Grundfos ALPHA1 15-80 130

The ALPHA1 15-80 130 is a unique compact high-head circulator pump from Grundfos’ ALPHA1 series, delivering an impressive 8 meters (80 kPa) of head pressure with small 15mm (½”) connections in the standard 130mm flange-to-flange format. Unlike standard 25mm pumps, the 15-series is designed specifically for small-bore pipe systems, combi boilers, and tight mechanical spaces where larger pumps simply won’t fit. Despite its compact size, it delivers the same 8m head pressure as its larger counterparts – perfect for high-resistance systems with limited space.

Key Benefits

• High Head (8m / 80 kPa): Delivers powerful circulation for high-resistance systems – ideal for combi boilers, small-bore pipework, and multi-story applications where space is constrained.

• Compact 15mm (½”) Connections: Perfect for small-bore systems, combi boilers, and tight mechanical rooms – standard 15mm compression or threaded fitting compatibility.

• Industry-Standard 130mm Flange Distance: Direct replacement for older 15-series circulators in residential and light commercial systems.

• 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 (22-55W range).

• Space-Saving Design: Compact dimensions allow installation where full-size 25mm pumps cannot fit.

Performance Details
The ALPHA1 15-80 130 delivers a maximum head of 8 meters (80 kPa) and a maximum flow rate of 2.2 m³/h. The pump features simple 3-speed manual control:

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

Why Choose the 15-Series (15mm / ½”)?
Most residential circulators use 25mm (1″) connections. The 15-series is designed for:

• Combi boilers: Many combi boilers require 15mm connections.

• Small-bore pipe systems: Common in European and older residential installations (microbore).

• Tight mechanical spaces: The smaller connection size allows installation where 25mm pumps won’t fit.

• High-resistance systems: Small pipe diameters create higher resistance – the 8m head overcomes this.

Flow Rate vs Pressure Trade-off
The 15-80 delivers 8m of head but only 2.2 m³/h maximum flow (compared to 4 m³/h on the 25-80). This means:

• ✅ Excellent for high-resistance, low-flow systems (combi boilers, microbore, fan coils)

• ❌ Not suitable for large-volume, low-resistance systems (underfloor heating, large radiators)

Applications & Usage

• Combi boilers (wall-hung) – Primary application

• Small-bore (microbore) heating systems – 8mm, 10mm, or 12mm pipework

• High-resistance radiator systems – Many small radiators on long pipe runs

• Fan coil units (FCUs) – Individual or small groups

• Domestic hot water recirculation (small-diameter loops)

• Tight mechanical rooms/boiler cupboards – Space-constrained installations

• Apartment heating systems – Individual unit circulation

• Replacement for older UPS 15-80 130 pumps

ALPHA1 15-80 vs ALPHA1 25-80: Which to Choose?

Choose 15-80 if: You have a combi boiler, microbore piping, or very tight space constraints.
Choose 25-80 if: You have standard 22mm or 1″ pipework and need higher flow rates.

ALPHA1 vs ALPHA2 (15-80 130): Which to Choose?

Durability & Reliability
Engineered for continuous operation in demanding, space-constrained environments:

• Stainless steel rotor can – corrosion-resistant

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

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

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

• Cast iron housing – durable and compact

• IP42 rating – protected against dust and dripping water

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

Customer Value
For NPF Store customers with combi boilers, microbore systems, or tight mechanical spaces, the ALPHA1 15-80 130 delivers the high head pressure needed to overcome small-pipe resistance without taking up valuable space. It directly replaces older UPS 15-80 pumps and other 15mm circulators. With energy savings of up to 50% compared to older pumps and simple 3-speed operation, it’s the perfect solution for demanding compact heating systems.

4. Key Features

• ✅ 8m Head (80 kPa) – High pressure for high-resistance small-bore systems

• ✅ 15mm (½”) Connections – Compact size for combi boilers and tight spaces

• ✅ 130mm Flange Distance – Industry standard – direct replacement for most 15-series pumps

• ✅ 3-Speed Manual Control – Simple, predictable operation

• ✅ Flow Rate (2.2 m³/h) – Adequate for combi boilers and small-bore systems

• ✅ Compact Design – Fits where 25mm pumps cannot

• ✅ 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

• ✅ Cast Iron Housing – Durable and compact

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

• ✅ Quiet Operation – < 45 dB – suitable for noise-sensitive installations

5. Technical Specifications