Solar high pressure vacuum system is popular in Chile market. The integrated pressure-type solar water heater utilizes the high solar absorption ratio and the low emission ratio coating of the vacuum tube to convert the absorbed solar radiation into heat energy, and is quickly transferred to the water tank through the phase change copper heat pipe inserted in the vacuum tube. The water temperature in the entire tank is gradually increased. The vacuum tube has the ability to naturally track the sun. Only the solar auxiliary beam can work. The phase change heat pipe has the one-way heat transfer characteristics, and even in the alpine region, it can operate efficiently all the year round.
Also in Western European market, it is popular.
Solar high pressure vacuum system has no exhaust hole, therefore, it must bear the pressure came from tap water and hot water, when use, the hot water comes out because of water pressure.