Hydrotherm 58-1858 Inducer Assembly

As a veteran tech, you know that a failing inducer is the most common reason for a furnace pressure switch lockout. The Hydrotherm 58-1858 Inducer Assembly is the definitive OEM replacement for obsolete BM-8002 and BM-8033 units. This 115V 2-speed inducer motor is a proprietary Fasco-manufactured assembly (cross-referenced as Fasco 7070-003) specifically engineered for Hydrotherm hydronic heating systems. Operating at 60 Hz on a single-phase circuit, this 3.3-inch frame motor draws 1.25/0.35 Amps, providing the precise negative pressure required to purge the heat exchanger and prove the draft before ignition. When you're dealing with boiler inducer motor failure, using this direct replacement inducer assembly ensures the correct RPM and CFM specifications to maintain combustion safety and prevent carbon monoxide buildup. Built in the USA with premium-grade materials, this draft inducer blower is designed to withstand the high-heat cycles typical of commercial and residential HVACR applications, ensuring reliable furnace ignition in demanding environments.

Key Benefits:

• Direct OEM Compatibility: Engineered as the specific factory replacement for Hydrotherm BM-8002 and BM-8033, eliminating mounting and wiring alignment issues.
• Dual-Speed Performance: The 115V 2-speed operation allows for variable airflow management, optimizing boiler efficiency and reducing operational noise.
• Durable Construction: Features a robust housing and high-temperature bearings to resist the 115-volt inducer motor seize-up common in older "oil port" style motors.
• Drop-In Installation: Compact 7" x 11.1" dimensions allow for efficient replacement in tight boiler cabinets, reducing labor time during emergency service calls.

Common Questions:

Does this assembly include the gasket?
Standard 58-1858 kits often require the reuse of existing hardware, but we recommend applying high-temp RTV silicone or a new inducer housing gasket to ensure a gas-tight seal at the flue connection.

Can I use a universal motor instead of the 58-1858?
Generic motors often lack the precise pressure switch tap locations or the correct dual-speed windings. Sticking with the OEM Hydrotherm 58-1858 avoids short-cycling and safety circuit errors.

Why is my inducer motor humming but not spinning?
This typically indicates a failed capacitor or seized motor bearings. If the shaft does not spin freely by hand, the entire blower motor assembly must be replaced to restore system operation.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.