Roll over image to zoom
SKU: 93209326
Grundfos NB 65-125/125 Cast Iron 5.5 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
The NB 65-125/125 single-stage end-suction pump operates on a 415 V three-phase supply rated at 5.5 kW drive power. Built with an axial inlet port (DN 80) and top radial outlet port (DN 65), the unit connects into commercial hydronic heating networks, cooling tower water loops, and facility fluid transfer lines.
Under full duty load, the pump generates 1658 L/Min rated flow capacity and reaches a maximum head threshold of 14.85 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 107 kg.
Drive power on the NB 65-125/125 pump comes from a 5.5 kW electric motor operating on a 415 V three-phase electrical connection. Full-load running current measures 10.5 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 80 suction and DN 65 discharge flanges.
Built with an IP55 rated motor enclosure and Class F insulation, the NB 65-125/125 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
- ATEX Zone 1, 2, 21 or 22 certification available for operation in potentially explosive atmospheres (except E-model variants).
- Integrally cast suction and discharge ports with dedicated vent and drain ports provide direct connection points without additional fittings.
- No baseplate or grouting required to maintain correct shaft alignment and vibration levels within Hydraulic Institute standards.
- Cataphoretic electrocoating on cast iron internal surfaces provides barrier protection against oxidative corrosion in hydronic circulation loops.
- Close-coupled configuration eliminates coupling alignment procedures and reduces overall installation footprint compared to long-coupled alternatives.
- Ball bearing support arrangement accommodates both radial and axial thrust loads generated during continuous duty operation at rated speed.
- PN16 flanged connection ratings on sizes up to and including DN 150 provide elevated working pressure capability beyond standard EN733 10 bar ratings.
IMPORTANT: Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 1658 L/Min |
| Max Head | 14.85 m |
| Power | 5.5 kW / 415v |
| Rated Current | 10.5 Amps |
| Suitable For | Cooling Tower Hydronic Systems |
| Body Material | Cast Iron |
| Liquid Temperature | '-25°C to 120°C |
| Inlet Size | 80 mm |
| Outlet Size | 65 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.
How many meters of dynamic lift does this pump provide?
To overcome vertical elevation resistance, the Grundfos NB 65-125/125 develops a maximum pumping head of approximately 14.85 m.
How much fluid throughput does this pump move under full load?
At full operating capacity, the NB 65-125/125 moves up to 1658 L/Min to keep liquid levels controlled during peak inflow.
What materials make this pump durable against corrosion and wear?
Structural defense on the NB-65-125-125 is provided by a rugged high-grade alloy casing designed to withstand heavy mechanical stress.
What electrical voltage and motor kilowatt output drive this unit?
Running on 415 V three-phase power supplies, the NB 65 125 125 is driven by a 5.5 kW motor rated at 10.5 Amps.
What are the maximum installation depth and liquid temperature boundaries?
Routine operational thermal ceilings enable the NB/65/125/125 to process liquids -25°C to 120°C.
Need help choosing the right pump?
Our team of pump experts are here to help you find the perfect solution for your application.
- Free expert advice
- Pump sizing & system recommendations
- Fast response — call or email us