What is the most common well pump size?

The most common well pump size is a 1HP, 4” diameter submersible pump. A 1HP water pump is pretty versatile,  as discussed in more detail at what size pump for 300 foot well, is able to accommodate wells up to 300-400 feet deep. 1HP really only refers to the type of motor end on a well pump. There are a variety of submersible well pump ends, which determine the well depth possible and flow rate. Pump ends utilize centrifuges that spin and accelerate water to the top of a well. The more centrifuges stacked inside the pump end results in greater head ability to pump out of deeper wells.

 

If you’re unsure which horsepower you need, check out this helpful breakdown of standard water pump sizes and what each is best suited for.

 

1HP well pumps are used for residential, livestock, irrigation, filling ponds, and industry applications. A number of fountain pumps also fall into the range of a 1HP. For increased water pressure, consider a booster pump. 

 

If you're outfitting a home water system, consider choosing a reliable residential well pump that offers long-term performance and easy maintenance for households of all sizes. For deeper wells, deep well pumps are an excellent choice.

The most common flow rate for a 1HP well pump is 25 gallons per minute. Most residences want a flow rate that can keep up with appliances with a bit left over for lawn or property irrigation. As long as your well produces 25 gallons per minute and the refresh rate can keep up with the pumping rate, 25GPM is a great choice for any single or multi family home. Check out the 25RPS10 for a 1HP 25GPM water pump.

Lots of well owners like to upgrade to a 1HP well pump instead of using a 3/4HP. The upside is that 1HP is a more powerful pump, both in depth ability and flow rate, for not much more money. If you're unsure of the best option for your needs, try using well pump size calculator.

Here are some examples of 1HP well pumps…

1HP Well Pump Models	Flow Rate
05RPS10	4-8GPM
07RPS10	5-13GPM
10RPS10	9-18GPM
18RPS10	22-29GPM
25RPS10	21-31GPM

The most common well diameters are 4” and 6”. And the most common diameter of a well pump is 4”. A 4” submersible well pump, actual diameter 3.85”, is made to fit into a 4” well. You can also use a 4” well pump in a 6” well. Don't forget to pair your pump with a reliable well pump pressure switch for optimal performance.