Wilo Yonos PICO 25/1-8 Circulating Pump

The Wilo Yonos PICO 25/1-8 circulator pump, reference 4215517, is a high-efficiency electronically controlled pump designed for water circulation in heating and air conditioning systems. It offers a maximum flow rate of 4.4 cubic meters per hour and a maximum head of 7.6 meters, with different control modes that allow it to adapt its operation to radiators, underfloor heating and other hydraulic systems.

Its synchronous motor with ECM technology, integrated electronic control and an energy efficiency index equal to or lower than 0.23 allow the pump operation to be adjusted to the actual needs of the circuit. It also includes an LED display, venting function, automatic unlocking, motor protection and a Wilo electrical connector to simplify installation and commissioning.

High-efficiency circulator pump for heating and air conditioning

The Wilo Yonos PICO is designed as a maintenance-free wet rotor circulator pump. In this type of construction, the rotor operates in contact with the pumped fluid, providing suitable operation for continuous circulation in building hydraulic systems.

Wilo specifies this model for heating and air conditioning applications and allows different control strategies to be selected according to the characteristics of the circuit.

Maximum flow rate of 4.4 cubic meters per hour

The Yonos PICO 25/1-8 reaches a maximum flow rate of 4.4 cubic meters per hour. Its actual operation will depend on the hydraulic resistance of the circuit and the operating point required by the installation.

The integrated electronic control allows the pump behavior to be adjusted so that the available flow and pressure are adapted to the needs of the system, avoiding permanent operation at maximum speed when this is not necessary.

Maximum head of 7.6 meters

This model provides a maximum head of 7.6 meters, placing it within the Yonos PICO range intended for installations that require high pumping capacity.

This feature makes it suitable for heating or air conditioning circuits with different pressure losses, provided that the required operating point is within the pump hydraulic curve.

Three control modes

The Wilo Yonos PICO 25/1-8 incorporates three main control types, allowing operation to be adapted to different hydraulic systems.

The variable differential pressure mode progressively reduces the pressure provided by the pump when the required flow decreases. It is especially useful in installations where thermostatic valves or other elements constantly change the circuit resistance.

The constant differential pressure mode keeps the selected value practically constant within the operating range, a solution especially suitable for certain circuits such as underfloor heating systems.

It also features constant speed with three selectable curves, allowing it to operate similarly to a traditional multi-speed circulator pump when the installation requires it.

Suitable for radiators and underfloor heating

Thanks to the different control modes, the pump can be configured according to the type of emitter installed. Wilo expressly considers the selection of the operating mode according to applications involving radiators and underfloor heating.

This versatility makes it possible to use a single pump in numerous heating and air conditioning systems, adjusting the hydraulic behavior to the characteristics of each circuit.

LED display to view the main parameters

The pump includes a segment LED indicator that makes configuration and monitoring easier directly from the front of the unit.

The display shows the setpoint value, the current flow rate, the electrical consumption and any fault codes. In this way, the installer can quickly check the operating status without using external instruments for basic adjustment operations.

Control via green button

Configuration is carried out using Wilo's characteristic green button. This control allows the main parameters to be selected easily during commissioning.

The system combines the rotary control with the LED display to make it easier to adjust the head, speed or corresponding control mode.

Manual venting function

The Yonos PICO incorporates a manual venting function designed to help remove air accumulated in the motor compartment.

This function is especially useful during commissioning after filling the circuit, helping to achieve correct hydraulic operation.

Automatic unlocking and manual restart

Wilo equips this pump with an automatic unlocking function. The motor is blockage-resistant and the electronic system includes functions designed to restore operation in certain situations.

It also features manual restart, allowing action to be taken on the unit when it is necessary to restore operation after certain incidents.

Synchronous motor with ECM technology

The pump uses a high-efficiency synchronous motor with ECM technology and integrated electronic power control.

The motor operates with single-phase 230-volt power supply, with a 10 percent tolerance, and a frequency of 50 or 60 hertz.

The operating speed can vary approximately between 500 and 4,800 revolutions per minute, adjusting electronically according to the selected control mode and the hydraulic needs of the circuit.

Electrical consumption between 4 and 75 watts

The pump's electrical consumption varies depending on the operating point. Wilo specifies a minimum consumption of 4 watts and a maximum consumption of 75 watts.

The motor rated power is 58 watts. Thanks to electronic control, the pump can reduce its consumption when the installation requires less flow or pressure.

Energy efficiency index equal to or lower than 0.23

The Yonos PICO 25/1-8 has an energy efficiency index equal to or lower than 0.23, placing it within the category of high-efficiency electronic circulator pumps.

