The weather is getting colder and colder, and many people's solar water heaters are no longer used. However, if the antifreeze measures are not done, in the winter, the components of solar water heaters are likely to be frozen. For example, if the pipeline is not well insulated, Pipe bends, over-walls and other parts are particularly easy to freeze, and even cause cracks and leaks to form waterfall ice. Since solar water heaters are generally installed on the roof, water leakage and icing will cause the appearance of the building. Destruction, causing trouble for other households.