Grundfos ALPHA1 25-80 130

The ALPHA1 25-80 130 is a high-performance circulator pump from Grundfos’ ALPHA1 series, delivering an impressive 8 metres (80 kPa) of head pressure in a compact 130 mm flange-to-flange format. Unlike the AUTOADAPT-equipped ALPHA2 series, the ALPHA1 offers manual speed control across three fixed curves, making it ideal for technicians and homeowners who prefer simple, predictable operation. The 130mm flange distance is the most common size for residential heating systems, ensuring direct drop-in replacement for thousands of older pumps.

Key Benefits

• High Head (8 m / 80 kPa): Ideal for multi-storey buildings (3+ floors), long pipe runs, or systems with high resistance (many radiator valves or small-diameter pipes).

• Compact 130mm Flange Distance: The industry standard for residential circulator pumps – direct replacement for most older pumps.

• Standard 25mm Connections: Direct fit for residential piping systems without requiring adapters.

• Simple 3-Speed Manual Control: No complex settings – just choose speed 1, 2, or 3 based on your system needs.

• Energy Efficient: Consumes up to 50% less energy than older UNO pumps (though less efficient than ALPHA2 AUTOADAPT models).

• Proven Reliability: Based on Grundfos’ legendary UPS platform with modern motor improvements.

Performance Details
The ALPHA1 25-80 130 delivers a maximum head of 8 metres (80 kPa) and a maximum flow rate of 4 m³/h. Unlike the ALPHA2 series, the ALPHA1 features simple 3-speed manual control:

The pump includes a manual air purge screw and status LED for basic operation monitoring.

Applications & Usage

• Large residential heating (3+ stories, 3500-6000 sq ft)

• High-resistance radiator systems (many TRVs, small bore pipes)

• Multi-family buildings (2-4 apartments)

• Domestic hot water recirculation (long, high-resistance loops)

• Solar thermal systems (taller buildings)

• Replacement for older UPS 25-80 pumps

• Systems where AUTOADAPT is not desired or compatible

ALPHA1 vs ALPHA2: Which to Choose?

Choose ALPHA1 for budget-friendly replacement with simple operation. Choose ALPHA2 for maximum energy savings and automatic optimisation.

Durability & Reliability
Engineered for demanding continuous operation:

• Stainless steel rotor can – corrosion-resistant

• Ceramic bearings – self-lubricating, wear-resistant

• Dry-running protection – thermal overload protection

• Manual air purge screw – easy de-airing during installation

• Cast iron housing – durable for decades

• IP42 rating – protected against dust and dripping water

Customer Value
For NPF Store customers seeking a powerful, reliable, and budget-friendly circulator pump, the ALPHA1 25-80 130 delivers 8 meters of head pressure in the standard 130mm flange size. It directly replaces older UPS 25-80 pumps (and many other brands) without pipe modification. While not as energy-efficient as the ALPHA2 series, it offers significant savings over older UNO pumps and provides simple, predictable operation that many technicians prefer.

4. Key Features

• ✅ 8m Head (80 kPa) – Maximum pressure for multi-story and high-resistance systems

• ✅ 130mm Flange Distance – Industry standard size – direct replacement for most residential pumps

• ✅ Standard 25mm Connections – Direct fit for residential piping systems

• ✅ 3-Speed Manual Control – Simple, predictable operation (no complex settings)

• ✅ High Flow Capacity (4 m³/h) – Adequate for large residential systems

• ✅ Permanent Magnet Motor – More efficient than older induction motors

• ✅ Manual Air Purge Screw – Easy de-airing during installation

• ✅ Status LED – Basic operation monitoring

• ✅ Thermal Overload Protection – Prevents damage from dry running or blockage

• ✅ Cast Iron Housing – Corrosion-resistant and durable

• ✅ Ceramic Bearings – Long service life

• ✅ Quiet Operation – < 45 dB at 1m

5. Technical Specifications