Gas modular boilers demonstrate significant energy-saving effects: the system automatically adjusts the output of each modular boiler based on temperature changes indoors and outdoors over time, ensuring a constant balance between heat demand and supply. Compared to large single-unit boilers, they achieve approximately 30% energy savings. (1) Single large boilers experience a 12% decrease in annual fuel utilization efficiency due to heat load fluctuations. (2) Single large boilers incur a 7% standby heat loss during heat load fluctuations. (3) Single large boilers suffer an additional 4.5% chemical combustion loss during heat load fluctuations. (4) The forced-draft combustion method of single large boilers increases electricity consumption by 2%. (5) The ventilation regulators equipped with modular boilers save 2% in fuel costs. (6) The integration of intelligent control systems with modular boilers reduces energy consumption by 2.6%. The modular design of gas boilers, combined with the coordination and control of intelligent software, enables flexible, efficient, and economical operation of boiler units. For example, a heating station covering an area of 25,000 m2 utilizes 12-18 modular boilers as the heat source. Under manual adjustment, the minimum output adjustment accuracy is 8.3%, with a temperature adjustment range of 2.0°C. Under automated software control, the minimum output adjustment accuracy improves to 4.0%, with a temperature adjustment range of 0.5°C. This demonstrates the clear advantages of gas modular boiler units in improving heating quality, reducing operating costs, and lowering energy consumption. Regardless of seasonal conditions, each operating modular boiler operates at full load, while non-operating boilers consume no energy, ensuring the entire boiler unit operates at high efficiency. According to actual customer statistics, the combination of modular boilers with automated control systems significantly reduces excess heat loss, achieving an overall energy saving of 15.4%. **Atmospheric Direct-Fired Steel Modular Boiler Gas Cut-off Protection Device** The gas pipeline is equipped with high-pressure and low-pressure switches. When gas supply is interrupted or pressure drops below a certain value, the low-pressure switch closes, and the system locks. When gas pressure is too high, the high-pressure switch closes, and the system locks. **Power Failure Protection Device** In the event of a power outage, the system automatically closes the gas valve. When power is restored, the system automatically restarts. **Zoned Temperature Control System (Optional)** The automated control system of gas modular boilers includes an automatic room temperature control device for users. A temperature controller is installed indoors to manage the operation of solenoid valves and the boiler. When the room temperature falls below the set value, the controller signals the boiler to start, and the solenoid valve opens to supply heat. When the room temperature exceeds the set value, the controller signals the solenoid valve to close, stopping heat supply. If all solenoid valves in multiple zones are closed, the boiler automatically shuts down. This system ensures that indoor temperatures meet user requirements, providing both comfort and energy savings (users can lower temperature settings when not needed or when away, avoiding unnecessary energy waste).