Just FYI. I verified that the pump in the IntelliFlo and the IntelliFlo 4x160 are identical with identical curves and efficiencies. The only difference in the full version is the addition of a flow meter plus associated electronics to keep track of total volume so that the pump can shut off after a designated number of turnovers. That is what leads to much greater savings for certain configurations where multiple features are present (needing different flow rates) or where the system curve changes (e.g. filter gets dirty).

Richard