Best Dual Flush Toilet

Updated July 31, 2015
In this report
Toto Aquia CST416M
Best Reviewed

Best dual-flush toilet

Toto Aquia CST416M

Dual flush toilets offer good cleaning performance while saving on water

Dual flush toilets are becoming more popular with consumers because they offer the best of both worlds: water saving features plus good cleaning performance for solid waste. The "dual flush" that gives this toilet its name is the ability to choose a flush option for either solids or liquids; the solid waste flush option generally uses 1.6 gallons of water per flush (gpf), while the liquid waste option uses less than 1.1 gpf. This means that dual flush toilets will comply with the standards necessary for WaterSense certification; and may qualify for a rebate from your local water authority. You can search for utilities that offer rebates at the EPA website. All of the recommended toilets in this section are WaterSense certified.

While there are no perfect dual flush toilets -- they tend to lag in removing solid waste compared to standard toilets, which we cover elsewhere in this report -- the Toto Aquia CST416M (Est. $400 and up) comes pretty close. The Aquia earns a rating of Excellent for bowl cleaning in one professional test, but just a rating of Good for solid waste removal. It also carries a MaP score of just 500, higher than the minimum standard of 250, but well below the 1,000 score of our Best Reviewed standard toilet, the Toto Drake CST744S (Est. $245 and up).

However, owners are much more complimentary, saying that the Toto Aquia CST416M is an excellent performer both in flushing liquid and solid waste -- once you master the learning curve. Many note that you have to hold the solid waste button down for up to five seconds to get the maximum bowl cleaning performance from this toilet. The Aquia dual flush has a pushbutton flush operation that is located on the top of the tank and uses 1.6 gpf for solid waste, .9 gpf for liquid waste.

The Toto Aquia CST416M also earns high praise for aesthetics. It comes in five colors and the skirted design is reported as very attractive and modern-looking. It's also easier to clean than the traditional glazed trapway design. However, some say it's more difficult to install. The Aquia has a 15.25 inch bowl height -- which is not ADA compliant -- but it also has a slightly smaller footprint than most toilets, making it a good choice if you're squeezed for space.

Glacier Bay toilets as a brand are comparatively inexpensive toilets that are sold primarily through Home Depot, and many models do very well in professional testing. However, they don't get quite as much love from consumers, which is what keeps them out of our top spot. Still, if you're on a budget and you don't mind a fairly utilitarian-looking toilet, you may want to consider the Glacier Bay N2316 Dual Flush Toilet (Est. $120 and up). Like the Toto Aquia, the Glacier Bay earns an Excellent score for bowl cleaning, but gets a Very Good for handling solid waste in one professional test. The N2316 also has a top-of-the-tank pushbutton flushing operation, and uses 1.6 gpf for solid waste, 1.1 gpf for liquid waste.

Owners rave about the great value that the Glacier Bay N2316 represents, saying it performs very well for a very inexpensive toilet, although some say it looks like a cheap toilet. The toilet also includes a seat -- most toilets do not -- but, again, we saw complaints that the seat is cheap-feeling or broke quickly. The seat height of 16.5 is ADA compliant and the toilet comes in two colors, white and bisque.

Many people who love the idea of a dual-flush toilet absolutely hate the top-of-the-tank pushbutton operation. They say pushbuttons are harder to operate than a traditional trip-lever toilet, especially for children, or they don't like not being able to store things like tissues on top of the toilet. For them, we suggest the Kohler Wellworth Dual Flush Toilet (Est. $190 and up). It has a side-mounted trip lever that can be purchased as a right- or left-side installation. The lever is dual-action, push just the green lever for a light flush (1.1 gpf) or the full lever for a full flush of 1.6 gpf.

While there aren't a lot of reviews for the Kohler Wellworth, those we saw are highly positive. Owners say it's a very nice-looking toilet, and performs quite well in spite of using less water for solid waste removal and for bowl-cleaning.  The 14.5 inch seat height is not ADA compliant, but users say it's very comfortable -- they also love the round bowl. The Wellworth comes in four colors.

Wall-mounted and corner toilets are space-saving options

Wall-mounted toilets are very popular in Europe, but less common here. They tend to get poorer reviews for flushing performance, but are beloved for their aesthetics. Wall-hung toilets also are easier to clean than regular toilets and make it easier to clean the bathroom floor because they use an in-wall tank system, which is sold separately and will add significantly to the overall price. Because of that, installing a wall-mount toilet often requires either a fairly extensive remodel or needs to be done as part of a new structure.

However, if you have your heart set on a wall-mounted toilet and money (and/or time) is no object, we saw the best reviews for the Toto Aquia Wall-Hung Dual-Flush Toilet (Est. $225 and up); another standout in the Toto Aquia line of toilets. It's a dual-flush toilet that owners say is a top performer when it comes to flushing away solid waste, with excellent bowl cleaning. The dual-flush action uses 1.6 and .9 gpf, respectively. The SanaGloss finish is optional, and adds about $60 to the price, but most owners say it's worth it because you have to clean the toilet much less frequently. The Aquia comes in two colors (one if you opt for SanaGloss) and the toilet seat is not included

For those who have oddly-shaped bathrooms or where space is at a premium, the Barnum Dual-Flush Corner Toilet (Est. $280) may fit the bill. It's basically just a regular toilet with a triangular tank, but owners adore the way it looks in their bathroom -- many say it's become quite a conversation piece. Despite a few comments on Amazon.com about the dual-flush being "appearance only" the manufacturer, Signature Hardware, assures us that this is truly a dual flush toilet if installed properly. The Barnum corner toilet uses 1.6 gpf for solids, 1.0 gpf for liquids.

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TOTO Drake Elongated Bowl and Tank, Cotton White
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from Amazon.com
New: $402.00 $211.69   
In Stock.
Average Customer Review:  
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TOTO CST416M#01 Aquia II 2-Piece Toilet with Regular Height Bowl and Dual Max Tank, Cotton White
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from Amazon.com
New: $523.00 $278.49   
Average Customer Review:  
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Toto CT418FGNo.01 Aquia Wall-Hung Dual-Flush Toilet, 1.6-GPF and 0.9-GPF Cotton
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from Amazon.com
New: $401.00 $181.61   
In Stock.
Average Customer Review:  
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