Currently, the primary fuel used in condensing gas hot water heating boilers is natural gas, which is a high-quality fuel. In the actual working process, it also adheres to the principles of energy conservation and energy conversion. That is, the mechanism and conversion of energy aim to facilitate fuel combustion, during which oxygen is indispensable. Based on the current operational conditions of most boilers, the oxygen required for combustion comes from external air.

After the mixing of natural gas and oxygen molecules, natural gas molecules combine with oxygen molecules, and both possess a certain temperature. In other words, the molecules participating in the combustion reaction themselves store a certain amount of energy. This energy is sufficient to enable these molecules to overcome the internal forces between them, so that when the molecules collide, they can generate enough force to break the bonds of the initial substances, subsequently forming stable new bonds, and ultimately leading to the production of reaction products.

From a strict analysis of the energy conservation theorem, the total energy q released by the gas entering the condensing gas hot water heating boiler system is theoretically equal to the total energy discharged by the boiler system. This includes the heat absorbed by the boiler water q1, the heat absorbed by the circulating water q2, the loss due to incomplete combustion q3, heat dissipation q4, and flue gas emission q5. That is, q = q1 + q2 + q3 + q4 + q5. Changes in the total heat value need to be adjusted according to the actual operating state of the condensing gas hot water heating boiler and the varying conditions of the return water temperature or outlet water temperature cycle. From this process, it can be understood that the delivery rates of gas and air should be appropriately adjusted based on the changes in the required total heat to improve the combustion efficiency of natural gas.