SZS series gas-fired (oil-fired) hot water boiler

Capacity: 0.7-14 MW
Working Pressure: Fully-automatic operation
Applicable Gaseous Fuels: Natural gas, biogas, coke‑oven gas, LPG and other gas fuels
Applicable Liquid Fuels: Diesel, light oil, methanol, heavy oil, residual oil and other liquid fuels
Application Industries: Central heating for schools, hospitals, hotels, office buildings and other premises
Fully‑automatic operation: NOₓ ≤ 30 mg/Nm³ Thermal efficiency > 95%

    Product Introduction


    The WNS series oil/gas‑fired hot water boiler adopts a horizontal internal‑combustion, wet‑back,three‑pass structure. It is delivered as a complete packaged unit for easy installation and reduced on‑site workload. Equipped with a PLC full‑automatic control system, it supports unattended operation.

    Designed with full corrugated furnace and threaded flue tubes, the boiler creates a three‑pass heat transfer path: flue gas passes through the furnace (radiant heat transfer), reversal chamber and threaded flue tube bundle (convective heat transfer), effectively enlarging the heating surface area. Combined with a large‑volume furnace, tail‑end economizer and condenser, flue‑gas temperature can drop as low as 60 ℃ and thermal efficiency reaches over 95%.

    Supported by ultra‑low‑NOₓ combustion technology, nitrogen‑oxide emissions are controlled below 30 mg/Nm³ to satisfy strict environmental‑protection requirements. The hinged smoke‑box door enables easy opening for inspection and lowers maintenance difficulty.

    DZL Biomass-fired Horizontal Steam Boiler Flowchart

    Main Performance Advantages 01


    Premium Material Selection
    Boiler steel is sourced from national‑standard certified manufacturers to guarantee reliable quality.
    Fully‑Automatic & Unattended Operation
    Intelligent PLC control, field instruments and IoT connectivity jointly enable fully‑automatic boiler operation.
    High Energy‑Saving Efficiency
    Thermal efficiency exceeds 95%. High‑precision manufacturing improves heat‑transfer performance, while advanced waste‑heat recovery technology reduces flue‑gas exhaust temperature.
    Easy Maintenance
    Well‑thought‑out structural design simplifies inspection and servicing work.
    Eco‑Friendly Performance
    Ultra‑low‑nitrogen combustion technology ensures NOₓ ≤ 30 mg/Nm³.

    Main Performance Advantages 02


    Premium Material Selection
    Boiler steel is sourced from national‑standard certified manufacturers to guarantee reliable quality.
    Fully‑Automatic & Unattended Operation
    Intelligent PLC control, field instruments and IoT connectivity jointly enable fully‑automatic boiler operation.
    High Energy‑Saving Efficiency
    Thermal efficiency exceeds 95%. High‑precision manufacturing improves heat‑transfer performance, while advanced waste‑heat recovery technology reduces flue‑gas exhaust temperature.
    Easy Maintenance
    Well‑thought‑out structural design simplifies inspection and servicing work.
    Eco‑Friendly Performance
    Ultra‑low‑nitrogen combustion technology ensures NOₓ ≤ 30 mg/Nm³.

    Product Parameters


    Rated Working Pressure (MPa)Rated Outlet Water Temperature (°C)Rated Inlet Water Temperature (°C)Thermal Efficiency (%)Maximum Transportation Weight (t)Maximum Transportation Dimensions (L×W×H, m)
    0.709570>9543.25×1.80×2.10
    0.709570>958.34.40×2.16×2.52
    0.709570>958.94.70×2.40×2.75
    0.709570>9513.34.95×2.55×2.95
    0.709570>9514.35.35×2.65×3.30
    1.0011570>9519.55.95×2.75×3.15
    1.0011570>9522.67.05×2.80×3.25
    1.0011570>9525.87.05×2.80×3.25
    1.0011570>95337.90×3.45×3.70
    1.0011570>95468.00×3.75×3.95

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