It is a pressurized solar water heater that utilizes the high absorption ratio and low emissivity of the solar vacuum collector tube to convert the absorbed solar radiant energy into heat energy, which is inserted into the vacuum tube. The phase change heat transfer of the superconducting heat pipe quickly transfers heat energy into the water tank, gradually increasing the temperature of the entire water tank. The solar vacuum collector tube has the ability to naturally track the sunlight. As long as there is solar auxiliary radiation, the vacuum tube can collect heat immediately; because the phase change superconducting tube has one-way heat transfer characteristics, even in the alpine region, it can run efficiently all the year round