WNS Series Gas-fired hot water boiler

Home / Product /WNS Series Gas-fired hot water boiler

  WNS series horizontal internal combustion boiler is a boiler shell type 3 passes wetback oil/gas fired boiler. After fuel is being atomized by burner, flame is full of the wave furnace and transfer heat via furnace wall, this is 1st pass; the high temperature smoke is collected in reversal chamber and then enters 2nd pass which is grooved tubes bundle area; after heat convection, air temperature gradually falls and goes to front smoke box and turn to 3rd pass, which is smooth tubes bundle area, and then enters chimney passing back smoke box and exhausted to the atmosphere.

  • Parameter
  • Characteristics
  • System flow chart
  • Related Case
Model WNS0.7-0.7/95/70- Y(Q) WNS1.4-0.7/95/70- Y(Q) WNS2.1-0.7/95/70- Y(Q) WNS2.8-0.7/95/70- Y(Q) WNS3.5-0.7/95/70- Y(Q)
Rated thermal power(MW) 0.7 1.4 2.1 2.8 3.5
Rated working pressure(Mpa) 0.7 0.7 0.7 0.7 0.7
Rated output water temperature(℃) 95 95 95 95 95
Rated feeding water temperature(℃) 70 70 70 70 70
Heating area(㎡) Body 26 58.8 90.65 112.59 127.68
Condenser 14 24.7 29.6 45.6 53.5
Thermal efficiency(%) >98 >98 >98 >98 >98
Fuel Nature gas, coke oven gas, biogas, methanol, light oil etc.
burning devices burner
consumptions Light oil 66 133 196 266 332
Natural Gas 72 144 216 288 360
Max. transportation weight(t) 4 8.3 8.9 13.3 14.3
Max. transportation dimension(m)(L×W×H) 3.25×1.8×2.1 4.4×2.1×2.46 4.6×2.31×2.62 4.7×2.48×2.85 5.3×2.65×3.3
Model WNS4.2-1.0/115/70-Y(Q) WNS5.6-1.0/115/70-Y(Q) WNS7-1.0/115/70-Y(Q) WNS10.5-1.0/115/70-Y(Q) WNS14-1.0/115/70-Y(Q)
Rated thermal power(MW) 4.2 5.6 7 10.5 14
Rated working pressure(Mpa) 1.0 1.0 1.0 1.0 1.0
Rated output water temperature(℃) 115 115 115 115 115
Rated feeding water temperature(℃) 70 70 70 70 70
Heating area(㎡) Body 180.91 189.87 205.57 346.19 418.2
Condenser 78.25 108.5 148.8 192.1 330.3
Thermal efficiency(%)   >98 >98 >98 >98
Fuel Nature gas, coke oven gas, biogas, methanol, light oil etc.
burning devices burner
consumptions Light oil 397 530 656 996 1327
Natural Gas 432 576 720 1080 1440
Max. transportation weight(t)   22.6 25.8 33 46
Max. transportation dimension(m)(L×W×H)   7.04×2.87×3.1 7.3×2.88×3.16 8×3.37×3.57 7.77×3.7×3.99


Digitized manufacture
  • The key part such as material cutting, rolling, drilling are proceeded by advanced CNC machining process to reduce the assemble stress and extend boiler working lifetime.
  • The front and back smoke chamber plates are cut by CNC plasma cutting machine and looks tidy and beautiful;
  • Easy operation and maintenance
  • Fully automatically operating, with automatically adjustment and protection of burning, water level, temperature and steam pressure
  • Digitized manufacture


    longer working life
  • Smoke tube and tube sheet connection is expanded first to eliminate the gap between them, then adopt automatic argon arc welding to relief the stress and expand boilers working life.
  • Longitudinal and girth joint adopt advanced automatic submerged-arc welding for good welding quality. All longitudinal and girth joint will have 100% radiographic inspection.
  • Fin tube us ND steel or stainless-steel material which avoid low temperature corrosion.
  • Inspection procedure point is set up to guarantee the sequence of expanding and welding, avoid cracking of the tube sheet holes
  • longer working life


    less fuel consumption
  • High quality aluminum silicate fiber is used with fire clay insulation, to control the boiler body temperature below 45℃ to control heat lost.
  • Sufficient steam storage room and heating area makes boiler to generate high quality steam and high thermal power
  • Condenser is added to reuse the waste heat of the exhausted smoke to increase feeding water’s temperature and reduce emission temperature, which can increase the thermal efficiency above 98% and save operating cost.
  • less fuel consumption


    Sufficient storage
    Sufficient steam storage and heating surface make the boiler to generate bigger thermal power and high quality steam output.Sufficient storage


    Smoke chamber
    The smoke chamber door is hinge structure and open like window so that it is so easy to maintain,detect and clean.Smoke chamber


    Corrugated furnace
  • This series boiler adopts whole corrugated furnace.
  • Reinforce the disturbance of flue gas as well as improving the heat
  • transfer effect of unit area and unit volume effectiently.
  • Increase the strength and elasticity of furnace . Prevent the pressure parts from being damaged because of the increase of stress effectiently during the thermal expansion procedure.
  • Corrugated furnace



    WNS Series Gas-fired hot water boiler-System flow chart

    Quotation Online