Well Pump Size

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Plumber111

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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.
 

Tom Sawyer

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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.
 

Plumber111

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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.

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.
 

Hackney plumbing

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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.
 

Plumber111

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My rule of thumb is 5 GPM per bathroom. That number can easily change if you have showers with multiple heads or irrigation demands.

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?
 

Valveman

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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.
 

Tom Sawyer

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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.
 

Plumber111

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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.
 

Tom Sawyer

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I would suspect that if you were to ask Goulds or Grundfos that 1/2hp or 3/4hp. 10gpm are probably their biggest sellers.
 
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