WTGO-5R - 128,000 BTU Output Cast Iron Gold Oil Boiler w/ Tankless Heater - Series 4 (Burner not included)

Weil-McLain WGO-5R – High-Capacity Oil-Fired Water Boiler with Cast Iron Heat Exchanger

The Weil-McLain WGO-5R is a high-output, oil-fired water boiler engineered for dependable performance in residential and light commercial hydronic heating systems. Designed with a durable cast iron heat exchanger and multiple service-access features, the WGO-5R is ideal for new installations or system replacements where long-term reliability and efficient operation are required.

System Design Features

• Cast Iron Heat Exchanger: Precision-machined for maximum heat transfer and corrosion resistance; meets ASME Section IV standards.
• Tankless Coil Option: Integrated high-recovery coil provides domestic hot water without the need for a separate indirect tank (model-specific).
• Serviceability: Swing-away burner door and quick-release top panel provide unobstructed access to combustion chamber and flueway.
• Dual Flue Outlets: Rear and top flue tapping options allow for flexible venting arrangements based on site requirements.
• Factory Wiring: Pre-wired circulator and service switch included; high-limit control and circulator relay also installed.
• Recessed Target Wall: Reinforced for brush protection and extended heat exchanger life during routine cleaning.

Performance and Technical Data

• Input: 154 MBH
• DOE Heating Capacity: 134 MBH
• Net I=B=R Output: 117 MBH
• Working Pressure: Rated for 50 PSIG
• Construction: Cast iron with steel jacket and insulation to reduce jacket losses
• Flue Collar Size: 6 inches
• Dimensions: Length: 26 1/4" | Width: 20 1/2" | Height: 30 3/4"
• Warranty: 20-year limited on heat exchanger, 2 years on parts (residential use)

Installation and Application Considerations

The WGO-5R is available in both factory-assembled and knockdown configurations to accommodate restricted access locations. Installation must be performed by a licensed contractor per local and national mechanical codes. The boiler is non-condensing and requires proper draft through a conventional chimney system. Ensure appropriate sizing, flow rates, and control strategies to achieve optimal thermal performance and system longevity.

Professional Notes

• Control Integration: Compatible with outdoor reset and multi-zone systems when paired with appropriate system controls.
• Combustion Setup: Nozzle, pump pressure, and burner settings must be verified and adjusted based on local conditions and oil specifications.
• Domestic Coil Output (if equipped): Approx. 3-5 GPM recovery depending on model configuration and incoming water temperature.

Summary

The Weil-McLain WGO-5R is a proven performer in the oil-fired hydronic category, combining high output, flexible installation features, and robust construction. Its long service life, accessible design, and factory-installed components make it a solid choice for contractors seeking a dependable boiler platform for residential and light-duty commercial applications.