if you're thinking about a g4 switchable i would say use 3 phase if u are pumping high. If you are just doing houses and normal stuff the machine will be ok in 230v mode.
Using parex monorex as example in single phase mode you could pump about 20 mts away from the machine ( 10 mts vertical) in 3 phase mode around 50 mts (20 mts vertical)
hope this helps.
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