Introduction
In the fast-paced industrial world, efficiency, reliability, and ease of installation are critical when selecting boiler systems. Package boilers have emerged as a go-to solution for industries requiring compact, high-performance steam and heat generation systems. These boilers are fully assembled at the factory, allowing for rapid installation and minimal on-site labor. With their compact design and transport-friendly structure, package boilers are widely adopted in sectors like food processing, textiles, chemicals, and pharmaceuticals. Their ability to deliver consistent and safe thermal energy while simplifying installation makes them a preferred choice across global industrial markets.
What Are Package Boilers?
Package boilers are pre-engineered, fully assembled boiler systems designed for easy installation and reliable performance. Unlike field-erected boilers that require complex assembly on-site, package boilers are delivered ready for connection and operation. Their compact structure not only saves floor space but also reduces the time and cost of installation. These systems are highly adaptable and can be used in a wide variety of industries, including food production, textile manufacturing, chemical processing, and pharmaceutical plants.
Because they are manufactured under controlled factory conditions, package boilers offer higher quality assurance and operational stability. Their quick startup capabilities and integrated safety systems make them ideal for facilities that need dependable thermal energy with minimal downtime.
ZOZEN’s Package Boilers: WNS, DZL, YQW, and YQL Series
ZOZEN, a leading industrial boiler manufacturer, has developed a series of advanced package boilers designed to meet the varied needs of industrial users.
WNS Series Package Boilers
The WNS series from ZOZEN features horizontal, internal combustion, three-pass wet-back oil/gas-fired package boilers. With a thermal capacity ranging from 1 to 20 t/h and working pressure from 0.7 to 2 MPa, these boilers are widely recognized for their high thermal efficiency and automated control system, allowing for unattended operation. These package boilers are suitable for applications that require clean and efficient steam generation.
DZL Series Package Boilers
ZOZEN’s DZL series package boilers are horizontal, single-drum chain grate boilers that burn coal or biomass. With a thermal capacity of 2 to 10 t/h and working pressure from 1 to 2.5 MPa, they are equipped with lightweight chain grates and feature a factory-assembled modular structure. These package boilers are especially suitable for industries looking to use renewable or low-cost solid fuels.
YQW Series Package Boilers
The YQW series includes horizontal oil/gas-fired thermal oil heaters. These package boilers provide thermal capacities from 1400 to 14000 kW and operate under working pressure of 0.8–1.0 MPa. With advanced coil structures, YQW package boilers deliver stable and uniform heat, making them ideal for precision-driven industries such as chemicals and textiles.
YQL Series Package Boilers
For users seeking compact and high-capacity thermal oil heaters, ZOZEN offers the YQL series vertical oil/gas-fired package boilers. They have thermal capacities of 7000 to 29000 kW and the same working pressure of 0.8–1.0 MPa. Their vertical design allows efficient use of space, while their integrated burner systems ensure optimal performance.
ZOZEN’s Technical Advantages and Manufacturing Strength
ZOZEN stands out in the global boiler industry due to its strong technical capabilities and rigorous quality standards. All of ZOZEN’s package boilers are certified under internationally recognized systems such as ASME, ISO, and more. The company uses fully automated CNC machinery and cutting-edge non-destructive testing (NDT) technology to ensure consistency, precision, and durability in every product.
Beyond manufacturing, ZOZEN supports full customization of package boilers to meet specific user needs—from fuel types and control systems to structural dimensions. Its strong R&D team continually innovates, enhancing the energy efficiency and environmental performance of its package boilers.
ZOZEN’s Global Success Stories with Package Boilers
ZOZEN’s package boilers have been successfully deployed across various international markets. A notable example is the export of a 15-ton WNS gas-fired steam boiler to a paper manufacturing plant in Venezuela. With the global paper industry’s rising demand for efficient and environmentally friendly steam solutions, ZOZEN’s boiler has become a key part of the plant’s energy system.
Another successful project involved a Malaysian company specializing in plastic processing, where ZOZEN supplied a 3-ton WNS three-pass oil-fired steam boiler. This package boiler features a threaded smoke tube and wet-back structure, improving thermal efficiency up to 100%. It was certified by Malaysia’s DOSH, and equipped with an IoT-based remote monitoring module. Since commissioning, the boiler has operated continuously and reliably, supported by ZOZEN’s real-time online technical services.

Conclusion
In the modern industrial era, package boilers are redefining how industries approach steam and heat generation. With their compact design, quick installation, and operational efficiency, they offer unmatched advantages. ZOZEN has become a global leader in this field, offering a wide portfolio of WNS, DZL, YQW, and YQL series package boilers that cater to a diverse range of industrial applications.
Backed by international certifications, cutting-edge manufacturing, and strong R&D capabilities, ZOZEN continues to deliver reliable and efficient package boilers for clients worldwide. For any industry in need of advanced thermal solutions, ZOZEN’s package boilers represent a smart and sustainable investment.