ᐅ Concealed cistern for floor-standing toilet

I live in a detached house from the 1950s. The bathroom has a floor-mounted toilet with a surface-mounted cistern. We are considering replacing the cistern with a concealed one inside a boxed-in wall projection. Our plumber has inspected it and said that this wouldn't be possible with a floor-mounted toilet; it would have to be replaced with a wall-hung toilet. The costs for this are obviously significant. So my question is: Is it really not possible, and if so, why not?

If you search online, you’ll also find concealed installation solutions for floor-mounted toilets. (We had one in our last apartment as well.) The problem in your case will be that your casing extends about 15-20cm (6-8 inches) forward. This means the toilet won’t fit properly onto the drain outlet anymore. So, you will have to make some changes anyway, which will most likely lead you to use a concealed installation system and a wall-hung toilet.

So, if you are already

--replacing the cistern with a concealed solution in a boxed-in pre-wall installation. Our plumbing---

then it makes sense to include a wall-hung toilet in the installation. A room with a floor-mounted toilet is harder to clean and simply no longer state-of-the-art! The additional financial effort is limited, but the frustration over missing the toilet upgrade lasts forever!

In other words: a floor-standing toilet is also an option. “Obvious” and “state of the art” are not exclusion criteria. It really depends on personal preference. We don’t have much frustration with the floor-standing toilet (in other words: none at all), but with a tight budget, replacing the toilet bowl including modifying the entire waste pipe can be significant. This is a single measure here, not part of a major renovation.

You will have to change the drainage either way. Whether it is routed forward towards the toilet or backward behind the boxing-in should not make much difference. Your cost-saving measure would therefore be not replacing the ceramic fixture, which costs around €50. If that is too expensive for you, then why make any changes at all?

Until now, I had the amateur understanding that the outlet of the concealed cistern is simply connected to the toilet waste pipe. There is enough space, and if a few centimeters (inches) of pipe stick out of the casing, it’s not a big deal. If the drainage needs to be changed anyway, it really doesn’t matter much. But I still don’t understand why this has to be the case, and why the toilet can’t just stay as it is.