1.Colorful-steel shell with dun color is more corrosion resistant against ultraviolet radiation, moisture and other climatic factors
2.Enamel Tank
3.Non-fluorine Polyurethane Foaming Insulation Layer
4.Protection against dry heating / Over-temperature/ Electricity leakage                                                    
5.With "RMC" pressure and temperature relief valve
6.Heating element with "KAWAI" brand(Japan).