Grundfos ALPHA2 GO 25-60 180 Circulating Pump

The Grundfos ALPHA2 GO 25-60 180 circulator pump, reference 93074216, is a high-efficiency electronic circulator designed to move water in heating and cooling systems. It offers a maximum head of 6 meters, a nominal flow rate of 1.9 m³/h, modulating electrical consumption of just 3 to 37 W, G 1½" connections, and an installation length of 180 mm.

The ALPHA2 GO combines advanced hydraulic regulation with direct connectivity via Grundfos GO, allowing you to configure the pump, use AUTOADAPT, perform hydraulic balancing, consult historical data, diagnose issues, and simplify the replacement of existing circulators. It is especially suitable for systems with radiators, underfloor heating, and other closed heating and cooling circuits.

Circulator pump with a maximum head of 6 meters

The Grundfos ALPHA2 GO 25-60 180 provides a maximum head of 6 m. For reference 93074216, Grundfos specifies a nominal point of 1.9 m³/h flow and 3.26 m head.

The actual operating point will depend on the pressure losses of the installation, the required flow rate, and the selected control mode.

Thanks to the electronically commutated motor and the integrated frequency converter, the pump can adapt its operation instead of maintaining a fixed speed regardless of circuit demand.

Intelligent AUTOADAPT control

The ALPHA2 GO incorporates AUTOADAPT technology, which allows the pump itself to automatically optimize the setpoint according to the needs of the installation.

AUTOADAPT is available with proportional pressure and constant pressure control and reduces the need to manually select a specific operating point.

Grundfos recommends its use in both radiator systems and underfloor heating installations.

Different control modes

The pump allows you to select different control strategies to adapt to the hydraulic behavior of each system:

• Proportional pressure: adjusts differential pressure according to the required flow, especially useful in radiator installations with thermostatic valves.
• Constant pressure: maintains a stable differential pressure even when flow varies, a common solution in underfloor heating installations.
• Constant flow: regulates the pump to maintain the configured flow rate.
• Constant curve: allows operation according to a fixed operating curve.
• AUTOADAPT: automatically adjusts the operating point according to demand.

The setpoints can be adapted to the specific characteristics of the installation using Grundfos GO.

PWM input for external control

The ALPHA2 GO features a PWM input, allowing precise control of the circulator speed via a compatible external signal.

This is especially useful when the pump must be integrated into systems where a boiler, heat pump, or other external controller directly manages the circulator operation.

Direct connection with Grundfos GO

The ALPHA2 GO incorporates Bluetooth to connect directly with the Grundfos GO app from a compatible mobile device.

This connectivity provides access to advanced digital installation, configuration, and diagnostic functions without the need for additional communication interfaces.

Available options through Grundfos GO include:

• Guided setup.
• Control mode selection.
• Setpoint calculation.
• AUTOADAPT configuration.
• Hydraulic balancing.
• Operating data overview.
• Event, warning, and alarm log.
• Historical data display.
• Circulator replacement assistance.

Guided installation setup

The guided setup function in Grundfos GO makes commissioning easier in new installations.

The app requests information about the system and helps select the appropriate control mode and setpoint. When suitable, the recommended configuration can use AUTOADAPT so the pump automatically optimizes its operation.

Also designed to replace existing circulators

The ALPHA2 GO range is specially designed to facilitate the replacement of old or integrated circulator pumps.

Using Grundfos GO, the installer can search for the existing model and check the appropriate alternative. The ALPHA2 GO can even be configured to reproduce compatible pump curves being replaced.

Grundfos especially highlights its ability to replace different standalone circulators and integrated models from the UPM3 and UPM4 families.

Air detection and venting function

The ALPHA2 GO includes air detection. When the system detects air around the impeller, the circulator can generate pulsed operation to help move it toward the nearest venting element.

This function makes commissioning easier and can help identify circulation problems related to the presence of air.

This function does not replace the need for proper venting components in the hydraulic circuit.

Dry-run protection

The pump features dry-run protection, designed to protect the unit if there is not enough liquid around the rotor.

If an abnormal condition is detected, the electronics can stop or limit operation and generate the corresponding indication to make diagnosis easier.

Robust startup against blockages

The Robust Startup function is designed to reduce blockage problems caused by dirt, magnetite, or limescale deposits.

If the rotor encounters resistance, the motor makes repeated start attempts using high torque to try to restore movement.

This feature is especially useful after long periods of system inactivity.

Ceramic shaft and bearings

Grundfos uses a ceramic shaft and bearings in the ALPHA2 GO. These components experience reduced wear during operation and help limit the increase in clearance that could generate noise over time.

Historical data and diagnostics

Through Grundfos GO, it is possible to consult operating information to facilitate system analysis and diagnostics.

The app provides access to event history and trends related to parameters such as:

• Flow rate.
• Head.
• Estimated fluid temperature.
• Operating cycle duration.

