Commercial and Industrial Large-Scale Heating and Hot Water Energy-Saving and Gas-Saving Full-Premix Water-Cooled Low-Nitrogen Condensing Gas Boilers

• Customization: Available
• Function: Water Boiler, Hot Water Boiler
• Fuel: Gas-Fired
• Model NO.: CQSL
• Installation: Packaged Boiler
• Structure: Fire Tube
• Media: Hot Water
• Water Circulation: Mixed Circulation
• Drum Placement: Vertical Boiler
• Pressure: Low Pressure
• Manufacturing Level: B
• Burning Style: Chamber Combustion Boiler
• Usage: Industrial, Power Station
• Gas Supply Pressure (12t)/Kpa: 15-20
• Nox Emission (Mg/Nm³): <30
• Working Pressure: ≤0.1MPa
• Outlet Water Temperature: ≤85ºC
• Pressure Loss (Kpa): 30
• Main Power Supply (V/Hz): 380V/50Hz
• Transport Package: Overall Transportation
• Specification: 2.8-8.4MW
• Trademark: aikeduo
• Origin: China
• Production Capacity: 2, 000 Units/Year

Product Description

Product Description

Boiler Introduction

The water-cooled low-nitrogen condensing boiler is a condensing boiler with full-premix combustion. Its heating medium is water, operating pressure ≤ 0.1MPa (atmospheric pressure), and the outlet water temperature is less than 95℃. The fuel mainly uses flammable gases such as natural gas and liquefied petroleum gas.

Compared with traditional boilers, it can achieve an energy saving rate of 30%, reduce nitrogen oxide (NOx) emissions by 90%, and decrease carbon monoxide (CO) emissions by 30%, demonstrating significant functional advantages over traditional boilers.

The water-cooled low-nitrogen condensing boiler is mainly used for heating and providing sanitary hot water in schools, hotels, residential communities, airports and other places.

1.Vertical structural design, the whole machine features a small footprint and compact volume.

2.Adopts water-cooled low-nitrogen combustion technology, complying with the latest standards of GB/T 43676-2024 General Technical Requirements for Water-cooled Premixed Low-nitrogen Burners. The fire-blocking structure is more reliable, with larger pore diameters than metal fiber forms, making it less prone to clogging and requiring extremely low maintenance and cleaning frequencies, which is more suitable for the domestic environment. The water-cooled low-nitrogen combustion mode results in lower nitrogen oxide emissions.

3.Equipped with a dynamic mixer for more uniform mixing and better combustion effects. The air-fuel ratio is fully self-adaptive, with small pressure loss and strong backpressure resistance.

4.Water-tube furnace body structure reduces the water capacity of the equipment, enabling faster startup and smaller heat loss during furnace ignition.

Safe and Reliable

Low-nitrogen and Environmentally Friendly

1.36-fold safety protections, with automatic alarm for flameout.

2.Gas is automatically proportioned according to air pressure to maintain a constant air-fuel ratio.

3.Pilot ignition device prevents ignition deflagration.
4. Water-cooled pipe wall slit design for backfire prevention ensures higher safety and reliability.

1.Full-premix technology ensures uniform mixing of air and gas, reducing CO generation.

2.The burner is force-cooled by water to lower flame temperature and reduce nitrogen oxide (NOx) formation.

Simple Maintenance

High Efficiency and Energy Saving

1.The burner features large-spacing fire holes, eliminating the need for air filtration and ensuring it will never get clogged.
2.The heat exchanger adopts forced hot water circulation and pressure-balanced water channels, preventing air accumulation and scale deposition for long-term safe and efficient operation.
3.The Chinese-color touchscreen provides a clear display of the operating status, making human-machine interaction extremely simple.
4.The overall vertical structure saves installation space.

1.Full-premix combustion of gas and air with a low excess air coefficient ensures complete combustion and minimal flue gas emission.
2.Combustion proceeds from top to bottom, while hot water circulates from bottom to top, forming countercurrent flow for enhanced heat exchange and higher efficiency.
3.The stainless steel finned-tube condenser reduces flue gas temperature below the dew point, fully utilizing latent heat.
4.Proportional regulation provides heat on demand, further improving heat exchange efficiency.

Full-premix water-cooled low-nitrogen combustion

Finned-tube heat exchanger

1.Air and gas are completely premixed in advance, resulting in high combustion efficiency.

2.Frequency conversion fan enables stepless speed regulation, adjusting power on demand to reduce the number of boiler start-stops.

3.Water-cooled combustion mode lowers flame temperature, achieving ultra-low emissions (nitrogen oxides <30mg/m³).

4.With a lower air coefficient and constant air-fuel ratio, it shows higher efficiency than diffusion combustion under low-load conditions.

5.Compared with metal fiber burners, it has larger pore diameters, making it less prone to clogging.

1.High heat transfer efficiency: By adding fins to the base tube, the heat transfer area is greatly increased, allowing heat to be transferred to the fluid more quickly and improving the heat exchange efficiency.

