... : This system is composed by solar collector, storage tank,intelligent controller, expansion tank and installation parts. 2. Features and advantages about ... : > -40ºC Solar Workstation It inlcudes a multi-function intelligent controller,circulation pump,expansion tank (capacity: 5L,8L,12L,24L), pressure ... Letter of credit(L/C).OEM customized order is avaliable Supply 80L-1500L Solar Hot Water Geysers