The main flush types you’ll see in a TOTO smart toilet are dual flush, full and half flush, as well as automatic sensor-activated flushing on selected models. Most models are designed for water efficiency, typically operating at around 4.5L full flush and 3L half flush, with some advanced models using as little as 3.8L full flush and 3L half flush, depending on the series and flush setting.
Smart Toilet Flush Types and Water Use
Smart toilet features tend to get all the attention (heated seat, bidet washing, dryer, deodoriser), but the flush system is still the core of day-to-day performance. The flush type determines three things that matter in real life: how clean the bowl stays, how reliable the toilet is under different household use, and how much water you use every day.
TOTO’s smart toilet ecosystem generally combines two ideas:
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Efficient flush volumes (often dual flush).
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Automation and hygiene features that reduce touch points and reduce residue in the bowl.
Below is a practical breakdown of the main flush types, how water use is usually rated, and how these features show up across TOTO smart toilet configurations like WASHLET+ toilets and integrated smart toilets such as NEOREST NX2.
The most common smart toilet flush type: Dual Flush
Dual flush means you get two flush volumes: a higher volume for solids and a lower volume for liquids. In Australia, modern water-efficient dual flush toilets typically use around 4.5 L for a full flush and ~3 L for a half flush, delivering strong performance while keeping water consumption low.
In TOTO’s smart toilet range you’ll frequently see water-efficient dual flush systems rated at approximately 4.5 L / 3.0 L on many models, including integrated smart toilets like the Neorest NX series sold here, aligning with Australian WELS water efficiency expectations.
Why dual flush matters
Dual flush is simple but powerful. In most households, a large percentage of flushes are liquid-only, so the “light” flush can lower overall water use without forcing you into weak performance. This is one reason efficient toilets can still perform well at around 4.5 litres per full flush or less.
How Dual Flush Works in TOTO Smart Toilets
On many setups, dual flush is controlled by:
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A top-mounted push button (two-button arrangement) on tank toilets.
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A remote control flush (full/light) when paired with certain smart seat and bowl combinations.
In other words, the “smart” part is not only that the toilet uses less water, but also that it can integrate dual flush into touchless or remote-controlled routines.
Touchless Automatic Flushing in TOTO Smart Toilets
Automatic flushing is a major selling point in many TOTO smart toilet packages because it removes one of the highest-touch moments in the bathroom. Instead of pressing a button, the toilet flushes after the user leaves, based on sensor logic and settings.
Auto Flush Features in TOTO Smart Toilet Systems
Depending on the model and configuration, auto flush can include:
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Flush triggered after leaving the toilet (user detection logic).
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Flush behaviour linked to lid or seat movement, such as closing the lid before flushing, or flushing after a timed delay if the lid is not closed.
In one TOTO owners manual for WASHLET-related systems, auto flush timing is described as adjustable, with examples like flushing about 25 seconds (short), 30 seconds (standard), or 35 seconds (long) after leaving, depending on settings.
That is the “smart” part in a very practical sense: the toilet is not just flushing automatically, it can be configured to match how people use the bathroom.
How Smart Auto Flush Systems Manage Water Use
Auto flush does not necessarily increase water use. It depends on how the household behaves.
Auto flush can reduce “forgotten flushes” and reduce double flushing that happens when someone tries to avoid touching buttons, but it can also increase water use in edge cases if the sensor triggers unexpectedly. The key is correct setup and installation so the sensor zone behaves predictably.
Remote Control Flushing at Your Fingertips
Many TOTO smart toilet and WASHLET-related configurations include remote control flushing options, typically offering Full flush and Light flush buttons.
Why this matters
Remote flush supports:
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Accessibility for users who find traditional flush controls awkward.
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Cleaner routines since users are not touching a lever or button on the toilet itself.
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Better use of dual flush since the “light flush” option is clearly presented.
It also pairs naturally with auto open/close lid features and other automation.
What happens to the flush if power is out?
One concern with smart toilets is reliability during outages. Many smart toilets include ways to flush even if power is interrupted, either by design of the flush system or via backup mechanisms.
In TOTO’s NEOREST NX2 documentation, you will see references to auto features and also back-up manual flush listed in a spec sheet.
What to take from this
When evaluating smart toilets, it is not enough to confirm that it has auto flush. You want to know:
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Is there a manual fallback?
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How is it activated?
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Does it require any special access panel or procedure?
Those details can vary by model and installation type.
Tornado Flush and 360-degree cleaning power
Flush type is not only “auto vs manual” or “dual vs single.” The actual bowl-wash pattern matters, especially in smart toilets where the goal is to keep the bowl clean with fewer chemicals and less brushing.
TOTO commonly uses its Tornado Flush systems (including variants like DYNAMAX Tornado Flush) which are described as utilising 360-degree cleaning power to reach every part of the bowl.
Why this matters in daily use
A bowl-wash pattern designed to sweep more of the bowl can help with:
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Reducing streaking.
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Maintaining cleanliness with lower water volumes.
