Wilo Yonos PICO 25/1-4 Circulating Pump

The Wilo Yonos PICO 25/1-4 circulator pump, reference 4215513, is a high-efficiency wet-rotor pump with electronic control, designed for heating and air-conditioning installations. It offers a maximum flow rate of 2.7 cubic meters per hour and a maximum head of 4.3 meters, combining automatic regulation, low power consumption, and a compact design.

Equipped with an ECM technology synchronous motor and integrated electronics, it allows selection of variable differential pressure, constant differential pressure, or three constant-speed curves. Its LED display shows the setpoint value, actual flow rate, electrical consumption, and fault codes, making both initial setup and system monitoring easier.

Wilo Yonos PICO 25/1-4 electronic circulator pump

The Wilo Yonos PICO is designed as a maintenance-free wet-rotor circulator pump. The unit incorporates a blockage-resistant motor and continuous electronic control to adapt pump operation to the hydraulic needs of the circuit.

This technology makes it suitable for different heating and air-conditioning configurations, including radiator systems and underfloor heating systems.

Maximum flow rate of 2.7 cubic meters per hour

Reference 4215513 provides the following maximum hydraulic performance:

• Maximum flow rate: 2.7 cubic meters per hour.
• Maximum head: 4.3 meters.
• Maximum operating pressure: 10 bar.

The actual operating point will depend on pressure losses and the flow rate required by the installation.

Three control modes

The pump allows different operating modes to be selected to suit the type of hydraulic circuit:

• Δp-v: control by variable differential pressure.
• Δp-c: control by constant differential pressure.
• Constant speed: three selectable speeds or operating curves.

Variable differential pressure is especially suitable for certain radiator installations with varying flow, while constant differential pressure can be used in applications where a stable pressure is required, such as certain underfloor heating circuits.

LED display with operating information

The Yonos PICO 25/1-4 incorporates a segmented LED indicator that makes pump configuration and monitoring easier.

The display shows:

• Selected setpoint value.
• Actual flow rate.
• Current power consumption.
• Fault codes.
• Manual reset or venting function activation.

Adjustment is carried out using the characteristic Wilo green button, simplifying commissioning and selection of the control mode.

Power consumption of only 4 to 20 watts

Thanks to the ECM technology motor and integrated electronic control, the pump adapts its consumption to the required operating point.

• Minimum P1 consumption: 4 watts.
• Maximum P1 consumption: 20 watts.
• Rated power P2: 15 watts.
• Energy Efficiency Index (EEI): equal to or less than 0.18.

The low energy efficiency index places this pump in the high-efficiency circulator category.

Synchronous motor with ECM technology

The Wilo Yonos PICO uses a blockage-resistant synchronous motor with ECM technology and integrated electronic power control.

• Power supply: single-phase 230 volts, with ±10% tolerance.
• Frequency: 50/60 hertz.
• Minimum speed: 700 revolutions per minute.
• Maximum speed: 3,400 revolutions per minute.
• Insulation class: F.
• Protection rating: IPX4D.

The pump includes motor protection and a blockage-resistant design to improve reliability during operation.

Automatic unlocking function

The Yonos PICO features an automatic unlocking function. This function helps restore operation when the rotor becomes blocked after a long period of inactivity or due to certain circuit conditions.

Manual venting function

The pump incorporates a manual venting function designed to help remove air accumulated in the motor compartment during commissioning or after maintenance work on the system.

It also includes a manual reset function accessible from the pump’s own control elements.

Integrated particle filter

Wilo specifies a particle filter as part of the pump equipment for this reference.

This element is part of the design intended to protect the internal operation of the circulator against certain particles present in the fluid.

Fluid temperature from -10 to 95 degrees Celsius

The pump supports a wide fluid temperature range:

• Minimum fluid temperature: -10 degrees Celsius.
• Maximum fluid temperature: 95 degrees Celsius.
• Minimum ambient temperature: -10 degrees Celsius.
• Maximum ambient temperature: 40 degrees Celsius.

These features make the circulator suitable for both heating systems and certain air-conditioning installations, provided the fluid properties are compatible with the pump materials.

