Bigger pumps are not always better, and size by itself does not indicate efficiency. The efficiency of the pump largely depends on whether or not the size was chosen correctly for the job.
Bigger pumps consume more power when they run. If the pump is too big for the job, users end up losing more money when they run their system. Sometimes smaller pipes are more efficient because they are designed to work better with smaller water loads. Individuals should plan for the size of the job and should purchase a pump that can provide them with the best results.