4HS 4” bore pumps are a ready to use constant pressure unit that comes with a pump, inverter and a surface mounted controller. The pump is made from 304 stainless steel including the impellers (no plastic impellers here!).
This unit is designed to give constant pressure at the surface regardless of water demand so if the demand is small or large the pressure will be the same (provided of course that it is within the pump capabilities).
The inverter is part of the pump which avoids the use of expensive filters and shielded cables and reduces electromagnetic emissions to a minimum.