Weil-mclain 383-500-734 High Efficiency Boiler 94000 Btu

Product Description

The WEIL-MCLAIN 383-500-734 is a high-efficiency condensing boiler designed for hydronic heating systems in residential and light commercial applications. Rated at 105,000 BTU input with a DOE output of 94,000 BTU and an IBR net rating of 81,000 BTU, this unit operates at 94% efficiency. It runs on natural gas or propane and uses electronic ignition with spark-assisted startup. The slate gray cabinet measures 22.8125 inches wide, 19.9375 inches deep, and 43.0625 inches tall. Installation and commissioning must be performed by a licensed heating professional in accordance with applicable codes and manufacturer instructions.

The 383-500-734 is built for forced hydronic heating installations where high efficiency and low operating costs are required. It supports direct vent configuration using PVC or AL29-4C flue material in 2-inch or 3-inch vent sizes, making it adaptable to a range of venting scenarios. The 1-inch water connection and 1/2-inch gas connection are standard for typical residential boiler installations. This is a Series 4 unit compatible with both natural gas and LP fuel supplies, giving installers flexibility across different fuel-supply environments.

Key Features

• 94% efficiency condensing operation reduces fuel consumption versus standard boilers
• 105,000 BTU input with 94,000 BTU DOE output and 81,000 BTU IBR net rating
• Dual fuel capability: operates on natural gas or propane
• Direct vent design supports PVC or AL29-4C flue in 2-inch or 3-inch diameter
• Electronic ignition with spark startup — no standing pilot
• 15-year limited heat exchanger warranty; 1-year parts warranty

Compatibility

Designed as a hydronic heating boiler for residential and light commercial systems requiring a high-efficiency, direct-vent condensing unit with natural gas or LP fuel supply. Consult WEIL-MCLAIN documentation for system design requirements and compatible controls.

Installation Notes

This boiler must be installed, commissioned, and serviced by a licensed heating or plumbing professional in compliance with local codes, IFGC requirements, and manufacturer instructions. Shut off gas supply and disconnect electrical power before servicing. Verify vent material compatibility — use only approved PVC or AL29-4C flue systems in the specified diameter. Warranty and technical support are available only through the licensed professional responsible for the installation.