... intelligent control and automatic operation. It is composed by pressurized solar collector, storage tank, controller, working station and installation parts, ... red copper pipe channel Electrical heating connection(inch): ¾ or 1¼Water connection(inch):½ or ¾CT-S010: no coiler; CT-S011: ... pump (WILO), expansion vessel, piezometer, and flowmeter).2.Electrical Heater (as back-up for cloudy or rainy day)