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Natural Gas Fired Water Tube Hot Water Boiler

Rated Capacity : 7~116MW
Pressure : 1.0 ~1.6 MPa
Application : Hotel, restaurant, hospital, school, swimming pool, farm, etc.
Certificate : ISO 9001, CE, SGS, BV, ASME
Fuel : natural gas, coke gas, LPG, and other gas fuel
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Product Description
The structure of natural 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 of sufficient output and high thermal efficiency (97%), 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. This series diesel fired boiler is delivered as whole when leaving factory, convenient for transportation, and has a short install period.

Natural gas fired water tube hot water boiler could offer large volume hot water, it could meet the requirement of large water needs. Generally, it is used for life, such as enterprise, hotel, hospital, office building, swimming pool, laundry, and gym, etc. sometimes, the natural gas fired hot water also supply hot water to industrial production.
1. Product Customization
Zhongding Boiler owns a mature R&D and design team, and cooperates with multiple scientific research institutions for a long time, i.e. Tsinghua University and Xi’an Jiaotong University. Zhongding Boiler could customize the boiler based on the requirement of customers, water quality and fuel characteristics, to meet the operating requirement and maximum the boilers’ effectiveness.

1) Burner  ----  Customer could designate the brand
2) Electric Control Cabinet  ----  Customers could choose PLC or touch screen control cabinet, also, the brand of electric elements could be designated.
2) Water Pump  ----  Customer could designate the brand, and the boiler could adopt variable frequency water supply, save energy and decrease operation cost.
4) Economizer  ----  The boiler could equipped with economizer based on customers’ requirement, to improve boiler thermal efficiency.
5) Water Treatment Equipment  ----  Based on the water quality, could equipped with different water treatment equipment, generally, there are soften water treatment and reverse osmosis water treatment equipment. 
6) Boiler Shell color  ---- Customer could designate the color of boiler shell, elegant appearance.

2. High Quality 


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.
3. Advanced Technology and Structure
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
Temperature (℃)
Water Supply 
Fuel Consumption Overall Dimension
Maximum weight for transportation
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, Zhongding 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 Documents
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
Zhongding Boiler is the industrial boiler professor of China, it is referred as technical innovated enterprise. The manufacturer base is located in Zhengzhou Airport Economy Zone, and covers an area of 130 thousands m2. The company owns about 800 employees, including 110 technical engineers, and about 700 sets advanced manufacturing equipment. Zhongding Boiler concentrates on the invention of high-tech and energy saving boilers, has owned more than 20 sorts national patent technologies. 


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