Circulation pump Grundfos ALPHA1 25-40 180, head 4 m, flow 1.65m³/h

Circulation pump Grundfos ALPHA1 25-40 180 is a highly efficient solution for residential and commercial heating systems. The model features a nominal head of 1.89 m and a maximum head of 4 m (40 dm), as well as a nominal flow rate of 1.65 m³/h, making it an ideal choice for standard heating installations with radiators, underfloor heating, and mixed systems.

The pump is designed with an electronically commutated motor (ECM), which ensures low energy consumption and long service life. Its energy efficiency class is EEI ≤ 0.20 – an indicator of exceptionally high efficiency and economy.

ALPHA1 25-40 180 is equipped with intelligent control and offers three main operating modes: constant pressure, proportional pressure, and fixed curve, with each mode providing three individual speed settings for precise adjustment according to the installation type.

Installation is simplified thanks to the tool-free quick connector, which ensures easy electrical connection. Dry-running protection and the automatic air venting function guarantee quiet and reliable operation while protecting the system from damage.

The model is distinguished by stable start-up, which reduces the risk of blockage caused by contamination, magnetite, or limescale buildup. In the event of difficulty, the motor automatically applies maximum torque to restore operation.

The pump housing is made of high-quality cast iron EN 1561 EN-GJL-150, while the impeller is made of PES composite with 30% fiberglass. The ceramic shaft and bearings ensure minimal wear and extended service life, while preventing noise and vibrations.

Diagnostic symbols are located on the front panel, allowing quick and easy detection of errors and malfunctions.

Technical parameters:

• Nominal flow rate: 1.65 m³/h
• Nominal head: 1.89 m
• Maximum head: 4 m (40 dm)
• Pumped liquid: Water
• Recommended temperature: 60°C
• Density: 983.2 kg/m³
• Housing: Cast iron EN-GJL-150 / ASTM A48-150B
• Impeller: PES composite + 30% GF
• Shaft and bearings: CeramicConnection size: G 1 1/2"
• Port-to-port length: 180 mm
• Maximum operating pressure: 10 bar (PN10)
• Current consumption: 0.06 – 0.3 A
• Protection class: IP44
• Insulation class: F
• Thermal protection: Electronic
• Energy Efficiency Index (EEI): ≤ 0.20
• Net weight: 1.95 kg
• Gross weight: 2.14 kg
• Transport volume: 0.004 m³
• Model: D
• Approvals: CE, VDE