This feature, combined with automatic power regulation, helps reduce consumption compared with conventional circulator pumps that operate permanently at a fixed speed.

Fluid temperature between -10 and 95 degrees Celsius

The pump accepts a fluid temperature between -10 and 95 degrees Celsius, so it can be used in different heating and air conditioning applications within this range.

The permitted ambient temperature is between -10 and 40 degrees Celsius.

Maximum operating pressure of 10 bar

The maximum pressure allowed by the pump is 10 bar. The circuit must be sized so that the maximum pressure of the installation always remains within this limit.

Wilo also specifies a minimum inlet height of 0.5 meters with the fluid at 50 degrees Celsius and 3 meters at 95 degrees Celsius, values that must be considered to avoid unsuitable hydraulic conditions at the pump suction.

DN 25 connection and 180-millimeter installation length

The pump has a G 1 1/2 pipe connection, equivalent to an RP 1 pump connection and nominal diameter DN 25.

The distance between threads is 180 millimeters, a common size in circulator pumps of this capacity that facilitates replacement and integration in compatible installations.

Wilo electrical connector for easy installation

The unit includes a Wilo quick connector for the electrical connection. This system is designed to simplify wiring operations during installation and maintenance.

The pump also has integrated motor protection, so it does not require a separate conventional system for protection against motor blockage within the conditions specified by the manufacturer.

Durable construction for continuous operation

The hydraulic body is made of grey cast iron, while the shaft is made of stainless steel. The impeller is made of glass-fiber-reinforced plastic and the bearings are made of metal-impregnated carbon.

This combination of materials is specifically designed for the operation of a wet rotor circulator pump in heating and air conditioning systems.

IPX4D protection and class F insulation

The motor has an IPX4D protection rating and class F electrical insulation.

The pump also complies with the corresponding electromagnetic compatibility requirements and carries markings and approvals such as CE, VDE and EAC.

Compact format and reduced weight

The Wilo Yonos PICO 25/1-8 has compact dimensions that make it easy to install in technical rooms, hydraulic cabinets and other areas with limited space.

Its length is 180 millimeters, the approximate height is 102 millimeters and the width is 143 millimeters. The net weight is approximately 2 kilograms.

Technical features of the Wilo Yonos PICO 25/1-8

• Brand: Wilo.
• Range: Yonos PICO.
• Reference: 4215517.
• Model: Yonos PICO 25/1-8.
• EAN: 4048482758497.
• Product type: electronic wet rotor circulator pump.
• Application: heating and air conditioning.
• Maximum flow rate: 4.4 cubic meters per hour.
• Maximum head: 7.6 meters.
• Maximum operating pressure: 10 bar.
• Fluid temperature: between -10 and 95 degrees Celsius.
• Ambient temperature: between -10 and 40 degrees Celsius.
• Power supply: single-phase 230 volts, with 10 percent tolerance.
• Frequency: 50 or 60 hertz.
• Motor rated power: 58 watts.
• Minimum consumption: 4 watts.
• Maximum consumption: 75 watts.
• Speed: between 500 and 4,800 revolutions per minute.
• Energy efficiency index: equal to or lower than 0.23.
• Control modes: variable differential pressure, constant differential pressure and constant speed with 3 curves.
• Display: segment LED indicator.
• Display information: setpoint, current flow rate, power consumption and fault codes.
• Venting function: manual.
• Automatic unlocking: yes.
• Manual restart: yes.
• Blockage-resistant motor: yes.
• Integrated motor protection: yes.
• Electrical connection: Wilo quick connector.
• Hydraulic connection: G 1 1/2.
• Alternative connection: RP 1.
• Nominal diameter: DN 25.
• Installation length: 180 millimeters.
• Pump housing: grey cast iron.
• Impeller: glass-fiber-reinforced polypropylene.
• Shaft: stainless steel.
• Bearings: metal-impregnated carbon.
• Protection rating: IPX4D.
• Insulation class: F.
• Length: 180 millimeters.
• Height: 102 millimeters.
• Width: 143 millimeters.
• Net weight: approximately 2 kilograms.

Efficient circulation for radiators and underfloor heating

The Wilo Yonos PICO 25/1-8 combines a maximum flow rate of 4.4 cubic meters per hour and a head of up to 7.6 meters with high-efficiency electronic control. Its constant differential pressure, variable differential pressure and constant speed modes allow operation to be adapted to different heating and air conditioning installations.

The LED display, green button, flow and consumption display, venting function, automatic unlocking and Wilo quick connector simplify both commissioning and daily use, offering an efficient and versatile solution for water circulation in building hydraulic systems.