WGO-4R - 106,000 BTU Output Cast Iron Gold Oil Boiler - Series 4 (Burner is not included)

Weil‑McLain WGO‑4R – 106 MBH Cast‑Iron Oil‑Fired Water Boiler with High-Efficiency Design

The WGO‑4R is a rugged, water-only oil boiler from Weil‑McLain’s trusted cast-iron lineup. With a 140,000 BTU/hr input rating delivering approximately 106 MBH output, it supports hydronic heating systems efficiently in both residential and light-commercial settings. Its robust cast-iron construction ensures long-lasting service life.

???? Contractor-Level Features Oil-Fired Cast-Iron Sections Three-section boiler constructed with durable cast iron, rated for 50 PSIG working pressure Oil Burn System Equipped with a full-service oil burner (burner purchased separately), recessed target wall, and factory-installed burner door for easy maintenance Convenient Fuel Conversion Standard configuration supports #2 fuel oil; can be adapted for off-road diesel or biofuel blends per burner specifications Flexible Vent Options Features two flue outlets (rear and top) for versatile chimney venting configurations Built-In Circulator & Switch Includes factory-installed circulator with service switch for simplified integration ???? Technical Specifications Specification Value Input 140,000 BTU/hr Net Output (DOE) 106,000 BTU/hr Construction Cast iron sections, 50 PSIG rating Venting Rear or top chimney vent outlet Burner Access Top cleanout and swing-away burner door Circulator Factory-installed with plug-in wiring harness Jacket Insulated heavy-gauge steel Recessed Target Wall Standard in combustion chamber for durability Warranty (HX/Parts) 20 years / 2 years ???? Installation & Service Notes Professional Installation Needed: Due to oil piping, burner setup, chimney connection, and system filling—installation must comply with NFPA 31 and local codes. Service Accessibility: Swing-away burner door and top access points allow quick servicing of the burner and cleanout plate. Vent Planning: Use either top or rear flue kits (supplied) with existing chimney; ensure proper draft per manufacturer specs. System Integration: Its factory-installed circulator and service switch streamline system hookup and future servicing. ???? Contractor Summary The WGO‑4R is a steadfast cast-iron oil boiler suitable for demanding hydronic applications. Its durable construction, flexible venting, and service-friendly design make it an excellent choice for both new installations and system upgrades. Rated to handle moderate-sized heat loads efficiently, it’s a reliable choice for professionals specifying proven oil-fired systems.