Wilo Sub-TWI 5 borehole submersible pump (5")
Sub-TWI 5 is a 5" multistage submersible pump whose housing, stages and impellers are made of stainless steel, designed for water supply from wells, cisterns and tanks, irrigation and rainwater use. The series has 11 single-phase models from 0.55 to 1.5 kW, all with an integrated float switch (FS).
- Design
- 5" multistage submersible pump, self-cooling motor
- Materials
- Housing, stages, impellers and shaft in stainless steel 1.4301 (AISI 304)
- Mechanical seal
- Double seal: SiC/SiC and carbon/ceramic; gasket NBR
- Fluid temperature
- +5 / +35 °C
Models (11)
| Code | Model | Rated power (kW) | Rated power (HP) | Hydraulic range |
|---|---|---|---|---|
| 4144935 | Sub-TWI 5 304 FS | 0.55 | 0.7 | 300 range |
| 4144936 | Sub-TWI 5 305 FS | 0.75 | 1 | 300 range |
| 4144937 | Sub-TWI 5 306 FS | 0.75 | 1 | 300 range |
| 4144938 | Sub-TWI 5 307 FS | 1.1 | 1.5 | 300 range |
| 4144939 | Sub-TWI 5 308 FS | 1.1 | 1.5 | 300 range |
| 6089414 | Sub-TWI 5 309 FS | 1.5 | 2 | 300 range |
| 6089413 | Sub-TWI 5 310 FS | 1.5 | 2 | 300 range |
| 4144940 | Sub-TWI 5 504 FS | 0.75 | 1 | 500 range |
| 4144941 | Sub-TWI 5 505 FS | 0.9 | 1.2 | 500 range |
| 4144942 | Sub-TWI 5 506 FS | 1.1 | 1.5 | 500 range |
| 6089412 | Sub-TWI 5 507 FS | 1.5 | 2 | 500 range |
Series specifications
| Design | 5" multistage submersible pump, self-cooling motor |
|---|---|
| Materials | Housing, stages, impellers and shaft in stainless steel 1.4301 (AISI 304) |
| Mechanical seal | Double seal: SiC/SiC and carbon/ceramic; gasket NBR |
| Fluid temperature | +5 / +35 °C |
| Max. operating pressure | 10 bar |
| Electrical | 1~230 V, 50 Hz · IP 68 · thermal motor protection |
| Supplied with | 20 m cable, plug with on/off switch, integrated float switch |
| Approvals | KTW and TÜV |
How to choose
- Hydraulic range: There are two hydraulic ranges, 300 and 500. Pick the range from the Sub-TWI 5 curves in the catalogue according to required flow and head.
- Power: Within a range, motor power rises with the model number (0.55 to 1.5 kW in the 300 range, 0.75 to 1.5 kW in the 500 range).
- Installation: The motor is self-cooling; the catalogue states that the pump can also be installed outside the water, which helps in cisterns and tanks.
- Limits: Water temperature between +5 and +35 °C, operating pressure no more than 10 bar.
How to write it in a quote
State code, model, power and connection: "Wilo 4144937 Sub-TWI 5 306 FS 5" borehole submersible pump, 0.75 kW, 1~230 V, integrated float switch, 20 m cable". Add riser pipe, check valve and controls as separate lines if needed.
FAQ
What does FS mean on Sub-TWI 5?
FS stands for the integrated float switch. All 11 models in the series are FS versions.
Can the pump run outside the well?
Yes. The motor is self-cooling and the catalogue states that the pump can also be installed outside the water.
Are cable and plug included?
Yes. A 20 m cable and a connection with on/off switch are included, so the single-phase models are ready to plug in.
What water temperature is allowed?
The fluid temperature must be between +5 and +35 °C.
Information compiled from the Wilo product documents. Tekliva does not sell products or publish prices.
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