Hallo to the sifus,

I have question to ask - if my Grundfos pump running causes the water to turn hot (not just shower water, but tap water also become hot) - what does that mean? is it pump got problem need to replace?

(i know it's the pump because when i switch off the pump from the main switchboard, the water becomes cool)

If want to replace, the CM3-5PM1 pump can be installed on the roof (open air) or not?