... ,ROHS,CCC ISO9001:2000 2.offer OEM 3.15years warranty 4.AntifrezzeDetailed Product Description: 1) Inner tank material: SUS304-2B stainless ... , 26, 28, 30 and 36pcs, over 15 years service life.4) Insulation layer: High density polyurethane foam, thickness: 50mm. available thickness ... protection:-25 degree. 11)Heat preservation:72hours 200L non-pressurized compact solar water heater