Response to Hi Chin, The B2841 is a 1 HP full rated motor which has a total hp of 1.65 and a frame size of 56Y, the UQC1102 is a 1 HP up rated energy efficient motor which has a total hp of 1.25 and a frame size of 48Y. If you currently have the B2841 you would need to change the impeller of the pump and use the motor pad to support the smaller frame size if you want to use the UQC1102. You would also need to make sure that downsizing the motor would not be a problem. 

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