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In order to save money, users may consider used boilers, as the cost performance of used boilers seems to be very high, but in fact, buying a boiler needs to be considered from many ways. The following are the common problems of used boilers.


In order to guarantee the rights and interests, it is recommended to buy brand-new boilers. Pay attention to the following points when purchasing new boilers:

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Big brand guarantees the boiler quality and after-sales service. ZOZEN is an AQSIQ approved boiler and pressure vessel manufacturer. We hold the ASME "S" and "U" Certificates and have earned ISO9001:2000 Certification.


The performance of gas boiler includes thermal efficiency and operational performance, etc. The higher the thermal efficiency, the more fuel is saved and the lower the cost.

After-sales Service

ZOZEN Boiler has set up service points all over the world, providing customers with all-round high-quality services such as project technical consultation, business negotiation and installation guidance.


ZOZEN Boiler is well aware of the needs of every customer, provides customers with a set of suitable design and boiler configuration, and is committed to maximizing the operating efficiency of boilers.


ZOZEN Boiler sets seven hold points and each one is supervised by a responsible inspector. Any work that fails to pass the inspection cannot proceed until the inspector is able to verify its quality.

Gas-Fired Steam Boiler

ZOZEN gas-fired steam boilers adopt the large-volume furnace which can ensure the sufficient combustion of fuel and high combustion efficiency. They have sufficient steam storage space and heating surface to generate high thermal power and high-quality steam with high efficiency. Meanwhile, they also have outstanding energy-saving and eco-friendly effects and can realize the ultra-low NOx emissions.

Capacity: 1-110 tph
Working pressure: 0.7-5.3 MPa
Thermal efficiency: Above 98%
Recommended boilers: WNS series/SZS series
Applicable fuel: Natural gas, biogas, liquefied petroleum gas, blast furnace gas, diesel, etc.
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    WNS Series Gas-Fired Steam Boiler

    WNS series horizontal internal combustion wetback gas-fired boiler has two-pass or three-pass structure according to the flue gas passes. It adopts domestically advanced corrugated furnace and threaded smoke tube to effectively improve the overall thermal efficiency of the boiler.


    SZS Series Gas-Fired Steam Boiler

    SZS series boiler adopts double drums and a D-type combustion chamber structure. The combustion chamber uses narrow-pitch membrane tube wall with good gas tightness to reduce the heat loss and improve the overall boiler thermal efficiency.

    Biomass-Fired Steam Boiler

    ZOZEN biomass-fired boilers optimize the feeding hopper, grate width and length, rotary speed of grate gear reducer, secondary air place and direction according to different biomass fuel characteristics in order to achieve high combustion efficiency.

    Capacity: 4-35 tph
    Working pressure: 1-2.5 MPa
    Thermal efficiency: Above 88%
    Recommended boilers: DZL series/SZL series
    Applicable fuel: biomass pellets, wood chips, corncobs, saw dust, etc.
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    DZL series biomass-fired steam boiler

    The DZL series tri-drum biomass-fired boiler is water tube boiler. It adopts the assembled structure with two pads. The upper part is heating surface and the lower part is combustion equipment.


    SZL series biomass-fired steam boiler

    ZOZEN SZL series biomass-fired steam boiler reasonably arranges the furnace arch, furnace wall and furnace heating surface, and adopts the separate air chambers to ensure the complete combustion of different biomass fuels.