Solar water heater electric heater is backup heating for water tank while there is cloudy or less solar energy situation. For solar water heater use, there is always a thermostat design in the heater.

There are several types of solar water heater electric heater for the different design tank:

1.      Directly plug (no thread type) solar water heater electric heater : It is sealed by silicone ring installed in the tank. This type can be only used for non-pressurized solar water heater tank. The thermostat setting temperature valve: 75degree.Once the temperature reaches, it stops working. It is a protection device. Not a regular working device.

It has different size  , size in 22mm  ,47mm,58mm. Power : 1.5KW

2.      Thread type solar water heater electric heater : It has fitting in thread to connect to the tank. Size : 3/4’’  1’’   1 1/4’’.

The size 1 1/4’’ is specially with adjustable thermostat .It is now commonly used in our resident solar water heater.

3.      Flange type solar water heater electric heater : The head is flange design. It is widely used in coating inner tank such as Enamel water tank. Size depends on the inner tank design. It always design with a magnesium bar with electric heater.

For above solar water heater electric heater ,the material is stainless steel. There are several different stainless steel : SUS304 ,316L, incoloy 800 . The material incoloy 800 is the best quality for highest nickel contents.  It is widely used for the terrible quality water situation.

Some tank may need adjustable thermostat to setting different temperature, following is some thermostat for your optional .

Round type thermostat                square type thermostat

 20A   sensor 270mm                   20A sensor 180mm