Using the sample system curves, the flow at 2,730 rpm is estimated to be between about 63 gpm and 93 gpm.I have the pump set to run at 2700 rpm for 4 hours, then 1700 for 20 hours. Seems to be ok so far, is that a reasonable schedule?
Since the heater only needs 35 gpm, the pump speed is excessive and just wastes energy.
Assuming the system curve is not horrible, the speed should not need to exceed about 1,725 to 1,925 rpm even with the heater on.