The WNS series gas steam boiler is a horizontal internal combustion three-pass fire tube boiler designed for efficient and reliable industrial steam generation. The boiler adopts a fully wet-back structure and advanced combustion technology to achieve high thermal efficiency and stable performance.
With a steam capacity ranging from 1 ton to 20 ton per hour, WNS boilers are widely used in industries such as food processing, textile manufacturing, chemical production, pharmaceuticals, and building materials.
The boiler system is delivered as a packaged unit, which simplifies installation and significantly reduces on-site construction time. Users only need to connect water, electricity, and fuel supply to start operation.
Technical parameters of Horizontal Fully-Automatic Oil/Gas Fired Steam Boiler
| Project Model | Rated Evaporation Capacity(t/h) | Rated steam pressure(MPa) | Rated Steam Temperature(℃) | Thermal efficiency(%) | Effective Water Volume(m³) | Diesel Consumption(Kg/h) | Natural Gas Consumption(Nm³/h) | Power Supply(V/Hz) | Main Steam Inlet(DN) | Auxiliary Steam Inlet(DN) | Inlet(DN) | Safety Valve Outlet(DN) | Number Of Safety Valves | Sewage Outlet | Chimney[mm（φ)] | Dimensions-Long | Dimensions-Width | Dimensions-High | Weight(T) |
| WNS1-1.25-Y/Q | 1 | 1.25 | 194 | ≥98% | 2.6 | 64 | 71.5 | 220/50 | DN65 | / | DN25 | DN40 | 1 | DN40 | 325 | 4112 | 2595 | 3110 | 4.7 |
| WNS2-1.25-Y/Q | 2 | 1.25 | 194 | ≥98% | 5.8 | 129 | 143.3 | 380/50 | DN80 | / | DN25 | DN50 | 1 | DN50 | 325 | 4700 | 2740 | 3415 | 6.9 |
| WNS3-1.25-Y/Q | 3 | 1.25 | 194 | ≥98% | 6.8 | 190 | 214 | 380/50 | DN100 | / | DN32 | DN65 | 1 | DN50 | 426 | 4790 | 3085 | 3535 | 8.5 |
| WNS4-1.25-Y/Q | 4 | 1.25 | 194 | ≥98% | 9.1 | 256 | 285 | 380/50 | DN100 | / | DN40 | DN50 | 2 | DN50 | 426 | 5955 | 3225 | 3765 | 10.4 |
| WNS4-1.6-Y/Q | 4 | 1.6 | 204 | ≥98% | 9.1 | 258 | 287 | 380/50 | DN100 | / | DN40 | DN50 | 2 | DN50 | 426 | 5955 | 3225 | 3765 | 11.1 |
| WNS6-1.25-Y/Q | 6 | 1.25 | 194 | ≥98% | 12.1 | 381 | 430 | 380/50 | DN125 | / | DN50 | DN65 | 2 | DN50 | 500 | 6420 | 3285 | 3950 | 13.6 |
| WNS6-1.6-Y/Q | 6 | 1.6 | 204 | ≥98% | 12.1 | 384 | 433 | 380/50 | DN125 | / | DN50 | DN65 | 2 | DN50 | 500 | 6420 | 3285 | 3950 | 14.6 |
| WNS8-1.25-Y/Q | 8 | 1.25 | 194 | ≥98% | 17.3 | 457.5 | 570 | 380/50 | DN150 | / | DN50 | DN65 | 2 | DN50 | 600 | 7360 | 3385 | 4130 | 17.7 |
| WNS8-1.6-Y/Q | 8 | 1.6 | 204 | ≥98% | 17.3 | 460 | 574 | 380/50 | DN150 | / | DN50 | DN65 | 2 | DN50 | 600 | 7360 | 3385 | 4130 | 19.1 |
| WNS10-1.25-Y/Q | 10 | 1.25 | 194 | ≥98% | 17.5 | 621 | 710 | 380/50 | DN150 | DN40 | DN50 | DN80 | 2 | DN50 | 700 | 8250 | 3840 | 4220 | 21.6 |
| WNS10-1.6-Y/Q | 10 | 1.6 | 204 | ≥98% | 17.5 | 625 | 715 | 380/50 | DN150 | DN40 | DN50 | DN80 | 2 | DN50 | 700 | 8250 | 3840 | 4220 | 22.3 |
| WNS15-1.25-Y/Q | 15 | 1.25 | 194 | ≥98% | 23.21 | 955 | 1050 | 380/50 | DN200 | DN40 | DN50 | DN100 | 2 | DN50 | 800 | 8510 | 4015 | 4530 | 26.8 |
| WNS15-1.6-Y/Q | 15 | 1.6 | 204 | ≥98% | 23.21 | 958 | 1055 | 380/50 | DN200 | DN40 | DN50 | DN100 | 2 | DN50 | 800 | 8510 | 4015 | 4530 | 29.5 |
| WNS20-1.25-Y/Q | 20 | 1.25 | 194 | ≥98% | 32.36 | 1270 | 1431 | 380/50 | DN200 | DN40 | DN65 | DN100 | 2 | DN50 | 900 | 9855 | 4145 | 4850 | 35.1 |
| WNS20-1.6-Y/Q | 20 | 1.6 | 204 | ≥98% | 32.36 | 1275 | 1435 | 380/50 | DN200 | DN40 | DN65 | DN100 | 2 | DN50 | 900 | 9855 | 4145 | 4850 | 37.7 |
Key Advantages of WNS Steam Boiler
1. High Thermal Efficiency
The boiler adopts a three-pass heat transfer design and corrugated furnace structure, improving heat exchange efficiency and ensuring stable combustion.
