Well Pump Size

Discussion in 'Pumps and Tanks Well Forum & Blog' started by Plumber111, Feb 26, 2012.

  1. Plumber111

    Plumber111 In the Trades

    Messages:
    76
    Location:
    North Carolina
    I haven't read all of the posts where pump size is discussed obviously, so it's easier to ask rather than read them all:

    What's they typical well pump size you see or install for your area?


    Thanks.
  2. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,311
    Location:
    Maine
    The pump gets sized to the delivery of the well and the expected demand. There is no typical pump size. That's why pump manufacturers make a bunch of them.
  3. Plumber111

    Plumber111 In the Trades

    Messages:
    76
    Location:
    North Carolina
    I do understand that. However, there is a reasonable standard that I would think you would be seeing for your area. I can tell you right now what is "typical" for a residential here.
  4. valveman

    valveman Moderator Staff Member

    Messages:
    4,586
    Location:
    Lubbock, Texas
    My rule of thumb is 5 GPM per bathroom. That number can easily change if you have showers with multiple heads or irrigation demands.
  5. Hackney plumbing

    Hackney plumbing Homeowner

    Messages:
    1,174
    Location:
    Alabama
    I dont work on wells but somtimes I turn the power off to well pumps. usually on a 40 or 50 amp breaker if that means anything to those that service them. Pumps are usually within 50' of the breaker panel.
  6. Plumber111

    Plumber111 In the Trades

    Messages:
    76
    Location:
    North Carolina
    Thanks. I know that well production, column/static, depth, etc. is needed to customize and get the best efficiency.

    But what HP & GPM pump does that typically translate into for anyone reading's area?
  7. valveman

    valveman Moderator Staff Member

    Messages:
    4,586
    Location:
    Lubbock, Texas
    For a 100' deep well that would be a 3/4HP. For an 800' deep well it might be 5HP. Accross the country wells can vary that much in depth, which is why they make so many different size pumps. But I would say the average is a 3/4HP, 10 GPM or a 1HP, 15 GPM.
  8. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,311
    Location:
    Maine
    OK, I guess if you held my feet to the fire and made me consult my sales data base we probably put more 1/2hp 7gpm pumps in, in this area around my office than anything else but again, I don't have to go too far north or west and then we can get into much greater well depths, sometimes as much as 800' or so.
  9. Plumber111

    Plumber111 In the Trades

    Messages:
    76
    Location:
    North Carolina
    Here we see in the majority 1/2HP-3/4HP around 10GPM with the curve lowering as static drops. A 1HP now and again. I don't remember ever seeing anything above that on residential. Almost zero irrigation here though.
  10. Tom Sawyer

    Tom Sawyer In the Trades

    Messages:
    3,311
    Location:
    Maine
    I would suspect that if you were to ask Goulds or Grundfos that 1/2hp or 3/4hp. 10gpm are probably their biggest sellers.
  11. valveman

    valveman Moderator Staff Member

    Messages:
    4,586
    Location:
    Lubbock, Texas
    In our area a 1.5HP, 20 GPM is the most common, and everyone has an irrigated yard, garden, or both.
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