The Grundfos 385S250-3 (product number 97773904) is a large-diameter SP-G stainless steel submersible well pump rated 405 US GPM at 167.3 ft of head, driven by a 25 HP three-phase MS6000 submersible motor. All wetted parts — pump, impellers and motor shell — are AISI 304 stainless steel, and the pump carries cUL / cCSA drinking-water listings.
Performance Curve
Official Grundfos curve — 60 Hz, 3×460 V, water at 68 °F. Head (H) and efficiency (η) against flow (Q); lower chart shows power (P1 input / P2 shaft) and NPSH required. Duty point 405 GPM @ 167.3 ft.
Performance & Hydraulic Data
| Rated flow | 405 US GPM |
| Rated head | 167.3 ft |
| Maximum head (shutoff) | ~290 ft |
| Stages | 3 (no reduced-diameter impellers) |
| Pump speed (data basis) | 3,450 RPM |
| Maximum operating pressure | 870 psi |
| Maximum outlet pressure | 130.5 psi |
| Built-in return (non-return) valve | Yes |
| Curve tolerance | ISO 9906:2012 grade 3B |
Materials of Construction
| Pump housing | Stainless steel — EN 1.4301 / AISI 304 |
| Impellers | Stainless steel — EN 1.4301 / AISI 304 |
| Motor shell | Stainless steel — DIN W.-Nr. 1.4301 / AISI 304 |
| Motor shaft seal | SiC / SiC-NBR |
Installation & Connections
| Discharge connection | 4 inch NPT (female) |
| Motor diameter | 6 inch |
| Minimum borehole diameter | 7.4 in |
| Liquid temperature range | 5 °F to 104 °F |
| Pumped liquid | Water (clean, non-aggressive) |
Motor & Electrical Data
| Rated power (P2) | 25 HP |
| Motor type | Grundfos MS6000 submersible |
| Voltage & phase | 3 × 440-460-480 V, three-phase |
| Frequency | 60 Hz |
| Rated speed | 3,460–3,490 RPM (2-pole) |
| Rated current | 41.0 / 40.0 / 39.5 A |
Approvals, Weights & Identification
| Drinking-water approval | cUL / cCSA (CULDWUS, CCSAUS); California Prop 65 |
| Grundfos product number | 97773904 |
| Type key | 385S250-3 3×460V 4"NPT G6" CVT |
| EAN | 5710624150405 |
| Net weight | 188 lb |
| Gross (shipping) weight | 271.7 lb |
| Overall length | 74 in |
Official Datasheet
📄 View the Grundfos 385S250-3 Data Sheet Grundfos product data 16B73603
Typical Applications
Municipal and community water supply • high-capacity groundwater abstraction • irrigation and agriculture • mine dewatering • industrial process water • pressure boosting from deep wells. The large-diameter SP-G design suits 8-inch and larger wells where high flow at moderate head is required.
Need help? Contact ForeverPure Place for pricing, lead time, a matching motor/control package, cable sizing, or help selecting the correct SP model and stage count for your well.
