Many customers have always wondered what the difference is between a full rated and an uprated pump. For this example, we’ll be looking at Pentair’s Whisperflo lineup. There IS a difference and its to the full rated pump’s advantage. When looking at the HP of a pump, it is also important to note the SF or Service Factor. To get the true horsepower, multiply the HP rating and the SF.
As you can see, the full rated pumps operate at a significantly higher power than their uprated counterparts. You won’t be getting as much HP with an uprated pump in comparison to a full rated. In fact, an uprated 2HP Whisperflo actually operates a step down from a full rated 2HP Whisperflo! There are also notable advantages to a higher SF rating. In summation, a full rated pump will always operate more efficiently than an uprated pump. All of our motor/pump stock consists of FULL RATED motors/pumps. We carry only the best for our customers.