Bell & Gossett NRF-22 vs. Grundfos UPS15-58FC: Which One Fits Your System
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If you're replacing a Bell & Gossett NRF-22 and considering a Grundfos alternative, the UPS15-58FC is the closest comparable model in our catalog. It's not an exact spec-for-spec match, and the differences matter enough to walk through before you order.
Spec Comparison
| Spec | B&G NRF-22 (103251) | Grundfos UPS15-58FC (59896341) |
|---|---|---|
| Flow rate | Up to 16 GPM at 25 PSI | Up to 17.2 GPM |
| Head capacity | 30 ft max | 19.3 ft, rated to 145 PSI |
| Horsepower | 1/25 hp | 1/25 hp |
| Speed control | Single speed | 3-speed selector (Low/Med/High) |
| Check valve | Not specified in listing | Integrated, removable |
| Voltage | Not specified in listing | 115V |
| Connection | Not specified in listing | 2-bolt flange |
| Construction | Cast iron, sealed-bearing wet motor | Cast iron, canned-rotor wet motor, ceramic bearings |
The Real Difference: Flow vs. Head
These two pumps trade off in opposite directions. The NRF-22 delivers less flow but more head capacity (30 ft vs. 19.3 ft) — it's built for a system with more resistance to overcome, like a longer piping run or more restrictive fittings. The UPS15-58FC delivers slightly more flow but less head, and makes up for the difference with its 3-speed selector, letting a contractor field-tune output to match the actual system rather than being locked to one fixed performance point.
If your existing NRF-22 install genuinely needs 25-30 ft of head to push water through the system, dropping in a UPS15-58FC set to its highest speed may still fall short. Check your system's actual head requirement, not just the flow rate, before treating this as a drop-in swap.
What's Actually the Same
Horsepower is identical at 1/25 hp, and both use cast iron wet-rotor construction with no mechanical shaft seal to leak or replace over time. If your system's head requirement falls within the UPS15-58FC's range, the underlying reliability profile is comparable between the two.
What You Gain Switching to the Grundfos
The 3-speed selector is the practical advantage: instead of being locked into the NRF-22's single fixed output, you get field-adjustable performance and a built-in check valve that the B&G listing doesn't specify as included. If your piping and fittings already accommodate the connection difference, that flexibility is worth factoring in.
Before ordering either one for a replacement, confirm your system's actual head loss calculation rather than matching flow rate alone. B&G NRF-22 (103251) is in stock, as is the Grundfos UPS15-58FC (59896341). Not sure which fits your system? Send us your system's flow and head requirements and we'll help you decide.