ᐅ Pipe burst or something else? Any ideas or suggestions?

Dear experts,

I registered here to ask a question and hope to get an answer.

We moved into a new apartment three weeks ago. We knew the previous tenants very well. A few days ago, we noticed a continuous dark streak along a wall downstairs that runs through several rooms. This streak was not there during the previous tenants’ occupancy or when we moved in.

Could this possibly be a pipe leak? In my opinion, a leak would typically affect only one spot, but this streak runs along the entire wall. I am at a loss.

What can you say about it at first glance?

I look forward to your answers.

Kind regards

Horizontal, at this height? - that would only fit together with heating pipes, if at all.

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Report immediately to the landlord!

What have you installed?

There is water on the floor, already rising up the wall. I would be surprised if the damage isn’t even worse for some of you.
Report it to your landlord immediately and possibly shut off the water until the cause is found.

It looks like there is a defect in the underfloor heating system.