Weil-mclain 672619163706 Block Section Assembly for EG-35 with Tankless Opening Replacement 321-811-100

Product Description

The Weil-McLain 672619163706 is a block section assembly designed for use with the EG-35 cast iron boiler series. This replacement part includes a tankless opening, making it suitable for systems that require domestic hot water production through a tankless coil. Cast iron block sections are the core structural and heat-transfer components of a sectional boiler. Each section forms part of the boiler's heat exchanger, allowing hot combustion gases to transfer energy into the hydronic water circuit. Replacing a damaged or failed block section restores the boiler's rated heating capacity and maintains proper system efficiency. This assembly carries the manufacturer part number 321-811-100 and is built to Weil-McLain specifications for direct compatibility with EG-35 series equipment. HVAC technicians and heating contractors rely on OEM block sections to ensure proper fit, correct waterway alignment, and long-term durability. Using a manufacturer-approved replacement avoids the risks associated with aftermarket alternatives, including improper sealing, pressure loss, and premature failure. The EG-35 boiler is a cast iron sectional boiler commonly installed in residential and light commercial hydronic heating systems. These boilers are known for their long service life and ability to work with both natural gas and propane fuel sources depending on configuration. A tankless opening in the block section allows for the installation of a tankless coil, which heats domestic hot water directly from the boiler water without a separate storage tank. This is a common setup in older homes and commercial buildings where a single boiler handles both space heating and domestic hot water loads. Proper installation of this block section assembly requires draining the boiler, verifying section alignment, applying approved boiler cement or gaskets, and re-pressurizing the system according to local code requirements. This part weighs approximately 0.99 pounds and is classified as a replacement boiler part.

• OEM block section assembly for Weil-McLain EG-35 cast iron sectional boilers
• Includes tankless opening for domestic hot water coil installation
• Manufactured to original Weil-McLain specifications for direct fit and reliable performance

Product Highlights

The Weil-McLain 672619163706 block section assembly is a direct-replacement part for EG-35 series boilers, supporting both hydronic space heating and tankless domestic hot water applications. It delivers OEM-grade fit and durability for professional heating system repairs.

Product Information

Standard Information

• Brand: WEIL-MCLAIN
• Manufacturer Part Number: 672619163706

Technical Specifications

• Replacement Part Number: 321-811-100
• Compatible Model: EG-35
• Component Type: Block Section Assembly
• Tankless Opening: Included
• Item Type: Replacement Part
• Weight: 0.99 pounds
• UPC: 672619163706