Compact Pressurized Solar Water Heater SystemFeatures:Heat pipes are installed inside the vacuum tubes. As there's no water flows inside the vacuum tube, the tube will not be crack under cold weather condition, which is much more safe and reliable. Operate automatically with nature tap water pressure, so water is supplied under a pressure with more comfortableness for bathing. Its installation siteis free from limitation.This system is equipped with auto. electric heating element, offering hot water safely even in cloudy or rainy days.Breakage of one tube will not influence the operation of the whole system. The inner tank is made of SUS304, the thickness of the inner tank is 1.2mm. Or using SUS316, more anti-corrosive and longer in lifespan.The T/P valve will keep it much more safety in operation. Model Dia. of tube(mm)Length of tube(mm)Quantity of heat-pipe with vacuum tube(pcs)Capacity(L) For people(no.)FYCP-1800/58-12581800121002-3FYCP -1800/58-15581800151503-4FYCP -1800/58-20581800202004-6FYCP -1800/58-24581800242507-8FYCP -1800/58-30581800303009-10