... copper or SS304 5 years warranty 50-750L Solar boiler with copper coils 1. Inner tank: 1.5- ... on the basis of OEM. About Us:Jiangsu Sunpower Solar Technology Co., Ltd1. Leading exporter: more than 500000 ... tech support......3. Various certificates: ISO, EN12975, EU CE, Solar Keymark, Kang-Ju, KOLAS, SABS, SRCC4. Strong warranty: ... have strict quality control and aftersale service. Solar boiler with coil