... water parts . OEM&ODM . 5 years warranty . CE,SRCC,SGS,ISO9001:2008,Solar Keymark Solar Water Heater Accessory Electrical Heater 1. ... Description:This kind of electrical heater (quartz directly insertion electrical heater) is usually used ... also use a controller to control the electrical heater. Copper Header pipe Solar water parts(CE, ISO9001)