Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Grundfos Magna - which mode?

Matt_67 Member Posts: 287
I just installed a grundfos magna on a cast iron radiator system with TRV's and outdoor reset.  I am just curious what mode others have used in in this situation and with what results.  The other times I've used the magna were on apartment buildings with zone valves - I left it in the auto-adapt mode and it worked fine.


  • CMadatMe
    CMadatMe Member Posts: 3,086

    Model? The modes are clearly spelled out in the manual dependent on system type and head requirements. For instance a 65-120 would be run in the proportional mode if the head is higher then 13'..

    There was an error rendering this rich post.

  • Matt_67
    Matt_67 Member Posts: 287
    grundfos 40-120

    It is a 40-120.  The system has some long marginally sized pipe runs to the furthest radiators.  I left the pump in the proportional pressure mode as per the manual.  I guess I'm just trying to understand why that would be better in my situation.  Constant pressure makes more sense to me.
This discussion has been closed.