Grundfos SQ 3" Submersible Borehole Pumps
The Grundfos SQ range is the most compact submersible solution for groundwater extraction. At just 3″ (74mm) diameter, these long, lean pumps fit perfectly into small boreholes or 4″ boreholes that have become restricted due to ochre deposits over time. With built-in electronics, dry-running protection, and soft start technology, the SQ pump delivers exceptional reliability for domestic and commercial water supply applications.
As an authorized Grundfos Water Pump Dealer in Dubai, we supply the complete SQ and SQN range with genuine warranty and technical support across the UAE.
Technical Specifications
| Parameter | Specification |
|---|---|
| Maximum Flow Rate | Up to 7 m³/h (SQ/SQN 7) |
| Maximum Head | Up to 180 metres (SQ/SQN 1) |
| Nominal Voltage Range | 1 x 200-240V |
| Frequency | 50/60 Hz |
| Maximum Media Temperature | 30°C (40°C on request) |
| Pump Diameter | Ø74 mm (3″) |
| Minimum Well Diameter | Ø76 mm |
| Weight Range | 4.7 – 6.4 kg |
| Thread Connections | RP 1¼ / RP 1½ |
| Material | Stainless steel DIN W.-Nr. 1.4301, AISI 304 |
| Installation Options | Vertical or horizontal |
Performance Range
| Model Series | Flow Range | Head Range |
|---|---|---|
| SQ/SQN 1 | Low flow | Up to 180 m |
| SQ/SQN 2 | Medium flow | Up to 150 m |
| SQ/SQN 3 | Medium flow | Up to 120 m |
| SQ/SQN 5 | Higher flow | Up to 90 m |
| SQ/SQN 7 | Up to 7 m³/h | Up to 60 m |
Performance Data
| Flow (m³/h) | Flow (l/s) | Pressure Range (kPa) | Head Range (m) |
|---|---|---|---|
| 0 – 1 | 0 – 0.3 | 100 – 2000 | 10 – 200 |
| 1 – 3 | 0.3 – 0.8 | 100 – 1500 | 10 – 150 |
| 3 – 5 | 0.8 – 1.4 | 100 – 1000 | 10 – 100 |
| 5 – 7 | 1.4 – 2.0 | 100 – 600 | 10 – 60 |
| 7 – 8 | 2.0 – 2.5 | 100 – 400 | 10 – 40 |
Key Features & Benefits
Unique 3″ Design The compact 74mm diameter enables installation in the smallest boreholes (minimum 76mm well diameter) while delivering reliable performance. Ideal for existing 4″ wells that have become restricted by mineral deposits.
Soft Start Technology Reduces wear on the motor and minimizes stress on the entire installation during startup. This extends pump lifetime and protects pipework from pressure surges.
Dry-Running Protection Built-in protection automatically stops the pump if water level drops below safe operating level, preventing motor burnout and seal damage from running without water.
Overload Protection Integrated motor protection safeguards against electrical overload conditions, ensuring reliable operation under varying load conditions.
Automatic Restart Following a protection shutdown, the pump automatically attempts to restart, reducing the need for manual intervention and ensuring continuous water supply.
Wide Voltage Window Handles voltage fluctuations common in rural and remote installations, providing reliable operation despite unstable power supply conditions.
All Stainless Steel Exterior Complete AISI 304 stainless steel construction minimizes corrosion risk, ensuring long service life even in aggressive groundwater conditions.
Built-In Electronics Integrated control electronics eliminate the need for external control boxes, simplifying installation and reducing system complexity.
Permanent Magnet Motors High-efficiency permanent magnet motor technology delivers superior performance with lower energy consumption compared to conventional induction motors.
2-Wire Connection Simple two-wire installation requires no external control box, reducing installation time and costs while minimizing potential failure points.
High Starting Torque Capable of handling deep settings and overcoming initial system resistance for reliable startup in demanding applications.
Installation Flexibility
The SQ pump can be installed:
Vertically Standard installation in boreholes and wells with the pump suspended on the rising main.
Horizontally Suitable for applications such as tank extraction, rainwater harvesting, or installations where vertical mounting is not practical.
Applications
Domestic Water Supply Private homes and residential properties requiring reliable groundwater extraction from narrow boreholes.
Small Water Works Community water supply systems and small-scale distribution networks serving multiple properties.
Irrigation Systems Agricultural and horticultural irrigation requiring consistent water delivery from groundwater sources.
Groundwater Lowering Construction dewatering and water table management in confined spaces where larger pumps cannot be deployed.
SQ vs SQN Models
| Feature | SQ | SQN |
|---|---|---|
| Material | AISI 304 Stainless Steel | AISI 304 Stainless Steel |
| Built-in Electronics | Yes | Yes |
| Dry-Running Protection | Yes | Yes |
| Soft Start | Yes | Yes |
| Overload Protection | Yes | Yes |
| Automatic Restart | Yes | Yes |
Why Choose Grundfos SQ?
Compact Reliability The unique 3″ design combined with comprehensive built-in protection features makes the SQ one of the most reliable choices for submersible operation in narrow boreholes.
Simplified Installation Two-wire connection and built-in electronics eliminate external control boxes, reducing installation complexity and cost.
Long Service Life Soft start reduces mechanical stress, stainless steel construction resists corrosion, and dry-running protection prevents damage—all contributing to extended pump lifetime.
Energy Efficiency Permanent magnet motor technology delivers superior efficiency, reducing operating costs over the pump’s lifetime.
Voltage Tolerance Wide operating voltage range handles the fluctuations common in rural installations, ensuring reliable operation regardless of power quality.
Borehole Compatibility
| Borehole Size | SQ Suitability |
|---|---|
| 3″ (76mm) | ✓ Minimum size – direct fit |
| 4″ (100mm) | ✓ Ideal – standard installation |
| 4″ restricted by ochre | ✓ Fits where 4″ pumps cannot |
| Larger boreholes | ✓ With centering guides |
Genuine Grundfos Accessories & Parts
Maintain optimal SQ pump performance with original components including drop cables, cable guards, motor lead connectors, check valves, and centering guides. We stock replacement parts and accessories for all SQ and SQN series models.
Select Grundfos Pumps
Browse our complete inventory of Grundfos SQ 3″ submersible borehole pumps. As Grundfos Pump Suppliers in Dubai, we provide competitive pricing, technical consultation, and prompt delivery across Dubai, Sharjah, Abu Dhabi, Ajman, and all UAE locations.
Contact us for:
- Pump selection based on borehole depth and yield
- Flow and head requirement calculations
- Cable sizing recommendations
- System design assistance
- Competitive quotations
- Delivery schedules
Compact Performance, Maximum Reliability
The Grundfos SQ range proves that exceptional performance can come in compact packages. Whether extracting water from narrow domestic boreholes, restricted wells, or specialized applications requiring horizontal installation, these 3″ submersible pumps deliver reliable groundwater supply with built-in intelligence that protects both the pump and your investment.