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Oil Fired Hot Water Boiler Under Normal Pressure

Rated Capacity :  0.35~14 MW
Pressure : 1.0MPa/10bar
Application : hotel, hospital, swimming pool, bath house, etc.
Certificate : ISO9001, CE, BV, SGS, ASME
Fuel : Diesel oil, heavy oil, light oil, etc.
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Product Description
Zhongding CWNS oil fired hot water boiler is jointly designed by Xi’an Jiao Tong University, it is a kind high efficiency heating equipment with full automatic control system. As this series boiler is working under normal pressure, it is very safe. It adopts the national patent technology, optimizes the design of oil gas fired boiler, to achieve a more reasonable combustion chamber and heating area, the thermal efficiency increases more than 10% compare with the ordinary boiler. The boiler is equipped with explosion proof equipment at the back of boiler, prevent deflagration in furnace, discharge high energy, and automatic reset as well, to ensure the boiler operate safety and efficiently.
This series natural gas fired hot water boiler is horizontal type fast assembly fire tube boiler with three pass structure, it has compact structure, small volume, strong load adaptability and low water quality requirement. This boiler adopts wet back structure, it can adapt to the high temperature, has a good sealing, increase the radiation heat transfer area and improve the heat transfer efficiency. 

Safety Protection System

1. Monitoring of water level: equipped with water level electronic detector to control the water level.
2. Setting time: the users can set the starting and stopping time as their demand.
3. Electric leakage protection: when the elements of boiler have a electric leakage, the control system will cut off power automatically.
4. Water shortage protection: when the boiler is lack of water, the system will turn off burner and raise alarm.
5. Power abnormal protection: when the power is abnormal, the boiler will stop working immediately.
6. Over pressure protection: when the pressure of boiler is over your setting point, burner will stop working and raise alarm.
7. The pressure controller, water level alarms, safety valves, low water level alarm and multiple safety protection.
8. Gas manifolds and protection system: to provide the filter, regulator, solenoid valve, etc, to ensure the security of the gas.
9. Flue gas monitoring: it can automatically monitor exhaust gas temperature of the boiler and more easily grasp the boiler’s combustion.
CWNS series gas fired hot water boiler is widely used for hot water supplying. Generally, it is usually used for school, hotel, swimming pool, bakery, greenhouse, farm, etc. Sometimes, it also used for industrial products.
1. Boiler 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.
3) 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) Zhongding Boiler owns a professional design engineer team, before manufacturing, every boiler design drawing will 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) Nondestructive testing will be done to ensure the welding quality, by using x-ray detection, ultrasonic flaw detection, magnetic test, or penetration test, etc.
5) Hydrostatic test will be done to ensure the leakproofness and strength of boiler pressure parts, generally, the testing pressure is 12.5 times of rated working pressure.
6) All the raw materials and boilers are supervised and inspected by the experts of Inspection Institution for Boiler and Pressure Vessel. There are international quality certificates of ISO 9001 and CE, we can also offer 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, head hole, and special hand hole on the boiler, and the front and back smoke chambers are equipped with movable doors, which are convenient for boiler internal installation, inspection and clean.
2) The explosion proof equipment has the fire sight glass and inspection gallery, it is convenient for furnace checking and maintaining.
Operation Process

CWNS series oil fired hot water boiler adopts the advanced horizontal type internal combustion three pass structure, decrease the temperature of exhaust smoke, improve the heat utilization efficiency and thermal efficiency. 

Model Rated Power
Supply water temperature
Return water
Temperature (℃)
Fuel Consumption Efficiency
Overall Dimension
Light oil (Kg/h) City gas (Nm³/h)
CWNS0.35 0.35 95 20/70 32.5 83.6 90 1280 1960×920×1255
CWNS0.58 0.58 95 20/70 53.8 138.6 90 1900 2670×1120×1485
CWNS1.05 1.05 95 20/70 97.4 250.8 90 2900 2930×1360×1760
CWNS1.4 1.4 95 20/70 129.9 334.4 90 3750 3300×1470×1890
CWNS1.75 1.75 95 20/70 162.4 418.1 90 3950 3530×1580×2010
CWNS2.1 2.1 95 20/70 194.8 501.7 90 4950 3800×1680×2110
Note: 1. Parameter is for reference only, we can design the boilers based on customers’ needs.
2. The working pressure is normal pressure (atmosphere pressure).

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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