The 'Floating' Part Is a Steel Frame Inside the Wall
Here is the whole trick: a load-rated steel frame is fixed to the floor and wall structure, the concealed cistern sits inside it, and the pan bolts onto two threaded rods at 180 mm centres. AS 1172.1:2014 requires the pan and its support, tested together, to hold 400 kg for at least 60 minutes without cracking, splitting or crazing - on our I-05 WHP the test report (A18019) records the result as 'did not crack, split or craze'. That frame, not the ceramic, is what buyers are really evaluating: wall hung systems now appear in roughly 45% of premium Australian projects, so the hidden half of the product has become the mainstream half.
What actually ships in the frame kit: the steel frame with the concealed cistern already mounted inside it, threaded fixing rods for the pan, an outlet bend, a bag of seals and fittings, and the flush plate. The addendum photo in our test report A18019 shows exactly this kit next to the pan - because the standard certifies the combination, not the ceramic on its own.
What Are the Disadvantages of a Wall-Hung Toilet?
Three real ones: higher installed cost, a mandatory in-wall frame, and far less forgiving dimension planning. A wall hung installation typically runs $2,000–3,500 once the frame, wall works and a licensed plumber (required under AS/NZS 3500.2) are counted - several times a basic floor-mounted swap.
The dimension risk is the one that catches buyers: an Australian retailer's sizing guide reports about 40% of toilet returns trace to dimension-planning errors, and rough-in compatibility is the most common sizing question of all - around 60% of size queries. One disadvantage you can cross off, though: cistern maintenance does not mean opening the wall. The flush plate removes for access to the valves - a service hatch, not a demolition.
| Floating (wall hung) | Floor-mounted | |
|---|---|---|
| Installed cost | $2,000–3,500 incl. frame and wall works | Lower - no frame required |
| Weight path | In-wall steel frame, 400 kg standard (AS 1172.1) | Floor fixing |
| Cleaning | Clear floor under the pan | Pedestal base to mop around |
| Rough-in risk | Wall set-out - least forgiving; verify from dimension drawing | Standard floor set-outs |
| Cistern access | Concealed - via flush plate | Exposed - direct |
Is a Wall Mounted Toilet a Good Idea?
A shorter way to decide. Choose wall hung when: it is a multi-room property where housekeeping minutes multiply across rooms; the project has water targets that 4-star dual flush helps meet; or the washroom walls are being built or opened anyway, so the frame goes in without extra disruption. Stay floor-mounted when: it is a single bathroom refresh on a fixed budget; the wall cannot carry a frame without structural work; or the drain set-out is in the floor and moving it kills the business case.
Do All Wall Hung Toilets Need a Frame?
Yes - every wall hung toilet needs a load-rated in-wall frame. The pan cannot be bolted straight to plasterboard, stud or brick: the 400 kg requirement in AS 1172.1 applies to pan and support together, as installed. In practice the frame and concealed cistern come as one kit; the pan is what you choose separately - which is why pairing matters. Our I-05 WHP was type-tested with the G3004 concealed cistern (WaterMark licence WMKA21189) as a set, on standard 180 mm fixing centres, so the combination is documented rather than assumed.
How Do Wall Hung Toilets Flush?
From the concealed cistern inside the wall, through the pan's rear outlet - and in Australia, almost always dual flush. Nominal volumes on the I-05 WHP are 4.5/3 L; the measured figures in report A18019 are 4.6 L full flush and a 2.9 L reduced-flush average - a 3.2 L overall average, which is the basis of its 4-star water efficiency rating (tested to AS/NZS 6400:2016). And those numbers hold across a batch for a simple reason: every pan is water-tested at the factory before packing - 100% of units, not a sample.
Floating, Wall Hung or Wall Mounted: Which Term Goes in the Spec?
Use wall hung pan when talking to trade suppliers and in hydraulic schedules - it is the term certification schedules use, so documents match. Write wall hung toilet in client-facing specifications and retail listings. Expect end clients and search bars to say floating toilet - and expect all three to mean exactly the same product. Getting the term right costs nothing; it just makes sure the certificate, the schedule and the purchase order all describe the same item.
Buying for a Project? Three Things Before the Deposit
Confirm the frame's load rating and the pan-cistern pairing in writing; take rough-in numbers (fixing centres, outlet, projection) from a dimension drawing, never a listing photo; and ask for the WaterMark schedule page that lists your exact model - for our pan that is certificate WMK26227, valid to 10 July 2027. If a floating toilet fits your specification, the model behind the numbers in this article is the rimless wall hung toilet (I-05 WHP) - MOQ 50 sets, 35–45 day production lead time, confirmed in writing at order.
