... variety of metals coatings, more stable and durable, heat conduction is more rapid. Super-vacuum insulation tank ... foam, green, super-vacuum insulation tank, effectively blocking heat dissipation, the use of food grade stainless steel, ... 40 degrees Celsius, to avoid the cold and hot water because of the frostbite or burn users. Anti ... adapt relatively harsh climate.... Diamond Tianjiao Solar Water Heater