Help? I have been researching a new pump. I have a 24,000 gallon pool,buil in spa-fountain, 4 total 2 inch returns, a heater and a cleaner with booster and a 72 Sta-rite DE filter. Longest pipe run is 106ft, shortest 55ft and the others 70ft, replacing a 2hp Sta-rite... factor 1.1... 1st pump failed after 5 yrs, 2nd pump after two years ( Do I have the correct size pump)... I almost pulled trigger on SP4020 Hayward Northstar- full rated 2hp X 1.20= 2.4, but I found a SP4015 Northstar - max rated 1.50hp x 1.60= 2.4.. are these motors the same thing? What will be the actual difference for me? Thanks, Jeff Seger Texas