Can someone confirm for me please that the Grundfos Booster pump
mentioned here should be in a 'push' configuration rather than 'pull'.

Pumps fundamentally prefer to push. You would have to go out of your way to
design a pump that prefered otherwise.

One problem with pulling is that you only have 1 bar of pressure before you
get a vacuum. Use much of this pressure loss through pipe losses and you
will get cavitation and other nasties. 1 bar doesn't pull much water if
there is much restriction, such as long lengths of pipework or elbows.

No pump after the restriction can overcome this issue. However, if a pump is
before the restriction instead, the only pressure restriction is that of the
pipework rating. Therefore, you can push with up to 6 bar pressure, which
can lead to a much higher potential flowrate.

Christian.