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

Hot water
Product thermal capacity: 0.7-14 MW
Working pressure: 0.7-1.25 Mpa
Available fuel: Natural gas, coke oven gas, biogas, diesel, heavy oil, light oil, crude oil, etc.
Available industries: Heat supplying, hospital, hotel

WNS series horizontal internal combustion boiler is classic 3-pass wetback oil/gas fired boiler. After fuel is atomized by burner, flame is full of the wave furnace and transfer heat via furnace wall, called 1st pass; the high temperature flue gasses are collected in reversal chamber and then enter 2nd pass, which is grooved tube bundle area through heat convection, air temperature gradually falls and flows to front smoke box and enter 3rd pass, which is done in the smooth tube bundle area, and then through back smoke box lead to chimney and exhausted to the atmosphere.

Technical advantages
Digitized manufacture
  • The key processes including material cutting, rolling, drilling are made by advanced CNC machining process to reduce the assembly stress and extend boiler working lifetime. 

  • The front and back smoke chamber plates are cut by CNC plasma cutting machine with tidy and beautiful look.
Easy operation and maintenance
  • Fully intelligent operation, with automatic adjustment and protection of burning, water level, temperature and steam pressure. The smoke box door uses the hinge structure for easy inspection, inventory and cleaning.

Long service life
  • The way to weld Smoke tube and tube sheet is to first expand to eliminate the gap between them, then adopt automatic argon arc welding to relief the stress and expand boiler service life.

  • Longitudinal and girth joint adopt advanced automatic submerged-arc welding for good welding quality. All longitudinal and girth joint are test by radiographic inspection.

  • Fin tube uses ND steel or stainless-steel material to avoid corrosion in the low temperature .

    Inspection stops are set up to guarantee the sequence of expanding and welding to avoid cracking of the tube sheet holes.

Less fuel consumption
  • High quality aluminum silicate fiber is used with fire clay insulation, to control the boiler body temperature below 45℃ and reduce heat lost.

  • Sufficient steam storage room and heating area to generate high quality steam and high thermal power.
  • Condenser is added to recycle the waste heat of the exhausted smoke to increase feeding water’s temperature and reduce flue gas emission temperature and increase the thermal efficiency over 95% and save operating cost.

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Zozen Boioer Co., Ltd. is one of the most powerful industrial boiler manufacturing enterprise in ChinaWNS series gas fired hot water boiler is energy conservation, low emissions, and thermal efficiency is higher than 98%, high level of automationThe structure of WNS series gas fired hot water boilerThe advantage of WNS series gas fired hot water boilerZozen Boiler is largest industrial boiler manufacturer, annual production scale exceeds 2000 sets of boilersZozen Boiler has the most automatical industrial boiler production line in China and a strict quality management system to ensure the quality of WNS series gas fired hot water boilerThe unique customized steam system solution of Zozen Boiler enables customers to achieve the maximum energy saving and lowest emission


Model Rated thermal power(MW) Rated working pressure
Rated output water temperature
Rated feeding water temperature
Maximum transport weight
Maximum transport size
WNS0.7-0.7/95/70-Q(Y) 0.7 0.7 95 70 4.0 3.25×1.80×2.10
WNS1.4-0.7/95/70-Q(Y) 1.4 0.7 95 70 8.3 4.40×2.16×2.52
WNS2.1-0.7/95/70-Q(Y) 2.1 0.7 95 70 8.9 4.70×2.40×2.75
WNS2.8-0.7/95/70-Q(Y) 2.8 0.7 95 70 13.3 4.95×2.55×2.95
WNS3.5-0.7/95/70-Q(Y) 3.5 0.7 95 70 14.3 5.35×2.65×3.30
WNS4.2-1.0/115/70-Q(Y) 4.2 1.0 115 70 19.5 5.95×2.75×3.15
WNS5.6-1.0/115/70-Q(Y) 5.6 1.0 115 70 22.6 7.05×2.80×3.25
WNS7-1.0/115/70-Q(Y) 7.0 1.0 115 70 25.8 7.05×2.80×3.25
WNS10.5-1.0/115/70-Q(Y) 10.5 1.0 115 70 33.0 7.90×3.45×3.70
WNS14-1.0/115/70-Q(Y) 14 1.0 115 70 46.0 8.00×3.75×3.95

* The above basic parameter table is for your reference, ZOZEN Boiler can customize the suitable boiler device and system solution based on your actual condition.

* All specifications and descriptions provided herein may be different from the actual specifications and descriptions for the product. ZOZEN Boiler reserves the right to make changes to this document and the product described herein, at anytime, without obligation on ZOZEN Boiler to provide notification of such change.

WNS series gas-fired (oil-fired) hot water boiler
WNS series gas-fired (oil-fired) hot water boiler
Product Thermal Power:0.7-14 MW Working pressure:0.7-1.25 Mpa
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  • 01
    Understanding you needs

    First, you can communicate with our professional boiler consultant through email, telephone, form or online chat.

    Here are some questions to know about you,eg:
    1. what are your energy types and energy saving requirements?
    2. the use of your boiler environment?
    3. what do you ask for the power of the boiler?
    4. what are you facing at the moment?

  • 02
    Make your solution

    Next, according to your needs and conditions of use, we will provide
    energy saving and reliable boiler system solutions.

    ——“ Let your boiler operate more efficiently and economically”

  • 03
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    We will regularly communicate with you to understand your boiler operation and guide according to your needs. If you have other needs, we will provide you with the first time. Include: