Best 6 Dual Flush Toilets with Partial Flush – Save Water Review

For liquid waste, you simply press the smaller button and hold it for a short period of time.

For solid waste, you will either press the larger button or press both buttons together, depending on the toilet, which will activate a full flush.

If the small flush is not enough, you can immediately press the large button. However, it might take some time to refill the cistern after the small flush. Depending on the pipes, it can take a few seconds or even up to several minutes before you can flush again, like other toilet models. However, if you’re focused on reducing water use, try to avoid flushing multiple times if possible.

You may also encounter a dual-flush toilet that has a lever instead of buttons. Even though the mechanism is different, the principle is the same – press the lever halfway down for a small flush and all the whole way down for a full flush.

This video fully describes the dual flush process including button options and pro/cons you should know before making a purchase decision.

The Kohler series is known for its exceptional flushing performance, and the Wellworth toilet is no different. 

It features a left-side nested trip lever that allows you to conveniently flush the toilet, even while sitting on it, and thankfully, we’ve not received any complaints on splashbacks like most toilets, which is probably why Amazon highly rates this one.

The Wellworth toilet is a classic, using the Class Five® dual flush system, well known for its bulk flushing performance. Its 1.6/1.1 gallons per flush system is WaterSense-approved, and you might be getting rebates on your water bills with this toilet. 

Its flush system comprises a direct-fed siphon-jet flush, a 2 1/8 inch, fully glazed trapway, and a large round canister valve. The canister valve and siphon jet deliver a quick, powerful water gush from all sides of the bowl, and the glazed trapway works with the siphoning system to forcefully but quietly expel the waste. 

The canister valve also reduces leakages by protecting the seal, a definite upgrade from the 3-inch flapper, and the tank fills up pretty quickly.

However, we can’t quite wrap our heads around how a Class Five® flush system gets clog complaints. Could it be a trapway issue? We can’t tell, but some customers have complained the toilet gets clogged, and sometimes they have to flush twice to clear the waste. 

Another thing is the leak-proof valve isn’t as efficient as we thought. A few users claim it does not last, and water leaks from the tank into the bowl, a flaw in its water efficiency. It relies mainly on a high gloss finish for anti-stick performance. Now, we know this is quite a lot. But a more comprehensive review would help give a better, final judgment on this piece.

Color Choices:

• White (0)
• Biscuit (96)
• Black Black™ (7)

All Drake models are coated with the CEFIONTECT® glaze, making it almost impossible for waste and other residues to stick to the bowl, further enhancing its hygiene quality. But, the TOTO Drake dual flush goes a step further, a possible reason for its higher price. 

The dual-flush TOTO Drake models address the high water usage of the Drake toilets. Its 0.8/1.0 gallons per flush offering makes it WaterSense compliant and suitable for residents in all states.  

This toilet features the  TORNADO FLUSH® system , which expels water from the tank through 2 powerful nozzles instead of the standard rim holes. Add that to its extra-large 2 1/8 – inch, semi-concealed, fully-glazed trapway, and it becomes clear why it is the Most efficient.

The faster the water enters the bowl, the stronger the siphoning effect in its trapway. The stronger the siphon power and the larger the trapway, the better the cleaning power and the lesser the clog and discoloration risk. 

Other exciting features of this toilet include: the relatively quiet and discreet flush and the fast-filling tank – it takes just about 35 seconds. Its large water surface reduces the incidents of streaking and skid marks and curtails the odor of turds. 

Unfortunately, some customers have complained that the ridge in the bowl gives the impression of an ugly, bad stain. 

So, if this Drake doesn’t seem right for you, check out the TOTO Drake II. It has a better water system and design.

Color Choice:

• Cotton (#01)

The Drake Washlet®+ is among the best bidet innovations of the TOTO company. Although it has a lot in common with the Aquia IV, it has various unique, high-tech features.

Unlike most dual-flush toilets, the TOTO Drake + Washlet® S500e uses the DynaMax™ tech. This technology utilizes 1.28GPF for a full flush and 0.8GPF for a partial flush. It has WaterSense certification and could be quite economical. 

Now, despite having a side-positioned chrome trip lever, the S500e has an automatic flush system that you can activate once you’re done with the remote control. 

One exciting thing we love about this toilet is how it addresses hygiene in a high-tech and even more efficient way. 

While it features the common CEFIONTECT® glazing, it uses electrolyzed water in its flush system, which cleans the bowl even better than regular water. But, it doesn’t wait till the action is done. Before use, this toilet has a premist function that sprays the bowl with electrolyzed water to deter waste, residues, and other materials from sticking to the bowl. 

