... 25mm Good price, strong warranty 100-750L Storage water tank with heat exchanger1. Inner tank: 1 ... 750L5. Electric element: 1500w-3000wAbout Us:Jiangsu Sunpower Solar Technology Co., Ltd1. Leading exporter: more than 500000 ... ......3. Various certificates: ISO, EN12975, EU CE, Solar Keymark, Kang-Ju, KOLAS, SABS, SRCC4. Strong ... control and aftersale service. Storage hot water tank with heat exchanger