Warm floor
A warm floor can be a hot line. It can also be a leak.
People feel a warm patch and jump to slab leak. Recirc lines, in-floor heat, and some electrical loads also make heat. Context first, demolition later.
Note whether the heat is actually off.
In-floor systems can run on a schedule you forgot.
Note whether the patch is also wet or musty.
Heat plus moisture is a stronger leak signal than heat alone.
Do not open the slab from a phone photo.
Investigation should narrow the run with the least-disruptive methods first.
Questions people ask
Is a warm floor always a leak?
No. Hot piping and heating systems create heat on purpose.
Can thermal imaging map it?
It can show a pattern. It still needs building context before anyone cuts.