Weil-mclain 672619209046 Ultra Series 4 Hot Water Gas Boiler 399 Mbh 365 Mbh Output Condensing Modulating Floor Mount

Product Description

The Weil-McLain 672619209046 is a high-efficiency condensing gas boiler from the Ultra Series 4 lineup, designed for residential hot water heating applications. This floor-mounted unit delivers 399 MBH input and 365 MBH output, achieving a thermal efficiency of 91.07% AFUE. That level of efficiency makes it a strong choice for HVAC professionals looking to install a reliable, energy-conscious hydronic heating system in a home or light residential setting. The boiler runs on natural gas or propane, giving installers flexibility depending on the fuel available at the job site. At the core of this unit is a cast aluminum nano-coated heat exchanger. Cast aluminum transfers heat effectively while resisting corrosion over time. The nano-coating adds a layer of protection that extends the service life of the heat exchanger even in demanding operating conditions. The modulating condensing design features a 5-to-1 turn-down ratio, meaning the boiler adjusts its firing rate to match the actual heating load rather than cycling on and off at full capacity. This reduces wear, improves comfort, and lowers fuel consumption. Ignition is handled by a spark ignition system, and the unit operates on 120V single-phase power. The high-grade stainless steel burner is engineered for quiet operation, which matters in residential installations where noise can be a concern. The U-Control system simplifies commissioning and ongoing maintenance. It supports temperature management across up to three different set points and allows multiple boilers to be managed from a single control panel, making it suitable for larger or zoned residential systems. Outdoor reset capability and domestic hot water priority are built in, helping optimize efficiency based on outdoor conditions and household demand. Venting is compatible with PVC, CPVC, and polypropylene pipe, offering flexibility during installation. The unit is direct vent and comes with boiler circulators included. Supply and return pipe connections are both 1-1/4 inches. The boiler supports up to 3 zones. Dimensions are approximately 22-13/16 inches wide, 22-13/16 inches in length, 22-1/8 inches in depth, and 47-3/4 inches in height. It is ASME certified and CSA certified, and is approved for sale in California as CEC compliant. The slate gray jacket cover provides a clean, professional appearance.

• Cast aluminum nano-coated heat exchanger for efficient heat transfer and long-term corrosion resistance
• Modulating condensing operation with 5-to-1 turn-down ratio reduces cycling and improves fuel efficiency
• U-Control system supports up to 3 zone set points, outdoor reset, domestic hot water priority, and multi-boiler management

Product Highlights

The Weil-McLain Ultra Series 4 condensing gas boiler delivers 91.07% AFUE efficiency with modulating output, flexible venting options, and advanced controls built for residential hydronic heating systems. It is engineered for straightforward installation and long-term reliable performance.

Product Information

Standard Information

• Brand: WEIL-MCLAIN
• Manufacturer Part Number: 672619209046

Technical Specifications

• Collection: Ultra Series 4
• Application: Residential
• Fuel Type: Natural Gas, Propane
• Input Capacity: 399 MBH
• Output Heat Rating: 365000 BTU per hour
• AFUE: 91.07%
• Condensing: Yes
• Turn-Down Ratio: 5 to 1
• Ignition System: Spark Ignition
• Voltage: 120V
• Phase: Single Phase
• Installation Type: Floor Mount
• Vent Type: Direct Vent
• Compatible Vent Materials: PVC, CPVC, Polypropylene
• Heat Exchanger Material: Cast Aluminum
• Supply Pipe Connection Size: 1-1/4 inches
• Return Pipe Connection Size: 1-1/4 inches
• Zones: 3
• Width: 22-13/16 inches
• Length: 22-13/16 inches
• Depth: 22-1/8 inches
• Height: 47-3/4 inches
• ASME Certified: Yes
• CSA Certified: Yes
• CEC Compliant: For Sale in CA