Pump Efficiency

[mas985]

My understanding of the Intelliflo and the 4x160 is that the Intelliflo allows you to adjust either flow rates or speed (RPM) vs the 4x160 which only allows you to adjust the speed.

The avantage of the flow rate adjustment is that it is independent of head loss so when you turn on the solar or other any other valve changes, even though the head loss changes, the pump will automatically adjust the RPM such that the flow rate remains constant. This allows for a constant turnover rate and thus a constant run time. This is primarily the reason for the difference in energy savings. For the 4x160, you must set the RPMs for the worst case such that some of the time you will be running the pump longer than necessary.

Although the Intelliflo has not been around long enough to determine reliability, if you can afford it, it definitly has some advantages.