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A nominal 7 GPM pump family for household wells, small water supplies and modest irrigation demands. It provides a choice of six hydraulic sizes for matching the pumping water level and delivery-pressure requirement without moving to a larger nominal-flow family.
Grundfos 7S belongs to the SP range of multistage stainless steel submersible pumps. The complete pump combines the hydraulic pump end with the Grundfos submersible motor identified by the selected part number. Stainless steel impellers, chambers, strainer, straps and cable guard provide a corrosion-resistant construction for clean-water service. Stage count determines the available head within the family.
Water-lubricated bearings incorporate channels that allow sand particles to pass with the pumped water. An inlet strainer limits entry of larger particles, a built-in check valve limits reverse flow after shutdown, and a stop ring limits axial shaft movement during startup. The pump must remain submerged and operate within the permitted sand content and motor-cooling conditions.
All listed assemblies use 4-inch motors for 4-inch and larger wells. Select the complete-pump part number using horsepower, voltage, phase and motor/wiring configuration. Control equipment and installation accessories are ordered separately.
The 7S family is rated at 7 GPM. The table below gives the manufacturer's nominal total dynamic head for each hydraulic model at rated flow. A head range reflects differences among the listed motor and electrical configurations. These figures are nominal duty data, not shut-off head or maximum well depth.
To select a pump, add the lift from the pumping water level to the delivery point, the required outlet pressure expressed as head, and piping friction loss. Confirm that the selected pump curve meets that total head at your required flow. Use the pumping water level under load, not the drilled depth of the well.
| Model | HP | Nominal flow (GPM) | Nominal TDH (ft) | Discharge | Minimum well (in) |
|---|---|---|---|---|---|
| 7S05-8 | 1/2 | 7 | 164 | 1 in NPT | 4 |
| 7S05-11 | 1/2 | 7 | 222 | 1 in NPT | 4 |
| 7S07-15 | 3/4 | 7 | 303 | 1 in NPT | 4 |
| 7S10-19 | 1 | 7 | 385 | 1 in NPT | 4 |
| 7S15-26 | 1-1/2 | 7 | 525 | 1 in NPT | 4 |
| 7S20-32 | 2 | 7 | 630 | 1 in NPT | 4 |
Performance data: Grundfos SP data booklet, pages 37-38. Where both 4-inch and 6-inch motor assemblies are available, select the appropriate well size for the chosen part number. See the full curves for operation away from rated flow.
The part numbers below are complete pump assemblies, including the pump end and motor. A matching control box is required for 3-wire single-phase motors and is sold separately. Three-phase motors require suitable starting and protection equipment, also sold separately.
| Model | HP | Voltage & phase | Motor diameter | Wiring | Complete pump part no. |
|---|---|---|---|---|---|
| 7S05-11 | 1/2 | 115V 1Ph | 4 in | 2-Wire | 3019211 |
| 7S05-11 | 1/2 | 115V 1Ph | 4 in | 3-Wire | 3014211 |
| 7S05-8 | 1/2 | 230V 1Ph | 4 in | 2-Wire | 31595085 |
| 7S05-8 | 1/2 | 230V 1Ph | 4 in | 3-Wire | 31545085 |
| 7S05-11 | 1/2 | 230V 1Ph | 4 in | 2-Wire | 31595115 |
| 7S05-11 | 1/2 | 230V 1Ph | 4 in | 3-Wire | 31545115 |
| 7S07-15 | 3/4 | 230V 1Ph | 4 in | 2-Wire | 31595155 |
| 7S07-15 | 3/4 | 230V 1Ph | 4 in | 3-Wire | 31545155 |
| 7S10-19 | 1 | 230V 1Ph | 4 in | 2-Wire | 31595195 |
| 7S10-19 | 1 | 230V 1Ph | 4 in | 3-Wire | 31545195 |
| 7S15-26 | 1-1/2 | 230V 1Ph | 4 in | 2-Wire | 31595265 |
| 7S15-26 | 1-1/2 | 230V 1Ph | 4 in | 3-Wire | 31545265 |
| 7S15-26 | 1-1/2 | 230V 3Ph | 4 in | 3-Phase | 31530265 |
| 7S15-26 | 1-1/2 | 460V 3Ph | 4 in | 3-Phase | 31536265 |
| 7S20-32 | 2 | 230V 1Ph | 4 in | 3-Wire | 3014532 |
| 7S20-32 | 2 | 230V 3Ph | 4 in | 3-Phase | 31530325 |
| 7S20-32 | 2 | 460V 3Ph | 4 in | 3-Phase | 31536325 |
2-wire single-phase selections do not require an external starting control box. The 115V and 230V choices are separate complete-pump part numbers; match the selected motor to the supply.
