Quote Originally Posted by lstinthot View Post
Looks like these two pumps pull the same amps. The WFDS-4 is one HP and the WFDS-26 is 1.5 HP. The -4 costs about $75 more than the -26. Does it make sense they both have the same amp rating? Wouldn't make more sense to go with the 1.5 in my case then for the higher lift?
The WFDS-26 is an up rated pump while the WFDS-4 a full rated pump but other than the label, they are identical in performance. So it doesn't matter which you get. One of the problems with pump ratings is that it causes confusion.


Will these pumps move water on slow speed in my application? I am figuring 50 Ft of head, looks like slow speed graph tops out at 22 lbs.
Yes, they will still move the water on low speed. But head loss is dependent on flow rate so on low speed, head loss is about 1/4th that of high speed. If you indeed have 50' of head on high speed, on low speed you would have 12.5' of head. But you don't need to figure head loss to know that low speed is always around 1/2 the flow rate of high speed.

But because of the lift, you will need to always prime on full speed and then switch to low speed. The pump should not lose prime when shut off but if does, it will need to be started on high speed. If you get a two speed timer, that should solve any priming issues because you can always start the pump on high speed and then switch to low speed.