Century Sun high pressure compact thermosiphon systems are systems which producing hot water from solar based on the principle of nature circulation between cold and hot water.The advantage of this system is that it avoids using a conventional pump.The thermosiphon systems are available in two types and each type has three designs.The basic type features a flat plate collector and advanced type features a heat pipe vacuum tube collector.For both types,all necessary pipes,fittings and freeze protection are included with delivery.