Sentinel™ 1.28 GPF – Elongated Toilet

With a 1.28 gallon flush that falls well under federal conversation requirements, the Sentinel toilet featuring EcoLogic™ Technology won’t be a drain on your water bill. The first flapperless toilet on the market, it 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 Sentinel a hassle-free option for any retrofit project. An elongated bowl provides maximum comfort. The Sentinel 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 EcoLogic Technology
  • Elongated bowl for maximum comfort
  • ADA Compliant


  • Uses 60% less water than a common 3.5 GPF toilet
  • Excellent MaP scores for better flushing
  • Maintenance free, leak free, no double flushing
  • Sweat-free tank


  • Eligible for Consumer Rebates
  • 1000g MaP Score
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Bowl Dimensions: 14.5”W x 16.5”H x 28.75”D
Footprint: 20.75”L x 10.25”W
Water Spot: 8″ x 6″
Assembled Dimensions: 17.5” W x 29.75” H x 31” D
Rough-In: 10″ – 12″

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Niagara® Ecologic® Tip Bucket Technology

Niagara® Toilets with EcoLogic® Technology feature an innovative tip-bucket technology that ensures a quiet, high-performance flush the first time, every time. The maintenance- and leak-free design eliminates the need to replace flappers, chains, and levers. No double flushing needed as one flush will thoroughly empty the bowl every time. Plus, no tank condensation!

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?