Best 0.8 GPF Toilets (Ultra High Efficiency)

The Aquia IV is the 0.8 GPF toilet most buyers should start with, because its 0.8 gallon light flush is among the lowest in a model whose full flush still posts a perfect 1,000 gram MaP score, so it pulls your yearly average to the floor without ever forcing a second push on solids.

The Aquia IV pairs a very low 0.8 gallon partial flush for liquids with a 1.28 gallon full flush for solids, and because most uses in a normal day are liquid only, that 0.8 gallon light flush drives the household average well below any single-volume toilet. The full flush reaches a perfect 1,000 gram MaP score using TOTO's Dynamax Tornado swirl, which feeds water through twin nozzles to scour the bowl rather than dump it down the front, so solids clear cleanly without pressing the button twice. The light flush is what lowers the meter reading, and the strong full flush is what makes the savings real.

The skirted two-piece body has smooth sides with no contoured trapway bumps to scrub, and the CeFiONtect glaze keeps the bowl cleaner between wipes. Owner reviews run deep and consistently praise the strong rinse and quiet refill, with the usual note that the top push-button takes guests and children a moment to learn. The other downside is a price above value single-flush picks. For a buyer focused on the lowest possible water average, the Aquia IV is the default 0.8 GPF choice, and it also leads our roundup of the best water saving toilets of 2026.

The St. Tropez delivers a true 0.8 gallon light flush in a sleek skirted one-piece at a level well below the premium brands, which makes it the value way into the 0.8 GPF category for a modern bathroom.

The St. Tropez pairs a 0.8 gallon partial flush, among the lowest available anywhere, with a 1.28 gallon full flush that reaches an 800 gram MaP score, so it clears solids cleanly without pressing the button twice. Its appeal is the combination of that very low water use with a contemporary low-profile design and a fully skirted base that wipes clean in seconds. The soft-close seat and the button plate are included, which keeps the package complete out of the box and adds real value.

Swiss Madison is a newer brand than the established names, so its long-term reliability record and parts depth are not as deep, and a few owners note the compact tank can refill a little slowly between flushes. Owner reviews are broadly positive on looks and flush strength, with the usual caution to confirm the bolt-down and supply connection on install. For a water-minded buyer who also wants a modern look for less, it is a strong 0.8 GPF value, and it carries over from our guide to the best low flow toilets at 1.28 GPF and under.

The T-0019 is Woodbridge's skirted dual flush one-piece, offering a designer body that looks far more expensive than it costs with a genuine 0.8 gallon light flush for buyers who want the lowest water draw and an upscale shape.

The T-0019 is a fully skirted one-piece, so the trapway hides behind a smooth side panel and the seamless body wipes clean in one pass. Its dual flush pairs a 0.8 gallon partial flush with a 1.28 gallon full flush that posts an 800 gram MaP score, enough to clear solids in one push, so the light flush lowers your average while the full flush keeps it honest. The soft-close seat is included, a real bonus at this level, and the comfort-height elongated bowl suits most adults.

Owner reviews run deep and consistently praise a clean flush, a quiet refill and the upscale skirted shape that hides the trapway entirely. The tradeoff is that Woodbridge parts are less universal than TOTO or Kohler, so a repair may mean ordering a specific mechanism rather than grabbing a generic one, and the brand sells under several similar model numbers, so confirm the exact number and the 0.8 gallon dual flush before ordering. For designer styling with the lowest water use, it is a standout 0.8 GPF choice and a regular pick among the best eco friendly toilets for a greener bathroom.

The Vespin II brings TOTO's dual flush and a skirted, easy-clean body into a two-piece that is lighter to install than a one-piece, with a low light flush near the 0.8 gallon class and a strong Tornado full flush.

The Vespin II uses TOTO's Dynamax Tornado dual flush, with a light flush near 0.9 gallons and a 1.28 gallon full flush that reaches an 800 gram MaP score, so it sits at the practical edge of the 0.8 GPF class while clearing solids in one push. Its light flush is a touch above the lowest 0.8 gallon models, but its full flush is among the strongest dual flush clears here, which is the trade that keeps double flushing from creeping in.

The fully skirted two-piece body gives the clean look of a one-piece with the lighter weight and easier handling of a two-piece during install, and the CeFiONtect glaze keeps the bowl cleaner between wipes. Owner reviews praise the powerful, quiet flush and the simple maintenance of the smooth sides. The downsides are a level above value dual flush picks and a light flush slightly above the 0.8 gallon floor. For a buyer who wants TOTO reliability and a skirted look without the weight of a one-piece, the Vespin II is a strong pick, and it features among the best EPA WaterSense certified toilets.

