In industrial boiler applications, pressure gas boiler systems are categorized based on their working pressure levels. These classifications include low-pressure, medium-pressure, sub-high-pressure, and high-pressure boilers, each suited for specific operational needs. Low-pressure gas boilers operate with a working pressure below 1.25 MPa, making them ideal for light industrial processes such as textile washing or food processing. Medium-pressure boilers work under 3.8 MPa and are commonly used in industries requiring moderate steam output. Sub-high-pressure boilers are designed for a pressure of 5.3 MPa, serving manufacturing lines with higher thermal demand. High-pressure gas boilers, operating at 9.8 MPa, are typically found in heavy industrial facilities. Understanding the classification of a pressure gas boiler is crucial for selecting the right equipment for efficient and safe operations.
ZOZEN Boiler’s Comprehensive Pressure Gas Boiler Product Line
As an outstanding industrial boiler manufacturer, ZOZEN Boiler offers a full range of pressure gas boiler solutions to meet varying pressure requirements.
For low-pressure and medium-pressure applications, ZOZEN provides the WNS series gas-fired boilers. The WNS series is a horizontal fire-tube boiler with a capacity range of 1–20 tons/hour and a working pressure up to 2 MPa. It is widely used in food, textile, and laundry industries. This pressure gas boiler features a wet-back design, ensuring long service life and excellent thermal efficiency, typically above 98%. The WNS series also supports multiple fuels, including natural gas, diesel, and light oil.

ZOZEN Pressure Gas Boiler
For low-pressure, medium-pressure and sub-high-pressure requirements, ZOZEN offers the SZS series boiler.The SZS series is a water-tube boiler available in 2–110 tons/hour capacities, with pressure options ranging up to 5.3 MPa. Ideal for industrial applications, it features a D-type layout, membrane wall structure, and low-NOx combustion systems. Its high thermal efficiency and strong overload capacity make it a reliable pressure gas boiler for demanding processes.
Case Study: ZOZEN WNS Series Pressure Gas Boiler in Mauritius
A prominent laundry service company in Mauritius recently partnered with ZOZEN Boiler to upgrade its energy infrastructure. The client, undergoing rapid business expansion, required a reliable and energy-efficient pressure gas boiler system to meet increased demand. After comparing several manufacturers, the client selected ZOZEN’s WNS series oil-fired steam boiler for its superior design and technical advantages.
ZOZEN customized a 12-ton oil-fired boiler tailored to the client’s operational needs. This pressure gas boiler features a three-pass fire-tube structure, ensuring optimal heat transfer and combustion efficiency. It is also equipped with a rear economizer and condenser, significantly boosting thermal efficiency while reducing flue gas temperature and energy waste. Designed with multi-fuel compatibility, the boiler can operate with both heavy oil and diesel, providing flexibility in regions with variable fuel availability.
The client’s team visited ZOZEN’s manufacturing base and expressed high recognition for the company’s engineering capabilities and quality control. ZOZEN engineers provided remote installation guidance followed by on-site commissioning, ensuring safe and accurate installation. In addition, the engineers conducted thorough training sessions for local staff, guaranteeing smooth and efficient long-term operation of the pressure gas boiler system.
This project not only delivered a reliable energy solution but also highlighted ZOZEN’s commitment to global service and technical excellence in the pressure gas boiler industry.
Conclusion: Why ZOZEN is a Trusted Choice for Pressure Gas Boiler Solutions
In today’s industrial landscape, selecting the right pressure gas boiler is critical to achieving both operational efficiency and cost control. With a wide range of products covering low, medium, and sub-high pressure levels, ZOZEN Boiler provides tailored solutions to meet the specific requirements of various industries.
Whether it is the efficient WNS series, or the high-capacity SZS series, ZOZEN Boiler ensures that each pressure gas boiler delivers high performance, safety, and longevity. The successful case in Mauritius illustrates ZOZEN’s ability to deliver not only quality equipment but also comprehensive technical support and after-sales service.
As industries continue to pursue cleaner and more efficient energy solutions, ZOZEN Boiler remains a leading choice for pressure gas boiler systems worldwide—reliable, innovative, and responsive to the evolving needs of global enterprises.