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Gas Fired Water Tube Hot Water Boiler

  • Rated Power 7~116MW
  • Pressure 1.0 ~1.6 MPa
  • Fuel Industrial production, hotel, restaurant, hospital, school, swimming pool, gym, etc.
  • Certificate ISO 9001, CE, SGS, BV

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The structure of SZS gas fired water tube hot water boiler is arranged as double drums longitudinal type “D” shape, it’s quickly assembled boiler with water tubes, has the characteristics sufficient output, high thermal efficiency, etc. The structure of furnace water cooling wall and convection gas pass is membrane wall, have good sealability, and effectively reduce refractory brick quantity and maintenance workload. The Layout of economizer at boiler tail could effectively reduces exhaust gas temperature and improve boiler thermal efficiency (97%). This series gas fired water tube hot water boiler is delivered as a whole when leave factory, convenient for transportation, and has a short install period.

Products Advantages

1. High Quality Assurance
1) There is a professional design engineer team, before manufacturing, every boiler design drawing have to be approved by boiler and pressure vessel experts of CSBTS ( State Bureau of Quality Technical Supervision ), and then the boiler could be produced only if qualified.
2) To ensure the raw materials quality, all the steel plates are special-used for boiler with the Inspection Certificates. The raw material materials are inspected when entering factory, and only the qualified material could be put in storage and used for production.

3) To ensure the welding quality, there a professional welding team, including more than 30 senior welders. The welding materials are stored under constant temperature and humidity, to ensure the welding material quality.

4) The welding quality will be further examined during boiler manufacturing, by using x-ray detection, ultrasonic flaw detection, magnetic test, or penetration test, etc.
5) To ensure the boiler quality, the leakproofness and strength of pressure parts will be tested. The hydrostatic test is to make sure no water drop or water mist leakage appear on steal wall or welding joint, no water leakage appear at the place of expansion, and no obvious residual deformation and abnormal situation.
6) To ensure no problems before boiler delivery, all the raw materials and boilers are supervised and inspected by the experts of Inspection Institution for Boiler and Pressure Vessel. We could offer the international quality certificates of ISO 9001 and CE, and the inspection report of SGS, BV, etc., Quality Certificates, Energy audit report, and Energy Efficiency Test Report, etc.

2. Safety Assurance

3. High Efficiency Assurance

4. Professional Installation and After-sale Team

1) Professional engineer installation team offer the door to door installation and after sale service. The boilers will operate smoothly and safety, and you will get them without worries.
2) 24 hours hot-line to solve your problems, and offer the professional technical supports and after sale service in time to all over the world.

5. Convenient Maintenance

1) There are manhole and inspection hole on the boiler, convenient for boiler internal installation, inspection and clean.
2) Membrane wall structure is used for furnace water wall and convection pass, good leakproofness, effectively reduce refractory brick quantity and maintenance workload.


Model Rated Power
Working Pressure
Outlet Water  Temperature
Water Supply  Temperature
Fuel Consumption Overall Dimension
Maximum weight
for transportation (t)
Light Oil (kg/h) Natural Gas (Nm³/H)
SZS7-1.0/115/70-Y(Q) 7 1.0 115 70 642 806 7.8×3.4×3.34 36.7
SZS10.5-1.0/115/70-Y(Q) 10.5 1.0 115 70 963 1137 7.1×3.66×3.5 39
SZS14-1.25/115/70-Y(Q) 14 1.25 115 70 1284 1551 10.2×6.6×4.8 46.2
SZS21-1.25/130/70-Y(Q) 21 1.25 130 70 1922 2322 12.3×7×5.4 57.2
SZS46-1.6/130/70-Y(Q) 46 1.6 130 70 4203 4923 15.6×9.4×7.8 -
SZS70-1.6/130/70-Y(Q) 70 1.6 130 70 6396 7753 15.9×8.7×8.9 -
SZS116-1.6/130/70-Y(Q) 116 1.6 130 70 10600 12848 16.8×9.6×9.2 -
Note: 1. Parameter is for reference only, if any changes should follow the factory technical data.
2. Here are parts of boiler products, Sitong Boiler could customize the specific boiler based on customers’ requirement.
Transaction Process
Customer Inquiry -- Offer Professional Consulting Service -- Place Order -- Customize Boiler Based on Customers’ needs --Production-manufacturing -- Payment -- Impeccable After Sale Service (installation and debugging, periodic maintenance, etc.)

Offered Technical Documentations
Installment and Operation Instruction
Quality Certificate
Inspection Certificate of Boiler quality
General Drawing of Boiler
Foundation Drawing
Boiler Body Drawing
Boiler Room Design Drawing
Drawing of Valves, Instruments and Accessories

Company Strength
Sitong boiler is a national approved and designated enterprise, with design and manufacture license permits of Class A boiler and D1, D2 pressure vessel. The company has passed ISO 9001 international quality system certification, and gained the international certificates of CE, SGS, and BV, etc. The boiler products are exported to more than 60 countries. The factory covers an area of 120 thousands㎡, equipped with plenty of international advanced manufacture equipment, such as CNC cutting machine, automatic submerged arc welding machine, X-ray detection machine, etc.
company strength of Sitong Boiler


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