Circulator pump WILO YONOS PICO1.0 25/1-4 — compact high-efficiency heating circulator

WILO YONOS PICO1.0 25/1-4 is a compact high-efficiency heating circulator designed for central heating and hot-water circulation in residential and light-commercial systems. With a nominal diameter of 25 and four selectable performance stages, this circulator provides consistent flow for radiators, boilers and small heat exchangers while minimising energy consumption. Its compact body and standard flange connections allow straightforward replacement of older pumps and easy integration into new installations.

Advantages

The pump delivers stable hydraulic performance across four adjustable speed settings, enabling matching of flow and head to system demand. Low electrical consumption and standby behaviour reduce operating costs. Built with corrosion-resistant components and a compact motor assembly, the unit offers long service life and reduced maintenance requirements. The compact footprint and standard installation dimensions simplify mounting in tight plant rooms or boiler cabinets.

Suitable for

• Domestic central heating systems with radiator circuits
• Boiler and hot-water circulation in small commercial buildings
• Circulation to and from small heat exchangers and buffer tanks
• Replacement of older circulators with compatible flange dimensions

Key specifications

• Nominal pipe connection size: 25 mm
• Adjustable performance: multi-stage selection (1–4)
• Designed for circulating heated water in closed heating systems
• Compact dimensions for installation in confined spaces
• Low electrical power consumption and energy-efficient operation
• Corrosion-resistant hydraulic wet rotor design
• Standard flange connection for quick retrofit or new installation

How to use

Fit the circulator into the heating circuit following the system manufacturer’s instructions and local installation standards, ensuring correct flow direction and secure flange connections. Select the appropriate performance stage (1–4) to match system head loss and desired flow rate; start with the lowest setting and increase if heating delivery is insufficient. Bleed air from the system after installation and verify pump operation and electrical connections before commissioning.

Usage recommendations

Use with compatible heating fluids (treated water) in closed systems and avoid running the pump dry. Periodic inspection for leaks, correct alignment and system air content helps maintain efficiency. When replacing an older circulator, verify flange and shaft dimensions to ensure direct compatibility and minimise installation effort.