Armstrong 174035MF-113 H-41 Bronze Fitted Cast Iron Pump

For closed-loop hydronic heating, the Armstrong 174035MF-113 H-41 uses 1/6 HP single-phase power at 115 V with cast-iron, bronze-fitted construction and a 225°F maximum operating temperature.

The universal two-bolt flange pattern, non-ferrous plastic or Noryl impeller, ODP motor, and three-piece modular SBA shaft provide specific replacement references. Armstrong identifies this H41 item within its S&H circulator range, which uses modular shaft and bearing components for repair and parts planning.

Key Specifications of the Armstrong 174035MF-113 H-41 Hydronic Circulator Pump

- The 1/6 HP motor establishes the listed power class for circuit sizing and replacement comparison.
- Single-phase operation at 115 V identifies the documented electrical supply requirement.
- Cast-iron, bronze-fitted construction provides the stated body configuration for closed-loop hydronic service.
- The non-ferrous plastic or Noryl impeller identifies the documented rotating component material.
- An ODP motor enclosure requires environmental placement consistent with applicable installation conditions.
- The 225°F maximum operating temperature establishes a hydronic fluid-temperature boundary.
- The universal two-bolt flange pattern helps evaluate replacement fitment with compatible piping.

Hydraulic Performance, Efficiency and Application

Closed-loop hydronic heating and residential or commercial HVAC are the documented application contexts for this H41 circulator. Armstrong identifies the S&H family for HVAC and general-purpose service, but the exact SKU record does not provide flow, head, NPSH, pump curve, or efficiency values.

Installation and System Requirements

Confirm 115 V single-phase power, ODP motor environmental conditions, universal two-bolt flange fitment, fluid temperature below 225°F, and clearance around the three-piece modular SBA shaft before installation. Piping support, rotation, mounting orientation, and commissioning should follow Armstrong installation instructions.

Warranty, Support and Maintenance

Armstrong provides a 30-Month Limited Warranty from date of manufacture for circulators, covering defects in material and workmanship under normal use and service. Improper installation, maintenance, misuse, alteration, negligence, abnormal additives, and normal wear are excluded. The modular shaft and bearing arrangement supports service planning. Mulmotor provides pre-purchase product guidance and order-related customer support.