1.Heating area :300/600/1200 square meters . 2. Stainless steel burner , heating efficiency amount to 90%. 3. Stainless steel heat exchanger has adopt 321 (1Cr 18NiTi) stainless steel tube . 4. Double wind input and output . 5. Italy–imported Riello burner : Automatically control the temperature . 6. Adopt designing of heat –preservation and heat –insulation systems with the lowest heat wastage . 7. All the targets are have met the national environment protection standard .