Zean
Can we reduce the pump pressure for the Grundfos pump? I cant remember which model I have, but it is the one without the tank...

Actually, same here too, I m using Grundfos PC model, and it is causing my pipes to hammer. I m still looking for ways to mitigate it, as i don't want to have leaking pipes later.
The only problem in my situation is that my pump is very difficult to reach, there is no manhole to reach it, and the only way is to go via the roof. Since the tank needs refilling every year, I've decided to go for a maintenance free pump, the PC model but unfortunately comes with hammering consequences.
Anyone have any ideas on how to help on the hammering effect?