4' Cast Iron Hydronic Baseboard, Right Hand Leg Panel

Weil-McLain 623-900-129 – 4-Foot Cast Iron Baseboard Radiation Panel

The Weil-McLain 623-900-129 is a 4-foot cast iron hydronic baseboard section designed for use in hot water or low-pressure steam heating systems. As part of the Baseray series, this unit provides quiet, consistent heating and exceptional thermal mass, making it ideal for both retrofit and new construction applications in residential or light commercial environments.

Engineered for Performance and Durability

• Construction: Solid cast iron for excellent heat retention and uniform temperature distribution
• System Compatibility: Designed for integration with both closed-loop hot water and steam boiler systems
• Function: Provides radiant and convective heat output in perimeter or baseboard heating layouts
• Installation: Floor-mounted using integrated cast support legs; compatible with standard end caps and couplings

Performance Highlights

• Silent Operation: Cast iron eliminates the expansion and contraction noises often found in fin-tube baseboard systems
• High Thermal Mass: Maintains warmth for extended periods after system cycling, improving energy efficiency
• Durability: Cast iron body resists mechanical wear, scale buildup, and corrosion over decades of use
• Modular Configuration: Joins with other Baseray sections using Weil-McLain couplings for custom lengths

Technical Specifications

• Model Number: 623-900-129
• Length: 4 feet nominal
• Coverage Area: ~13.6 sq. ft. EDR (Equivalent Direct Radiation)
• Material: Cast iron
• Mounting: Floor-mounted with integral legs
• End Type: Intermediate panel (does not include end trim)

Installation Guidance

Installation of cast iron baseboard radiation should be performed by licensed HVAC or plumbing professionals. Proper support, pitch, and secure coupling to adjacent sections are critical for safe and efficient system function. Ensure compatibility with system pressure and water quality requirements.

Applications

• Residential perimeter heating zones
• Institutional or historical building retrofits
• Low-noise environments requiring radiant heat