Required.
There is a lot of water in the solar water pipe. When the weather is very cold, it will freeze, the volume will increase, causing the pipe to crack and leak solar water.
Drain all water from solar power. When the weather is good and the sun is strong, the solar energy will be able to dry out, making the temperature inside the vacuum tube too high, causing the vacuum tube to be blown out. It will also damage the performance of solar energy and shorten the lifespan of solar energy. Therefore, the solar water heater must discharge water when it is minus 15 degrees.
Ten degrees below zero.
Solar water heaters should be drained during cold winters, especially when the temperature is near or below minus ten degrees. Indeed, at extremely cold temperatures, water can freeze in pipes and collectors, causing them to burst.ent or damage to the pipes. By draining the water, you can prevent your solar water heater from being damaged by freezing.