When designing a bathroom , you should consider its functionality on the one hand, and aesthetics on the other. A practical concealed toilet frame can help you maintain both of these aspects at a high level. This is a modern toilet mounting system that saves a lot of space and at the same time has a positive effect on the appearance of the room. Learn the most important information about concealed frames!

In this article you will learn:
- how can flush-mounted frames be used,
- which flush-mounted frame to choose,
- how to install a flush-mounted frame.
Concealed frames and their properties
A concealed toilet frame is a supporting structure equipped with a water tank, used to hang a toilet. It allows you to hide all the connection elements in the wall, so that only the toilet bowl and the flush button remain visible. This solution can also be used to mount a urinal, bidet or washbasin.
Check out the built-in frames in the Onninen offer
The use of a concealed frame makes it easier to keep the room clean, because there are no connecting elements on the floor under the toilet. The concealed cistern is also hidden in the wall, which guarantees the optical enlargement of the bathroom. The whole thing looks neat and minimalist, especially in comparison to traditional compact bowls equipped with massive lower cisterns.
The concealed frame is a natural choice for any investor designing a new bathroom or planning a general renovation of an existing one. This solution works best in small interiors - for example in apartment blocks - where every square centimetre of space is worth its weight in gold. It also favours modern and elegant arrangements, the key determinant of which is minimalism.
It is also worth noting that concealed toilet frames have the advantage over traditional toilet bowls that they allow for height adjustment. Both the wall-hung bowl and the flush button can therefore be installed with the individual requirements of users in mind.
How to choose the right flush-mounted frame?
A concealed toilet set is a universal solution that will work in literally every bathroom. There are various types of frames on the market, so it is worth considering which one is best. First of all, consider the following criteria:
Workmanship
Due to the difficult access to the elements mounted in the wall, you should only choose products from renowned brands that guarantee failure-free sets. Otherwise, frequent repairs may be necessary, sometimes requiring chipping tiles, cutting out plaster and dismantling the toilet. So, choose a frame made of high-quality materials, characterized by solid workmanship.
Frame height
As you already know, the height of the frame can usually be adjusted quite freely, but you will come across two types on the market. The most frequently chosen is the high one - around 110-130 cm and allows you to raise the toilet seat without covering the flush button. Additionally, it will not be activated by accident (e.g. if someone leans on the seat). With a low frame, which can be around 80-90 cm, flushing is only possible after lowering the lid. Such a solution will be necessary, for example, when the space for the toilet is under a window.
It is also worth paying attention to the width of the frame. It is usually between 35 and 50 cm. The narrowest is usually used for washbasins, wider for wall-hung toilet bowls.
Possibility to adjust the amount of water in the flush
One of the ecological trends is concealed cisterns, which allow you to choose the amount of water used to clean the toilet. A dual flush system is a solution that allows you to save water on a daily basis.
Tightness of the flush tank
A leaking cistern is a problem that can have serious consequences. If you want to avoid the complicated repairs we mentioned in the first point, it is best to choose a concealed frame with a cistern made of a single element made using the blow molding method. This allows you to avoid welds along the edges of the tank, which could leak.
Kit Contents
When looking for the perfect concealed frame for your project, try to invest in a ready-made set (stabilizing system with a toilet bowl). This guarantees compatibility of the individual elements, which should include mounting brackets, a flush button, wall brackets and a soundproofing mat. However, if you already have a toilet bowl or prefer a different model than those available in sets, you can buy the frame alone.
Check out the built-in frames in the Onninen offer
Warranty period
As with other products, it is worth considering the warranty period of the frame. Before buying, also look into the availability of spare parts.
How to install a concealed toilet frame?
In terms of installation, the frames available on the market can be divided into two categories. The choice between them should depend on the type of wall in which the set will be placed:
- Heavy-duty (wet) toilet frame - designed for installation directly in a brick wall. It must be bricked and plastered, so its installation is very laborious.
- Toilet frame for lightweight (dry) construction - the most popular solution and intended for installation in plasterboard construction and in walls made of lightweight concrete blocks.
Regardless of your choice, you don't have to worry about the frame's resistance. During use, it can withstand a load of up to 400 kg. It's a completely safe construction.
Before installation, it is worth taking measurements of the bathroom and reserving the appropriate amount of space. The concealed frame will take up 40-50 cm of width, 15-20 cm of depth and about 120 cm of height.
Since one of the key advantages of flush-mounted frames is their aesthetic appearance, special attention should be paid to the final visual effect of the assembly during their installation. While heavy construction does not leave you with too much room to maneuver, in the case of lightweight construction you have three different solutions to choose from.
The first involves installing the frame flush with the wall. This method will be used primarily in larger bathrooms, where the space above the toilet can be sacrificed without feeling like you're wasting valuable space. The wall is then completely even, and the only protruding elements are the toilet bowl and the flush button.
The second solution is to create a structure characteristic of a chimney. This means using waterproof plasterboards (18 mm thick or two 9 mm thick) to create a structure the width of the frame and the height of the entire bathroom. An interesting practice is to hide LED strips behind the edges of such a structure, which allows for attractive illumination of ceramic tiles.
The third method involves building up the entire width of the wall with plasterboard to the height of the frame. This creates a shelf about 20 cm deep. It can be used for cosmetics or decorations.
You will find the right concealed kit at the Onninen wholesaler!
If you are wondering which concealed toilet frame to choose, be sure to check out the wide range of our online wholesale offer. The sets available at Onninen will serve you both for the installation of a toilet and a urinal:
- Geberit Duofix concealed mounting frame for WC – equipped with a concealed cistern, activated from the front or from the top, which allows installation and service work to be carried out without the use of tools.
- Grohe Rapid SL Fresh concealed frame for WC - 5-in-1 set, equipped with chrome Skate Cosmopolitan button, installation system, conversion kit, sound-proofing mat and wall angles.
- Mounting element - Geberit Duofix concealed urinal frame for urinals
Concealed frame Concealed frame for urinal with top inletRoca for urinal - designed for sanitary facilities with top inlet, works great in small bathrooms.- Onnline concealed frame for WC - concealed frame including brackets, intended for dry construction.
At your disposal in the Onninen wholesaler are also high-quality washbasin frames: Geberit Duofix Basic concealed washbasin frame or Roca concealed washbasin frame . So choose the products necessary for the implementation of your project and create a bathroom that perfectly combines aesthetics with functionality!