Product Description
The Weil-McLain 672619208940 Ultra Series 4 is a modulating condensing hot water gas boiler built for residential heating applications. It delivers 80 MBH input and 71,000 BTU per hour heat output at a 93.5% AFUE rating, making it one of the more efficient floor-mount gas boilers available for home heating systems. HVAC technicians and heating contractors rely on this boiler for high-efficiency hydronic heating installs where long-term fuel savings and precise temperature control matter most. The unit features a cast aluminum nano-coated heat exchanger that resists corrosion and improves heat transfer efficiency over time. A high-grade stainless steel burner handles combustion quietly, reducing noise in residential settings. The built-in U-Control system simplifies setup, diagnostics, and ongoing maintenance for service technicians. It supports temperature management across up to three different set points and allows control of multiple boilers from a single panel, making it well suited for zoned hydronic systems. The boiler includes a 5 to 1 turn-down ratio for precise modulation, outdoor reset capability, and domestic hot water priority. Venting is flexible, supporting PVC, CPVC, and polypropylene vent pipe for direct vent installation. The unit arrives with boiler circulators included, reducing installation time on the job. It is ASME certified, CSA certified, and Energy Star compliant. It is also listed for sale in California as a CEC compliant product. Operating on natural gas with a spark ignition system at 120 volts single phase, this boiler fits standard residential electrical and gas service. The supply and return pipe connections are both 1 inch. The unit dimensions are approximately 43 inches tall, 22-13/16 inches wide, and 19-15/16 inches deep. The slate gray jacket gives it a clean, modern appearance in mechanical rooms.
- Cast aluminum nano-coated heat exchanger for improved efficiency and corrosion resistance
- U-Control system allows easy setup, diagnostics, and multi-boiler management from one panel
- Flexible venting with PVC, CPVC, or polypropylene pipe for direct vent installation
Product Highlights
The Weil-McLain Ultra Series 4 gas boiler combines 93.5% AFUE efficiency with modulating combustion and advanced controls, making it a practical choice for residential hydronic heating upgrades and new installations.
Product Information
Standard Information
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Brand: WEIL-MCLAIN
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Manufacturer Part Number: 672619208940
Technical Specifications
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Collection: Ultra Series 4
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Application: Residential
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Fuel Type: Natural Gas
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AFUE: 93.5%
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Input (MBH): 80 MBH
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BTU Heat Rating: 71,000 BTU per hour
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Condensing: Yes
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Ignition System: Spark Ignition
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Installation Type: Floor Mount
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Vent Type: Direct Vent
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Material: Cast Aluminum
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Volts: 120V
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Phase: Single Phase
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Supply Pipe Connection Size: 1 inch
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Return Pipe Connection: 1 inch
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Zones: 3
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Height: 43-1/16 inches
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Width: 22-13/16 inches
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Depth: 19-15/16 inches
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ASME Certified: Yes
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CSA Certified: Yes
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Energy Star Compliant: Yes
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CEC Compliant: For Sale in CA
