ALPHA SOLAR circulation pump for solar heating systems 25-145 180 98989297

Circulation pump for solar systems – efficiency and reliability

The Grundfos ALPHA SOLAR 25-145 pump, with a length of 180 mm, is an advanced solution designed for use with solar thermal systems. Designed for optimal heat flow, this pump performs perfectly in both variable and constant flow installations. Its construction and operating parameters guarantee efficient operation and long-term reliability.

Construction and application

The ALPHA SOLAR pump uses an ECM (electronically commutated) motor, which translates to high energy efficiency. The ability to control it via a PWM (pulse width modulation) signal from a solar controller allows for precise adjustment of the rotational speed to the current needs of the system, maximizing solar energy harvesting. If the PWM signal is not available, the pump can operate at a constant speed, providing installation flexibility. The pump body made of cast iron GG 15 (GJL-150) provides corrosion resistance and durability, and the impeller made of composite material guarantees reliable operation.

Advantages and benefits

• High energy efficiency: Thanks to the ECM motor and PWM control, the pump minimizes electricity consumption, reducing the operating costs of the solar system. The energy efficiency index (EEI) of 0.2 confirms its energy-saving character.
• Adaptive regulation: The ability to control the rotational speed allows for optimal adaptation of the pump to the operating conditions of the solar system, increasing its efficiency.
• Durable construction: The cast iron body and impeller made of composite material ensure a long service life even in harsh operating conditions.
• Quiet operation: The pump design minimizes noise levels, which is particularly important in home installations.
• Simple installation: Compact dimensions (length 180 mm) and standard connections (1 1/2 inch) facilitate integration of the pump with the existing heating system.
• Wide temperature range: The pump can operate in an ambient temperature range from 2 to 70°C and a liquid average temperature from 2 to 110°C, making it a universal solution for various applications.
• Maintenance-free: The wet rotor design eliminates the need for regular bearing lubrication, resulting in low maintenance costs.

The ALPHA SOLAR pump is an ideal choice for both professional solar system installers and users looking for a reliable and efficient solution for utilizing solar energy in their homes. Its solid construction and advanced features guarantee long-lasting and trouble-free operation of the heating system. The maximum pump performance is 2.77 m³/h at a head of 122.16 kPa, and its power consumption is in the range of 2 to 60 W, which further emphasizes its energy-saving character.