These data help the professional analyze the installation behavior and locate possible anomalies.

Hydraulic balancing via Grundfos GO

The ALPHA2 GO includes hydraulic balancing tools through the Grundfos GO app.

Proper balancing helps distribute flow correctly between the different emitters and circuits, avoiding imbalances that can cause rooms to have different temperatures or unnecessary energy consumption.

High energy efficiency with EEI 0.18

Reference 93074216 has an energy efficiency index EEI of 0.18.

Its absorbed electrical power varies between just 3 and 37 W, depending on hydraulic demand and operating point.

Electronic control allows consumption to adapt to the installation and avoids permanently maintaining maximum power when the circuit does not need it.

Single-phase 220-240 V power supply

The Grundfos ALPHA2 GO 25-60 180 operates with a single-phase 220-240 V, 50/60 Hz power supply.

Current consumption is approximately between 0.04 and 0.40 A.

Thermal protection is electronically managed and the motor has insulation class F.

Tool-free electrical connector

The pump includes an installation connector designed for tool-free electrical connection, making assembly easier and reducing the time needed during commissioning or replacement.

Installation length of 180 mm

The 180 designation of this circulator indicates a distance between connections of 180 mm.

This measurement is common in heating circulation pumps and is especially important when replacing an existing pump, as it must be checked together with the connection thread.

G 1½" connections

The Grundfos 93074216 includes G 1½" threaded connections in accordance with ISO 228-1.

The pressure rating of the connections is PN 10.

Maximum operating pressure of 10 bar

The pump is designed for a maximum operating pressure of 10 bar.

The installation must be designed and protected to ensure this value is not exceeded during normal system operation.

Water temperature from 2 to 110 °C

The specific documentation for reference 93074216 specifies a liquid temperature range of 2 to 110 °C.

The permitted ambient temperature around the pump is between 0 and 55 °C.

These conditions make it suitable for different closed heating and cooling systems as long as the fluid and the rest of the components are compatible.

Cast iron pump housing

The hydraulic housing is made of EN-GJL-150 cast iron.

The impeller uses reinforced composite materials, specifically PES with glass fiber and reinforced PESU, suitable for the internal operation of the circulator.

This version is primarily intended for closed heating and cooling circuits.

IP44 protection

The ALPHA2 GO 25-60 180 has an IP44 protection rating.

During installation, the correct mounting position, permitted ambient temperatures, and the electrical conditions specified by Grundfos must be observed.

Technical specifications of Grundfos 93074216

• Brand: Grundfos.
• Range: ALPHA2 GO.
• Model: ALPHA2 GO 25-60 180.
• Reference: 93074216.
• Type: high-efficiency electronic circulator pump.
• Application: heating and cooling.
• Nominal flow rate: 1.9 m³/h.
• Nominal head: 3.26 m.
• Maximum head: 6 m.
• Installation length: 180 mm.
• Connection type: G.
• Connection size: G 1½".
• Connection standard: ISO 228-1.
• Nominal pressure: PN 10.
• Maximum operating pressure: 10 bar.
• Liquid temperature: 2-110 °C.
• Ambient temperature: 0-55 °C.
• Power supply: 1 x 220-240 V.
• Frequency: 50/60 Hz.
• Minimum absorbed power: 3 W.
• Maximum absorbed power: 37 W.
• Current consumption: 0.04-0.40 A.
• Energy efficiency index EEI: 0.18.
• Frequency converter: integrated.
• Thermal protection: electronic.
• Protection rating: IP44.
• Insulation class: F.
• Housing material: EN-GJL-150 cast iron.
• Impeller material: reinforced composite.
• Proportional pressure: yes.
• Constant pressure: yes.
• Constant flow: yes.
• Constant curve: yes.
• AUTOADAPT: yes.
• PWM input: yes.
• Bluetooth: integrated.
• Compatible with Grundfos GO: yes.
• Guided setup: yes.
• Air detection and venting: yes.
• Dry-run protection: yes.
• Robust startup: yes.
• Hydraulic balancing: yes, via Grundfos GO.
• Event and trend logging: yes.
• Approvals: CE and VDE.
• Net weight: 1.94 kg.
• Gross weight: 2.16 kg.
• EAN: 5715467404432.

Smart circulator for radiators and underfloor heating

The Grundfos ALPHA2 GO 25-60 180 combines a maximum head of 6 meters with reduced consumption of 3 to 37 W, advanced electronic control, and direct connectivity with Grundfos GO.

Its proportional pressure, constant pressure, constant flow, and constant curve modes allow it to adapt to different circuits, while AUTOADAPT simplifies operating optimization in radiator and underfloor heating installations.

Functions such as air detection, dry-run protection, robust startup, hydraulic balancing, and app-based diagnostics provide additional tools for both new installations and the replacement and modernization of existing circulator pumps.