... operation 14 years manufacturer of 200/250/300 liter compact solar water heating with CE,CCC,Keymark ... SUS304 stainless steel,47 evacuated tube solar water heate 460mm insulating layer55mm 45kg/m³ high ... tank:4 holes for exhaust port, overflow, water inlet and outlet, electric heater is optionWelding:Argon ... OEM 14 years manufacturer of 200/250/300 liter compact solar water heating with CE,CCC,Keymark