Dual-flush toilets promise the best of both worlds: a light flush (usually 0.8–1.1 gallons) for liquids, a full flush (1.28–1.6) when you need it. In a country where many municipalities meter water and some still offer efficiency rebates, the math is genuinely good — a family can save thousands of litres a year without changing a single habit. Here's how to buy one you'll be happy with.
What to look for beyond the two buttons
- Bowl-wash quality on the light flush. Cheap dual-flush designs clear the trap but leave the bowl streaky, so everyone ends up using the full flush anyway. Rimless cyclonic designs (like TOTO's Dynamax Tornado) keep the bowl clean even on 0.8 gallons — the single biggest quality difference between brands.
- Flush actuation. Top-mounted dual buttons are the classic; TOTO's Aquia line uses them, while some models offer side levers with two positions. Wall-hung systems put dual buttons on an elegant wall plate.
- MaP scores for the FULL flush. A dual-flush toilet is only as good as its big flush — look for 800g+ ratings (our MaP guide explains the numbers).
The Canadian shortlist
- TOTO Aquia IV (1.28/0.9 GPF) — the category leader: skirted, rimless Tornado wash, quiet, WASHLET+ ready. If in doubt, this is the answer.
- TOTO Aquia IV 1G — the same toilet pushed to 1.0/0.8 GPF for maximum savings.
- Caroma Sydney Smart II — the Australian dual-flush pioneers; ultra-efficient 1.28/0.8 with a proven washdown design and easy-height bowl.
- Geberit in-wall systems — dual-flush plates paired with any wall-hung bowl; the design-forward route (see our wall-hung collection).
- American Standard H2Option — the value dual-flush in a familiar two-piece format.
All are in our toilets collection alongside their spec sheets.
Dual flush vs. a great single flush
An honest caveat: a modern 1.28 GPF single-flush like the TOTO Drake is already extremely efficient, and its one perfect flush suits households that will never train guests on two buttons. Choose dual flush when water bills or sustainability targets matter and you like the tech; choose an excellent single flush when simplicity wins. Either way you're far ahead of the 6-litre-plus toilets Canadian homes were built with.
Frequently asked questions
Do dual-flush toilets clog more?
Quality ones, no — the full flush on an Aquia IV or Sydney Smart II outperforms most older single-flush toilets. Budget no-name dual-flush units earned the reputation.
Which button is which?
The smaller button (or half-moon) is the light flush. Kids figure it out faster than adults.
Are rebates available?
Several Canadian municipalities and utilities run periodic high-efficiency toilet rebates — check your city's water utility page before buying; most require the model to appear on their qualified list.