Replacement pump

[anotherpyr]

My old Hayward SP-1607 1hp pump may be failing. It seems to be running hot these days and even shuts off due to heat.

Given that I have a 16x32 inground pool (~20,000 gallons) with a Hayward EC65 DE filter, what would be a good replacement that would be cheaper to run? Would a dual speed get the job done for less? According to Hayward the design flow rate for the filter is 54 gpm.

The pool is plumbed with 1 1/2" lines. 2 skimmers and a bottom drain with 2 returns.

It looks like a max-flow pump, but obviously the design has changed since it was installed in 1990.