Best Dual Flush Toilets: Water Saving Power

The Aquia IV is the dual flush toilet we recommend first because it delivers the lowest practical light flush with a full flush still strong enough that double flushing is rare, all in a clean skirted body from the brand that defines flush quality.

The Aquia IV uses TOTO's Dynamax Tornado flush, which feeds water through two angled nozzles to create a swirling rinse rather than dumping it down the front of the bowl. That centrifugal motion scrubs the bowl on every push and lets the 1.28 gallon full flush reach an 800 gram MaP score, while the 0.8 gallon partial flush is among the lowest light flushes you can buy. Because most daily uses are liquid only, that small flush pulls the household average well below a flat 1.28 gallon single flush model.

Owners consistently praise the strong rinse, the quiet refill and the fully skirted two-piece body, which has smooth sides with no exposed trapway contours to scrub. The CeFiONtect glaze keeps the bowl cleaner between wipes. The main downsides are a higher price than value picks and a top push-button that takes guests a moment to learn. For most households that want the lowest water use without giving up a clean single flush, this is the default choice.

The St. Tropez is the pick for the lowest possible water draw with modern styling, a sleek skirted one-piece whose dual flush light mode sips just 0.8 gallons at a price well below the premium brands.

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.

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 value and a frequent pick among the best eco friendly toilets.

The San Souci is Kohler's low-profile dual flush one-piece, and it lands the best balance of price, water savings, looks and nationwide parts support of any pick on this list.

The San Souci uses Kohler's canister-style AquaPiston dual flush, which releases water into the bowl from all sides rather than a single point, giving a strong, even rinse on a low water volume. The 0.8 gallon partial flush keeps the daily average low while the 1.28 gallon full flush reaches an 800 gram MaP score, clearing the bowl in one push. Its low-slung, compact one-piece shape suits a small or modern bathroom and wipes clean with no tank seam.

Because Kohler is sold in every big-box store, replacement seals, fill valves and the dual flush button assembly are easy to find locally for years to come, which is a real advantage over boutique brands. The canister flush also seals more reliably over time than a cheap flapper, reducing the running-toilet leaks that plague poorly made dual flush valves. It is round-front and compact, so very tall users may prefer an elongated model. For a dependable dual flush with the easiest parts availability here, it is the smart value buy.

The T-0019 is the sleek skirted dual flush one-piece that built Woodbridge's reputation, offering a designer body and a strong full flush at a price well below the premium brands.

The T-0019 is a fully skirted one-piece with a dual-flush button plate, so the trapway hides behind a smooth side panel and the seamless body wipes clean in one pass. It uses a 1.0 gallon partial flush and a 1.28 gallon full flush, and the full flush posts a strong 1000 gram MaP score, the highest in this group, so it clears heavy loads while the lighter flush trims daily water use. The soft-close seat is included, a genuine bonus at this price.

Owner reviews run deep and consistently praise a clean flush, a quiet refill and the upscale skirted shape that looks far more expensive than it costs. The tradeoff is that Woodbridge parts are less universal than TOTO or Kohler, so a repair may mean ordering a specific dual flush mechanism rather than grabbing a generic one, and the brand sells under several similar model numbers, so confirm the exact number before ordering. For designer styling with real water savings and a top full flush, it is a standout, and it carries over from our roundup of the best water saving toilets.

The H2Option is American Standard's dual flush built around clearing power, pairing a strong siphonic full flush with the brand's clog-resistant glazed trapway for buyers who refuse to compromise on solids clearance.

The H2Option uses a siphonic dual flush with a fully glazed EverClean trapway, and its 1.28 gallon full flush reaches a top 1000 gram MaP score, the highest tier any toilet hits, so it clears heavy solids in a single push without the double flushing that ruins dual flush savings. The 0.92 gallon partial flush is a touch higher than the 0.8 gallon leaders but still drops the daily average well below a single flush model.

Owners with a clog history favor the H2Option because the strong full flush and glazed trapway resist the buildup that narrows a passage over time, and the ten-year limited warranty is among the longest in the category, signaling confidence in the build. It is the dual flush to choose when solids clearance is the deciding factor, and it features in our guide to the toilets that never clog. The slightly higher partial flush is the only real tradeoff against the pure water-savers.

The dual flush Highline is Kohler's straightforward, no-frills water-saving two-piece, delivering efficient, dependable dual flushing without any complexity and with the brand's easy nationwide parts support.

The Highline dual flush reaches an 800 gram MaP score on its 1.28 gallon full flush using Kohler's durable AquaPiston canister, which feeds water into the bowl from all sides for a strong, even rinse, while the 1.0 gallon partial flush trims daily water use. It is a popular choice for whole-house remodels precisely because it is simple, proven and easy to live with across several bathrooms.

Like the rest of the Kohler line, it benefits from nationwide parts availability, so the dual flush button assembly, seals and canister are easy to find locally for years, and the canister flush is less prone to leaking over time than a cheap flapper design. The comfort-height elongated bowl suits most adults. It is a plain two-piece with a seam to wipe, so buyers who want a seamless skirted look should step to the San Souci or T-0019, but for a reliable, repeatable dual flush at a fair price, the Highline is a sensible pick.

The dual flush Viper is Gerber's value water-saver, a plumber favorite that delivers genuine dual flush savings and dependable clearing for one of the lowest prices in the category.

Despite its low price, the dual flush Viper posts an 800 gram MaP score on its 1.28 gallon full flush with a wide trapway, so it resists clogs about as well as toilets that cost far more, while the 1.1 gallon partial flush still cuts daily water use against a single flush model. For a hardworking or rental bathroom where dual flush savings are 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 partial flush at 1.1 gallons is higher than the 0.8 gallon leaders, so the savings are real but not class-leading, and the styling is plain with an exposed trapway. For raw dual flush value per dollar, though, the Viper is the smart-money contractor choice, much like its single flush sibling in our guide to the best Gerber toilets.

The Aquia IV Cube is the design-forward sibling of our top pick, bringing the same low-water Tornado dual flush into a crisp, angular skirted body for a contemporary bathroom.

The Cube shares the standard Aquia IV's Dynamax Tornado dual flush, so it pairs a 0.8 gallon partial flush with a 1.28 gallon full flush rated at an 800 gram MaP score, giving the same class-leading water savings and clean single-flush clearance. The difference is the body: squared-off, angular and fully skirted, designed to sit in a sharp, contemporary bathroom rather than a traditional one.

Owners value the same strong swirling rinse, quiet refill and CeFiONtect glaze as the standard Aquia IV, with the bonus of the distinctive cube silhouette. The tradeoffs mirror the top pick: a price above value models and a top push-button that guests take a moment to learn. For a buyer who wants the best dual flush water performance wrapped in modern, geometric styling, the Cube is the one to choose, and it suits the same design-led shopper as our best skirted toilets guide.