Thanks. The thing w/ 2-speed is that I have a solar heating system with panels on the 2nd story roof, so I wasn't going to attempt trying to figure that out at this time. My current pump is SP3010X15AZ (or at least that's what I figure the replacement needs to be - my label is totally worn out). All I really have is the label on the motor, which is 1.5 HP, SF 1.