Armstrong 116431MF-132 H-51 Cast Iron Pump 1/4HP 1PH

Residential boiler systems use Armstrong 116431MF-132 H-51 for light-commercial heating and compatible boiler loops. Its 1/4 HP, 115 V single-phase ODP motor operates horizontally at the in-line pump connection, while the flexible spring coupler and sealed bearing assembly support routine circulation service. Confirm the approximate 45 GPM capacity, system curve, and motor condition before startup.

The Armstrong Series 1050 H-51 uses a cast iron body, flexible spring coupler, and sealed bearing assembly in a horizontal in-line arrangement. Its ODP motor requires a protected installation location, while verified data does not include maximum head, amp draw, seal material, connection size, operating temperature, dimensions, weight, thermal protection, or self-priming capability. Match the pump to the boiler-loop duty point before installation.

Key Features of Armstrong 116431MF-132 H-51

- 1/4 HP motor supports residential and light-commercial boiler-loop circulation.
- 115 V single-phase operation suits compatible heating system electrical circuits.
- Approximately 45 GPM flow supports medium-duty hydronic circulation requirements.
- 1725 RPM motor speed supports the specified H-51 configuration.
- Cast iron body provides a rigid housing for boiler circulation.
- Horizontal in-line mounting suits compatible residential and light-commercial piping layouts.
- Flexible spring coupler transfers motor torque within the pump assembly.
- Sealed bearing assembly supports routine circulation without regular bearing lubrication.
- ODP motor requires protected installation away from direct water exposure.

Why Choose Armstrong 116431MF-132 H-51

This Armstrong cast iron boiler pump combines horizontal in-line mounting with flexible coupling and sealed bearing construction.

- Build: Cast iron, ODP motor, flexible coupling, and sealed bearing assembly support compatible heating systems.
- Value: Standard voltage and sealed bearings can simplify residential boiler replacement and routine maintenance.
- Audience: Residential HVAC contractors, boiler technicians, hydronic installers, property maintenance teams, and light-commercial heating specialists can specify this model.

Applications & Use Cases

Use the Armstrong 116431MF-132 H-51 for residential heating, light-commercial boilers, horizontal in-line circulation, and compatible hydronic loops. Physical dimensions, unit weight, and connection reach were not supplied, so verify pipe spacing, valve clearance, horizontal mounting, motor access, coupling room, wiring position, and lifting requirements before installation.

Warranty & Support

- Warranty: Armstrong USA general terms provide 12 months from installation, not exceeding 18 months from shipment, for applicable non-E.2 products.
- Confirm voltage, purge trapped air, inspect the seal and bearing assembly, verify coupling alignment, and check flow direction during commissioning.

Clean strainers, monitor the cast iron body for leakage, and inspect the flexible spring coupler during scheduled service. Purchase the Armstrong 116431MF-132 H-51 cast iron boiler pump from Mulmotor.com for authentic equipment, applicable factory warranty protection, and pump support.