Grundfos ALPHA1 GO 25-80 180 Circulator Pump

The Grundfos ALPHA1 GO 25-80 180 circulator pump, reference 93074179, is a high-efficiency electronic circulator designed for heating and air-conditioning installations. It offers a maximum head of 8 meters, a nominal flow rate of 2.43 m³/h, modulating electrical power from 4 to 60 W, G 1½" threaded connections, and an installation length of 180 mm.

The ALPHA1 GO is especially suited both for new installations and for the replacement of standalone circulators and integrated UPS pumps. It features proportional pressure, constant pressure and constant curve modes, as well as an auto-venting function, dry-run protection and robust start-up to ensure reliable commissioning.

Circulator pump with a maximum head of 8 meters

The Grundfos ALPHA1 GO 25-80 180 reaches a maximum head of 8 m, providing suitable performance for installations that require a higher available pressure than the 25-40 or 25-60 versions.

The nominal operating point indicated in the specific datasheet for this reference is:

• Nominal flow rate: 2.43 m³/h.
• Nominal head: 3.76 m.
• Maximum head: 8 m.

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

Three main control modes

The ALPHA1 GO allows its operation to be adapted to different hydraulic systems through several control modes:

• Proportional pressure: especially recommended for radiator systems with thermostatic valves.
• Constant pressure: suitable for installations such as underfloor heating circuits.
• Constant curve: maintains operation according to a fixed curve regardless of demand variations.

Each of these modes offers different adjustment levels, allowing the circulator to be adapted to the specific needs of the installation.

Proportional pressure for radiator systems

In proportional pressure mode, the pump reduces or increases differential pressure as the flow demanded by the system changes.

This behavior is especially suitable for radiator installations with thermostatic valves, where the closing of some valves continuously changes the hydraulic resistance of the circuit.

Constant pressure for underfloor heating

In constant pressure mode, the ALPHA1 GO tries to maintain a stable differential pressure even if the flow rate varies.

Grundfos especially recommends this type of control for underfloor heating installations and other circuits where it is desirable to maintain a relatively constant pressure.

Constant curve

The constant curve mode allows the pump to operate with behavior similar to a traditional fixed-speed circulator, selecting one of the available levels.

This option is especially useful in certain replacements where it is necessary to reproduce the behavior of an existing pump.

Especially designed for circulator replacement

One of the main goals of the ALPHA GO range is to simplify the replacement of previously installed pumps.

Grundfos specifically identifies the ALPHA1 GO 25-80 180 as a solution for replacing most standalone circulator pumps and many integrated UPS circulators in boilers and other equipment.

The Grundfos GO app includes a replacement tool that allows you to search among thousands of circulator models and obtain a recommended setting for the new pump.

Advanced mode for replicating settings

The ALPHA1 GO includes an advanced replacement mode that allows specific curves to be selected following the guidance provided by the Grundfos GO app.

In this way, the installer can approximately reproduce the hydraulic configuration of a compatible previous circulator.

Unlike the ALPHA2 GO, the ALPHA1 GO does not connect directly to the app via Bluetooth. The app assists in the selection and shows the setting that must be entered manually on the pump panel.

Auto-venting function

The ALPHA1 GO incorporates an auto-venting function that helps expel air present inside the pump during operation.

This function makes commissioning easier and reduces the need to intervene manually on the circulator, although the complete circuit must still have the appropriate venting devices.

Dry-run protection

The pump includes dry-run protection.

When it detects that there is an insufficient amount of liquid for safe operation, the electronics protect the circulator against possible damage caused by running without water.

Robust start-up

The Robust Start-Up function uses high starting torque to help initiate rotor movement even under demanding conditions.

This feature is especially useful after long periods of inactivity or when small deposits initially make movement difficult.

Shaft and bearings designed to reduce blockages

The ALPHA GO range uses a shaft and bearing assembly developed to reduce the risk of blockage and deposit build-up.

If the pump encounters resistance during start-up, the motor makes new attempts using the maximum available torque to restore operation.

High energy efficiency with EEI 0.20

Reference 93074179 has an energy efficiency index EEI of 0.20.

Its high-efficiency motor incorporates an integrated frequency converter and adapts electrical consumption to operating needs.

• Minimum absorbed power P1: 4 W.
• Maximum absorbed power P1: 60 W.

This modulation helps reduce consumption compared with older fixed-speed circulators when the installation does not need to operate at full capacity.

