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Deep well pumping capacity - Water Ace Co. Well Pump Capacities in GPM or Water Delivery Rates
Pump capacity charts & calculations for jet pumps & submersible pumps

  • WATER PUMP CAPACITIES TYPES RATES GPM - CONTENTS: water pumping capacity of different types of water well pumps: Single Line Jet Pumps water pumping capacity, models, types. How much water in GPM do different well pump types or models deliver? Relationship of well pump horsepower and water delivery in GPM. Relationship of well depth and water delivery rate in GPM for pumps. How to match the well pump choice to the well depth and water needs. Definitions of TDH Total Dynamic Head, pump lift, flow rate, capacity.
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Water well pump types, models, pumping capacities:

This article compares the pumping capacity in gallons per minute of one line jet pumps, two line jet pumps, submersible pumps, and well pumps of different models and horsepower.

This article includes well pump capacity and model example tables from well pump installation manuals provided by the Water Ace Corporation. [permission requested]



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What is the Pumping Capacity in Gallons per Minute for a 1-Line Shallow Well Jet Pump?

A one-line jet pump can typically raise water from depths of just a few feet (or "0" depth) to about 25 feet in depth, and at water delivery rates of 4 gpm up to as much as 25 gpm depending on the variables we list below the well pump capacity tables shown.

A nice example table of shallow well 1-Line Jet Pump Capacities for 1/2 hp, 3/4, and 1 hp shallow well pumps is provided in the Water Ace Jet Pump Installation Manual and excerpted below to illustrate the factors that determine well pump capacity. Both of the charts below are for one-line jet pumps produced by Water Ace. 1-Line jet pumps intended for shallow well use and made by other manufacturers can be expected to have similar capacities.

Deep well pumping capacity - Water Ace Co. Deep well pumping capacity - Water Ace Co.

[Click to enlarge any image or table]

The Water Ace charts (shown in part above) make clear that the capacity of a one-line shallow well jet pump to deliver water at a given flow rate varies by these factors:

  1. the depth of the well (the bottom scale in the two charts)
  2. the pump horsepower (the color codes indicate pump model and horsepower HP variation)
  3. The well pump model (the right hand table is for the company's more powerful well pump series of 2-line jet pumps)
  4. The condition of well piping, including pipe diameter, length, number of bends or elbows
  5. The presumption that the entire piping system has no leaks

Permission requested, Water Ace Corp. Aug 2010 - Pentair Pump Group.

Watch out: Safety warnings are throughout any pump manufacturer's instructions. Because some pump models are capable of developing internal pressures of more than 100 psi, if your building piping, pressure relief valves, safety controls, wiring, and plumbing are not properly installed, very dangerous conditions including electrical shock, tank explosion, and leaks or floods can occur.

What is the Pumping Capacity in Gallons per Minute for a 2-Line Deep Well Jet Pump?

A two-line jet pump can typically raise water from depths of 30-feet to 80-feet, and at water delivery rates of 4 gpm (gallons per minute) (for a 1/2 hp 2-line jet pump serving an 80 foot deep well) to 16 gpm (for a 1 hp 2-line jet pump serving a 30 foot deep well).

A nice example table of Deep Well 2-Line Jet Pump Capacities for 1/2 hp and 1 hp deep well pumps is provided in the Water Ace Jet Pump Installation Manual and excerpted below to illustrate the factors that determine well pump capacity. Both of the charts below are for 2-line jet pumps produced by Water Ace. 2-Line jet pumps intended for deep well use and made by other manufacturers can be expected to have similar capacities.

Deep well pumping capacity - Water Ace Co. Deep well pumping capacity - Water Ace Co.

The Water Ace charts (shown in part above) make clear that the capacity of a deep well pump to deliver water at a given flow rate varies by these factors:

  1. the depth of the well (the bottom scale in the two charts)
  2. the pump horsepower (the color codes indicate pump model and horsepower HP variation)
  3. The well pump model (the right hand table is for the company's more powerful well pump series of 2-line jet pumps)
  4. The condition of well piping, including pipe diameter, length, number of bends or elbows
  5. The presumption that the entire piping system has no leaks

Permission requested, Water Ace Corp. Aug 2010 - Pentair Pump Group.

Watch out: Safety warnings are throughout any pump manufacturer's instructions. Because some pump models are capable of developing internal pressures of more than 100 psi, if your building piping, pressure relief valves, safety controls, wiring, and plumbing are not properly installed, very dangerous conditions including electrical shock, tank explosion, and leaks or floods can occur.

What is the Pumping Capacity in Gallons per Minute for a Submersible Deep Well Pump?

A submersible deep well water pump (the pump is physically inside the well and at or close to the bottom of the well piping) can typically raise water from depths of 30-feet to hundreds of feet, and at water delivery rates of 4 gpm 25 gpm depending on the variables that we list below. Submersible well pumps are typically offered in horsepower ratings of 1/2 HP, 3/4 HP, 1 HP, and 1 1/2 HP.

