Sentinel™ 1.6 GPF – Round Toilet

Using a mere 1.6 gallons per flush, the EcoLogic™ toilet won’t be a drain on your water bill. The first flapperless toilet on the market, Niagara’s EcoLogic is virtually maintenance free, meaning no leaking and no hasty trips to the hardware store. It features innovative tip-bucket technology that ensures quiet, high performance flushes that clear the bowl the first time, every time.

An oversized footprint and flexible features like adjustable rough-in depth and opposable handle positioning, make the EcoLogic a hassle-free option for any retrofit project. A round bowl provides comfortable seating even in the smallest spaces. Niagara’s EcoLogic is a pitch-perfect blend of conservation, function, and performance.


  • Adjustable rough-in depth from 10” to 12”; no conversion kits required
  • Oversized footprint
  • Opposable handle positioning
  • Flapperless tank with Fluidmaster fill valve
  • Patented Flapperless Stealth Technology
  • Round bowl fits into any space


  • Uses 54% less water than a common 3.5 GPF toilet
  • Excellent MaP score for better flushing
  • Maintenance free, leak free, no double flushing
  • Sweat-free tank


  • 800g MaP Score


Bowl Dimensions: 14.5”W x 15.5”H x 26.75”D
Footprint: 20.75”L x 10.25”W
Water Spot: 8’’ x 6’’
Assembled Dimensions: 20.5” W x 29.5” H x 28.5” D
Rough-In: 10’’ – 12’’

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EcoLogic® Technology

Go Flapperless.™ The original way we helped destroyed the flapper and excel water conservation efforts. See EcoLogic technology in action.

Part 1 of 6 – EcoLogic Troubleshooting


Part 2 of 6 – EcoLogic Troubleshooting

Toilet Continually Running?

Part 3 of 6 – EcoLogic Troubleshooting

Poor Flush Performance?

Part 4 of 6 – EcoLogic Troubleshooting

Does Water Well Up?

Part 5 of 6 – EcoLogic Troubleshooting

Dump Bucket Getting Stuck?

Part 6 of 6 – EcoLogic Troubleshooting

Want To Switch The Side The Handle Is On?