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Yuanda fuel oil gas fired boilers are packaged industrial steam or hot-water boilers designed to burn liquid fuels (like diesel or heavy oil) and gaseous fuels (natural gas, LPG, biogas, city gas, etc.). They are widely used in industrial applications requiring steam or heat generation, such as food & beverage, textiles, chemical plants, paper manufacturing, and more.

The fuel oil and gas fired boilers of Henan Yuanda Boiler Corporation Ltd, particularly the WNS series, feature a horizontal three-pass wet-back fire-tube design that enhances heat transfer efficiency by allowing flue gases to pass through the tubes three times before exiting. A large corrugated furnace increases the heating surface and supports stable, efficient combustion, while the wet-back reverse flame chamber design minimizes maintenance and improves overall reliability. These boilers offer excellent fuel flexibility, capable of burning liquid fuels such as diesel, heavy oil, and bunker oil, as well as gaseous fuels including natural gas, LPG, LNG, city gas, and biogas, with dual-fuel burner options available for added operational flexibility. Equipped with automatic PLC control systems, they ensure optimized combustion and safe operation through multi-level protections such as water level detection, flame failure safety, over-pressure, and over-temperature safeguards, along with high-quality burners and valve groups for efficient fuel performance. Designed for high efficiency, these boilers typically achieve thermal efficiency above 98%, maintain low exhaust temperatures often below 60°C to reduce heat loss, and offer low NOx emission configurations ranging from approximately 30–120 mg/m³ to meet environmental standards.