An eco-friendly boiler refers to a boiler that, throughout its design, manufacturing, and entire operational lifecycle, features low pollutant emissions, high energy efficiency, low noise levels, minimal resource consumption, 

and a small environmental footprint.

The core indicators for eco-friendly boilers primarily encompass four aspects:

1.  Atmospheric pollutant emission concentrations: Such as nitrogen oxides, sulfur oxides, particulate matter, etc., serving as direct metrics for assessing a boiler's impact on air pollution.

2.  Thermal efficiency: Measures the boiler's ability to convert fuel energy into useful thermal energy. Higher efficiency means lower fuel consumption and greater environmental friendliness.

3. Fuel consumption: The amount of fuel consumed per unit of output (e.g., steam tonnage), directly impacting resource utilization and carbon emissions.

4. Flue gas temperature: Low-temperature flue gas represents potential for waste heat recovery. A lower flue gas temperature indicates higher thermal efficiency and reduced energy waste.

These four metrics collectively form a framework for evaluating a boiler's green, low-carbon, and high-efficiency performance, aligning with national “dual carbon” goals and high-quality development requirements.