Precision diagnostic benchmarks, GPM hydraulic flow calculators, and drop-in OEM cross-reference matrices for Taco, Grundfos, Bell & Gossett, Armstrong, and Wilo hydronic heating loops.
Calculate required volumetric flow rate using the fundamental thermodynamic formula: GPM = BTU / (500 × ΔT) and benchmark frictional dynamic head loss across your loop.
Search and filter direct bolt-in replacements across Taco, Grundfos, Bell & Gossett, and Armstrong. All listed models feature standard 6-3/8" flange-to-flange dimensions.
| Model / Part # | Brand | Motor Type | Flange Length | Max Flow / Head | Wattage Draw | Replacement Action |
|---|---|---|---|---|---|---|
| Taco 007-F5 | Taco Comfort | PSC Induction | 6-3/8" (162mm) | 23 GPM / 10 ft | 85W (0.71A) | Check Current Price & Prime |
| Taco 007e-2F2 | Taco Comfort | ECM Permanent Magnet | 6-3/8" (162mm) | 16 GPM / 10 ft | 5W – 44W (Modulating) | Check Current Price & Prime |
| Grundfos UPS15-58FC | Grundfos | 3-Speed SuperBrute | 6-3/8" (162mm) | 17 GPM / 19 ft (Spd 3) | 60W / 75W / 87W | Check Current Price & Prime |
| Grundfos ALPHA2 15-55F | Grundfos | ECM AutoAdapt | 6-3/8" (162mm) | 21 GPM / 17 ft | 5W – 45W (Auto-Sensing) | Check Current Price & Prime |
| Bell & Gossett NRF-22 | B&G Xylem | Dura-Glide Wet Rotor | 6-3/8" (162mm) | 22 GPM / 15 ft | 92W (0.80A) | Check Current Price & Prime |
| Armstrong Astro 230CI | Armstrong Fluid | 3-Speed PSC | 6-3/8" (162mm) | 18 GPM / 18 ft | 55W / 70W / 96W | Check Current Price & Prime |
Access technician-grade root cause fault isolation, bolt-hole dimension verification, and high-efficiency ECM upgrade specifications.
Isolate air-locked hydronic zones from seized wet-rotor cartridges, test motor capacitor values, and bench-spin the shaft.
Dimension-by-dimension alignment for Taco 007, Grundfos UPS15-58, B&G NRF-22, and Armstrong Astro 230.
Full electrical and hydraulic submittal specs for the 5W–44W permanent magnet drop-in replacement.
Centrifugal wet-rotor pumps cannot compress or move air. When an air pocket enters the pump volute, water circulation stops immediately. Because 120V continues powering the stator without water flow carrying away thermal energy, 100% of the electrical input converts to resistive heat inside the motor casing.
No. Cast iron circulators (e.g. Taco 007-F5) are strictly engineered for closed-loop hydronic systems with zero dissolved oxygen. In potable open water circuits, continuous oxygen replenishment causes rapid internal rusting, seizing the impeller within weeks. Potable recirculation requires Bronze (007-BF5) or Stainless Steel (007-SF5) bodies.
Disconnect power and discharge the capacitor. Measure across the leads with a digital multimeter on the microfarad (µF) scale. A standard Taco or Grundfos run capacitor is rated at 5.0µF to 8.0µF ±5%. A reading below tolerance, 0.0µF, or infinite resistance indicates dielectric breakdown, preventing the motor from generating start torque.