The Santa Rosa is Kohler's compact dual flush one-piece, fitting a 0.8 gallon light flush and a strong canister full flush into a short, space-saving body that suits powder rooms and tight installs.

The Santa Rosa pairs a 0.8 gallon partial flush with a 1.28 gallon full flush that reaches an 800 gram MaP score using Kohler's AquaPiston canister, which releases water into the bowl from all sides for a strong, even single flush. Its compact elongated bowl gives the comfort of an elongated shape in nearly the footprint of a round bowl, which is why it is a frequent choice for small bathrooms where the lowest water use still matters.

Because Kohler is sold in every big-box store, replacement seals and dual flush parts are easy to find locally for years, which is a real advantage over boutique brands, and the canister flush seals more reliably over time than a cheap flapper. Owner reviews praise the space savings and the strong, quiet flush, with the occasional note that the one-piece is heavy to set in a tight room. For a small bathroom that still wants a 0.8 gallon light flush, the Santa Rosa is the smart compact pick, and it appears in our guide to the best water saving toilets of 2026.

The H2Option is American Standard's value dual flush, pairing a low light flush with the strongest full-flush MaP score in this roundup, a full 1,000 grams, well below the premium dual flush models.

The H2Option uses a low light flush near 0.92 gallons and a 1.28 gallon full flush that reaches a 1,000 gram MaP score, the highest of any model here, driven by a wide 3 inch flush valve that dumps water into the bowl faster and harder than a standard valve. That extra clearing power means the full flush handles heavy loads as strongly as a dedicated power toilet, so double flushing on solids is off the table even with the low average a dual flush delivers.

The EverClean glazed trapway resists the buildup of stains and odor-causing bacteria, so the bowl stays fresher between cleanings, and the ten-year limited warranty is among the longest in the category. It is a comfort-height elongated two-piece with practical, utilitarian styling, so the seam and base contours need occasional wiping, and the light flush is slightly above the 0.8 gallon floor. For the strongest dual flush clearing per dollar, though, the H2Option is the clear value answer, and a frequent pick among the best EPA WaterSense certified toilets.

The Avalanche is Gerber's value dual flush toilet, a plumber favorite that delivers a genuine 0.8 gallon light flush and dependable clearing for one of the lowest costs in the 0.8 GPF category.

Despite its low cost, the Avalanche posts an 800 gram MaP score on its 1.28 gallon full flush with a wide glazed trapway, so it resists clogs about as well as toilets that cost far more while pairing it with a true 0.8 gallon light flush for the lowest average. For a hardworking or rental bathroom where the lowest water use is the goal and budget is tight, that combination of strength and value is hard to beat.

Gerber is a long-time plumber favorite because its toilets are dependable and inexpensive to service, and the simple two-piece design installs with standard fittings. The 800 gram MaP is strong but a step below the 1,000 gram leaders, and the styling is plain with an exposed trapway. For raw 0.8 GPF value per dollar, though, the Avalanche is the smart-money contractor choice, much like its siblings in our guide to the best low flow toilets at 1.28 GPF and under.

The Aquia IV 1G is the ultra-efficient sibling of the standard Aquia IV, pairing the same 0.8 gallon light flush with a reduced 1.0 gallon full flush, so its combined average is among the lowest of any toilet that still clears solids in one push.

The Aquia IV 1G drops the full flush all the way to 1.0 gallon while keeping the 0.8 gallon light flush, and it still posts a perfect 1,000 gram MaP score thanks to TOTO's Tornado swirl, which scours the bowl efficiently enough that a single gallon clears solids cleanly. That combination gives one of the lowest effective flush volumes you can buy, which is why it appeals to drought-prone regions and the most water-conscious buyers.

Because the full flush uses so little water, this model rewards good plumbing: it performs best with normal supply pressure and a properly pitched drain line, and TOTO notes it suits homes where the drain run is not unusually long or flat. The skirted body and CeFiONtect glaze match the standard Aquia IV for easy cleaning, and owner reviews praise the savings, with the occasional reminder to confirm your drain line before choosing the 1.0 gallon version over the 1.28. For the absolute lowest combined average with a clean clear, the Aquia IV 1G is the pick, and it leads our roundup of the best eco friendly toilets for a greener bathroom.