With the rapid development of science and economy, solar water heaters have become the indispensable household items in daily life because of their energy saving, environmental protection, safety, efficiency, and economic benefits. Nowadays, most of the market is vacuum tube solar water heaters. With the influence of time, water quality, air and other factors, the system performance of solar water heaters will also be degraded. Regular maintenance, to maintain the solar collector's heat collecting performance is also the vacuum tube. The heat collecting performance plays an important role in ensuring the normal and efficient use of solar water heaters and prolonging the service life.