... advantages: 1) CE, CCC, ISO9001: 2000, CNAL2) Good price and quality 3) Prompt delivery 4) Environmental Protection 5) OEM order ... decent appearance5.Certificate: CCC, CE, ISO9001,CNAL6.Long life span and no extra cost after installation7. Easy opearationMaterialInner tank: stainless steel ... without any sunshine, consumer can enjoy comfortable bathe anytime. 200L bathroom solar hot water heater