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SKU: 93209328
Grundfos NB 65-125/137 Cast Iron 7.5 kW End Suction Centrifugal Pump with Closed Impeller
Australia-Wide
(08) 9240 2992
Official Grundfos
Peace of Mind
Product Overview
Featuring an end-suction structural layout with DN 80 axial suction and DN 65 radial discharge ports, the NB 65-125/137 pump processes clean liquid media across active HVAC circuits. Powered by a 7.5 kW electric motor, the system operates across continuous commercial pumping cycles.
The hydraulic wet-end achieves a Maximum flow capacity of approx. 2298 L/Min with a maximum head rating of approx. 23.6 m. Cast iron housing materials provide solid pressure containment up to 16 bar. The internal assembly houses a stainless steel impeller fitted with bronze wear rings. Net equipment weight is 115 kg.
Power specifications for the NB 65-125/137 end-suction pump call for a 415 V three-phase electrical supply rated at 7.5 kW motor power. Current draw under load measures 14.3 Amps. Operating fluid temperatures span -25°C to 120°C with a maximum working pressure rating of 16 bar. The housing features DN 80 axial suction and DN 65 radial discharge ports.
The NB 65-125/137 electric motor carries an IP55 ingress protection rating alongside Class F thermal insulation and integrated PTC thermistors. System maintenance relies on back-pull-out architecture, enabling drive head disassembly while the pump volute stays secured to concrete foundation bases and pipe runs.
Features
- 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.
- O-ring seal between pump housing and cover eliminates leakage risk at the volute-to-cover joint under sustained operating pressures.
- Optimised impeller and volute hydraulics deliver unimpeded liquid flow through the pump casing, reducing internal turbulence losses.
IMPORTANT: Bulk freight charges apply. Please contact us for a freight quote before ordering.
SPECIFICATIONS
| Max Flow | 2298 L/Min |
| Max Head | 23.6 m |
| Power | 7.5 kW / 415v |
| Rated Current | 14.3 Amps |
| Suitable For | Facility Fluid Transfer & Circulation |
| 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 much fluid can this pump evacuate during peak demand?
At full operating capacity, the Grundfos NB 65-125/137 moves approx. 2298 L/Min to keep liquid levels controlled during peak inflow.
Which casing and impeller materials provide long service life in this pump?
Structural defense on the NB 65-125/137 is provided by a rugged EN-GJL-250 casing designed to withstand heavy mechanical stress.
How much electricity and current does this pump draw under load?
Running on 415 V three-phase power supplies, the NB-65-125-137 is driven by a 7.5 kW motor rated at 14.3 Amps.
Can this pump operate in warm or hot water without overheating?
Routine operational thermal ceilings enable the NB 65 125 137 to process liquids -25°C to 120°C.
What total dynamic head can this pump overcome in vertical pipework?
Vertical elevation capability on the NB/65/125/137 reaches a maximum dynamic head of approximately approx. 23.6 m under rated conditions.
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