Affordable sanitary installations from the internet - problems with the plumber?

Yes, that’s true, and it is about the warranty of the material. Often, these sanitary articles are also available from the wholesaler in an online shop. Why should the installer accept the material through this channel? I can understand that.

We need to renovate the sanitary facilities of my parents-in-law. For this, I have obtained quotes from three companies. Now it is also about the question of the material. All three companies are tied to a sanitary wholesaler. Here, I can only review the entire quotes and then decide.