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Toilet Comparison
Niagara Stealth Ultra High Efficiency Toilet vs Glacier Bay 2-Piece Power Flush Toilet: Which Should You Buy?
Side-by-side spec comparison, flush power data and real owner feedback.
Winner for most people
Niagara Stealth Ultra High Efficiency Toilet
The Niagara Stealth wins for most buyers because it delivers an 800g MaP score using only 0.8 GPF, saving 27% more water than the Glacier Bay while matching flush power. Its 3-inch glazed trapway and 5-year warranty add long-term value.
Check Price on Amazon| Spec | Niagara Stealth | Glacier Bay Power Flush |
|---|---|---|
| MaP Score | 800g | 800g |
| GPF | 0.8 | 1.1 |
| Flush System | Vacuum-assist stealth | Power flush gravity |
| Trapway | 3-inch fully glazed | 2.25-inch |
| Height | Standard (15 in) | Standard (16 in) |
| Rough-In | 12-inch | 12-inch |
| Seat Included | Yes | Yes |
| WaterSense | Yes | Yes |
| Warranty | 5 years | 1 year limited |
| Overall Edge | → Niagara Stealth for water savings and warranty | |
Niagara Stealth Ultra High Efficiency Toilet
MaP Score800g
GPF0.8
Trapway3-inch fully glazed
Warranty5 years
Flush TypeVacuum-assist stealth
Pros
- Uses only 0.8 gallons per flush, the lowest in this comparison
- 3-inch fully glazed trapway reduces clog risk
- 5-year warranty offers strong protection
- Vacuum-assist flush is quiet and efficient
Cons
- Standard 15-inch height may feel short for taller users
- Vacuum-assist system can require more maintenance over time
The Niagara Stealth Ultra High Efficiency Toilet is engineered for maximum water conservation without sacrificing flush performance. Its vacuum-assist stealth technology uses air pressure to pull waste through a 3-inch fully glazed trapway, achieving an 800g MaP score with just 0.8 GPF. This makes it one of the most water-efficient toilets on the market while still handling heavy loads effectively. The included seat and WaterSense certification add convenience and environmental cred.
Owners frequently note that the Niagara Stealth flushes quietly and rarely requires double flushing, even with solid waste. The 5-year warranty is a significant advantage over many competitors, providing peace of mind for long-term use. However, the standard 15-inch height may not be ideal for everyone, and the vacuum-assist mechanism can occasionally need attention to maintain optimal performance.
Expert Take
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The Niagara Stealth is a top pick for eco-conscious buyers who want proven flush power. Its 0.8 GPF and 800g MaP score are a rare combination that saves water without compromise.
Glacier Bay 2-Piece Power Flush Toilet
MaP Score800g
GPF1.1
Trapway2.25-inch
Warranty1 year limited
Flush TypePower flush gravity
Pros
- Power flush gravity system delivers strong 800g performance
- 16-inch height offers a slightly more comfortable seat
- WaterSense certified for efficient water use
- Budget-friendly option for power flush buyers
Cons
- Uses 1.1 GPF, 27% more water than the Niagara Stealth
- Only 1-year limited warranty
- 2.25-inch trapway is smaller and may clog more often
The Glacier Bay 2-Piece Power Flush Toilet uses a power flush gravity system to move waste efficiently, earning an 800g MaP score. It operates at 1.1 GPF, which is higher than the Niagara Stealth but still below the federal standard of 1.6 GPF. The 16-inch height is slightly taller than the Niagara, which some users prefer for easier sitting and standing. The included seat and WaterSense certification make it a solid value option.
Users report that the Glacier Bay flushes reliably for most household needs, but the 2.25-inch trapway is narrower than the Niagara's 3-inch passage, which can lead to more clogs with large waste or heavy paper use. The 1-year limited warranty is shorter than many competitors, so long-term durability is less certain. It is best suited for budget-minded buyers who want a power flush without paying a premium.
Expert Take
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The Glacier Bay Power Flush is a capable budget toilet with strong flush power, but its higher water use and shorter warranty make it less appealing for long-term savings.
Which has better flush power?