To say these are what make this toilet unique would be to undermine the TOTO Drake + Washlet® S500e totally. There are many other features we can guarantee you would not see in just any toilet – a clear explanation of why S500e is one of the more expensive bidet pieces.

Color Choices:

• Cotton (#01)

The new American Standard H2Option is – in our opinion –  one of the best dual flush toilets . As an upgrade from the former H2Option, this toilet is more water-efficient, EPA-certified, and more consumer-centric than the last.  

There is less need to fumble around searching for a lever or a button with this toilet because it has a large chrome-plated push-button actuator at the top of the tank. This actuator controls the two flush valves, which regulate the release of either the full 1.28 gallons per flush or a partial 0.92 gallons per flush. 

We love how this toilet doesn’t settle for less. It merges a siphon-jet (gravity) bowl with a PowerWash® rim that delivers water in a quick surge to all areas, even those hard-to-reach regions. It scours the bowl, so no area is left un-rinsed. 

The new American Standard H2Option is another fast-filling tank toilet, so you don’t have to wait for too long before giving the flush another go when you need to. Its EverClean® surface is most lovely because it contributes to the bowl’s spotlessly clean tendency and eliminates nasty bacteria that cause odors even deodorizers would have a hard time neutralizing. 

Combating the common problem of clogs, the new H2Option has a 2-inch wide, fully glazed trapway to expel waste faster and without residues. 

The tank refills quickly, and its EverClean® surface ensures the bowl remains spotlessly clean and free from smells that even deodorizers might find difficult to neutralize. Its 2-inch wide trapway is also fully glazed to prevent clogs and waste residues. 

Unfortunately, despite its gravity flush system, some customers have complained this toilet does not clear out waste in a single flush. For a more comprehensive review on the new American Standard H2Option, you should check out this post.

Color Choices:

• White
• Bone
• Linen

The Swiss Madison St. Tropez is considered one of the best one-piece toilets of the present time because it offers the benefits of space management, aesthetic excellence, and water maximization. 

The St. Tropez is factory tested, EPA certified, and WaterSense approved. It offers premium water-management quality by featuring a proportionate dual flush option of 1.6 and 1.1 gallons per flush. Thus, you do not have to worry about not being able to use the toilet in your region. 

Now, this is not so relevant, but we almost got confused writing this review with its interchangeable form, “Swiss Madison Well Made Forever SM-1T254.” So, we thought this might help. The above name refers to the St. Tropez as well. 

Back to business – The St. Tropez features buttons on the top of the tank which you can use to activate its dual tornado flush system and have the waste successfully run through the smooth, skirted, large trapway. 

The dual tornado (Vortex™) flush comprises two nozzles that expel water in a cyclonic action through the bowl and down the trapway for better cleaning action. The great part is it gets the job done relatively quietly. As a result, the SWISS MADISON St. Tropez is powerful enough to clear the waste and quiet enough to remain under wraps. 

The St. Tropez also has a fully glazed system that extends from its bowl to its skirted trapway to ensure residues, streaks, and dirt do not affect its shiny coat and sanitary quality. 

Unfortunately, we’ve seen complaints about its flush system being quite messy – “it flushes with a splash.” So unless you close the lid, the toilet water might end on your bathroom floor. Then, a few users claim a single flush never does the trick. But, again, don’t judge a toilet by its flush system alone. Let’s talk comfort. Check this full review of the SWISS MADISON toilets for more information.

Color Choices:

• White (SM-1T254)
• Matte Black (SM-1T254MB)
• Matte White (SM-1T254MW)
• Bisque (SM-1T254BQ)

The dual-flush system is actuated by a large button on its lid that can be pressed fully to use  1.28 gallons per flush for solids flush or halfway to use 0.8 gallons per flush for fluids flush . It is, therefore, EPA WaterSense-certified and CalGreen-compliant. This means, regardless of your region, this toilet fits the standard.  

It uses the DynaMax® Tornado Flush with an extra-large flush valve and two powerful nozzles that allows electrolyzed water to enter the bowl faster and with more force for better bowl scouring power.

Now, you’d expect a flush as powerful as this to make a lot of noise, but it doesn’t. Consumers have attested to its flush being relatively noiseless. 

However, this toilet lacks quality in some aspects: Consumers complain about the chrome button not lasting and the low water flush affecting its anti-stick and sanitary quality. Still, we’d advise you not to judge yet. Check out its other features before making your choice.

Color Choices:

• Cotton (#01)
• Sedona Beige (#12)
• Bone (#03)
• Colonial White (#11)
• Ebony (#51) – Without CEFIONTECT®