it can be seen from the above picture that the water heater has been used for a long time and is seriously corroded. If the solar energy is normal (the temperature rise of vacuum tube heating is not much different from that when it was just bought), you can continue to use solar energy for heating. If the solar heating speed is obviously lower than before, and considering the corrosion of water tank and bracket, it is recommended to replace the solar water heater.
if there are no serious problems in other places, open them for inspection. First, determine the temperature of the water in the solar energy, and make sure that it is not high temperature (to prevent scalding during disassembly), and let all the water in the solar energy go. Remove the electric heating tube and replace it. There are two ways to fix the normal electric heating tube. One way is to fix it through the sealing ring, and there is no screw to specify the heating tube; One is fixed by screws; Screw-free fixation can be forcibly pulled out; Those with screws are opened by screws. Check the sealing ring. The sealing ring should be broken due to water leakage. Remove the sealing ring and buy a new one. At the same time, check whether there is scaling on the electric heating rod. If scaling is serious, it is recommended to clean or replace it. If the scaling of the electric heating rod is serious, the scaling in the vacuum tube should also be serious. According to the situation, find a professional solar installer to clean it.
in order to reduce the risk, if the frequency of electric heating is not high, the electric heating can be removed and the electric heating hole can be blocked with a plug.