Niagara Gravity-Flush Toilets

Niagara offers 14 gravity flush toilets models in the lineup we track. This page is the Niagara-specific cut of the broader Gravity-Flush 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 Gravity-Flush 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 Gravity Flush toilets brands

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

• Kohler Gravity Flush
• TOTO Gravity Flush
• American Standard Gravity Flush
• Eljer Gravity Flush
• Swiss Madison Gravity Flush
• Woodbridge Gravity Flush
• Delta Gravity Flush
• DeerValley Gravity Flush

About Gravity-Flush Toilets toilets

Gravity flush is the default residential toilet mechanism in the US. Water stored in the tank drops into the bowl via gravity (with the help of a flush valve at the bottom) when you press the handle, creating a siphonic flow that empties the bowl through the trapway. It's the engineering used in 95%+ of US residential toilets, including every major brand's volume models.

The flush sequence:

1. You press the handle → the trip lever lifts the flapper
2. Water rushes from the tank through the now-open flush valve into the bowl
3. The water raises the bowl water level above the trapway weir
4. Water cascades into the trapway, creating siphonic action that empties the bowl
5. Siphon breaks when air re-enters; refill cycle begi...

   For the complete gravity flush buyer's guide (all brands, full comparison framework), see the Gravity-Flush Toilets category hub.

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