Response to Hi, JJ. A 1.5HP full rate motor has a total hp of 2.25 so technically you already using a 2hp motor. You will have to upgrade to a 2hp full rate motor ST1202 which will have a total hp of 2.6. You will have to replace the impeller along with the necessary parts to make the conversion depending on the pump model. If you're replacing a 1.5hp  full rate motor to a 2hp up rate motor - UST1202, you do not have to replace the impeller, diffuser etc. just the pump seals.

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