Grundfos ALPHA SOLAR 25-75 180 Circulator Pump

The Grundfos ALPHA SOLAR 25-75 180 circulator pump is an advanced solution for solar thermal heating systems. Specifically designed for solar applications, this pump stands out for its energy efficiency, durability, and adaptability to different operating conditions. Thanks to its speed control via low-voltage PWM signal from a solar controller, it can optimise its performance to match system needs, improving efficiency and reducing energy consumption.

Optimised design for solar systems

The ALPHA SOLAR 25-75 180 is perfect for domestic heating systems using solar energy. With three constant curve modes, this pump can easily adapt to different flow and temperature demands within the system, ensuring optimal performance at all times. Its PWM signal control allows for precise speed management, resulting in enhanced energy efficiency, ensuring the pump only consumes the necessary energy.

Technical performance

The nominal flow rate of 1.85 m³/h and the maximum head of 7.5 metres (75 dm) make this pump a highly efficient option for a variety of solar applications. Its ability to handle liquids at temperatures ranging from 2 to 110 °C makes it a versatile choice suitable for extreme conditions, such as solar thermal systems. Furthermore, its maximum working pressure of 10 bar allows it to operate reliably in high-pressure systems.

High-quality and durable materials

The pump is constructed with top-quality materials. The hydraulic body is made of cast iron (EN 1561 EN-GJL-150 / ASTM A48-150B), ensuring long life and resistance to corrosion. The impeller, made from glass fibre-reinforced composite (PES 30% GF + PESU-GF20%), is lightweight and robust, ensuring efficient operation for years.

Key technical data:

• Nominal flow rate: 1.85 m³/h
• Nominal head: 3.285 m
• Maximum head: 7.5 m
• Liquid temperature range: 2 to 110 °C
• Maximum working pressure: 10 bar
• Minimum input power: 2 W
• Maximum input power: 45 W
• Nominal voltage: 230 V
• Current consumption: 0.04 - 0.48 A

Easy and versatile installation

With a connection size of 1 1/2 inches and a port-to-port length of 180 mm, the ALPHA SOLAR 25-75 180 is easy to install in most solar systems. Additionally, its compact and lightweight design, with a net weight of only 2.18 kg, facilitates handling and integration into new or existing systems.

The ambient temperature range of 2 to 70 °C ensures the pump can operate in various climatic conditions, both indoors and outdoors, offering a versatile solution for water circulation in solar systems.

Outstanding energy efficiency

The energy efficiency of the ALPHA SOLAR is one of its strong points, with an energy efficiency index (EEI) of 0.20, demonstrating its ability to operate economically and environmentally friendly. This translates into lower electricity consumption, thus reducing operational costs and the carbon footprint of the solar heating system.

Certifications and approvals

This circulator pump complies with all international safety and quality standards, holding CE, VDE, and EAC approvals, ensuring a high level of performance and reliability in use. Additionally, it has an IPX4D protection rating, making it resistant to water splashes, and an insulation class F, ensuring its reliability in high-temperature conditions.

Additional specifications:

• Net weight: 2.18 kg
• Gross weight: 2.37 kg
• Transport volume: 0.004 m³
• Connection box position: 9H

The Grundfos ALPHA SOLAR 25-75 180 is the ideal choice for solar heating systems, combining energy efficiency, advanced control, and high-quality materials. Its easy installation, along with its ability to operate in a wide range of temperatures and conditions, makes it a reliable and durable solution for water circulation control in solar thermal applications.