Firstco 9-320-4421 Hot Water Heating Coil with Circulating Pump

The Firstco 9-320-4421 is a factory replacement hot water heating coil assembly designed specifically for use with 30HB, 36HB, HBQB, MAQ, and MBQ series air handlers. This complete assembly includes an integrated circulating pump with flow check valve for reliable hydronic heating performance in residential and light commercial HVAC applications.

Key Features:

• 3-row copper tube coil design with aluminum fins for efficient heat transfer
• Dimensions: 18 inches high x 19 inches long
• Factory-installed circulating pump eliminates separate installation
• Built-in flow check valve prevents thermosyphoning
• Manual air vent for proper system purging
• Seamless copper tubes mechanically expanded into aluminum fins
• Galvanized steel casing frame for durability
• Designed for 300 PSI working pressure

This hot water coil is compatible with Firstco 30HBXB-HW, 36HBXB-HW, 30HBQB, 36HBQB, and related model air handlers. The integrated pump circulates hot water from the water heater through the coil, where return air absorbs heat before being distributed throughout the duct system. Ideal for retrofit applications or replacement of failed coils in hydronic heating systems.