Maximum operating pressure of 10 bar

The Yonos PICO 25/1-4 is designed to operate with a maximum service pressure of 10 bar.

Wilo also specifies the following minimum inlet heads to avoid unfavorable hydraulic conditions:

• At 50 degrees Celsius: 0.5 meters.
• At 95 degrees Celsius: 3 meters.

DN 25 connection and 180 mm installation length

The pump uses standard threaded connections to facilitate integration into hydraulic circuits:

• Nominal diameter: DN 25.
• Pump connection: G 1½.
• Alternative connection designation: Rp 1.
• Connection length: 180 millimeters.

These dimensions make reference 4215513 suitable for replacements and new installations requiring a DN 25 circulator with a 180 mm installation distance.

Wilo electrical connector

The electrical connection is made via the Wilo quick connector, designed to simplify wiring during installation and reduce the time needed for the pump’s electrical setup.

Construction materials

The pump combines durable materials adapted for continuous operation in heating and air-conditioning circuits:

• Pump housing: cast iron.
• Impeller: polypropylene reinforced with 40% glass fiber, PP-GF40.
• Shaft: stainless steel.
• Bearings: metal-impregnated carbon.

Compact dimensions

The Wilo Yonos PICO 25/1-4 features a compact design that makes it easy to integrate into installations with limited space.

• Length: 180 millimeters.
• Height: 102 millimeters.
• Width: 131 millimeters.
• Approximate net weight: 1.8 kilograms.

Applications in heating and air conditioning

The pump is designed for water circulation in heating and air-conditioning systems. Its different control modes allow it to be adapted to various hydraulic configurations.

Typical applications include:

• Radiator heating systems.
• Underfloor heating installations.
• Closed heating circuits.
• Air-conditioning systems compatible with the pump’s operating conditions.
• Replacement of older circulator pumps with high-efficiency electronic models.

Technical features of the Wilo Yonos PICO 25/1-4 4215513

• Brand: Wilo.
• Series: Yonos PICO.
• Reference: 4215513.
• Model: Yonos PICO 25/1-4.
• Type: wet-rotor circulator pump.
• Control: electronic.
• Motor technology: ECM.
• Maximum flow rate: 2.7 cubic meters per hour.
• Maximum head: 4.3 meters.
• Maximum operating pressure: 10 bar.
• Δp-v control mode: yes.
• Δp-c control mode: yes.
• Constant speed: 3 levels.
• Flow indication: yes.
• Consumption indication: yes.
• Fault code indication: yes.
• Venting function: yes, manual.
• Automatic unlocking: yes.
• Manual reset: yes.
• Particle filter: yes.
• Motor protection: integrated.
• Energy Efficiency Index: equal to or less than 0.18.
• Minimum consumption: 4 watts.
• Maximum consumption: 20 watts.
• Rated power P2: 15 watts.
• Speed: 700 to 3,400 revolutions per minute.
• Power supply: 230 V single-phase ±10%.
• Frequency: 50/60 hertz.
• Protection rating: IPX4D.
• Insulation class: F.
• Fluid temperature: -10 to 95 degrees Celsius.
• Ambient temperature: -10 to 40 degrees Celsius.
• Nominal diameter: DN 25.
• Connection: G 1½.
• Installation length: 180 millimeters.
• Housing: cast iron.
• Impeller: PP-GF40.
• Shaft: stainless steel.
• Bearings: metal-impregnated carbon.
• Dimensions: 180 × 102 × 131 millimeters.
• Approximate net weight: 1.8 kilograms.
• Approvals: CE, VDE and EAC.
• EAN: 4048482758459.

High-efficiency circulator for heating and air conditioning

The Wilo Yonos PICO 25/1-4 4215513 combines a maximum flow rate of 2.7 cubic meters per hour and a maximum head of 4.3 meters with electronic control, ECM motor technology, and consumption of only 4 to 20 watts.

Its three control modes, LED display with flow and consumption readout, manual venting, automatic unlocking, Wilo quick connector, and Energy Efficiency Index equal to or less than 0.18 make this circulator a particularly practical solution for new installations and for replacing conventional pumps in heating and air-conditioning circuits.