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Answering Your Water Pump Questions

with RPS Engineer Mike

What are the standard HP sizes for pumps?

The standard HP sizes for water pumps are 1/2HP, 3/4HP, 1HP, 1.5HP,  2HP, 3HP and 5 HP.


What is HP (Horsepower) in Pumps?

Horsepower (HP) is a unit of power used to measure the rate at which work is done.In the context of pumps, HP refers to the power required to move a certain volume of water against a particular total dynamic head (can also be referred to as pressure) within a specified time frame. The higher the rating of horsepower, the greater power available to move water from deeper wells.


Factors Influencing HP Size Selection:

If you’re replacing an older pump, take a look at your old well paperwork for which HP of pump was installed. If you don’t know what HP of pump you need there are a couple factors to consider when choosing…

  • Flow Rate Requirements: Make a water budget, add up all the appliances and spigots that would be running at the same time under a “worst case scenario”. Higher flow rate water budgets necessitate higher HP pumps. 
  • Depth of Well: expect to use a higher HP pump for deeper wells. For example, a 800 to 1000 ft deep well will need a 5HP well pump. A 50 foot well only requires the use of a 1/2HP to 3/4HP well pump. 
  • System Efficiency: Select a pump with optimal energy usage and cost-effectiveness in mind. There’s no reason to oversize a well pump when you don’t need to, the motor will use more electricity and ultimately run up a higher bill.  

Choosing the Right HP Size:

Selecting the appropriate HP size for a pump often requires consultation with a pump engineer - RPS technicians help rural well owners everyday to plan out a water well system for residential and agricultural applications. Give us a call 855-560-5670. 


Larger HP Pumps

Higher HP sizes that you’ll find for larger farms and high volume irrigation include 7.5HP, 10HP, 15HP and 20HP.  

Previous article Is 0.5 HP water pump enough for home?
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Learn More About Water Pumps

  • Is 0.5 HP water pump enough for home?

    A 0.5HP water pump can be enough for a home, depending on how deep the well is and the required flow rate. Most likely a 0.5HP water pump would work for a home some combination of the following; a smaller...

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  • 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, and is able to accommodate wells up to 300-400 feet deep. 1HP really only refers to the type of motor...

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