Swedish Element House / AB-Elementhus Renovation vs Demolition

I renovated my entire Landskrona in 2019/20. The house is now 40 years old. In the attic, the entire shower was rebuilt, and the single-pipe heating system was converted to a two-pipe system. On the ground floor, I still have a single-pipe system except for the bathroom, because I installed underfloor heating there, and that only works with a two-pipe system. All radiators were replaced, and the entire wooden cladding on the exterior facade was renewed. The masonry consists of real clinker bricks, and they are all still in good condition. Best regards to Bonn.

Thank you for the response! I was just really happy :)

How did you handle the [Muffen]? Are they screwed on? Were you able to install different pipes when you made the changes in the bathroom on the ground floor?

I'm afraid we won't be able to put the single-pipe system back together if I remove the radiators in the bathroom.

The joints have simple slotted screws

I would consider removing all the old pipes. I don't want any of the gunk that came out during our dismantling to be in any new system.

Are these galvanized steel pipes? I am not familiar with these connections with the coupling. I have copper pipes everywhere and I have press-fitted all the connections.

Pictures of the renovation