This is the first year I've been able to use my pool heater in the fall
because I got a heater earlier this year (266k BTU Rakpak Nat Gas) capable
of heating the pool in a reasonable amount of time. I plan to use it into
December if the weather holds out.

The pool is an outdoor, in-ground, 10.5k gal pool. I'm in Central Tx.

I've been kicking the heater on about 5pm to go swimming about 8-9pm. I keep
it anywhere between 83 - 87F.

Is it best to leave the heater on all the time or shut it down until I want
to go swimming like I have been?

Jim