Wilo Yonos PICO 25/1-6 Circulating Pump

The Wilo Yonos PICO 25/1-6 circulator pump, reference 4215515, is a high-efficiency electronic wet rotor pump designed for water circulation in heating and air conditioning systems. It offers a maximum flow rate of 3.6 cubic meters per hour, a maximum head of 6 meters, and a mounting length of 180 millimeters.

Equipped with an ECM synchronous motor and integrated electronic control, it adapts its operation to the actual hydraulic needs of the installation. It features variable differential pressure control, constant differential pressure, and constant speed with 3 curves, so it can be configured for both radiator circuits and underfloor heating.

Wilo Yonos PICO 25/1-6 electronic circulator pump

The Wilo Yonos PICO is a maintenance-free wet rotor circulator pump with threaded connection and continuous electronic differential pressure control.

Its electronics control the motor speed to adjust operation to the required flow and pressure, reducing consumption when the system does not need to run at full power.

Maximum flow rate of 3.6 cubic meters per hour

Reference 4215515 provides a maximum flow rate of 3.6 cubic meters per hour. The actual flow rate will depend on the hydraulic resistance of the circuit, the selected head, and the configured control mode.

This capacity makes it suitable for numerous domestic heating and air conditioning circuits and small buildings, provided the required operating point falls within the pump’s characteristic curve.

Maximum head of 6 meters

The Wilo Yonos PICO 25/1-6 reaches a maximum head of 6 meters.

This performance makes it possible to compensate for pressure losses caused by pipes, valves, emitters, and other components in the hydraulic circuit.

Three control modes

The pump offers different control strategies to adapt to the behavior of each installation:

• Variable differential pressure: reduces differential pressure when the requested flow decreases.
• Constant differential pressure: keeps the selected differential pressure value practically constant.
• Constant speed: allows selection between 3 fixed-speed operating curves.

Choosing the correct control mode helps achieve efficient and stable system operation.

Suitable for radiators and underfloor heating

Wilo specifically recommends the Yonos PICO for radiator and underfloor heating systems.

Variable differential pressure control is especially suitable for many circuits with thermostatic valves, while constant differential pressure can be used in numerous underfloor heating systems.

LED display with operating information

The pump includes a segment LED indicator that makes configuration and monitoring easy directly from the front panel.

The display allows you to check:

• Selected setpoint.
• Actual flow rate.
• Current power consumption.
• Fault codes.

This information simplifies both commissioning and routine operating checks.

Control via Wilo green button

The distinctive Wilo green button allows you to select the control mode and adjust the pump’s main parameters.

The combination of the rotary control and LED display simplifies adjustment even during replacement or maintenance work.

Manual venting function

The Yonos PICO 25/1-6 includes a manual venting function designed to remove air accumulated in the motor compartment.

This function is especially useful during first commissioning or after filling, draining, or maintenance work on the circuit.

Automatic unlocking and manual restart

The motor is block-resistant and includes an automatic unlocking function.

It also features manual restart and integrated motor protection, functions that simplify commissioning and maintenance of the unit.

Synchronous motor with ECM technology

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

Its speed can vary from approximately 700 to 4,200 revolutions per minute, adapting to the selected control mode and the hydraulic needs of the circuit.

Electrical consumption between 4 and 40 watts

Wilo specifies a minimum electrical consumption of 4 watts and a maximum of 40 watts.

The motor rated power is 30 watts. Electronic control makes it possible to reduce consumption when system demand decreases.

Energy efficiency index equal to or lower than 0.20

The Wilo Yonos PICO 25/1-6 has an energy efficiency index equal to or lower than 0.20, a value that Wilo identifies as a benchmark for high-efficiency circulator pumps.

The ECM motor and automatic control help reduce energy consumption compared with conventional pumps that run permanently at a fixed speed.

Single-phase 230-volt power supply

The pump operates on a single-phase 230-volt power supply, with a 10 percent tolerance, and is compatible with 50 or 60 hertz frequencies.

