How many watts does a 1 hp pump use?

Today’s question is, “How many watts does a one horsepower pump use?” When we look at straight horsepower of a one horsepower pump, we’d be looking at 750 watts of power. But a majority of pumps use what’s called a Service Factor.

Now the service factor is a multiplication of the 750 and it’s actually higher power. For a one horsepower pump, a very common service factor is around 1.4 to 1.5. So that means we’re looking at around 1100 watts of usage for a one horsepower pump.