Toilet front mounting element before 1m knee wall on underfloor heating?

Hi guys,

I want to modernize my bathroom in the attic a bit, and in the process also get rid of the old toilet with the cistern. Preferably a concealed cistern system.

Problem: The knee wall (visible in the picture) is only 1m high. Additionally, there is underfloor heating in the screed.

Question: With these conditions, can I even create a stable wall system so that a wall-hung toilet is possible? Or should I go for the low-risk option and stick with a floor-standing toilet (the bathroom is less for me and mostly for holiday guests)?

Geberit offers a concealed cistern system with heights of 82cm or 98cm. Would it even be possible to anchor the 98cm unit just below the knee wall edge? Or will it break off, leaving at most the 82cm unit as an option?

Next problem: floor mounting because of underfloor heating. So I can’t simply drill into it. I’m planning to remove the tiles anyway.

Is it sufficient to fix the feet with construction adhesive on the screed (or on the leveling compound that I will probably have to apply afterwards because the tiles are bedded in thick mortar) to have floor contact? In drywall construction, I have once glued floor profiles only because of underfloor heating. That holds like crazy. But those were profiles, not just two supports.

Plus possibly two brackets to fix to the rear wall at floor level.

Or would I have to chisel out the screed, hopefully not hitting the underfloor heating, and concrete the feet in?

Thanks for your opinion and best regards

I don't see a problem downwards. The VWE must have support at the back so that it doesn't tip forward under load. So check the wall to see if there are beams or stones that can absorb the tensile forces.

So the wall behind it is definitely brick. It is not hollow behind the cistern. Should that be sufficient? Possibly also support the feet additionally on the back wall? There are special additional brackets for that, such as: [IMG width="292px"]https://cdn.hornbach.de/data/shop/D04/001/780/491/936/931/DV_8_10368934_01_4c_DE_20201212234658.jpg[/IMG]

Heavy-duty anchors for the wall and your angles are certainly not wrong either, as this way you also get contact with the wall. With dowels or anchors, you usually get a feeling whether it will hold or not.

maybe generously open the wall behind the toilet and attach everything to the rafters that surely run there. This way you can also gain space because you don't come in front of the existing knee wall but come out at the same level? If you can skillfully handle a jigsaw and visually separate the toilet back wall (with new tiles), you don't have to retile completely, only the corresponding area.

Heavy-duty anchors for the wall

You mean something like this? Just heavy-duty plugs?
[IMG width="256px"]https://media.bahag.cloud/m/231526/12.webp[/IMG]