Rated water flow rates for pumps range (by horsepower and model) from a nominal 6 gpm to 35 gpm.

Watch out: installing a higher capacity well pump may indeed give faster water flow and higher water system pressure, but if the pump is not properly matched to the well's safe flow rate (by pump selection or pump controls) you can pump all of the water out of your well, run dry, damage the pump, etc. See Define Safe Yield for a Well

A nice example table of Deep Well Submersible Well Pump Capacities is provided in the Water Ace 4-inch (diameter) Submersible Well Pump Installation Manual and excerpted below to illustrate the factors that determine well pump capacity. We have sharpened the text and provided a larger, more legible table (click to enlarge) than the original.

In selecting a well pump the well depth as well as water flow requirements must be considered. While jet pumps have a pickup placed typically 5-feet above the well bottom, when installing a submersible pump it is placed ten feet above the well bottom (maximum) or ten feet below the draw down limit for the well.

[Click to enlarge any image or table]

Deep well pumping capacity - Water Ace Co.

The Water Ace charts (shown in part above) make clear that the capacity of a deep well pump to deliver water at a given flow rate varies by these factors:

  1. the depth of the well (the bottom scale in the two charts) or more accurately, the pumping head or lift in feet
  2. the pump horsepower (the color codes indicate pump model and horsepower HP variation)
  3. The well pump model (the right hand table is for the company's more powerful well pump series of 2-line jet pumps)
  4. The condition of well piping, including pipe diameter, length, number of bends or elbows - friction losses in the piping system
  5. The presumption that the entire piping system has no leaks or obstructions

- Permission requested, Water Ace Corp. Aug 2010 - Pentair Pump Group.

Water Ace asserts that a typical 3-4 bedroom home requires a water delivery rate of 8-12 GPM.

Watch out: the water delivery rate at plumbing fixtures is determined by the water pump as well as building water supply piping and controls. But it is a number independent of the ability of the well itself to deliver a sustained water flow - the well yield. Unless a well pump is protected by one or more special devices to prevent the pump from running without water flowing through it, the pump can be damaged or destroyed.

The water delivery rate is also independent of the total quantity of water that can be run before you run out. See WELL FLOW RATE and see Define Safe Yield for a Well.

Watch out: Safety warnings are throughout any pump manufacturer's instructions. Because some pump models are capable of developing internal pressures of more than 100 psi, if your building piping, pressure relief valves, safety controls, wiring, and plumbing are not properly installed, very dangerous conditions including electrical shock, tank explosion, and leaks or floods can occur.

Readers of this document should also see the water pump types described at and see our other diagnostic guides for water pumps, wells, motors listed in the "More Reading" section below.

Well Pump Capacity Charts Plot Pumping Head vs GPM Flow Rate Curves vs Pump Horsepower

Water pump capacity example chart plots flow rate in GPM against pump head and pump horsepower (C) InspectApedia.com adapted from various sources incl. US EPA & National  EWPReader question: what is the effect of changing from a 1/2 hp to a 1 1/2 hp water pump ?

Currently I have a 1/2 hp water pump that will pump 100 gal in 15 min. I am thinking a 1-1/2 hp water pump will pump water 100 gal in 5 min. What will that do to the existing water line. I don't know if I have 5/8" or 3/4" - B.K. 1/20/2014

Reply: factors affecting the actual water flow rate delivered by a water pump. Check out this example chart plotting water flow in GPM against pump motor size and pumping head resistance.

Indeed, B.K., the flow rate through piping is affected by more than the pump output pressure, to include not just line diameter (typically 1" I.D. or 1 1/4" ID from well to pressure tank and pump) but also friction losses in the piping system which in turn are affected by the total length of piping, the number of bends or elbows, and possibly the presence of constricted fittings anywhere in the run.

[Click to enlarge any image or chart]

Because it is located in the well and under-water, the work described by a submersible well pump is described as "lift" rather than "building pressure". It is the "lift" that overcomes the head pressure of water in the piping system above the pump.

