... can be used under the conditions of powerful electric current for a long time. Otherwise, it should be changed.3, ... to five minutes, connect to the power to go on heating.5,The set maximum temperature of our product is about 70 ... line, because it is exposed to wind, rain and sunshine. (For example, when electricity can’t be sent in rainy days ... . HY-4 HY-1 Solar water heater spare parts for heating