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Answering Your Water Pump Questions

with RPS Engineer Mike

What size pump do I need to lift water 20 feet?

You won’t need a very powerful water pump to lift 20 feet. If you’re pumping out of a well, I would say a 1/2 HP or 3/4HP submersible pump will easily be up to the task. 

 

The next question you’d need to ask yourself is… how many gallons per minute of water do you need? 


A submersible pump for a household would typically require at least 10-15 gallons per minute. In that case I would recommend something like a 07RPS05 1/2HP or a 07RPS07 3/4HP. If you wanted a higher flow rate, around 25GPM, then I’d recommend a 25RPS05 1/2HP.  


And then the next question after that is, do you plan on using a pressure tank? 


A 40-60psi pressure tank will INCREASE the workload of a pump by 92 to 140 feet. Here’s the math of translating PSI into feet of head…


1PSI = 2.31 feet of head 

40 PSI = 92 feet of head 

50 PSI= 115 feet of head 

60 PSI = 140 feet of head  


In that case, here’s the math for a 20 foot lift with a 40PSI pressure tank…


20 feet of lift + 140 feet from a 60 PSI pressure tank = 160 feet total head 


In the case of a well for a residence that needs to pump at least 10-15 gallons per minute and handle at least 160 feet of head, I’d still recommend around a 3/4HP to 1HP, like a 07RPS07 or a 07RPS10. Just like before, if you wanted around 25GPM flow rate, then a 25RPS10 1HP or 25RPS15 1.5HP would be the right fit.    


As an alternative, a surface booster pump can easily pump 20 feet of lift. Any of the booster pumps from the RPS Eco-Steady Booster Pump Range will pump up to storage tanks, to homes, or transfer water. 

Previous article What size of pump do I need to lift water 30 feet?
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