I. Advantages of Vandele Gas Fully Premixed Condensing Low-NOx Variable Frequency Boiler 1. Low NOx and Eco-friendly: NOx < 8mg/m3, ultra-low CO, nitrogen oxides 2. High Energy Efficiency: Net hot water efficiency 103%–108%, overall operation exceeds ordinary boilers by over 30% 3. Quieter Operation: Built-in burner, surface combustion technology, low noise 4. Long Lifespan: Designed lifespan of 30 years, more than double that of ordinary boilers 5. Compact Size: A 770kW boiler is only the size of a refrigerator, occupying just 1.2㎡ 6. Fast Operation: Small water volume, instant heating design in one second 7. Enhanced Safety: Equipped with sensors related to safe operation 8. High-Tech: Fully premixed metal, surface combustion technology 9. Superior Craftsmanship: Leak-free during long-term use, high overall structural strength 10. Greater Flexibility: Modular design, multi-unit linkage control 11. Strong Adaptability: Suitable for various working conditions with low-pressure gas 12. User-Friendly: Simple operation, intuitive smart display 13. DC Variable Frequency: Precise variable frequency gas input based on the load fan II. Vandele Gas Fully Premixed Condensing Low-NOx Boiler: High-Efficiency Heat Exchanger, Long Lifespan, Rapid Heat Transfer 1. High Heat Exchange: Utilizes high-efficiency heat exchange design, large heating surface layout, long flue gas path combined with multi-pass heat exchange and latent heat recovery technology. Small water volume enables instant heating in one second with extremely high thermal efficiency. 2. Long Lifespan: Made of alloy steel, oxidation-resistant, stronger resistance to acid and alkali corrosion than copper or lead, specially treated to prevent scaling. Lifespan exceeds 30 years, whereas large boilers last only 10–15 years. If using large boilers, replacement is required after 15 years. When factoring in operating costs, modular boilers save 30%–40% or more in annual investment costs compared to cast lead, copper, cast iron, and steel boilers. 3. Quieter Operation: Built-in burner acts as a soundproofing device. Metal fiber surface combustion involves micro-flame combustion, significantly reducing combustion noise and flue gas noise. 4. Enhanced Safety: Sealed combustion, no open flame, protection against airflow interference. Comprehensive safety features including gas pressure, air pressure, water flow, and flame monitoring. Intelligent self-diagnostic system with remote monitoring capability. 5. Smarter Operation: Intelligent controller with LCD status display, button-based simple and reliable operation. Compatible with various communication protocols, connectable to upper computers and remote communication devices.