Best 0.8 GPF Toilets: Ultra Low Flush Picks 2026

The TOTO Aquia IV is the benchmark 0.8 GPF dual-flush toilet, achieving MaP Premium certification with a 1,000-gram score on the 1.28 GPF full flush and delivering reliable liquid-waste removal at 0.8 GPF.

The Aquia IV uses TOTO's TORNADO FLUSH system, which directs water through two nozzles in a cyclonic pattern rather than a traditional rim-hole ring. This design concentrates flushing energy and cleans the bowl with less water. CEFIONTECT, TOTO's proprietary ion-barrier glaze, is applied to the porcelain surface to minimize particulate adhesion, which reduces how often the bowl needs scrubbing and helps maintain consistent flush performance over time.

Owner reviews consistently highlight that the 0.8 GPF cycle handles liquid waste and light solid loads effectively, and the 1.28 GPF cycle handles everything else without requiring a second flush. California and Texas installations report passing local water audit inspections when these units are installed. The two-piece configuration makes shipping and installation straightforward compared to one-piece alternatives at this performance tier.

Niagara's Stealth technology uses an air-transfer system that channels air from the bowl into the tank to assist the downward pull of water, allowing a clean 0.8 GPF single flush that clears the bowl without the gurgling noise typical of standard gravity toilets.

The Niagara Stealth's air-transfer mechanism is its defining technical feature. Rather than relying purely on gravity to accelerate the flush water, it uses pressure created as air moves from the bowl to the tank, adding velocity to the flush column. The result is a flush that moves faster and more completely than a simple gravity pour at the same water volume. Users in apartments and condominiums with shared walls specifically cite the noise reduction as a notable daily quality-of-life improvement.

The 800g MaP score means this unit handles typical household waste loads reliably. Owners with large households note that heavy loads occasionally require a second flush, but light-to-moderate use patterns rarely encounter that situation. The standard two-piece design keeps parts replacement accessible: fill valves and flappers for this model are widely available at hardware stores.

The American Standard H2Option brings dual-flush functionality to an accessible price point, operating at 0.92 GPF for liquid waste and 1.28 GPF for solid waste, with an 800g MaP score confirming real-world solid waste removal performance.

American Standard's EverClean antimicrobial glaze inhibits bacterial growth on the bowl surface. While this is primarily a hygiene feature rather than a flushing performance factor, it reduces cleaning frequency and maintains bowl cleanliness between flushes. The 2-1/8 inch trapway is fully glazed, which is above the minimum industry standard and reduces the likelihood of partial clogs from typical residential waste loads.

The H2Option's 0.92 GPF liquid flush is technically above the 0.8 GPF threshold, but it sits well below the 1.28 GPF WaterSense limit and represents meaningful savings for households that primarily use the lighter flush cycle. Owner reviews rate satisfaction high for the combination of price point, brand reliability, and water savings relative to what they replaced. Part availability through big-box retailers makes long-term ownership straightforward.

The Swiss Madison Ivy delivers a contemporary skirted one-piece profile with a 0.8 / 1.28 GPF dual-flush system at a mid-range price point, combining design appeal with EPA WaterSense certification, though its 600g MaP score makes it better suited to lighter household loads.

Swiss Madison markets primarily to design-conscious buyers, and the Ivy delivers on aesthetics with a clean skirted base, top-mounted dual-flush actuator button, and elongated bowl. The skirted profile hides the trapway and creates a smooth exterior surface that wipes down quickly. These design advantages are genuine functional benefits, particularly in bathrooms where cleaning convenience matters.

The 600g MaP score is the trade-off. For one or two occupants with typical waste loads, 600g is adequate. Families of four or households with heavy daily use will find this unit requires occasional double flushing. Swiss Madison offers a one-year limited warranty, which is shorter than TOTO's industry-leading coverage. Replacement parts are available directly through the brand and through select online retailers.

TOTO's compact elongated Aquia IV one-piece maintains the full MaP Premium flush performance and TORNADO FLUSH system of its standard counterpart while fitting in spaces where standard elongated bowls are too long, making it a rare find in the 0.8 GPF tier.

The compact elongated bowl format gives users the seated comfort of an elongated bowl (wider and longer than a round bowl) in a shorter overall package. TOTO achieves this by reshaping the bowl profile without reducing internal capacity or trapway dimensions, so flush performance is not compromised. The TORNADO FLUSH's two-nozzle design remains identical to the standard unit.

One-piece TOTO units command a price premium but remove the most common toilet leak point, which is the gasket between the tank and bowl on two-piece models. For a bathroom renovation where the toilet is going to be in service for 20 or more years, the reduced maintenance probability has real value. TOTO's warranty coverage and parts availability through authorized distributors extend that reliability argument.

The round-bowl Niagara Stealth brings the same 0.8 GPF air-transfer flushing technology to a smaller footprint, making it a practical choice for powder rooms, small apartments, and secondary bathrooms where space is constrained.

Round-bowl toilets measure approximately 2 inches shorter in depth than equivalent elongated models, which matters in bathrooms where the door clearance is tight or the rough-in configuration leaves limited space in front of the bowl. The Stealth technology functions identically regardless of bowl shape, so the flush performance characteristics from the elongated version transfer directly.

Landlords and property managers report that the noise reduction is a meaningful tenant satisfaction factor, particularly in single-story apartments and condominiums. The 800g MaP score handles typical tenant waste loads reliably without service calls related to flushing performance. Niagara's warranty for residential installations covers manufacturing defects, though the exact terms should be confirmed with the manufacturer at time of purchase.

The Woodbridge T-0001 offers a sleek skirted one-piece profile with top-mounted dual-flush actuator, delivering a 1.0 GPF / 1.6 GPF system that falls outside the strict 0.8 GPF tier but earns inclusion here for remodelers who want the design aesthetic of a modern one-piece at a lower water volume than legacy 1.6 GPF toilets.

Woodbridge has built a strong reputation for delivering one-piece skirted-design toilets at prices significantly below TOTO's comparable models. The T-0001 is their flagship and most reviewed product. Owners consistently report that the soft-close seat performs well over time, the skirted base is easy to clean, and the 800g MaP flush clears standard household loads in a single flush at the 1.6 GPF setting.

For buyers who specifically need EPA WaterSense certification or true 0.8 GPF performance, the T-0001 does not qualify. It belongs on this list as a design-forward alternative that uses meaningfully less water than the 1.6 GPF toilets it typically replaces, and it often appears in bathroom renovation projects alongside water-efficient fixtures from other categories. See our best eco-friendly toilets guide for additional context on certification requirements.

The Gerber Avalanche uses a Flushmate pressure-assist vessel inside the tank to deliver an explosive flush at 1.0 GPF, clearing 1,000 grams per flush in MaP testing and making it the most powerful low-GPF toilet in this roundup for households that have struggled with chronic clogging.

Pressure-assist flushing uses compressed air stored in a sealed vessel inside the tank. When the flush valve opens, that compressed air drives water into the bowl at higher velocity than gravity alone achieves. Gerber's Avalanche configuration channels that pressurized flush through a siphon jet positioned at the base of the bowl, producing a very rapid, thorough clearing action. The 1,000g MaP score at 1.0 GPF confirms that this mechanism delivers on its design intent.

The primary drawback is noise. Pressure-assist toilets produce a distinctive, louder flush sound compared to gravity and stealth options. In open-plan homes or thin-walled apartments, this can be a real consideration. Households that have clogging problems with existing low-flow toilets often find pressure assist eliminates those problems entirely. See our best pressure-assisted toilets guide for a full comparison of this category.