Wilo-Sub TWI 4

The Wilo‑Sub TWI 4 is a stainless steel borehole submersible pump designed for clean water supply, irrigation, pressure boosting, and lowering water levels. It’s part of Wilo’s Sub TWI series, optimized for durability, efficiency, and flexible installation.

Category: Submersible Pumps

Description

The Wilo‑Sub TWI 4 is a stainless steel borehole submersible pump engineered for reliable clean water supply, irrigation, pressure boosting, and groundwater management. Its corrosion‑resistant construction ensures long service life, while multi‑stage hydraulics with radial or semi‑axial impellers deliver efficient performance across a wide range of heads. Certified for potable water applications, the Sub TWI 4 is suitable for both domestic and municipal systems. With flexible installation options in vertical or horizontal configurations, integrated check valve protection, and optional dry‑run safeguards, it offers dependable operation and easy integration into diverse water management setups.

Stainless steel construction: Corrosion‑resistant design ensures durability and long service life.
Multi‑stage hydraulics: Radial or semi‑axial impellers provide efficient performance across varying heads.
Potable water certification: NSF/ANSI 61 approved for safe drinking water applications.
Flexible installation: Suitable for vertical or horizontal installation in boreholes or tanks.
Motor compatibility: NEMA standard motors up to 250 HP, with control boxes and VFD options.
Integrated check valve: Protects the system and prevents backflow.
Dry‑run protection: Optional float switch or level sensor safeguards against damage.
Cooling requirements: Minimum cooling flow speed must be ensured for submerged operation.

Designed for pumping drinking water (in accordance with ACS and RI.SE), rainwater and process water with up to 50 g/m³ sand content from wells and rainwater storage tanks for the following applications:

Irrigation
Sprinkling
Water supply
Pressure boosting
Ground water drainage and lowering

Long service life thanks to corrosion-resistant stainless steel, optionally in V4A quality
ACS certified for drinking water applications
A high degree of flexibility thanks to versions in the 4, 6, 8 and 10-inch area
High range of performance from 1 to 250 m³/h

Download the Wilo-Sub TWI 4 Installation Manual