Grundfos UPM3 FLEX AS 25-70 130mm 7m Circulating Pump – A-Rated High Efficiency

Description

Grundfos UPM3 FLEX AS 25-70 130mm Circulating Pump | A-Rated Central Heating Pump

The Grundfos UPM3 FLEX AS 25-70 130mm circulating pump is a high-efficiency, A-rated circulation pump designed for modern central heating and underfloor heating systems. Built as a reliable workhorse, it delivers excellent performance while maintaining very low energy consumption.

Its lightweight, compact design makes installation straightforward, even in restricted spaces commonly found within boiler casings or manifold cabinets. The UPM3 FLEX AS is digitally controlled, allowing it to adapt its operation precisely to system demand, improving efficiency and extending system life.

This pump is widely used in boilers, heating circuits, and water-based underfloor heating systems, where consistent flow and reliability are essential.

ONNECTION DETAILS

• Port-to-port length: 130mm

• Connections: 1″ ½ BSP threaded

• Note: BSP thread sizes do not correspond to ruler measurements
  (1″ ½ BSP ≈ 47.80mm outside diameter)

⚙️ TECHNICAL SPECIFICATIONS

• Maximum head: 70 dm (7 metres)

• Energy efficiency index (EEI): 0.20

• TF class: 110

• Pump housing: Cast iron

• Impeller material: PES 30% glass-fibre reinforced

• Maximum ambient temperature: 70 °C

• Maximum operating pressure: 10 bar

• Pumped liquid: Water

• Liquid temperature range: 2 °C to 110 °C

• Selected liquid temperature: 60 °C

• Liquid density: 983.2 kg/m³

• Power input (P1): 2 – 52 W

• Rated voltage: 1 × 230 V

• Mains frequency: 50 Hz

• Maximum current consumption: 0.04 – 0.52 A

• Enclosure protection class: IP44

• Thermal protection: Electronic