Gas-fired steam boilers refer to steam boilers that use gas combustion for heating. Vertical steam boilers adopt a bottom-mounted combustion unit and a two-pass structure, ensuring complete fuel combustion, stable operation, and minimal space usage. Additionally, the flue tubes are equipped with baffle plates to slow down exhaust gas velocity and increase heat exchange, resulting in high thermal efficiency and reduced user costs. Horizontal steam boilers feature a shell-type, full-wet back, three-pass smoke tube structure. The flame burns in a micro-positive pressure within the large combustion chamber, fully extending with low heat load and high thermal efficiency, effectively reducing exhaust gas temperature, saving energy, and reducing consumption. They utilize a corrugated furnace tube and threaded flue tube structure, which not only enhances the boiler's heat absorption but also meets the needs of heat expansion on the heat exchange surface, making them scientifically designed, durable, and cost-effective.