Circulation pump GRUNDFOS ALPHA 1L 25-60 180 mm 99160584 GRUNDFOS

The GRUNDFOS ALPHA 1L 25-60 circulation pump is engineered for domestic and small commercial heating systems. Its compact inline housing and 180 mm length make it suitable for retrofit and new installations where space is limited. The pump provides a maximum head of 6 meters and a nominal flow up to 2.5 m³/h, delivering stable water circulation for radiators, underfloor heating manifolds and closed-loop heating circuits. Designed for quiet operation, the unit integrates motor protection for reliable continuous service and reduced maintenance needs.

Advantages

The ALPHA 1L 25-60 combines a small footprint with efficient hydraulic performance, helping to lower electricity consumption in circulating systems. Its quiet motor and vibration-minimised design reduce noise in occupied spaces. Built-in motor protection and robust construction contribute to long service life and dependable operation under normal heating system conditions. The pump’s standardised connections and compact length simplify installation and replacement.

Suitable for

• Domestic radiator heating systems
• Underfloor heating circuits in small to medium installations
• Boiler loop and primary/secondary circulation duties
• Replacement of older inline circulation pumps with limited installation space

Key specifications

• Maximum head: 6 m
• Maximum flow: up to 2.5 m³/h
• Pump length: 180 mm (compact inline design)
• Application: sealed heating systems
• Operation: low-noise hydraulic design
• Protection: integrated motor protection

How to use

Install the pump in the supply or return line of the heating circuit following system flow direction and local plumbing codes. Ensure electrical connection is performed by a qualified electrician and verify compatibility with the system voltage and power supply. Bleed the heating circuit after installation to remove trapped air and check for leaks. Set pump controls according to the system’s hydraulic requirements; observe manufacturer guidance for start-up and commissioning to achieve correct flow and head conditions.

Usage recommendations

For optimal performance, install the pump on a straight section of pipe with accessible shut-off valves for future servicing. Maintain water quality within the heating system’s specifications to prevent corrosion and blockage. Schedule periodic checks of electrical connections, mounting integrity and operational noise level; replace or service the pump if performance declines.