Fienza Kaya Tornado Flush Back-to-Wall Toilet Suite

In Australia, toilets carry a WELS (Water Efficiency Labelling and Standards) rating from 1 to 6 stars. Most modern wall faced toilet suites achieve a 4-star rating or higher, using 4.5/3L dual flush. Some premium models like the Caroma Cleanflush range achieve 5 stars with as little as 3/4.5L per flush. A higher WELS rating means lower water bills and less environmental impact.

A rimless toilet has no inner rim channel under the bowl's lip. Traditional rimmed toilets have a concealed channel through which water flows during flushing, this channel is difficult to clean and can harbour bacteria and limescale. A rimless toilet flushes water directly across the entire bowl surface in a powerful swirling action, ensuring a thorough clean with every flush and leaving no hidden areas for bacteria to grow.

A behind-the-wall toilet (also called an in-wall or concealed cistern toilet) has the cistern hidden inside the wall cavity behind a finished panel, with only the toilet pan and a flush button plate visible on the wall face. The result is an extremely clean, minimal look with no exposed plumbing, one of the most popular choices in contemporary Australian bathroom design.

The cistern is housed in a pre-fabricated in-wall frame (called a carrier frame or in-wall system), which is installed by a plumber before the wall is tiled or sheeted. The flush button on the wall face connects via a pneumatic or mechanical system to the cistern inside the wall. Brands like Geberit are the industry standard for in-wall frames in Australia, known for their reliability and long service life.