Grundfos ALPHA1 15-40 130

The ALPHA1 15-40 130 is the smallest and most energy-efficient member of Grundfos’ ALPHA1 15-series circulator pump family, delivering 4 metres (40 kPa) of head pressure with compact 15 mm (½”) connections in the standard 130 mm flange-to-flange format. Designed specifically for low-resistance, low-flow applications, this pump is ideal for small combi boilers, individual fan coil units, single underfloor heating loops, and domestic hot water recirculation in compact spaces. With ultra-low power consumption (as little as 18W) and whisper-quiet operation, it’s the perfect choice for energy-conscious homeowners and tight installations.

Key Benefits

• Low Head (4m / 40 kPa): Gentle circulation perfect for small combi boilers, fan coils, and underfloor loops – prevents noise and system stress.

• Compact 15mm (½”) Connections: Ideal for small combi boilers, fan coil units, and tight mechanical rooms.

• Industry-Standard 130mm Flange Distance: Direct replacement for older 15-series low-head circulators.

• Simple 3-Speed Manual Control: No complex settings – reliable, predictable operation.

• Ultra-Low Power Consumption (18-30W): Maximum energy savings for continuous operation.

• Space-Saving Design: Smallest footprint in the ALPHA1 range – fits anywhere.

• Whisper-Quiet Operation: < 40 dB – virtually silent, ideal for bedrooms and living areas.

Performance Details
The ALPHA1 15-40 130 delivers a maximum head of 4 meters (40 kPa) and a maximum flow rate of 1.8 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 15-40?
The 15-40 is the lowest-head, lowest-flow pump in the 15-series. Choose it when:

• Your system has very low resistance (short pipe runs, few radiators/fan coils)

• You need maximum energy efficiency (lowest power consumption)

• You have noise concerns (quietest operation)

• You have a small combi boiler (studio or 1-bedroom apartment)

• You need gentle circulation for underfloor heating loops

ALPHA1 15-40 vs 15-60 vs 15-80: Which to Choose?

Choose 15-40 if: You have a small system with low resistance and want maximum energy savings.

ALPHA1 vs ALPHA2 (15-40 130): Which to Choose?

Applications & Usage

• Small combi boilers – Studio and 1-bedroom apartments

• Individual fan coil units (FCUs) – Single room heating/cooling

• Single underfloor heating loops – Small bathroom or kitchen zones

• Domestic hot water recirculation (short loops)

• Tight mechanical rooms / boiler cupboards

• Small apartment heating systems (1 story, compact)

• Replacement for older UPS 15-40 130 pumps

• Solar thermal circulation (small systems)

Durability & Reliability
Engineered for quiet, efficient, continuous operation:

• 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 small combi boilers, fan coil units, or underfloor loops, the ALPHA1 15-40 130 delivers gentle, efficient circulation at the lowest possible energy consumption. It directly replaces older UPS 15-40 pumps and other 15mm low-head circulators. With power consumption as low as 18W (less than a light bulb) and whisper-quiet operation, it’s the perfect choice for energy-conscious homeowners and noise-sensitive installations.

4. Key Features

• ✅ 4m Head (40 kPa) – Gentle circulation for low-resistance systems

• ✅ 15mm (½”) Connections – Compact size for small combis and fan coils

• ✅ 130mm Flange Distance – Industry standard – direct replacement

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

• ✅ Flow Rate (1.8 m³/h) – Ideal for small systems

• ✅ Ultra-Low Power Consumption (18-30W) – Maximum energy savings

• ✅ Compact Design – Smallest footprint in ALPHA1 range

• ✅ 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)

• ✅ Whisper-Quiet Operation – < 40 dB – virtually silent

5. Technical Specifications