The actual effective water flow rate in gallons per minute (GPM) delivered by the water pump through well piping and fittings to the building is typically described as a curve plotting GPM against the pumping head distance in feet, for pumps of various horsepower or pumping capacity. Most water pump manufacturers provide lift capacity curves for their particular water pumps, plotting horsepower and flow rate and lift height as shown in our example chart above. - National Wells (2014)

The sample well pump capacity chart at above left plots water pump capacity in gallons per minute (GPM) (horizontal axis) against pumping head resistance in feet (vertical axis) for typical 3450 rpm water pump motors in horsepower ranging from 1/2 up to 3 HP. Other well pump capacity charts are in the article above. - Grove Electric (2010), G&G Electric (2010), Water Ace (2010), National Wells (2014)

Typical residential well pumps range in horsepower from 1/2 HP to about 2 HP. You can see in the chart that changing from a 1/2 HP to a 1 1/2 HP well pump, if we stay at the same pumping head resistance and using a 300 ft. head resistance example, we would see a theoretical GPM flow rate change from 4 GPM up to around 7 GPM if all other factors remained the same. To read this chart, follow the 300 Head horizontal line in the chart across from where it crosses the 4 GPM line on the 1/2 HP pump curve over further to the right to see the 1 1/2 HP pump (two models) touching or close to the 300 Head Resistance line at 7 GPM.

If for theoretical argument we exclude other snafus like clogged piping or a low-flow-rate well, the lift distance or head against which the pump has to work is the most significant factor as pump lift capacity varies by pump horsepower and type and location.

Water Pump Size Requirement Calculation - Definition of head pressure or Total Dynamic Head (TDH), Vertical Rise, & Friction Losses in Piping

You have not specified if your well pump is a submersible or is an above-ground unit, nor among above ground units did you specify if this is a 1 line or 2-line jet pump - or a different pump type. As we don't know any of that data, nor the well piping diameter of your installation, its length, bends, etc. a fixed answer would be mere arm-waving speculation.

A well pump needs to be matched to the flow rate capacity of the well itself - lest the pump simply run out of available water, a condition that risks pump damage as well as loss of building water supply.

The well pump also needs to be matched against the lift required - how far water must be lifted from the bottom of the submersible pump in the well to the water pressure tank and controls in the building. Water pump lift can be defined as the force required to overcome the "head pressure" measured in feet. To accurately compute head pressure, expressed as Total Dynamic Head or TDH, the designer adds the pumping level or height that water is moved inside the well, the additional vertical rise from water top to final destination, and the friction losses in the piping system.

In the article above we show tables and charts helpful in determining the required size in HP required for a water pump in a given installation. I recommend against choosing pump size arbitrarily for reasons I cite below: cost, operating life, as well as capacity requirements. Recapping, calculations of required water pump size consider

Watch out: none of the topics listed in your message or in pump GPM capacity above address the potentially controlling effects on water flow rate at a given fixture caused by in-building piping, valves, clogs, etc. Something as simple as a clogged faucet strainer will significantly cut water flow rate there - a problem for which the trouble and expense of changing to a larger horsepower water pump would be very much the wrong "fix".

What you can infer is that you are tripling the pump horsepower - which is a big jump, so it would be reasonable to expect a significantly increased water flow rate - all other components being equal.

Watch out: in some cases of a poor flow-rate well it is the well's recovery rate or flow rate that limits the water flow rate at the building (unless a large buffer storage tank of water is also installed). In such cases, installing a more powerful pump will simply exhaust the well more quickly, leading to loss of water supply entirely.

And a final warning:

Watch out: as well that you have an accurate idea of the trouble and costs involved in tripling the well pump horsepower. A change from a smaller 1/2 hp pump to a 1 1/2 hp model may require electrical wiring changes of wire size or gauge and possibly a change from 120V to 240V service along with appropriate changes in pump controls and switches - all adding to the cost of installation of the new pump.

In sum, I'd want to have a more accurate description of the water flow problem in your building and of the causes of any poor water flow complaints before hopping to install a new larger well pump.

Number of submersible well pump stages determine pump lift capacity

For submersible well pumps, typically higher HP pumps also are designed with a greater number of pumping stages - mechanical impellers that increase the lift capacity of the pump. Below are some submersible pump design stages and horsepower ratings:

Table of Submersible Pump Stages vs HP vs Total Dynamic Head vs. GPM Flow Rate Capacity
Water Pump HP Nr. of Pump Stages TDH Capacity GPM Flow Rate Capacity
1 HP
8
0 - 200 Ft.
4 - 40 GPM (varies by TDH)
1 1/2 HP
11
0 - 399 Ft.
4 - 40 GPM (varies by TDH)
2 HP
14
0 - 350 Ft.
4 - 42 GPM (varies by TDH)
3 HP
19
0 - 500 Ft.
4 - 43 GPM (varies by TDH)
5 HP
28
0 - 700 Ft.
4 - 43 GPM (varies by TDH)

Notes:

The data in this table is for example purposes. Actual pump capacities vary by model, manufacturer, design, and installation details.

Source: adapted from A.Y. McDonald Co. Mfg. (2014)

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Continue reading at WATER PUMP CAPACITY & GPM FAQs or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see WATER PUMP REPAIR GUIDE

Or see TREADLE PUMP CAPACITIES & USE

Or see WATER PUMP, ONE LINE JET

Or see WATER PUMP, SUBMERSIBLE

Or see WATER PUMP, TWO LINE JET

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