I have an older pool with 1.5" copper plumbing. Due to this constraint, we have kept a 3/4 hp Hayward pump (cant find the model number) which is probably 5 or 6 years old now. We have a spa (used infrequently) but no solar or other water features. Will we see an adequated reduction in out electricity bill if we install a Pentair Intelliflo given that we are not starting with a large hp pump to begin with? My solar installer is trying to convince us we will see significant savings, but I am trying to put some reason behind this given the up front cost of the pumps. I live in the L.A. area with high DWP rates.