Circulation Pump WILO Yonos Maxo 40/0.5-8 (MPN 2120646) – high-efficiency single-pump for heating systems

The WILO Yonos Maxo 40/0.5-8 is a high-efficiency circulation pump engineered for central heating and domestic hot-water recirculation systems. Designed with a flange connection and an adjustable head range, this single-pump model provides continuous fluid movement to maintain even heat distribution and stable system operation in residential and light-commercial installations.

Advantages

The pump combines energy-efficient motor technology with precise hydraulic control to reduce power consumption while maintaining required flow rates. Its compact design and standard flange interface simplify installation and replacement in existing heating circuits. Variable head adjustment allows adaptation to different system resistances without the need for additional components. Built for continuous operation, the unit supports reliable circulation with reduced noise and maintenance needs.

Suitable for

• Central heating loops in single-family homes and small apartment buildings
• Boiler circuit circulation and heat generator integration
• Domestic hot-water recirculation to reduce wait times and water waste
• Replacement of existing flange-mounted heating pumps with similar hydraulic requirements

Key specifications

• Connection type: flange connection (DN 40)
• Adjustable hydraulic head range: approximately 0.5–8 m
• Application: circulation for heating and hot-water systems
• Design: single-pump, continuous-duty construction
• Flow control: adjustable to system resistance for optimized circulation

How to use

Install the pump in the return or delivery line of the heating circuit according to piping and flow direction markings. Ensure correct flange alignment, tighten bolted connections to the recommended torque, and follow local regulations for electrical connection by a qualified electrician. Adjust the pump head to the required setting based on system design and measured pressure/flow characteristics. After installation, purge air from the system and perform functional checks to verify stable flow, correct direction, and absence of leaks.

Usage recommendations

For energy-efficient operation, set the pump to the lowest head that meets system performance requirements and use automatic control strategies where available. Regularly check for air in the circuit and appropriate system water quality to prevent cavitation and corrosion. Service intervals should follow manufacturer guidance and local regulations; when replacing an existing unit, compare hydraulic curves and connection dimensions to ensure compatibility.