A "Full rate" motor has a fairly large Service Factor. Typically, about 1.3 to 1.99. An "Uprated" or "Max rated" motor has a smaller Service Factor. Usually 1.0 to 1.3.
The only thing that matters is the Total HP of the motor, which is the rated HP x Service Factor.
A 1 hp full rated motor with a 1.65 sf is the same as a 1.5 hp max rated motor with a 1.1 sf.
It's all kind of ridiculous because they sell two identical pumps as if they were different.
Thank you James. Is "Max Rate" used in these motors' descriptions the same thing as "full rate"? In that case, the SPX3205Z1MR would give me the same flow (too much) that I've had, but the SPX3207Z1MR would probably be just fine, right?
I'm also slightly confused by your motor and impeller matches/recommendations--the first match seems to be 3/4hp and 1/2hp respectively, but the second is 1hp and 3/4hp, but then you did say I could use either impeller with the second motor... Would all 3 of these combinations decrease my preset flow, just less significantly? If so, in which order?
And returning to your other idea of replumbing to use the main pump for the waterfall, what would I do with the existing line that brings water from the pool to the old pump for the waterfall (which uses separate intake drains in pool)?
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