I have a single speed Hayward Superpump (1HP 1.1SF). I'd like to replace it with a dual or variable speed unit. It seems I have two general paths: Full pump replacement or dry end exchange. It seems that the dry end exchange would be a very simple process. Full pump replacement though, would allow me to plumb some unions and remove the 2" to 1.5" adaptors at the inlet and outlet.
Dry end exchange models:
A. O. Smith B975T (1.4 THP dual speed)
A. O. Smith ECM16CU (1.65 THP variable)
A. O. Smith ECM27CU (2.7 THP variable /w integrated aux control for booster pump)
Full pump replacement models:
Hayward Max-Flo VS SP2300VSP/SP2302VSP (upgrade to 2" piping connections)
Hayward Super Pump VS Variable Speed Pump SP2600VSP/SP2602VSP (have a spare wet end, still 1.5")
The B975T and ECM16CU are almost half the price of the ECM27CU or the full pump replacements. I'm leaning toward the ECM16CU, but could be persuaded something else, listed here or not.
[EDIT: If anyone is interested.... Pool has two returns, one skimmer, a single main drain, and a booster pump for a polaris]