... CE certified 3.Using wood stress ,quality assurance Flat solar water heaters 1).Heat collector machine size: Φ47--1500, Φ58--1800, Φ70 ... --2000.etc(2).Outer water shell: Imported High quality Stainless steel,Pearl board,White-color ... painted board,Galvanized steel plate(3).Inside water chest: imported BS SUS304-2B stainless steel (food class).(4 ...