Wall-hung toilet: how the frame and concealed cistern work

What a wall-hung toilet is

A wall-hung toilet, also sold as a hanging toilet, wall mounted toilet or concealed toilet, has no foot on the floor. Geberit’s overview of WC designs describes the pan as fixed to the wall through a pre-wall frame that also holds the cistern; from the room you see only the pan, the seat and the flush plate.

That changes where the weight goes. Geberit’s North American site states that the in-wall frame and the toilet carry up to 400 kg together, and it notes that the free floor under the pan makes cleaning simpler.

What sits inside the wall

A wall-hung pan is only the visible part of a system. Before buying, check the frame and cistern as carefully as the ceramic. The figures below come from two frame makers’ product pages and are examples, not a standard for every brand.

What sits inside the wall

Part	What it does	Example figure
Steel frame (element)	carries the pan and the cistern	112 cm high, 42.5 cm wide
Lower frame	for a wall that is not full height	0.82 m installation height
Concealed cistern	stores and releases the flush	factory set 5.8 / 3 litres; large flush adjustable 4–7.5 litres
Pan connection	joins the pan to the waste pipe	ø 90 mm, adaptor for ø 90/110 mm
Pan height	set when the pan is hung	41–46 cm
Flush plate	flush buttons and service opening	access to the cistern without tools

Grohe sells its Rapid SL 3-in-1 set as frame, flush plate and wall brackets together, with a 6–9 litre cistern. Sets like this show why the box contents matter: a pan sold alone still needs every part in the table.

Wall mounted toilet or floor-standing

The drain is the first difference. Parryware, part of Roca Bathroom Products, explains in its guide to P-traps and S-traps that wall-hung toilets use a P-trap, a horizontal outlet into a drain in the wall. A bathroom whose waste pipe comes out of the floor needs that pipe rerouted into the wall before a hanging pan can go in.

The wall is the second. Geberit’s page on its installation systems lists versions for drywall, solid construction and prefabricated walls, and a telescopic frame that adjusts to room height without cutting. Once the wall is tiled, the cistern is reached through the opening behind the flush plate; Geberit states that its spare parts stay available for 50 years. For an existing bathroom where opening the wall is not an option, Geberit’s own guide points to exposed cisterns as quicker to fit.

What to check before you buy

1. Drain position. A wall outlet suits a concealed toilet; a floor outlet needs pipework first.
2. Wall type. Masonry, stud wall or a new prewall decides which frame you need.
3. Frame height. Frames come in set heights, such as 112 cm from Geberit or 1.13 m and 0.82 m from Grohe; measure the wall you have.
4. Pan height. Agree it before the pan is hung; on the Geberit element above the range is 41–46 cm.
5. Pipe size. Check that the pan connection matches your ø 90 or ø 110 mm waste pipe.
6. Box contents. Pan only, pan with seat, or a full set with cistern, frame and flush plate.

The JOMOO pan Kitovu stocks

One hanging pan is on the shelf in Zanzibar: the JOMOO Wall-Hung Toilet 02355-00-2. Its listed size is 565 × 375 × 350 mm, it is white and it has a seat with cover. The product image shows it next to a concealed cistern and a 246 × 164 mm flush plate, but the box contents are not confirmed yet: ask on WhatsApp whether cistern and frame are included before the wall is built.

For other toilet types and how traps and flush volumes compare, see our page on toilets. For the maker itself, see JOMOO.