Storage water tank with heat exchanger Heat exchanger: Diameter 16mm 25mm Good price, strong warranty 100-750L Storage water tank with heat exchanger 1. Inner tank: ... Electric element: 1500w-3000w About 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 warranty ...