2.Compact structure: It has a small footprint, showing obvious advantages in places with limited space, and can effectively save installation space.

3.Strong adaptability: It can cope with various complex working conditions and environments. Different materials and fin types can be selected according to different fluid properties and heat transfer requirements, and customized design can also be carried out.

4.Easy maintenance: The structure is relatively simple, and maintenance and cleaning are relatively easy. Regular maintenance and cleaning can keep it in good working condition and extend its service life.

Specification

Project	CQSL-2.8MW	CQSL-3.5MW	CQSL-4.2MW	CQSL-5.6MW	CQSL-7.0MW	CQSL-8.4MW
Rated Heat Input (MW)	2.8	3.5	4.2	5.6	7.0	8.4
Main Power Supply (V/Hz)	380V/50HZ	380V/50HZ	380V/50HZ	380V/50HZ	380V/50HZ	380V/50HZ
Maximum Gas Flow (Nm³/h)	280	250	420	560	700	750
Electrical Power (kW)	11.5	15.5	15.5	22.5	30.5	45.6
Weight (kg)	3854	4574	5315	6827	8393	9982
Water Capacity (kg)	763	952	1142	1512	1883	2259
Reference Heating Area (m^2)	23000-80000	29000-100000	34000--120000	46000-160000	58000-200000	68000-240000
Gas Pipeline Diameter (mm)	DN50	DN65	DN65	DN80	DN100	DN100
Flue Pipe Diameter (mm)	φ500(400*500)	φ550(400*600)	φ600(400*700)	φ700(500*800)	φ800(600*800)	φ850(700*800)
Operating Weight (Approx.) t	4.7	5.6	6.5	8.4	10.3	12.3
Rated Heat Supply (10^4kcal/h)	240	300	360	480	600	720
Rated Flow (Nm³/h)	240	300	360	480	600	720
Connection Port Diameter (mm)	DN200	DN200	DN250	DN300	DN300	DN350

Company Profile

Shandong Aike Duo Thermal Energy Technology Co., Ltd. was founded in 2008 and is located at the foot of the majestic Mount Tai. It is a leading integrated gas heating service provider in China. For more than a decade, "Aike Duo" has always adhered to the corporate vision of "building the first brand of gas heating in China and becoming the best clean heating supplier in China", and is committed to the research and production of "gas heating equipment" as well as the promotion and implementation of "distributed clean heating" solutions.

 

Through years of sharpening, Aike Duo has always moved forward with honors and has now grown into a "national high - tech enterprise" integrating production, research, and sales. It has multiple automated production lines and inspection lines, and has transformed into an automated digital factory. The production capacity of gas wall - hung boilers exceeds 600,000 units, and the annual production capacity of various types of industrial and commercial gas boilers is 10,000 units. It is the largest distributed gas heating equipment production base in northern China.

 

Aike Duo pursues the green production concept of low carbon and energy conservation, and upholds the scientific outlook on development that is responsible for society, the environment, and the economy. It has successively been awarded the titles of "Energy Conservation and Low Carbon Demonstration Park" and "Circular Economy Demonstration Park". Aike Duo took the lead in obtaining the Class B boiler production qualification in the wall - hung boiler industry and currently holds more than 80 national patents and dozens of industry and national honors.

Research and Development Center

Production Workshop

Production Workshop

Our Advantages

Quality Assurance:

Professional Advantages:

Price Advantages:

The products are qualified in quality and undergo factory testing. Any product can be certified according to customer requirements.

Nearly 20 years of experience in R&D and manufacturing of gas equipment.

High-quality and affordable, providing thoughtful services for every customer.

OEM Services:

After-Sales Advantages:

Large Scale:

Tailor-made according to customer needs.

Long-term after-sales service is provided for all equipment.

Factory area: 23,025m², production center: 18,000m², R&D center: 8,000m².

Certifications

Packaging & Shipping

After Sales Service

We provide comprehensive after-sales guarantee services for our products. 

For faults caused by non-human factors during the warranty period, we offer free maintenance;

after the warranty period, we provide lifelong maintenance, and only charge cost fees for the services.

FAQ

1.How many years is the product warranty?

The warranty period for household products is five years; for industrial and commercial products, it is two years.

2.Can this product be customized according to requirements?

Customization is supported. We can carry out personalized customization of products according to your drawings and requirements.

3.Why choose us?

Good product quality, reasonable and competitive prices.
Nearly 20 years of manufacturing experience with a mature product line.
OEM and ODM services can be tailored to your needs.
4.Are you a manufacturer or a trading company?
We are a manufacturer and source factory with nearly 20 years of manufacturing experience. You are welcome to visit and inspect our facilities.
5.If we purchase your products, what quality guarantees do you offer?
The components we use have passed our rigorous testing.
We have a strong QC team to control the quality of each production process.
Our philosophy is "credibility first, customer first, and quality satisfaction."