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Keeping the bowl looking clean between deeper cleans.
This is a functional reason many people feel a premium toilet “stays cleaner,” even before you factor in smart features like pre-misting or specialty glazing.
Understanding Water Use Ratings
Toilet water use is expressed in litres per flush (LPF) and shown on the product’s WELS label, which also includes a star rating indicating water efficiency. Toilets must be tested and labelled under the Water Efficiency Labelling and Standards (WELS) scheme, and are legally required to meet these standards before they can be sold here.
Under WELS, the figure shown on the label tells you how much water the toilet uses per flush (full and half flush for dual-flush models). Modern water-efficient toilets in Australia typically use around 4.5L for a full flush and about 3L for a half flush, significantly less than older conventional toilets that used around 11–12L per flush.
Choosing a higher WELS-rated toilet (with more stars and lower litres per flush) can noticeably reduce household water usage and lower water bills, while still delivering strong flushing performance.
What this means for TOTO smart toilets
Many TOTO models and configurations you’ll see in the smart-toilet category fall well within Australia’s water-efficient range. This is because most of them use dual flush systems with typical water-use figures of about 4.5 L for a full flush and 3 L for a half flush, which meets WELS water-efficiency requirements and helps keep water consumption low.
For example, popular smart-toilet models like the NEOREST RS and NEOREST AS feature water usage around 4.5 L / 3 L dual flush, and this same pattern is seen across many TOTO integrated smart toilets sold in Australia.
The practical takeaway is that “smart” does not mean “wastes water.” In many cases, TOTO smart toilets are among the more water-efficient models available, because efficiency is a strong selling point in the premium segment of the market. Their advanced flushing technologies deliver powerful performance while keeping water use low, aligning with what Australian homeowners expect from high-efficiency toilets.
How to choose the right flush type for your household
Choose dual flush if you want the best balance of efficiency and simplicity
Dual flush is straightforward, requires minimal learning, and can reduce water use without requiring lifestyle changes. It is often the safest pick for most homes.
Choose auto flush if touchless hygiene and convenience are a priority
Auto flush is especially appealing for:
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Busy households
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Guest bathrooms
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Users who prefer touchless operation
To get the best experience, confirm that the auto flush behavior is adjustable and that you understand its trigger logic.
Choose higher-efficiency flush ratings if water savings are a major goal
If you are water-conscious, comparing 1.28/0.9 versus 1.0/0.8 can be meaningful over time, especially in high-use bathrooms.
Do not ignore the “non-flush” features that keep the bowl cleaner
Even though this article is about flushing, many TOTO smart toilet lineups combine flushing with features designed to reduce residue and cleaning. For example, NEOREST NX2 spec documentation highlights a combination of the Tornado Flush system and other cleaning-related technologies, along with auto open/close lid.
Common mistakes when writing about smart toilet flush types
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Treating auto flush as the only smart flush - Dual flush plus a strong bowl wash pattern is often the bigger day-to-day win.
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Skipping the water use numbers - Readers want to know the actual water consumption. In Australia, that means quoting litres per flush under the WELS scheme, not gallons. Most modern smart toilets operate at approximately 4.5L / 3L dual flush, and some highly efficient models may reduce the full flush slightly further while maintaining performance.
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Not mentioning manual fallback - Smart does not mean fragile, but people worry about outages. If the model supports backup manual flushing, it is worth calling out.
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Ignoring user settings and timing - The ability to adjust auto flush behaviour is a real functionality benefit and helps avoid accidental triggers.
TOTO smart toilets in Australia typically offer dual flush systems designed for water efficiency, with most models operating at approximately 4.5L full flush and 3L half flush under the WELS scheme. These volumes meet Australian water-efficiency requirements while maintaining strong flushing performance.
Premium integrated models also incorporate automatic flushing, including sensor-activated auto flush and remote flush controls, often with adjustable timing settings for convenience and hygiene.
To support consistent bowl cleaning while using less water, TOTO pairs these controls with advanced flushing technologies such as Tornado Flush, which uses a powerful, cyclonic rinsing action to clean the bowl more thoroughly and efficiently.
The result is a system where “smart” features enhance hygiene and usability, without increasing water consumption.
Where to Buy Quality Smart Toilets in Australia
Smart toilet features can sound impressive, but performance ultimately comes down to verified specifications. Flush volume, WELS rating, bowl design, sensor logic, manual backup systems, and internal flushing technology vary significantly between models and brands.
Austpek Bathrooms has supplied premium bathroom products to Australian homeowners for over 20 years. Through our e-commerce platform, homeowners can compare TOTO smart toilet configurations including WASHLET+ combinations and fully integrated models like the NEOREST series, with clear information on dual flush ratings, auto flush capabilities, Tornado Flush systems, and WELS water efficiency compliance.
For high-value renovations, understanding how the flush system performs, how much water it uses, and how it operates during everyday use is just as important as the comfort features. Clear specifications and proper guidance ensure you choose a smart toilet that delivers hygiene, reliability, and long-term efficiency.
