Floor plan of a single-family house with basement

Addendum to the lifting system: We had an external heating engineer here yesterday, who was the only one to bring it up on his own. I hope we get a good offer so that at least the trade can be done elsewhere...

We have a sump where the washing machine, shower, sink, and drainage channel outside the door drain into, and where a rather simple pump (or two) pumps everything up from a certain fill level. And additionally another macerator for the big business...

In my opinion, the sump should definitely be planned, as it also offers some security in case of an emergency (pipe break, flooding, etc.).

According to our plumber, you should never use such a macerator for continuous operation - it should always be just an emergency toilet and not something you use several times a day. Otherwise, malfunctions would be inevitable over the years...