Wilo-STAR-Z 20/4-3(150mm) circulation pump 4081193

Circulation pump for efficient water flow

The Wilo-STAR-Z 20/4-3 circulation pump is a reliable solution for closed heating systems and domestic hot water circulation. The pump's construction, with a bronze (Rg 5) body and a glass fiber reinforced polypropylene (PP-GF) impeller, ensures durability and corrosion resistance. This makes the pump ideal for installation in residential and commercial buildings where quiet operation and reliability are required.

Construction and application

The Wilo-STAR-Z 20/4-3 pump is designed to operate in systems with clean water, without solid impurities. Its three-stage motor allows you to adjust the performance to current needs, which translates into energy savings. The mounting length of 150 mm makes it easy to integrate with existing installations. It is intended for circulating operation in central heating, domestic hot water and air conditioning systems. It is worth noting its resistance to water hardness - it can operate in systems with a hardness of up to 18°dH.

Key features and benefits

• Durability and reliability: The bronze body and PP-GF impeller guarantee a long pump life, even in difficult operating conditions.
• Quiet operation: The pump design minimizes noise, which is especially important in residential buildings.
• Energy saving: The three-stage motor allows you to adjust the performance to the demand, reducing electricity consumption.
• Blockage protection: The motor is protected against overload in the event of impeller blockage.
• Easy installation: Compact dimensions and standard connections (G 1¼ inch) make it easy to install the pump in existing systems.
• Wide temperature range: The pump can operate with water temperatures from 2°C to 65°C and in an environment from 0°C to 40°C.
• High efficiency: The maximum pump capacity is 3.68 m³/h, and the maximum head is 4.7 m.
• Maintenance-free: The pump design ensures quiet operation and prevents scale build-up, eliminating the need for frequent inspections and maintenance.

Additional information: The IP44 degree of protection provides protection against splashing water, and the F insulation class guarantees safe use. The pump has ISO 228-1 connections on both sides and a tapered external gas thread (BSPP). The maximum working pressure is 10 bar.