| Specification | Value |
|---|---|
| Product supplied | Complete SP pump: hydraulic pump end plus submersible motor |
| Rated flow | 7 GPM nominal; actual flow depends on the selected model and system head |
| Horsepower | 1/2 to 2 HP |
| Frequency | 60 Hz |
| Supply options | 115V 1Ph; 230V 1Ph; 230V 3Ph; 460V 3Ph |
| Motor diameter | 4 in |
| Motor families | MS402, MS4000C; configuration depends on selected assembly |
| Discharge | 1 in NPT |
| Well diameter | All listed assemblies use 4-inch motors for 4-inch and larger wells. |
| Pumped liquid | Clean, thin water without fibers or larger solid particles; verify water chemistry against the selected materials |
| Maximum sand content | 50 ppm for SP 5S-25S |
| Minimum pump submergence | 2 ft below pumping water level, subject to installation requirements and adequate motor cooling |
| Motor cooling / temperature | Observe the selected motor rating and required flow past the motor. Standard MS402/MS4000 operation up to 104°F requires at least 0.25 ft/s cooling flow; standard MS6000 T40 requires 0.50 ft/s. Drinking-water applications must not exceed 86°F. |
| Dry-running protection | External protection required if water level can fall below the inlet. The priming screw is not an electronic dry-run cutout. |
| Starting and protection | 2-wire single-phase: no external starting box. 3-wire single-phase: matched control box required. Three-phase: suitable starter and motor protection required. |
| Variable-speed operation | Compatible three-phase motors may be used with a properly selected external VFD; observe motor frequency, cable/filter and cooling requirements. Drive and controls are separate. |
Overall length and motor length vary with the selected electrical configuration. The ranges below cover the complete-pump options listed above. Shipping weights are approximate values from the price sheet; they are not net pump weights.
| Model | Motor diameter | Motor family | A: overall (in) | B: motor (in) | C: pump end (in) | Approx. ship wt (lb) |
|---|---|---|---|---|---|---|
| 7S05-8 | 4 in | MS402 | 23.75 | 11.03 | 12.72 | 26-32 |
| 7S05-11 | 4 in | MS402 | 26.23 | 11.03 | 15.20 | 27-34 |
| 7S07-15 | 4 in | MS402 | 30.12 | 11.62 | 18.51 | 31-33 |
| 7S10-19 | 4 in | MS402 | 34.02 | 12.21 | 21.82 | 36-44 |
| 7S15-26 | 4 in | MS402 | 39.81-41.30 | 12.21-13.71 | 27.60 | 42-46 |
| 7S20-32 | 4 in | MS4000C / MS402 | 46.26-52.05 | 13.71-19.49 | 32.56 | 46-50 |
Use the selected motor nameplate and the electrical-data tables when sizing conductors, overload protection and starting equipment. Confirm final assembly dimensions against the ordered motor and pump-end combination before installation.
| Component | Standard material |
|---|---|
| Impellers and chambers | AISI 304 stainless steel |
| Valve casing and suction interconnector | Cast stainless steel, EN 1.4308 (standard S construction) |
| Strainer, straps and cable guard | AISI 304 stainless steel |
| Pump shaft | Stainless steel, EN 1.4057 |
| Bearings | NBR elastomer |
| Neck rings | NBR/TPU |
| Stop-ring washer | Carbon/graphite in PTFE mass |
| Motor | Water-filled Grundfos submersible motor; materials and seal design depend on motor type |
These listings cover the standard S-series construction. Optional 316 or 904L variants and special elastomers are separate configurations and are not implied by these part numbers.
For tank, horizontal or other nonstandard installations, confirm motor cooling and positional requirements. An angled installation requires an additional discharge-line check valve in accordance with the SP data booklet.
Type key. In 7S05-8, 7 identifies nominal flow in GPM, S identifies the standard stainless steel series, the following number identifies motor horsepower, and -8 identifies the number of impellers. The number after the hyphen is a stage count, not a head rating in feet.
Choose the variant. Select HP - Voltage, then Model, then Motor & Wiring. Use the complete-pump part number to place the order. The same hydraulic model may have multiple motor configurations and part numbers.
What is included. Hydraulic pump end and the motor specified by the selected complete-pump SKU. Control boxes, starters, external VFDs, pressure switches, tanks, drop cable, drop pipe and other installation accessories are ordered separately.
Controls. Match the control box or starter to the selected motor horsepower, voltage and phase. Where dry-running or additional motor monitoring is required, specify suitable separate protection equipment.
The free Grundfos GO app gives you setup, status overviews, technical product information and live operating parameters from an iOS or Android device. Pair the pump directly with your phone, no extra module needed.
Grundfos GO is a free app from Grundfos Holding A/S.
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