Ultra 80 - 62,000 BTU Output High Efficiency Boiler - Series 4 (Natural Gas)

Weil-McLain Ultra 80 – 62,000 BTU Output High-Efficiency Gas-Fired Condensing Boiler

The Weil-McLain Ultra 80 is a fully modulating, gas-fired condensing boiler designed for residential hydronic heating systems. With an output of 62,000 BTU and a thermal efficiency rating of up to 94% AFUE, it delivers high-performance heating while meeting stringent energy standards. Ideal for applications requiring precise load matching and low return water temperatures.

Primary Features

• Modulation: 5:1 turndown ratio for load matching and reduced cycling under partial load conditions.
• Heat Exchanger: Cast aluminum alloy primary heat exchanger with corrosion-resistant coating; designed for high efficiency and extended service life in condensing conditions.
• Combustion: High-grade stainless steel mesh burner with quiet operation; sealed combustion system suitable for direct-vent or concentric vent configurations.
• Control System: Weil-McLain’s U-Control platform offers multiple temperature and zone control strategies, integrated diagnostics, outdoor reset, and domestic hot water priority.
• Application: Condensing design supports low-temperature radiant, baseboard, or indirect DHW heating circuits.

Key Technical Data

• Model: Ultra 80 (383500732)
• Input: 80,000 BTU/hr
• DOE Heating Capacity: 70,000 BTU/hr
• Net I=B=R Rating: 61,000 BTU/hr
• AFUE: Up to 94%
• Heat Exchanger: Cast aluminum (ASME-certified)
• Vent Diameter: 3" (PVC, CPVC, or polypropylene approved)
• Ignition: Direct spark ignition system

Installation Considerations

Professional installation is required due to combustion air, venting, condensate handling, and gas piping requirements. The boiler is wall-mounted and features a compact footprint suitable for mechanical rooms, closets, or utility areas. Clearance and access should be maintained per the installation manual for serviceability. The unit is shipped with a factory-installed temperature/pressure gauge, relief valve, and condensate trap.

Additional Features

• Outdoor Reset: Standard on all models for increased seasonal efficiency.
• DHW Priority: Integrated control prioritizes indirect-fired water heater operation.
• Low NOx Burner: Complies with most regional emission standards.
• Noise Control: Stainless burner assembly and insulated cabinet reduce sound output during operation.

Contractor Notes

The Ultra 80 offers a reliable solution for projects demanding high-efficiency condensing operation with flexible control options. Ideal for multi-zone radiant or mixed-emitter systems, it pairs well with indirect tanks and outdoor reset strategies. The built-in diagnostics simplify commissioning and maintenance. Suitable for new construction and retrofit applications where venting and load matching flexibility are priorities.