Single-phase 220-240 V power supply

The Grundfos ALPHA1 GO 25-80 180 operates with:

• Rated voltage: 1 x 220-240 V.
• Frequency: 50/60 Hz.
• Minimum current: 0.06 A.
• Maximum current: 0.60 A.

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

Installation length of 180 mm

The 180 designation corresponds to a 180 mm connection distance, a common size in circulators used in domestic installations and small heating systems.

This length should always be checked before replacing an existing pump.

G 1½" hydraulic connections

Reference 93074179 has G 1½" threaded connections according to ISO 228-1.

• Connection type: G.
• Size: G 1½".
• Mounting length: 180 mm.
• Connection nominal pressure: PN 10.

Maximum operating pressure of 10 bar

The ALPHA1 GO 25-80 180 supports a maximum operating pressure of 10 bar.

The actual system pressure must remain within the limits permitted by all components installed in the circuit.

Liquid temperature from -10 to 110 °C

The specific datasheet for reference 93074179 indicates a pumped liquid temperature range of -10 to +110 °C.

The permitted ambient temperature during operation is between 0 and 55 °C.

These features make it suitable for different closed heating and air-conditioning circuits, provided the fluid is compatible with the pump materials.

Cast iron pump housing

The hydraulic housing is made of EN-GJL-150 cast iron, a common material in circulators intended for closed heating circuits.

The impeller is made of PES composite material reinforced with 30% glass fiber.

IP44 protection

The Grundfos ALPHA1 GO 25-80 180 has an IP44 protection rating.

Installation must comply with the mounting positions, electrical requirements and environmental conditions specified by Grundfos.

Front indicators and operation

The front panel allows direct selection of the control mode and operating level.

The interface is designed to simplify commissioning without the need for external equipment, especially in the usual proportional pressure, constant pressure and constant curve configurations.

Typical applications

The ALPHA1 GO 25-80 180 is especially suitable for water circulation in:

• Radiator heating systems.
• Underfloor heating installations.
• Closed heating circuits.
• HVAC hydraulic systems.
• Boiler-associated circuits.
• Compatible heat pump installations.
• Replacement of standalone circulators.
• Replacement of many integrated UPS circulators.

This cast iron version is intended for closed circuits and must not be confused with a pump specifically designed for domestic hot water recirculation.

Technical specifications of the Grundfos 93074179

• Brand: Grundfos.
• Range: ALPHA1 GO.
• Model: ALPHA1 GO 25-80 180.
• Reference: 93074179.
• EAN: 5715467404050.
• Type: high-efficiency electronic circulator pump.
• Applications: heating and air conditioning.
• Liquid specified in datasheet: water.
• Nominal flow rate: 2.43 m³/h.
• Nominal head: 3.76 m.
• Maximum head: 8 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: -10 to +110 °C.
• Ambient temperature: 0 to 55 °C.
• Power supply: 1 x 220-240 V.
• Frequency: 50/60 Hz.
• Minimum P1 power: 4 W.
• Maximum P1 power: 60 W.
• Minimum current: 0.06 A.
• Maximum current: 0.60 A.
• Energy efficiency index EEI: 0.20.
• Frequency converter: integrated.
• Thermal protection: electronic.
• Protection rating: IP44.
• Insulation class: F.
• Housing material: EN-GJL-150 cast iron.
• Impeller material: PES composite + 30% GF.
• Proportional pressure: yes.
• Constant pressure: yes.
• Constant curve: yes.
• AUTOADAPT: no; function reserved for ALPHA2 GO.
• Auto-venting function: yes.
• Dry-run protection: yes.
• Robust start-up: yes.
• Grundfos GO replacement assistance: yes.
• Direct Bluetooth with Grundfos GO: no.
• Head orientation: 9H.
• Approvals: CE and VDE.
• Net weight: 1.97 kg.
• Gross weight: 2.17 kg.

8-meter circulator designed for installation and replacement

The Grundfos ALPHA1 GO 25-80 180 combines a maximum head of 8 meters, G 1½" connections and a standard installation length of 180 mm with electronic control and consumption of only 4 to 60 W.

Its proportional pressure, constant pressure and constant curve modes make it suitable for radiators, underfloor heating and other closed circuits, while the auto-venting function, dry-run protection and robust start-up help improve reliability during use.

Its specific focus on replacing standalone circulators and integrated UPS pumps, together with the Grundfos GO selection tool, makes the ALPHA1 GO 25-80 180 a particularly practical choice for installation and maintenance professionals.