ZOZEN Gas Hot Water Boilers: The High-Efficiency Core Powering Clean Heating Projects in Northern China

As clean heating upgrades continue to accelerate across northern China, high-efficiency and environmentally compliant heating equipment has become essential to ensuring winter heating security while supporting the country’s carbon reduction goals. In Tianjin, several large district heating companies have independently selected the same core solution — the ZOZEN SZS series gas-fired hot water boiler — delivering stable heat throughout the winter while contributing to improved air quality.

Replacing Coal with Gas: Tianjin Heating Companies Accelerate Clean Energy Transition
Tianjin Zhengyang Heating Co., Ltd., an experienced district heating operator, fully recognizes the importance of transitioning to clean energy. In response to the Tianjin Action Plan for Continuous Air Quality Improvement, the company upgraded its original coal-fired boilers and introduced three ZOZEN SZS series 29 MW gas hot water boilers in a single phase.

This upgrade not only significantly reduced pollutant emissions at the source but also marked a strategic shift toward greener and more efficient heating operations.

Multiple ZOZEN SZS series gas hot water boilers installed at a district heating project in Tianjin

Similarly, Tianjin Xuyang Thermal Management Co., Ltd., a state-owned enterprise responsible for heating more than 5.3 million square meters in Jinnan District, adopted a high-standard, clean-energy heating strategy from the project’s inception. After comprehensive technical evaluation, Xuyang Thermal selected the ZOZEN SZS 29 MW gas hot water boiler as the core unit of its heating system.

The choices made by these two heating companies demonstrate the reliability and suitability of the SZS series for large-scale centralized heating projects in northern regions.

ZOZEN SZS series hot water boilers serving multiple northern heating projects

Three Key Advantages Behind Reliable Heating Performance
The widespread adoption of the ZOZEN SZS series gas hot water boiler is driven by its balanced performance in efficiency, reliability, and environmental compliance.

High Thermal Efficiency
The SZS series employs advanced condensing technology, recovering latent heat from flue gas water vapor and significantly reducing exhaust temperatures. As a result, the boiler achieves a stable thermal efficiency exceeding 96% in actual operation. For large-scale heating companies, even a 1% efficiency improvement translates into substantial natural gas savings and lower operating costs.

Proven Structural Reliability
Featuring a classic D-type layout, full membrane water-cooled walls, and densely arranged convection heating surfaces, the SZS boiler delivers excellent heat transfer efficiency, compact structure, and long service life. The design is well-suited for prolonged high-load operation during northern heating seasons. Factory-assembled delivery further shortens on-site installation time, enabling faster project commissioning.

ZOZEN SZS series gas hot water boiler operating with high efficiency and stable heat output

Ultra-Low NOx Emissions
Equipped as standard with ultra-low-NOx burners, the boiler effectively controls nitrogen oxide formation through optimized combustion organization. NOx emissions are consistently kept below 30 mg/Nm³, fully meeting and exceeding Tianjin’s stringent environmental regulations.

Supporting Clean Heating Across Northern China
The successful application in Tianjin reflects only part of the ZOZEN SZS series’ footprint in northern China. From the Beijing-Tianjin-Hebei region to Northeast and Northwest China, ZOZEN gas hot water boilers are widely used in district heating systems, industrial parks, and large commercial complexes, providing reliable and clean heat sources.

A ZOZEN representative stated:
“Clean heating is closely linked to both public welfare and environmental protection. The SZS series gas hot water boiler was specifically developed to meet the demands of large-scale centralized clean heating. Going forward, we will continue to leverage proven technology and localized service capabilities to support the green transformation of heating systems across more northern cities.”

As the heating season progresses, ZOZEN-equipped heating stations are steadily delivering warmth to households — a result of engineering efficiency, environmental responsibility, and a manufacturer’s long-term commitment to sustainable energy development.