Thermal efficiency can reach 92%-95% depending on configuration.
2. Fully Automatic Control System
Equipped with PLC or touch-screen control system:
Functions include
● automatic ignition
● automatic water supply
● pressure control
● safety interlock protection
This ensures safe and convenient boiler operation.
3. Wide Fuel Compatibility
The WNS boiler supports multiple fuels:
● Natural Gas
● LPG
● LNG
● Diesel
● Heavy Oil
● Biogas
This flexibility allows users to choose the most economical fuel source.
4. Compact Packaged Design
The boiler is assembled and tested in the factory.
Benefits:
● fast installation
● reduced installation cost
● easy transportation
WNS Steam Boiler Structure
Main components include:
● corrugated furnace
● smoke tube heat exchanger
● combustion chamber
● burner system
● PLC control cabinet
● feed water pump
● safety valves
The full wet-back design improves durability and reduces maintenance requirements.
Technical Specifications
| Model | Capacity | Pressure | Temperature | Efficiency |
| WNS1 | 1 ton/h | 1.0 MPa | 184℃ | >92% |
| WNS1.5 | 1.5 ton/h | 1.25 MPa | 194℃ | >92% |
| WNS2 | 2 ton/h | 1.25 MPa | 194℃ | >92% |
| WNS4 | 4 ton/h | 1.25 MPa | 194℃ | >93% |
| WNS6 | 6 ton/h | 1.25 MPa | 194℃ | >93% |
| WNS10 | 10 ton/h | 1.25 MPa | 194℃ | >94% |
Industrial WNS boilers typically operate with steam pressures from 0.7-1.6 MPa and temperatures up to 204°C
WNS Steam Boiler Models
WNS1 Steam Boiler
● Capacity: 1 ton/h
● Fuel: Natural gas / diesel
● Application: small food factories, laundry plants
WNS1.5 Steam Boiler
● Capacity: 1.5 ton/h
● Ideal for medium industrial steam demand
● Widely used in textile dyeing and food processing plants.
WNS2 Gas Steam Boiler
● Capacity: 2 ton/h
● Popular for manufacturing plants
● Stable steam output
WNS4-WNS10 Industrial Steam Boilers
● Capacity range: 4-10 ton/h
● Used in large industrial production lines
● High efficiency with economizer system
Safety-Protection
Comprehensive safety protection functions include:
•Ignition pre-purge protection for the burner
•Overpressure protection for steam
•Four-level water level detection and interlock protection
•An independent extremely low water level probe (No. 5 probe) to prevent dry firing of the boiler
The boiler is equipped with a dustproof electrical control cabinet featuring:
•Emergency stop button
•Indicators for various operating conditions
•Fault display
•Audio and visual alarms
•Fault record
•Multiple protection functions interlocked to ensure safe operation under various conditions
High Thermal Efficiency - Energy Saving
Foster Wheeler Boiler uses a center-offset wet-back downstream combustion three-pass structure. The boiler body features a large furnace design with wide furnaces and sufficient flue tubes, effectively increasing the radiation heating surface and enhancing the thermal efficiency of the boiler.
Spiral guide vanes are installed inside the flue tubes, increasing the flue gas path length and extending the heat exchange time, thereby effectively improving thermal efficiency. The wet-back structure ensures that the rear tube plate is not directly exposed to high-temperature flue gases, significantly extending the life of the boiler.
The furnace liner is corrugated, providing good thermal expansion properties. A reasonable airflow design ensures uniform temperature distribution within the furnace and effectively absorbs the heat from the flame, inhibiting the generation of nitrogen oxides (NOx). Reliable International Brand burners ensure complete fuel combustion.
After applying energy-saving technologies, the average thermal efficiency of Foster Wheeler’s steam boiler series exceeds 98%, with flue gas outlet temperatures below 90°C.
Technology - Environmental Protection
Foster Wheeler Boiler is equipped with high-efficiency burners. Through the use of low-NOx burners and emission reduction technologies, the NOx emissions of Foster Wheeler boilers can meet environmental standards, with NOx emissions reaching below 30 mg/m³.
The large furnace design facilitates complete fuel combustion and reduces furnace thermal load, effectively lowering NOx emissions and meeting environmental requirements.
Smartness - Control
The boiler is equipped with an automated control system using a PLC programmable controller + touch screen control method. In line with the trend towards digitalization and intelligence, our company’s independently developed controller offers intuitive operation and strong expandability. Users can set the operating pressure of the boiler according to needs, and the system supports digital setting and automatic adjustment.
For water treatment, circulation pumps, and boiler feedwater pumps, manual/auto integrated switches are provided. For the burner, a switch for low/high fire is available, making maintenance easier.
With the PLC programmable controller + modules + supporting instruments, the system can be expanded to include variable frequency control, climate compensation, linkage control of multiple boilers, centralized control, and remote control.
Convenience - Design
Both the front and rear flue boxes are equipped with a pair of flue box doors, facilitating cleaning and maintenance of the flue tubes.
At the rear of the boiler, a viewing hole is provided for accurate observation of flame combustion. On top, there is a platform with guardrails and a manhole, and at the bottom, a cleaning hole is available, making maintenance and inspection operations more convenient. The boiler is equipped with both color and monochrome water level gauges to prevent misreading of water levels.
Industrial Applications
WNS series steam boilers are widely used in:
● food processing plants
● textile dyeing industry
● pharmaceutical factories
● chemical plants
● paper mills
● building material factories
Why Choose FirstD Boiler？
● 20+ years boiler manufacturing experience
● international burner brands (Riello / Baltur)
● strict welding inspection and pressure testing
● global export to 80+ countries
● professional technical support
