In the winter heating equipment market, fully premixed condensing wall-mounted boilers have gradually become the preferred heating equipment for many households and commercial establishments due to their advantages of high efficiency, energy saving, environmental protection, and low carbon footprint. Compared with traditional wall-mounted boilers, fully premixed condensing wall-mounted boilers exhibit significant improvements in thermal efficiency, energy consumption control, and environmental performance. These advantages are underpinned by their unique core technology. To gain a deeper understanding of why fully premixed condensing wall-mounted boilers stand out in the heating sector, it is necessary to start with their core technology system and explore the secrets behind their efficient operation.

1. Fully premixed combustion technology: the foundation for achieving efficient fuel utilization

Fully premixed combustion technology is one of the key technologies that distinguish fully premixed condensing wall-mounted boilers from traditional wall-mounted boilers, and it is also the core foundation for achieving efficient combustion. This technology utilizes a dedicated premixing device to fully mix air and gas before entering the combustion chamber, ensuring that the ratio of the two reaches the optimal combustion state.

1. Precise ratio control: ensuring more complete combustion

The gas and air mixing in traditional wall-mounted boilers is mostly passive, and the mixing ratio is difficult to control precisely, which often leads to incomplete combustion of gas. This not only wastes fuel but also produces more pollutants. The fully premixed combustion technology of fully premixed condensing wall-mounted boilers, equipped with high-precision proportional valves and air flow sensors, can adjust the mixing ratio of gas and air in real time according to heating demand, ensuring that the two are always in an optimal ratio (usually with an excess air ratio controlled between 1.2 and 1.5). This precise control not only allows for more complete combustion of gas, reducing the waste of unburned gas, but also reduces the emission of harmful gases such as carbon monoxide and nitrogen oxides, meeting current environmental protection requirements.

2. Flameless combustion mode: enhancing combustion stability and safety

With the support of full premixed combustion technology, fully premixed condensing wall-mounted boilers adopt a flameless combustion mode. After the fuel and air are fully mixed, a uniform combustion layer is formed on the surface of the burner, with a short and dense flame, which is even difficult to observe directly with the naked eye. This combustion mode avoids the problem of locally high flame temperature in traditional flame combustion, reduces heat loss, and simultaneously lowers the occurrence probability of safety hazards such as flame instability and backfire, making the operation of wall-mounted boilers safer and more stable.

II. Condensation heat exchange technology: maximizing the recovery of waste heat from flue gas

Condensation heat exchange technology is another core technology for fully premixed condensing wall-mounted boilers to achieve ultra-high thermal efficiency. Its core principle is to recover the waste heat from the flue gas after gas combustion through a special heat exchange structure, and convert it into heating heat, thereby significantly improving the thermal efficiency of the wall-mounted boiler.

1. Heat exchanger made of special material: suitable for low-temperature corrosive environments

The flue gas generated after the combustion of gas contains a large amount of water vapor. When the temperature of the flue gas drops below the dew point, the water vapor condenses into water and releases a large amount of latent heat. Traditional wall-mounted boilers, due to the inability of their heat exchanger materials to withstand low-temperature corrosion, usually control the flue gas temperature above the dew point, resulting in the unrecovered latent heat. However, the condensation heat exchange technology of fully premixed condensing wall-mounted boilers utilizes special materials such as corrosion-resistant stainless steel or oxygen-free copper to make the heat exchanger, which can withstand the corrosion of acidic substances produced during the flue gas condensation process. At the same time, the heat exchanger is designed with a multi-channel, spiral, or finned structure, which increases the contact area with the flue gas, allowing the sensible heat and latent heat in the flue gas to be fully absorbed.

