Niagara Stealth Ultra High Efficiency Toilet vs Glacier Bay 2-Piece Power Flush Toilet: Which Should You Buy?

The Niagara Stealth and the Glacier Bay Power Flush land on the same shortlist for one reason. Both skip the ordinary gravity flush and use a vacuum-assist system to move waste with very little water. That shared engineering is where the similarity ends. The Niagara Stealth is an ultra-high-efficiency toilet that flushes on just 0.8 gallons, the lowest volume you can buy in a standard fixture. The Glacier Bay Power Flush runs at 1.28 gallons, the mainstream high-efficiency rate, and arrives boxed with a seat and install hardware. We compared the manufacturer and retailer specifications side by side and folded in what owners consistently report, so you can pick the bowl that fits your bathroom and your priorities instead of guessing.

Before the head to head, it helps to know how a vacuum-assist toilet differs from the tank and flapper design in most homes. Our primer on how toilets work walks through gravity, pressure-assist and vacuum systems so the terms below make sense.

Niagara Stealth vs Glacier Bay Power Flush at a glance

The table lists only values confirmed against Niagara specification sheets and current Glacier Bay retailer listings. Both brands sell more than one configuration, so treat the height and shape rows as the common elongated setup rather than the only option.

How the two vacuum-assist flushes differ

Both toilets belong to the same rare family, and understanding the mechanism explains why each behaves the way it does. As the tank refills, water pushes air into a sealed transfer path that pressurizes the trapway. When you flush, that trapped air is pulled back into the inner chamber, and the sudden pressure drop creates a strong siphon that yanks water and waste down the drain. The payoff is efficiency and quiet. Niagara states the Stealth is quieter than pressure-assist toilets and quieter than many gravity models, because there is no separate pressure vessel banging out a loud whoosh.

Glacier Bay applies the same vacuum-assist principle in its Power Flush line. Home Depot describes a patented power flush that clears seven billiard balls on the first flush, a marketing demonstration of trapway evacuation rather than a lab metric. The practical result matters more than the claim. Both models are listed at a MaP score of 800 grams, meaning independent-style testing showed each clearing 800 grams of solid waste in one flush. If that number is new to you, our explainer on what a MaP score means covers why 1000 grams is the ceiling and why 800 already signals a strong, reliable flusher. On raw flushing muscle these two are effectively tied.

Niagara Stealth: the water miser

The Stealth exists to answer one question, how little water can a toilet use and still flush well. At 0.8 gallons per flush it uses roughly half the older 1.6 gallon federal standard and beats the 1.28 gallon WaterSense threshold with room to spare. The common elongated model sits at a 17 inch EZ Height rim for easier standing and sitting, uses a standard 12 inch rough-in, and runs a fully glazed 2 inch trapway that helps waste clear cleanly. It is WaterSense labeled and certified to ASME A112.19.2 and CSA B45.1, so it meets North American plumbing code.

Owners consistently single out two things, the quiet flush and the drop in water use, which shows up on utility bills in high-use households. The honest caveats are real. The bowl carries a smaller water spot than a 1.6 gallon toilet, so the glazed surface can need an occasional swipe with the brush, and an ultra-low-flow fixture rewards a well-sloped, unobstructed drain line more than a thirsty toilet does. Many listings sell the Stealth as tank and bowl only, so budget for a seat unless the listing states one is included.

• Pros: Lowest water use at 0.8 GPF, very quiet vacuum-assist flush, MaP 800, WaterSense, 17 in EZ Height, glazed 2 in trapway.
• Cons: Smaller water spot in the bowl, best paired with a good drain slope, seat often not included, older platform.

Check current price

Glacier Bay Power Flush: the value all-rounder

The Power Flush is Home Depot's house-brand take on vacuum-assist, and it leans on completeness and support rather than record-low water use. It flushes at 1.28 gallons, the mainstream high-efficiency rate, and the common elongated model pairs a chair-height bowl with a fully glazed 2 inch trapway and a 12 inch rough-in. What sets it apart in the box is generosity. The package includes a slow-close seat, a wax ring and a floor bolt set, so most buyers can install it without a second trip to the store. An extra-tall version is offered for anyone who wants a higher seat.

Owners tend to praise the strong single-flush clearing and the fact that everything needed for a basic swap is included, which reads as strong value. The trade-offs follow from the brand model. As a Home Depot exclusive, replacement internals are easiest to source through that retailer rather than any hardware aisle, and at 1.28 gallons it uses more water per flush than the Stealth, though it still qualifies as WaterSense. For a busy family bath where a complete, dependable install matters more than shaving every last drop, that is an easy trade.

• Pros: Strong 1.28 GPF vacuum-assist flush, MaP 800, WaterSense, seat and install hardware included, chair height, tall version available.
• Cons: Uses more water than the 0.8 GPF Stealth, parts tied mainly to Home Depot, house-brand rather than a specialist plumbing maker.

Check current price

Water use, MaP and certifications

This is the clearest split between the two. The Stealth flushes on 0.8 gallons, the Power Flush on 1.28 gallons, and both carry the EPA WaterSense label because both sit at or below the 1.28 gallon high-efficiency line. If you want to understand what that half-gallon difference does and does not buy you, our breakdown of 1.28 GPF versus 1.6 GPF explains why modern low-flow toilets keep their flush power while cutting water, and the same logic extends down to the Stealth's 0.8 gallon rate.

On measured flush performance the two are level. Each is listed at MaP 800, which means each cleared 800 grams of waste in a single flush during testing, comfortably above the 350 gram minimum and only two steps below the 1000 gram ceiling. That parity is the headline of this comparison. When two toilets tie on MaP and both carry WaterSense, the flush is a wash and the decision moves to water target, seat height, what comes in the box and where you buy your parts. The Stealth also lists ASME A112.19.2 and CSA B45.1 certification, standard proof that the fixture meets North American plumbing requirements.

Installation, height and fit

Fit is close between the two. Both use the common 12 inch rough-in, both come as elongated bowls in their popular versions, and both are two-piece designs, which makes them easier to carry and cheaper to repair than a one-piece since the tank and bowl ship separately. Measure from your finished wall to the center of the floor bolts before ordering either one, and confirm you have clearance for an elongated bowl in a tight powder room.

Height is a small but real difference. The Stealth sits at a 17 inch EZ Height rim, while the Power Flush comes in chair height with an extra-tall option, so a taller household may prefer the Glacier Bay tall version. Installation effort tilts toward the Power Flush because it includes the seat, wax ring and bolts, whereas the Stealth usually needs a seat purchased separately. Neither uses the sealed pressure cartridge of a true pressure-assist toilet, so day-to-day repairs stay closer to conventional gravity hardware.

Who should buy which

Choose the Niagara Stealth if cutting water is the point. At 0.8 gallons per flush it is the most frugal fixture here, it runs remarkably quiet, and it still posts a MaP 800 flush, which makes it a smart pick for drought-prone regions, well and septic setups, or anyone chasing the lowest possible water bill. Go in knowing you may buy a seat and that an ultra-low-flow bowl rewards a clean, well-sloped drain.

Choose the Glacier Bay Power Flush if you want a complete, ready-to-install package with strong single-flush clearing and easy Home Depot support. It matches the Stealth on MaP and WaterSense, includes the seat and hardware, and offers a taller seating option, at the cost of using more water per flush. Either way you are buying a vacuum-assist flusher that clears in one go, and both belong on any list of the best flushing toilets for the right home.

Related Guides

• What Is A MaP Score
• 1.28 GPF vs 1.6 GPF
• How Do Toilets Work