Waterproof windows - Already passed the baptism by fire?

Hello dear people!

I would like to install relatively large basement windows where the drainage of the light well is problematic. The alternative to sewer construction and a pump are waterproof windows. So far, I have come across only 4 manufacturers, of which only one offers sizes that go significantly beyond portholes. However, an independent test certificate is only available for the size of 1 m² from this company as well. Nevertheless, they also sell larger two-leaf formats that have only undergone an "internal inspection."

The most recent posts on this topic here in the forum are more than 10 years old; since then, there has been a lot of flooding and living space has generally become scarcer. Therefore, I assume that the desire for larger but waterproof windows has at least increased sharply among builders in recent months.

Who has EXPERIENCE with waterproof windows? I do not want to do covert advertising, but maybe you even have very concrete EXPERIENCE with the manufacturer L***Hammer?

Thank you for sharing your experience!

You could ask the basement manufacturer, who advertises with his waterproof basements, which windows he uses.

From my point of view - and I have certainly expressed this more than once - you are making a fundamental mistake: I don’t recall any thread about your entire construction project, only dozens of individual questions. A whole made up of many uncoordinated assembled parts will certainly not become one thing: waterproof.