solar electrical heater can has the thermostat to control
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you can have the hot water in cold winter or rain day.
it has a thermostat you can cut of f the electrical power for fine hot.
Solar Electrical Heater
Working principle:
Therer has a hole for electrical hole in the water tank;one kind of electrical heater has a thermostat which can control the electrical heater.Its operation temperature is 45Celsius degree to 65Celsius degree.The other one electrical heater has no thermostat,so you will cut of the electrical power when the temperature I favorable.