Grundfos ALPHA1 25-40 130

The ALPHA1 25-40 130 is a low-head, energy-efficient circulator pump from Grundfos’ popular ALPHA1 series, delivering 4 meters (40 kPa) of head pressure in the industry-standard 130mm flange-to-flange format. This is the ideal pump for low-resistance systems such as underfloor heating, single-story homes with radiators, radiant ceiling panels, and domestic hot water recirculation loops. With simple 3-speed manual control and a budget-friendly price point, it is one of the most popular choices for smaller residential applications.

Key Benefits

• Low Head (4m / 40 kPa): Perfect for underfloor heating, single-storey homes, and low-resistance systems – prevents noise and system stress.

• Industry-Standard 130mm Flange Distance: The most common size for residential circulators – direct drop-in replacement for most older pumps.

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

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

• Energy Efficient: Consumes as little as 20W – significant savings over older UNO pumps (up to 50%).

• Ultra-Quiet Operation: < 45 dB – ideal for underfloor systems and noise-sensitive installations.

Performance Details
The ALPHA1 25-40 130 delivers a maximum head of 4 meters (40 kPa) and a maximum flow rate of 3 m³/h. The pump features simple 3-speed manual control:

The pump includes a manual air purge screw, status LED, and thermal overload protection for safe, reliable operation.

Why Low Head (4m) for Some Applications?
Not all heating systems need high pressure. Low-head pumps are ideal for:

• Underfloor heating: High pressure causes noise and discomfort. Low head = gentle, quiet circulation.

• Single-story homes with radiators: No need to push water upward – 4m is sufficient.

• Domestic hot water recirculation: Only needs to overcome friction loss, not gravity lift.

• Radiant ceiling/slab systems: Low resistance by design.

Applications & Usage

• Underfloor heating (wet systems) – Primary application

• Single-story homes with radiators – Standard 1-story residential heating

• Small apartments and condos

• Domestic hot water recirculation (small loops)

• Radiant ceiling panels

• Solar thermal systems (low-pressure collectors)

• Heat pump distribution (low-resistance fan coils)

• Chilled water cooling (small systems)

• Replacement for older UPS 25-40 130 pumps

ALPHA1 vs ALPHA2 (25-40 130): Which to Choose?

When to choose ALPHA1: You want a reliable, affordable replacement with simple operation.
When to choose ALPHA2: You want maximum energy savings (as low as 5W) and automatic performance optimization.

Durability & Reliability
Engineered for continuous operation (24/7/365):

• Stainless steel rotor can – corrosion-resistant

• Ceramic bearings – self-lubricating, wear-resistant (50,000+ hours typical life)

• Thermal overload protection – automatic shutdown prevents dry-running damage

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

• Cast iron housing – durable for decades of service

• IP42 rating – protected against dust and dripping water

• Wet rotor design – self-lubricating, no maintenance required

• Graphite thrust bearing – reduces friction and wear

Customer Value
For NPF Store customers seeking the most affordable, reliable, and popular low-head circulator pump, the ALPHA1 25-40 130 is the answer. It directly replaces thousands of older pump models (Grundfos UPS 25-40, Taco 005, Bell & Gossett NRF-22, and more) without pipe modification. The 4m head is sufficient for most single-story applications and all underfloor heating systems. With energy savings of up to 50% compared to older pumps, it pays for itself quickly. Simple 3-speed operation means no learning curve – just install, set, and forget.

4. Key Features

• ✅ 4m Head (40 kPa) – Optimized for underfloor heating and single-story homes

• ✅ 130mm Flange Distance – Industry standard – 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)

• ✅ Flow Rate (3 m³/h) – Adequate for most small-to-medium residential systems

• ✅ Low Power Consumption (20-35W) – Energy efficient for continuous operation

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

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

• ✅ Status LED – Basic operation monitoring (power on / fault)

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

• ✅ Cast Iron Housing – Corrosion-resistant and durable

• ✅ Ceramic Bearings – Long service life (50,000+ hours)

• ✅ Ultra-Quiet Operation – < 45 dB – ideal for living spaces

• ✅ Wet Rotor Design – Self-lubricating, maintenance-free

5. Technical Specifications