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Thermal Efficiency 93%/Biomass Hot Water Boiler. High Thermal Efficiency: Achieves 93% thermal efficiency with advanced combustion technology. Enhanced Water Output: Water production rate is 18% higher than similar industry products. Advanced Combustion System: Utilizes trapezoidal fixed grate and side-blowing air for semi-carbonization. Comprehensive Safety Protection: Features automatic water adding, pressure control, and over-pressure safety valve. Smart Automation Control: Intelligent oxygen sensor adjusts feeding for optimal energy saving. No Certificate Required: Water volume under 30 liters exempts from boiler safety supervision approval. Long Service Life: Boiler lasts over 20 years with proper operation and maintenance.