Azucalido (Azuka) condensing boiler breaks the traditional boiler control principle, adopts the international advanced modular design concept, and uses advanced condensing heat recovery technology to design and produce advanced heat energy equipment representing the future development of the heating industry. Condensing boilers make full use of the energy in flue gas, resulting in low temperature of flue gas emission, thus achieving ideal low pollution emission and remarkable energy saving effect. The design of the boiler is precise and the structure is compact, which greatly reduces the area occupied by the boiler, makes the installation simple and saves the installation cost of users.