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SKU: 93207145
Grundfos NB 32-125.1/121 Cast Iron 1.5 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
The NB 32-125.1/121 single-stage end-suction pump operates on a 415 V three-phase supply rated at 1.5 kW drive power. Built with an axial inlet port (DN 50) and top radial outlet port (DN 32), the unit connects into commercial hydronic heating networks, cooling tower water loops, and facility fluid transfer lines.
Under full duty load, the pump generates 325 L/Min rated flow capacity and reaches a maximum head threshold of 15.41 m. The heavy volute housing uses electrocoated cast iron to resist internal corrosion. A stainless steel impeller rotor assembly with bronze wear rings drives fluid transfer. Net product weight equals 45 kg.
Drive power on the NB 32-125.1/121 pump comes from a 1.5 kW electric motor operating on a 415 V three-phase electrical connection. Full-load running current measures 5.49 Amps. The pump processes liquid media over temperatures from -25°C to 120°C under line pressures up to 16 bar. Pipe connections use DN 50 suction and DN 32 discharge flanges.
Built with an IP55 rated motor enclosure and Class F insulation, the NB 32-125.1/121 electric motor incorporates internal PTC thermistor sensors against overheating. Servicing is simplified by the back-pull-out structural layout, enabling complete rotor and drive removal without disconnecting suction or discharge pipe joints.
Features
- All stainless steel shaft construction provides improved corrosion resistance compared to carbon steel alternatives in wetted service areas.
- Mechanical shaft seal can be replaced without removing the impeller, system piping, pump volute casing or drive motor from the installation.
- Housing, impeller and wear ring use dissimilar material pairings to prevent galling and ensure no sticking elements during extended standby periods.
- High-efficiency motor selection is configured to match the specific power supply characteristics, pumping environment and liquid properties of each installation.
- Back pull-out design allows complete rotating assembly removal including motor, coupling and impeller without disturbing pump housing or connected pipework.
- EN733 and ISO2858 dimensional compliance ensures interchangeability with other standard end-suction pumps across commercial and industrial installations.
- ATEX Zone 1, 2, 21 or 22 certification available for operation in potentially explosive atmospheres (except E-model variants).
IMPORTANT:Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 325 L/Min |
| Max Head | 15.41 m |
| Power | 1.5 kW / 415v |
| Rated Current | 5.49 Amps |
| Suitable For | High-Capacity Plant Room Pumping |
| Body Material | Cast Iron |
| Liquid Temperature | '-25°C to 120°C |
| Inlet Size | 50 mm |
| Outlet Size | 32 mm |
| Warranty | 24 Months |
Warranty & Returns
All products supplied by Foundation Pumps are covered by a minimum 12-month warranty unless otherwise stated. Some brands may offer longer manufacturer warranties. Warranty covers manufacturing defects, faulty materials and workmanship under normal use.
- Products must be installed correctly and in accordance with the manufacturer’s instructions.
- Warranty does not cover incorrect installation, misuse, dry running, normal wear and tear, unauthorised repairs or damage caused by external factors.
- Proof of purchase, photos, videos and installation details may be requested when assessing a warranty claim.
- The customer is responsible for returning the product to Foundation Pumps or the nominated service centre unless otherwise agreed.
- Removal, reinstallation, labour and associated site costs are generally the customer’s responsibility unless required under Australian Consumer Law.
- Change-of-mind returns may be accepted within 30 days provided the product is unused, uninstalled and returned in its original packaging.
- Customers are responsible for return freight costs for change-of-mind returns.
- Restocking fees may apply to special-order, bulky or non-stocked products.
- Used, installed or specially ordered products may not be eligible for change-of-mind returns.
- If a product arrives damaged or faulty, please contact Foundation Pumps as soon as possible so we can assist with the appropriate repair, replacement or refund.
Your rights under Australian Consumer Law are not affected.
Across floor-mounted distribution pipework, how much volumetric throughput does this pump sustain?
Across floor-mounted distribution pipework, Grundfos NB 32-125.1/121 circulates an operational volume of approximately 325 L/Min.
How does the foot-mounted cast iron casing resist mechanical stresses transmitted from pipework?
Mechanical line rigidity in NB 32-125.1/121 is delivered by a foot-supported cast iron casing alongside a precision-cast bronze impeller.
How much electrical power in kilowatts and running current does this end-suction motor consume?
The heavy induction motor of NB-32-125.1-121 delivers 1.5 kW of shaft power, requiring a three-phase 415 V supply pulling 5.49 Amps.
Across primary boiler plant headers, what fluid temperature limits and working pressure apply?
Accommodating demanding temperature cycles from -25°C to 120°C, NB 32 125.1 121 maintains seal integrity under working pressures to 16 bar.
Across baseplate-mounted distribution lines, what dynamic pressure head does this unit develop?
Discharging fluid through end-suction volute geometry, NB/32/125.1/121 sustains a peak dynamic head of approximately 15.41 m.
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