Long-term vacancy will accelerate the aging and damage of solar water heaters.
When there is no water, the solar radiation received by the water heater will not be reduced at all. As the temperature of collector tubes, water tanks and brackets increases, their joints, other plastic parts and insulation layers will be baked at high temperatures and their aging will be accelerated even the aging of aluminum-plastic tubes empty. the water will be accelerated.
The damage caused by the vacancy is considerable. This will cause two problems. First, it increases the cost of subsequent repairs. Second, some damage is not easy to detect and some damage is difficult to repair. In summary, the installed water heater must be used normally; water that has not been used for a long time and has been heated repeatedly can be drained and then used. The most taboou solar water heaters is to leave them vacant for a certain time; long duration.