1. The water supply and drainage pipelines freeze in the harsh winter. 2. The weather is too cold. 3. No insulation. At this point, the distributor can insulate the pipeline or use electric antifreeze tape (plate) to heat the pipeline. In addition, there are techniques to use: first, empty the water tank after using hot water at night, and fill it with water the next morning. Secondly, on the coldest days of the night, open the hot water valve and slowly drip hot water to prevent freezing. Nowadays, many manufacturers emphasize winter usability as the standard in their design concepts, and solar water heaters with insulated water tanks are also becoming more and more user-friendly in winter. In fact, whether the main unit of solar energy malfunctions or other electric heating belts or auxiliary electric heating systems have problems, it is necessary to hire professionals to repair them. It is also recommended that users choose manufacturers with strong capabilities when purchasing solar energy, as their after-sales service is guaranteed.