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Where should condensate water come from? The pipe is not significantly warmer or colder than inside the house.

Of course it is colder! The pipe comes from or goes outside

The pipes are sound insulated. Since they are located in a warm area, there is no condensation.

The pipes are sound insulated. Since they are located in the warm area, there is no condensation.

Now you're a plumber too. That's how a plumber explained it to me. It's not like I'm making this up out of thin air as a process manager.

I am an engineer and there is nothing difficult about that! It’s simply logical, don’t you think?

I am an engineer and there's nothing easier than that! It's just logical, don't you think?

I think we're both right, after I did a bit of research. So to the others: Just make sure to have your pipes insulated.

No, it is not. At least for us, the cold water is significantly colder than room temperature, especially in winter. The cold side of the tap, for example, is often fogged up when bathing. So why shouldn't this be able to occur with the drain pipe?