Armstrong 174031MF-043 S-25 AB All Bronze Centrifugal Pump

Domestic hot-water recirculation can use the Armstrong 174031MF-043 S-25 AB with 1/12 HP, 115 V single-phase operation, all-bronze lead-free construction, non-ferrous impeller, and interchangeable flange options from 3/4 inch through 1-1/2 inches.

This three-piece circulator uses a standard carbon-ceramic mechanical seal and permanently lubricated construction, reducing routine lubrication requirements. The listed small open-loop application requires careful review of water chemistry, connection size, temperature, and the actual circulation duty before replacement approval.

Construction and Service Details

- The 1/12 HP motor identifies the listed power class for small-loop electrical planning.
- 115 V single-phase operation supports compatibility checks for domestic-water installations.
- All-bronze lead-free construction provides the documented body material for open-loop service.
- The non-ferrous impeller identifies the rotating component material for application review.
- Carbon-ceramic mechanical sealing provides the stated seal arrangement for service planning.
- Interchangeable flanges from 3/4 to 1-1/2 inches support replacement fitment evaluation.
- Permanently lubricated construction removes the need for routine oiling during normal service.

Hydraulic Performance and Application

The S-25 AB is listed for domestic hot-water recirculation and small open-loop systems, but the supplied record does not state exact flow, head, NPSH, pressure, temperature, or efficiency values. The flange range supports dimensional screening, while actual circulation requirements still determine whether this model is suitable.

Installation Requirements

Confirm 115 V single-phase power, selected flange size, flow direction, seal compatibility, water chemistry, temperature limits, installation orientation, and service clearance before commissioning. The all-bronze construction supports material review, but lead-free construction alone does not establish every local potable-water approval requirement.

Warranty and Maintenance

Armstrong provides a 30-Month Limited Warranty from date of manufacture for circulators, covering material and workmanship defects under normal use and service. Improper installation, maintenance, misuse, alteration, negligence, abnormal additives, and normal wear are excluded. Permanently lubricated construction reduces routine oiling, while seal inspection remains relevant. Mulmotor can assist with product details and order questions.