1, the joint resistance seam welding with high frequency to ensure that leakage is not easy to rust; 
 2, using SUS304 stainless steel plate, light weight, good looks, clean and sanitary; 3,50 mm imported polyurethane foam layer, heat loss, thermal insulation effect is good; 
 4, applies to solar water heating systems, heat pump hot water system, fuel water heaters and insulation needs a place of liquid