Firstco 9-320-4431 Hot Water Heating Coil for 18HB/24HB/MB Air Handlers

The Firstco 9-320-4431 is a replacement hot water heating coil designed for use with Firstco 18HB, 24HB, and MB series hydronic air handler units equipped with pump modules. This OEM component ensures proper heating performance and maintains system efficiency.

Key Specifications:

• 3-row copper tube hot water coil construction
• Dimensions: 18 inches high x 16 inches long
• Integrated flow check valve for optimal water flow control
• Compatible with 18HBXB-HW, 24HBXB-HW, and MB series air handlers with pump
• Slide-out design for easier service and maintenance
• Manual air vent included on coil assembly

This hot water coil works in conjunction with the air handler's microprocessor-controlled flow control module to provide efficient space heating. The integrated flow check valve helps prevent water hammer and ensures proper GPM flow rates through the coil. Designed for multi-position installation in upflow or horizontal configurations.