Oversized submersible pump

Discussion in 'Pumps and Tanks Well Forum & Blog. Water is life.' started by ruteger, May 24, 2019.

  1. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    I am looking to replace my water pump at my cottage. Water is drawn from the lake and pumped up the hill to the cottage. We currently have a jet pump that didn't get winterized in time, froze and cracked.
    I want to replace it with a submersible pump.
    Based on my research, I think I need 8 gpm.
    One regular bathroom, kitchen sink, outdoor shower, washing machine, outdoor tap. Going to add a dishwasher eventually. Family of six, guest there at times.
    Rise from the bottom of the lake where the pump will be to the cottage is approximately 60 feet.
    Length of pipe from the pump to the cottage will be approximately 140 feet.
    I have found a deal on a 15 gpm 1 hp submersible pump.
    I feel this is more than I need. 10 gpm 1/2 hp will likely be sufficient?
    But will there be issues with using this oversized pump?
    Maybe i will need a larger pressure tank and all will be fine?
    Think i covered all the relevant info, but let me know if i missed something.
    thank you
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    What is the altitude difference between the lake surface and the cabin?
     
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  4. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    approximately 50 feet
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    That 10 gpm 1/2 HP would be the right size... maybe a little big, but 1/3 HP pumps are rare. Ideally you would have a 44 gallon pressure tank or bigger, but your 32 gallon is acceptable.

    Your 15 gpm 1 hp pump would be oversized for a house.
    [​IMG]T
     
  6. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    Thank you for confirming I should be okay with pump I sized.
    If I did go ahead with the overkill 1 HP 15 GPM, what would the downside be? Would there be any issues?
     
  7. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Short run times. Flow noise in 1 inch pipes. Maybe more.
     
  8. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    A CSV makes a large pump act like a small pump when needed, and you won't need a larger tank.
     
  9. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    Not sure what size tank I have. It’s four hours away. And never thought to check before I came home. What size should I have for 1/2 hp pump? The 1 Hp?
     
  10. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    And if I use the tank I have now that is likely okay for the 1/2 HP with the 1 HP what will happen?
     
  11. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Look for the gpm the pump pumps, multiply by 4, and you want a tank at least that big.

    So if your pump pumped 8 gpm, you could use a 32 gallon tank or bigger. For 11 gpm, 44 gallon or bigger. Looking at the table above, your 10 gpm pump will pump about 10 gpm probably.
     
  12. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    With a CSV any tank larger than 4.5 gallon size will do.
     
  13. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    So if I use a tank that’s too small pump will run for too short of time and not get enough cooling? This will shorten life? What’s normal life expectancy and what would be life expectancy with undersized tank? Ballpark
     
  14. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    Where can you get CSV in my area? Ontario Canada
     
  15. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    The pump installers in your area have them and should have already told you about them. Just Google CSV1A and you can have them delivered to your doorstep.
     
  16. ruteger

    ruteger New Member

    Joined:
    May 24, 2019
    Location:
    Burlington, ON, Canada
    Was planning to do this myself with the help of my father. So haven’t talked to any pump installers. Can’t really find anyone that sells them. Was hoping to find someone online that I could buy from in person. But any pump installer should be able to set me up w one?
     
  17. valveman

    valveman Cary Austin Staff Member

    Joined:
    Mar 15, 2006
    Occupation:
    Pump Controls Technician
    Location:
    Lubbock, Texas
    You can order them direct at Cyclestopvalves.com.
     
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