Both toilets achieve an identical MaP score of 800 grams, meaning they can flush up to 800 grams of solid waste in a single flush. The MaP (Maximum Performance) test is the industry standard for measuring flush power, and 800g is considered excellent for residential toilets. The Niagara Stealth uses a vacuum-assist system that relies on air pressure to pull waste through a 3-inch trapway, while the Glacier Bay uses a power flush gravity design that pushes waste through a narrower 2.25-inch trapway. In terms of raw flush power, they are equal on paper, but the Niagara's larger trapway gives it an advantage in preventing clogs over time. For most users, flush power is a tie, but the Niagara has a slight edge in reliability.
Which saves more water?
The Niagara Stealth uses only 0.8 gallons per flush (GPF), while the Glacier Bay uses 1.1 GPF. This means the Niagara saves 27% more water per flush. Over a year with an average of 5 flushes per day per person, the Niagara could save approximately 547 gallons per person compared to the Glacier Bay. Both toilets are WaterSense certified, meaning they meet EPA standards for water efficiency, but the Niagara is clearly the superior choice for water conservation. If you are on a septic system or pay high water bills, the Niagara Stealth is the better option for long-term savings.
Which is better for heavy waste?
For heavy waste, both toilets have the same 800g MaP score, so they can handle the same maximum load. However, the Niagara Stealth has a 3-inch fully glazed trapway compared to the Glacier Bay's 2.25-inch trapway. A larger trapway reduces the chance of clogs when flushing large amounts of waste or toilet paper. The Niagara's vacuum-assist system also creates a strong suction that helps clear the bowl quickly. The Glacier Bay's power flush gravity system is effective but may struggle more with large loads due to the narrower passage. For heavy waste, the Niagara Stealth is the better choice because of its larger trapway and consistent performance.
Choose Niagara Stealth if...
- You want the lowest water consumption at 0.8 GPF
- You prioritize a larger 3-inch trapway to reduce clogs
- You value a longer 5-year warranty for peace of mind
- You need a quiet flush that won't disturb the household
Choose Glacier Bay Power Flush if...
- You are on a tight budget and want a power flush toilet
- You prefer a slightly taller 16-inch seat height
- You don't mind using 1.1 GPF for similar flush power
- You plan to replace the toilet within a few years
Frequently Asked Questions
What does the MaP score of 800g mean?
The MaP (Maximum Performance) score of 800 grams means each toilet can flush up to 800 grams of solid waste in a single flush. This is a high score that indicates strong performance for residential use.
Which toilet uses less water?
The Niagara Stealth uses 0.8 GPF, which is 27% less water than the Glacier Bay's 1.1 GPF. Both are WaterSense certified, but the Niagara is more efficient.
Are both toilets WaterSense certified?
Yes, both the Niagara Stealth and Glacier Bay Power Flush are WaterSense certified, meaning they meet EPA standards for water efficiency and performance.
Which toilet has a better warranty?
The Niagara Stealth has a 5-year warranty, while the Glacier Bay has only a 1-year limited warranty. The Niagara offers much better long-term protection.
Which toilet is easier to install?
Both are 2-piece toilets with a 12-inch rough-in, so installation is similar. The Glacier Bay may have slightly simpler instructions, but both are standard to install.
Do these toilets come with a seat?
Yes, both the Niagara Stealth and Glacier Bay Power Flush include a seat with the purchase.
Which toilet is better for a small bathroom?
Both are standard height and size. The Niagara Stealth's quieter flush may be better for small bathrooms where noise is more noticeable.
Can these toilets handle heavy waste?
Both have an 800g MaP score, so they can handle heavy waste. The Niagara's 3-inch trapway gives it an advantage in preventing clogs.
Sources
- MaP Flush Testing Program, map-testing.com
- EPA WaterSense, epa.gov/watersense
- Manufacturer published specifications
Verdict
The Niagara Stealth Ultra High Efficiency Toilet is the clear winner for most buyers, offering identical 800g flush power with 0.8 GPF water savings, a larger 3-inch trapway, and a 5-year warranty. The Glacier Bay Power Flush is a decent budget alternative if you prefer a 16-inch height and lower upfront cost, but it uses more water and has less long-term value.
How we rank & our data sources
We do not run physical lab tests. Rankings are built from published, verifiable data and real owner feedback, never paid placement.
- MaP (Maximum Performance) flush scores
- EPA WaterSense certification & GPF ratings
- Manufacturer specifications (trapway size, flush-valve, rough-in)
- Verified owner reviews from Amazon, Home Depot & Lowe’s
Researched by BFT Editorial Team · Last updated June 30, 2026 · Our review method
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