2. Dual-stage or multi-stage heat exchange design: heat recovery in layers

To more fully recover the waste heat from flue gas, some fully premixed condensing wall-mounted boilers adopt a dual-stage or multi-stage heat exchange design. The first stage of heat exchange is sensible heat exchange, which absorbs the sensible heat in the flue gas through a high-temperature heat exchange area. The second or subsequent stages are condensation heat exchange, which reduces the flue gas temperature below the dew point through a low-temperature heat exchange area, promoting the condensation of water vapor and the recovery of latent heat. Through this layered heat exchange design, the thermal efficiency of fully premixed condensing wall-mounted boilers can reach 105%-110% (calculated based on lower heating value), far exceeding the 85%-90% thermal efficiency of traditional wall-mounted boilers, achieving significant energy-saving effects.

III. Intelligent control system: ensuring efficient and stable operation of equipment

In addition to combustion and heat exchange technologies, intelligent control systems are also an important component of the core technological system of fully premixed condensing wall-mounted boilers. This system utilizes various sensors and intelligent algorithms to monitor and adjust the operating parameters of the wall-mounted boiler in real time, ensuring that the equipment is always in optimal operating condition.

1. Real-time parameter monitoring: dynamically adjusting operational status

The intelligent control system of the fully premixed condensing wall-mounted boiler is equipped with various monitoring devices such as water temperature sensors, flue gas temperature sensors, gas pressure sensors, and air flow sensors, which can collect key parameters such as heating water temperature, return water temperature, flue gas temperature, gas pressure, and air flow in real time. Based on these parameters, the system dynamically adjusts operating parameters such as gas supply volume, air intake volume, and fan speed through intelligent algorithms, ensuring that the wall-mounted boiler maintains optimal combustion and heat transfer efficiency under different heating loads, and avoiding energy consumption increase or equipment failure caused by parameter imbalance.

2. Adaptive and linkage control: Enhancing user convenience

The intelligent control system of some high-end fully premixed condensing wall-mounted boilers also features adaptive learning capabilities, which can automatically adjust the heating mode and temperature settings according to users' usage habits and changes in ambient temperature, reducing the hassle of manual operation for users. At the same time, the system can also be linked with indoor thermostats and smart home systems to achieve remote control, zoned heating, and other functions, allowing users to flexibly adjust the heating status according to their actual needs, further enhancing convenience and energy-saving effects.

IV. Low-nitrogen combustion technology: meeting stringent environmental standards

With increasingly stringent environmental protection policies, the requirements for nitrogen oxide emissions from wall-mounted boilers are also constantly rising. The fully premixed condensing wall-mounted boiler effectively reduces nitrogen oxide emissions through low-nitrogen combustion technology, meeting the current stringent environmental standards, which is also one of its core technological competitiveness.

1. Staged combustion and flue gas recirculation: reduce local high temperatures

Low-nitrogen combustion technology primarily reduces the generation of nitrogen oxides through two methods: firstly, staged combustion, which divides gas and air into multiple streams before entering the combustion chamber, preventing localized combustion temperatures from becoming too high and reducing the generation of thermal nitrogen oxides; secondly, flue gas recirculation, which reintroduces a portion of low-temperature flue gas into the combustion chamber, lowering the oxygen concentration and temperature in the combustion area and further suppressing the production of nitrogen oxides. By combining fully premixed combustion technology with low-nitrogen combustion technology, the nitrogen oxide emission concentration of fully premixed condensing wall-mounted boilers can be reduced to below 30mg/m³, significantly lower than the national first-level emission standards, meeting the requirements for use in regions with high environmental protection standards.

The core technologies of fully premixed condensing wall-mounted boilers revolve around efficient combustion, waste heat recovery, intelligent control, and environmentally friendly emissions. The fully premixed combustion technology ensures the full utilization of fuel, the condensation heat exchange technology maximizes waste heat recovery, the intelligent control system guarantees stable operation, and the low-nitrogen combustion technology meets environmental requirements. The synergistic effects of these core technologies make fully premixed condensing wall-mounted boilers excel in thermal efficiency, energy saving, environmental friendliness, and safety, making them mainstream equipment in the modern heating field. For consumers, understanding these core technologies not only allows them to more clearly recognize the advantages of fully premixed condensing wall-mounted boilers but also enables them to make more appropriate decisions when selecting heating equipment.