Water tank is open onto the atmosphere. The pressure of water surface is equal to the atmospheric pressure at any time. The vacuum tube absorbs the energy of the solar radiation, and transfers it to the water in the vacuum tube. Obtaining the energy, the temperature of water is increased, and the density is decreased. So the hot water will rise, and the cold water in the water tank will supplement the vacuum tube. And this makes the temperature of the tank¡¯s water increase continuously, which can accomplish the target of the heat collection.Himin solar water herters have different heat capacity and satisfy the needs concerning bath and other hot water requirements. The support is designed with an overall industrial model, which is simple, direct and stable. The glass vacuum tubes with special effect has the patent of interferential film coating technology, thus increasing the heat collection performance by 12% compared to normal pipes and bearing more stable performance. The equipment has extra thick and extra strong heat preservation layer and the fully automatic constant-temperature and high-pressure quantitative foam. The heat preservation performance is endurable and steady. Solar E control equipment is adopted together with VFD display and control facilities to realize the automation and intelligence of hot water supply.