Are the Pearl THOR15 and THOR 15F16S the same pump?

Yes. Both names point to the same 1.5 HP, 115/230V, 1-1/2" NPT cast iron self-priming centrifugal pump. Buy the cheaper listing.

Which is better for lawn sprinklers?

Either one. Both deliver 1.5 HP at up to 118 ft of head, which suits most residential irrigation zones. Match the pump curve to your zone flow and pressure.

How much flow will it give at 40 psi?

The THOR15 listing puts the best range at 40-60 GPM at 35-40 psi. Above that pressure, flow drops toward the 118 ft shutoff head.

Can it pull water from a shallow well?

Yes, up to 25 ft of suction lift. Keep the suction line short and airtight, since self-priming pumps lose prime with air leaks.

Is one worth extra money?

No. They are the same model, so paying more buys nothing but the listing. Take the lower delivered price.

Does it run on 115V or 230V?

Both. It is dual voltage and can be wired either way; the THOR15 listing rates it at 21 A on 115V and 10.5 A on 230V.

Pearl Thor15 Centrifugal Irrigation Pump - 1.5 HP - 115 / 230V vs Pearl THOR 15F16S Centrifugal Sprinkler Pump (1.5 HP, Single Phase, 115/230V)

These are the same pump: the Pearl THOR15 (THOR-15F16S) and the Pearl THOR 15F16S are one model listed under two names, both 1.5 HP, 115/230V, 1-1/2" NPT, 118 ft max head, cast iron, continuous duty. Buy whichever listing is cheaper and in stock; there is no performance difference to weigh. Compare the delivered price at each store, since the pump itself is identical.

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