... heater----------------------------------------------Inner tank:Food grade SUS304/2B stainless steel with optional 0.31mm, 0.35mm, 0.40mm, and ... insulating layer: Improved polyurethane integral foaming with 50-65mm thick.Bracket:Galvanized steel with 1.50mm thick.Or stainless steel SUS304 ... /2B with optional 0.31mm, 0.55mm, 0.88mm, 1.10mm thick ...