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Just to say thank you (and if I ever redo the system I will definitely think about a low loss header!). Pump working fine and Grundfos technical support confirmed you do rotate the pump head when pumping downwards.

Over the weekend I redid all the piping under my house to insulate it, make the runs simpler and install a drainage point. In short to bring it up to code. I have also installed a new pump as the old pump that was installed was undersized and could not run the central heating with the underfloor...