntary water-efficiency certification program. A WaterSense-certified toilet uses 1.28 gallons per flush or less AND meets a minimum flush performance threshold (MaP score 350g+). Buying WaterSense-certified is the simplest way to ensure you're getting a real high-efficiency toilet, not just a label.

A 1.28 GPF toilet that won't reliably flush solid waste isn't actually water-saving — owners double-flush, defeating the savings. WaterSense certification requires the toilet to pass the MaP (Maximum Performance) test, which measures how much simulated solid waste the toilet clears in a single flush. The minimum threshold is 350g; most WaterSense-certified toilets test at 600–1,000g, well above the threshold.

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For the complete watersense certified buyer's guide (all brands, full comparison framework), see the EPA WaterSense Certified Toilets category hub.

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