Does the solar water heater need to be drained in winter?

If the solar water heater is not used for a long time in winter, the water supply tap should be closed and the water in the water heater as well as the upper and lower pipes should be drained to prevent pipes from freezing. In sunny weather, the solar water heater can be used normally; When the temperature is below -5°C, it is best to use water from the water heater in small quantities and several times a day. Especially before going to bed, you can connect a basin of water under the nozzle or faucet, loosen the hot water valve a little and let it drip slowly to maintain the water flow in the heater smooth solar water and effectively avoid freezing and blockage of the pipeline. .