Grundfos ALPHA1 GO 25-40 130 Circulating Pump

The ALPHA1 GO 25-40 130 circulator pump is a high-efficiency solution designed for heating and air conditioning systems in residential environments. Its integrated electronics and built-in frequency converter enable optimized operation, reducing energy consumption without compromising hydraulic performance.

This model makes replacing old pumps easy thanks to the ability to check compatibility and replicate pump curves via the support app, streamlining commissioning and avoiding complex installation adjustments.

Main Applications

• Radiator heating systems
• Underfloor heating installations
• Air conditioning and climate control systems
• Replacement of existing circulator pumps

Hydraulic Performance

• Nominal flow rate: 1.65 m³/h
• Nominal head: 1.89 m
• Maximum head: 4 m
• Maximum working pressure: 10 bar

Control and Energy Efficiency

• Integrated frequency converter
• Energy Efficiency Index (EEI): 0.20
• Power consumption adapted to system demand
• Quiet and stable operation

Materials and Construction

• Hydraulic body made of EN-GJL-150 cast iron
• Housing compliant with EN 1561 / ASTM A48-150B
• Impeller made of PES composite reinforced with fiberglass
• Compact and robust design for long durability

Installation and Compatibility

• Hydraulic connection: 1 1/2 inches
• Connection standard: ISO 228-1
• Nominal connection pressure: PN 10
• Connection length: 130 mm
• Ambient temperature range: 0 to 55 °C

Liquid Data

• Pumped liquid: water
• Liquid temperature range: 2 to 110 °C
• Reference temperature: 20 °C

Electrical Data

• Minimum power consumption (P1): 4 W
• Maximum power consumption (P1): 27 W
• Power supply: 1 x 220-240 V
• Network frequency: 50 / 60 Hz
• Current consumption: from 0.06 to 0.30 A
• Protection rating: IP44
• Insulation class: F
• Integrated electronic thermal protection

Weight and Dimensions

• Net weight: 1.82 kg
• Gross weight: 2.00 kg
• Port-to-port length: 130 mm

The ALPHA1 GO 25-40 130 is an efficient, reliable, and easy-to-integrate circulator pump, ideal for professionals seeking a modern solution for new installations or quick replacements with very low energy consumption.