Circulation pump WILO Star-Z 25/6-3 — drinking water, wet rotor, 180 mm length, G1 1/2 connection

WILO Star-Z 25/6-3 is a drinking water circulation pump with a wet rotor design, created to maintain continuous recirculation of hot or cold water in domestic and commercial plumbing systems. With a compact installation length of 180 mm and G1 1/2 threaded connections, this pump is designed for straightforward integration into circulation loops to reduce waiting times at taps and to prevent water stagnation in piping.

Advantages

The wet rotor construction offers quiet operation and requires no separate shaft sealing, which reduces maintenance needs. Its compact 180 mm length and standard G1 1/2 connection facilitate installation in tight spaces and retrofit situations. The pump is intended for continuous duty, supporting reliable circulation to maintain temperature and water quality in drinking water systems.

Suitable for

• Domestic hot water circulation in single- and multi-family buildings
• Commercial washrooms and public buildings requiring reduced tap wait times
• Systems aimed at reducing water stagnation and maintaining water hygiene
• Retrofit projects where compact pump length is required

Key specifications

• Pump type: wet rotor circulation pump for drinking water
• Nominal size: 25/6-3
• Installation length: 180 mm
• Connections: G1 1/2 threaded
• Application: continuous circulation for hot and cold potable water

How to use

Install the WILO Star-Z 25/6-3 in the circulation loop following local plumbing codes and manufacturer mounting orientation recommendations. Connect the pump using the G1 1/2 threaded ports and ensure all joints are sealed and pressure-tested before operation. Commission the pump by verifying correct electrical supply and set the required operating mode according to system design. Monitor the installation during the initial hours to confirm leak-free connections and proper flow.

Usage recommendations

For prolonged service life, ensure the system water is within permissible temperature and quality ranges for drinking water pumps, protect the unit from dry run conditions, and schedule periodic visual inspections. When used for potable water circulation, comply with local regulations on drinking water installations and material compatibility.