The Grundfos 25S20-11 (product number 51536115) is a SP5A stainless steel submersible well pump rated 26.4 US gpm at 239.5 ft across 11 stages, supplied complete with a three-phase Grundfos submersible motor.
Performance Curve
Official Grundfos curve — 60 Hz, water at 68 °F. Head (H) and efficiency (η) against flow (Q); lower chart shows power and NPSH required.
Performance & Hydraulic Data
| Rated flow | 26.4 US gpm |
| Rated head | 239.5 ft |
| Stages | 11 |
| Pump speed (data basis) | 3450 rpm |
| Pump type | SP5A |
| US designation | SP5A-11 |
| Maximum operating pressure | 217.56 psi |
| Maximum outlet pressure | 150.84 psi |
| Built-in return valve | Yes |
| Curve tolerance | ISO9906:2012 3B |
Materials of Construction
| Pump housing | Stainless steel — EN 1.4301 — AISI 304 |
| Impellers | Stainless steel — EN 1.4301 — AISI 304 |
Installation & Connections
| Discharge connection | 1 1/2 NPT(F) |
| Motor diameter | 4 inch |
| Minimum borehole diameter | 4.13 in |
| Overall length | 28.9 in |
| Liquid temperature range | 5 °F to 104 °F |
Motor & Electrical Data
| Voltage & phase | 460 V, three-phase |
| Frequency | 60 Hz |
| Enclosure class | IP68 |
| Motor cable | 3.94 ft |
| Grundfos motor number | 79362006 |
Approvals, Weights & Identification
| Approvals | CULDWUS,CCSAUS |
| Drinking water | PROP65 |
| Grundfos product number | 51536115 |
| Pump-end number | 05010011 |
| EAN | 5700394508353 |
| Net weight (pump + motor) | 32.3 lb |
| Gross (shipping) weight | 46.1 lb |
| Country of origin | MX |
| HS / customs tariff code | 8413.70.2004 |
Typical Applications
Well and borehole water supply • groundwater abstraction • irrigation • pressure boosting • livestock and rural water • industrial process water.
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