The WFE-2 is a little better at 1200 watts. The Whisperflo series are very large pumps. The WFE-2 has the same power/flow of some full rated 3/4 HP and 1 HP uprated pumps which is what you had. Downsizing a pump based solely on label HP alone may not always give you better energy performance. This is the primary reason I suggested going with a two speed pump in the Superflo series.