In-wall Cisterns

An in-wall cistern is installed inside the wall behind the toilet pan, creating a clean and modern bathroom aesthetic while maximising space.

Yes, Expella's exclusive range of in-wall cisterns include have Odourless by Expella pre-installed, helping ensure toilet odours never leave the bowl.

Odourless by Expella is integrated into the cistern and works using specially designed ventilation that extracts air from the toilet pan, discharging it it into the sewer. The award-winning design includes a non-return valve so that smells can't return. Odours are actively removed at the source, before they can escape into the bathroom.

Expella's range of in-wall cisterns include options designed for floor mounted pans or wall mounted pans. A range of compatible pans are available to suit different bathroom aesthetics and personal preference. View the cistern product pages for more information.

Yes, a compatible flush plate is required to complete an in-wall cistern installation. Flush plates come in a range of designs and finishes to match your bathroom aesthetic and hardware choices.

Yes, in-wall cisterns by Expella are commonly used in modern bathroom renovations where a concealed cistern is preferred.

Yes, concealing the cistern inside the wall helps maximise usable bathroom space, and reduces visual clutter and makes cleaning easier.

Yes, the Odourless by Expella system comes pre-installed inside cisterns by some of Australia's most loved and trusted bathroom brands including Caroma, Argent, Geberit and Milu Odourless

The cistern must be installed by a qualified plumber in accordance with AS/NZS 3500. Installation is the same as a regular cistern and requires the addition of an electrical power source for the Odourless by Expella system. Have a qualified electrician install a general power outlet within 3.5 meters of cable length to the cistern. Brackets are included with cisterns for wall-mount pans.

The Odourless by Expella system is secured within an ultrasonically welded ABS plastic case and does not require maintenance. As with all electrical products, access to the adaptor is recommended. All cistern components (inlet valve, flush valve and Odourless by Expella system) are accessible by removing the flush plate.

Expella recommends that the Odourless by Expella system switches on and off with the Expella PIR Motion Sensor or with the bathroom light, it can also be shared with the exhaust fan switch or by a designated switch depending on preference.

Expella's range of in-wall cisterns fits a 90mm wall cavity with 600mm stud spacing. Refer to the individual product fact sheets for detailed dimensions.

The Odourless by Expella system uses a small fan installed in the cistern to extract air from the toilet bowl, this fan is faintly audible when in operation. The sound is slightly higher pitched than a ceiling exhaust fan due to its size, however it is quieter than a celling fan and far more effective at removing odour than a ceiling fan or inline exhaust system. We recommend that the Odourless by Expella system is only switched on when the toilet is in use, it should not run 24/7. It can be activated using our PIR Motion Sensor Ceiling Switch or a regular wall switch. Refer to our product fact sheets for noise data and switching information.