Electrical connection is made via the Wilo quick connector, designed to simplify wiring during installation and maintenance operations.

Fluid temperature between -10 and 95 degrees Celsius

The permitted fluid temperature range is between -10 and 95 degrees Celsius.

The permissible ambient temperature during operation is between -10 and 40 degrees Celsius.

Maximum operating pressure of 10 bar

The pump supports a maximum operating pressure of 10 bar.

Wilo also specifies a minimum inlet height of 0.5 meters with fluid at 50 degrees Celsius and 3 meters at 95 degrees Celsius.

DN 25 connection and 180-millimeter mounting length

The Wilo Yonos PICO 25/1-6 uses threaded connections compatible with many existing heating installations.

• Pipe connection: G 1 1/2.
• Alternative connection: RP 1.
• Nominal diameter: DN 25.
• Length between threads: 180 millimeters.

The 180-millimeter mounting length distinguishes this reference from the Yonos PICO 25/1-6-130 version, intended for installations with a shorter connection distance.

Durable materials for hydraulic circuits

Wilo uses different materials adapted to continuous operation in heating and air conditioning systems:

• Pump housing: grey cast iron.
• Impeller: polypropylene reinforced with 40 percent glass fiber.
• Shaft: stainless steel.
• Bearings: metal-impregnated carbon.

Its wet rotor construction eliminates the need for conventional maintenance of the rotor-bearing assembly within the conditions specified by the manufacturer.

Integrated particle filter

The standard equipment includes a particle filter, integrated as part of the pump design.

This element helps ensure reliable operation of the internal components during service.

IPX4D protection and class F insulation

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

The pump also complies with the electromagnetic compatibility requirements specified by Wilo and carries CE, VDE, and EAC approvals and markings.

Dimensions and weight

The Yonos PICO 25/1-6 has a compact format to facilitate integration into technical rooms and heating circuits.

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

Technical features of the Wilo Yonos PICO 25/1-6

• Brand: Wilo.
• Range: Yonos PICO.
• Reference: 4215515.
• Model: Yonos PICO 25/1-6.
• EAN: 4048482758473.
• Product type: electronic wet rotor circulator pump.
• Application: heating and air conditioning.
• Maximum flow rate: 3.6 cubic meters per hour.
• Maximum head: 6 meters.
• Maximum operating pressure: 10 bar.
• Minimum fluid temperature: -10 degrees Celsius.
• Maximum fluid temperature: 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: 30 watts.
• Minimum consumption: 4 watts.
• Maximum consumption: 40 watts.
• Minimum speed: 700 revolutions per minute.
• Maximum speed: 4,200 revolutions per minute.
• Energy efficiency index: equal to or lower than 0.20.
• Control modes: variable differential pressure, constant differential pressure, and constant speed with 3 curves.
• Display: segment LED indicator.
• Display information: setpoint, actual flow rate, power consumption, and fault codes.
• Venting function: manual.
• Automatic unlocking: yes.
• Manual restart: yes.
• Integrated motor protection: yes.
• Block-resistant motor: yes.
• Particle filter: yes.
• Electrical connection: Wilo connector.
• Hydraulic connection: G 1 1/2.
• Alternative connection: RP 1.
• Nominal diameter: DN 25.
• Mounting length: 180 millimeters.
• 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: 131 millimeters.
• Approximate net weight: 1.8 kilograms.
• Approvals and markings: CE, VDE, and EAC.

Efficient circulation for radiators and underfloor heating

The Wilo Yonos PICO 25/1-6 combines a maximum flow rate of 3.6 cubic meters per hour, 6 meters of head, and electronic control in a compact and efficient pump for heating and air conditioning systems.

Its ECM motor, consumption of only 4 to 40 watts, LED display, three control modes, venting function, automatic unlocking, and Wilo quick connector make installation, adjustment, and maintenance of the hydraulic circuit easier.