WGO-2 - 75,000 BTU Output Cast Iron Gold Oil Boiler - Series 4 (Burner is not included)

Weil-McLain WGO-2 – High-Performance Cast Iron Oil-Fired Water Boiler, 75 MBH

The Weil-McLain WGO-2 is a water-only, oil-fired boiler engineered for residential and light commercial hydronic systems. With a DOE heating capacity of 75,000 BTU/hr and durable cast iron construction, this model is designed to deliver long-lasting, efficient performance in closed-loop heating applications. The unit comes factory-equipped for ease of installation and features venting flexibility to accommodate various mechanical room layouts.

Engineered for Demanding Installations

• Heat Exchanger: Heavy-duty cast iron with factory-tested 50 PSIG rating; each section pressure-tested per ASME standards.
• DOE Heating Capacity: 75,000 BTU/hr
• AFUE: 85.2%
• Venting: Top and rear flue outlet options with included cover plates for unused ports.
• Burner Door Assembly: Hinged swing-out burner door provides full combustion chamber access.

Installation Features

• Knockdown or Assembled: Available in both formats to accommodate restricted access areas.
• Circulator & Service Switch: Factory-wired circulator with integral service switch and terminal strip simplifies field wiring.
• Recessed Target Wall: Integrated firebrick design minimizes damage during cleanings and enhances radiant heat transfer.
• Insulated Jacket: Steel outer jacket lined with insulation to minimize standby heat loss.

Contractor Considerations

• Combustion: Compatible with standard oil burners (Beckett, Carlin, Riello models available per order).
• Controls: High-limit control, circulator relay, and wiring harness included; low water cutoff optional.
• Safety: Complies with ASME Section IV standards; includes pressure relief valve tapping and drain fittings.

Technical Overview

• Model: WGO-2
• Fuel: No. 2 Heating Oil
• Heating Capacity: 75,000 BTU/hr
• Net I=B=R Rating: 65 MBH
• Working Pressure: 50 PSIG (maximum)
• Vent Connection: 6” flue collar

Warranty

• Heat Exchanger: 20-Year Limited Warranty
• Other Components: 2-Year Limited Warranty

Application Notes

The WGO-2 is designed for closed hydronic systems and is not configured with a tankless coil or hot water tap. Use in conjunction with an indirect-fired water heater is recommended for domestic hot water production. Boiler sizing should be verified against heat loss calculations to ensure proper system matching. Installation must comply with all applicable national and local plumbing, mechanical, and electrical codes.

Summary

The Weil-McLain WGO-2 offers reliable, high-efficiency heating in a compact footprint, ideal for retrofit or new construction applications. With its cast iron build, flexible venting, and factory-wired components, this model supports quick installations and long-term system performance.