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







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