Armstrong 110116MF-203 S-45 LV Pump Less Volute

Medium-duty hydronic loops use Armstrong 110116MF-203 S-45 LV for circulating-system repair when the replacement pump must be supplied without its volute. Its 1/4 HP, 115 V single-phase assembly delivers up to 65 GPM against 21 feet of head and uses a 4-bolt circular flange pattern. Confirm volute compatibility, impeller clearance, shaft alignment, and mechanical seal condition before startup.

The Armstrong S-45 LV includes a maintenance-free three-piece assembly with a 4-1/8-inch impeller, carbon-ceramic mechanical seal, and 4-bolt circular mounting pattern. The pump is supplied less volute, so the existing casing or replacement volute must match the hydraulic assembly. Verified data does not include amp draw, RPM, operating temperature, dimensions, weight, thermal protection, or self-priming capability, so confirm the complete replacement configuration before ordering.

Key Features of Armstrong 110116MF-203 S-45 LV

- 1/4 HP motor supports medium-duty hydronic loop repair and replacement work.
- 115 V single-phase operation suits compatible residential and commercial heating circuits.
- 65 GPM maximum flow supports compatible medium-duty circulation systems.
- 21-foot maximum head helps match the selected hydronic replacement application.
- 4-1/8-inch impeller supports the specified S-45 hydraulic configuration.
- Carbon-ceramic mechanical seal helps contain circulating fluid under approved conditions.
- 4-bolt circular mounting pattern supports compatible large-volute replacement assemblies.
- Maintenance-free three-piece design reduces routine lubrication and service requirements.
- Flow curve, amperage, RPM, temperature, dimensions, weight, protection, and warranty require confirmation.

Why Choose Armstrong 110116MF-203 S-45 LV

This Armstrong replacement pump assembly supports medium-duty hydronic repairs while retaining compatibility with a suitable existing or replacement volute.

- Build: Three-piece maintenance-free construction, carbon-ceramic sealing, and a 4-bolt pattern support replacement service.
- Value: Reusing a compatible volute can reduce piping changes, labor, equipment downtime, and replacement complexity.
- Audience: Hydronic repair contractors, HVAC technicians, boiler service teams, facility maintenance crews, and pump specialists can use this assembly.

Applications & Use Cases

Use the Armstrong 110116MF-203 S-45 LV for circulating-system repair, medium-duty hydronic loops, commercial heating, and replacement pump assemblies. Physical dimensions, unit weight, and port reach were not supplied, so verify the 4-bolt pattern, volute fit, impeller clearance, motor access, wiring position, and service room 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 volute compatibility, purge air, inspect the carbon-ceramic seal, verify impeller clearance, and check shaft alignment during commissioning.

Clean the hydraulic assembly, inspect the mounting pattern, monitor for leakage, and verify the operating point during scheduled maintenance. Purchase the Armstrong 110116MF-203 S-45 LV hydronic replacement pump from Mulmotor.com for authentic equipment, applicable factory warranty protection, and pump support.