Heating defective due to ammonia from the channel

I would immediately call in an expert for 360. Unfortunately, I can't find any. I had a very detailed conversation with one from around here, and he quoted exactly these 3600 euros net. If someone can recommend a good and affordable one in the Oberfranken area, I would be very grateful. TÜV and DEKRA unfortunately do not do this. I have not yet inquired at the Chamber of Crafts.

Inquire at the [IHK] about a publicly appointed and sworn expert

So I understand this correctly: The heater sucked in pee and destroyed itself in the process? And now you are supposed to be to blame for that? That can't possibly have been planned, no one fills any siphons.

That can't possibly be planned that way, no one fills any siphons.

I understood that modern systems can fill the siphons independently. Is that correct?