Atmospheric direct-fired steel module boiler gas cut-off protection device. The gas pipeline is equipped with a high-pressure switch and a low-pressure switch. When gas is cut off or the gas pressure drops to a certain value, the low-pressure switch closes, and the system self-locks; when the gas pressure is too high, the high-pressure switch closes, and the system self-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 starts. Zoned temperature control system (user optional): The automatic control system of the gas module boiler is equipped with an automatic room temperature control device for users. A temperature controller is installed indoors to manage the operation of solenoid valves and the boiler within the system. When the user sets a specific temperature, if the room temperature falls below the set value, the controller sends a signal to the boiler, which automatically starts, and the solenoid valve opens to begin supplying heat. If the room temperature exceeds the set value, the controller signals the solenoid valve to close, stopping heat supply. When solenoid valves in all zones are closed, the boiler automatically shuts down. This system ensures that the indoor temperature meets user requirements, providing both comfort and energy savings (users can lower the temperature setting when high heat is unnecessary or when they are not indoors, avoiding energy waste). Shaanxi Deli Energy developed cast iron gas module atmospheric hot water boilers, with national patent numbers 201320778345.0, 201310632249.X, 201320784596.X, 201320778344.6, and 201320784600.2. These are innovative products with independent intellectual property rights that lead international standards. The core components feature a uniquely developed high-quality cast iron movement mechanism, ensuring a service life of over 50 years and adaptability to various user needs. Multiple units can be combined in parallel, leveraging the advantages of modular design to achieve fully automated startup,輪流休息, and unmanned operation based on heat demand. The boilers have strong fuel adaptability, supporting natural gas, liquefied gas, coalbed methane, biogas, and other fuels, fully addressing gas source and type shortages in various regions. They can be integrated with central air conditioning, solar energy, and underground heat sources for complementary heating, widely used in residential communities, shopping malls, villas, hotels, spas, schools, and hospitals for heating and domestic hot water supply. These multifunctional devices are energy-efficient, highly efficient, quiet, environmentally friendly, and pollution-free. Fandel gas module boilers feature staged startup, significantly enhancing energy savings. The gas boiler module system uses a staged startup function to automatically adjust the operation of module boilers based on the system's heat load. When each module boiler reaches full capacity, another module is activated, ensuring that the system's heat output always matches the actual demand. This guarantees that each boiler operates at high efficiency, maximizing the overall system's thermal efficiency and徹底 solving the energy waste issues associated with traditional large boilers. Simultaneously, the control system automatically balances the operating time of each module, extending the overall system lifespan. In summary, the Fandel gas module boiler series represents a breakthrough in design concept and form compared to traditional boilers. This series offers unparalleled advantages in environmental protection, energy efficiency, safety, automation, lifespan, installation, power consumption, capacity expansion, footprint, and space requirements. It has been widely applied in various new and renovated heating and hot water projects.