Description
The Grundfos 99906545 (ALPHA 15-55 HWR-T) is a Circulator Pump — High Efficiency ECM. High-efficiency ECM variable speed circulator. AUTOADAPT automatically optimizes pump performance. Nominal performance: 12.3US gpm at 6.562ft. Rated 115V, 1-Phase, 60 Hz. Applications include HVAC: Heating, HVAC: Air Conditioning, Plumbing: Hot Water Recirculation and more.
Genuine Grundfos Part
OEM component engineered and manufactured to Grundfos specifications. Maintains pump performance and warranty coverage.
Full Traceability
Genuine Grundfos parts carry manufacturer traceability from production through delivery. No counterfeit risk.
Authorized Source
PumpStop is an authorized Grundfos distributor. All parts are genuine — not aftermarket, not surplus.
Confirm Compatibility
Always verify part number against your pump model number and serial number before ordering. Contact PumpStop for parts identification assistance.
Technical Support Available
PumpStop technical team can identify correct parts from pump nameplate data, serial number, or model code. Call (781) 281-8905 or chat.
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Parts availability varies. Contact PumpStop to confirm stock, lead time, and pricing before placing an order.
| Model Number | 99906545 |
| Product Series | ALPHA |
| Series Description | Circulator Pump — High Efficiency ECM |
| Voltage | 115V |
| Phase | 1-Phase |
| Frequency | 60 Hz |
| Insulation Class | F |
| Protection Class (IP) | IP42 |
| Nominal Flow | 12.3US gpm |
| Nominal Head | 6.562ft |
| Max Operating Pressure | 145.04psi |
| Max Fluid Temperature | 230°F |
| Max Ambient Temperature | 104°F |
| Nominal Pipe Bore | 1 1/4 |
| Pipe Pressure Rating | PN 10 |
| Pipe Standard | NPSM |
| Impeller Material | Composite |
| Housing Material | Stainless steel |
| Approvals / Certifications | ETL, FCC, NSF |
| Electrical | Verify supply voltage, phase, and frequency match nameplate before installation: 115V, 1-Phase, 60 Hz. |
| Temperature limits | Do not exceed max fluid temperature 230°F or max ambient temperature 104°F. Exceeding limits damages seals and motor insulation. |
| Dry running | Do not run dry. ALPHA pumps use the pumped fluid to lubricate the shaft seal. Dry running destroys the seal within seconds. Install dry-run protection on all automatic installations. |
| Maintenance | Refer to the Grundfos Installation and Operating Manual (IOM) for correct installation, commissioning, and maintenance. Contact PumpStop for documentation. |
- Approvals
- ETL
- Built-in motor protection
- NONE
- Connection
- PN 10
- Density
- 61.35 lb/ft³
- Enclosure class (IEC 34-5)
- IP42
- Gross weight
- 5.76 lb
- Housing
- Stainless steel
- Impeller
- Composite
- Insulation class (IEC 85)
- F
- Length
- 150 mm
- Liquid temperature range
- 35.6 .. 230 °F
- Mains frequency
- 60 Hz
- Maximum current consumption
- 0.65 A
- Maximum head
- 18.05 ft
- Maximum operating pressure
- 10 bar
- Minimum current consumption
- 0.02 A
- Model
- A
- Net weight
- 5.06 lb
- Pipe connection
- 1.25
- Pressure rating for connection
- PN 10
- Pump housing
- Stainless steel
- Pumped liquid
- Water
- Range of ambient temperature
- 33.8 .. 104 °F
- Rated flow
- 12.3 US gpm
- Rated head
- 6.562 ft
- Rated voltage
- 1 x 115 V
- Sales region
- USA
- Selected liquid temperature
- 140 °F
- Terminal box position
- 6H
- TF class
- 110
- Thermal protec
- ELEC
- Type of connection
- NPSM
Dimensional Drawing
Wiring Diagram