1. Assistant tank: It's using for filling up tap water into the main water tank. Assistant tank is installed at the air vent hole of the water tank. The working principle is same as toilet system ( lavatory ), there's a small ball inside the assistant tank, if the water is full inside the water tank, the small ball is going down to stop fill up water.
 
2. Mg sacrifice anticathode: This part is using for making the hard water to be soft. There're some countries has bad quality tap water, it's too hard and it may damage the inner tank after few monthes or one year, so people using it to make the tap water to be soft and the life span for the solar system is longer and the hot water quality is good. ( if your client's country's water quality is good, he doesn't need to use this part )
 
3. Glass electric heating bar: It's using as a back up heating system. It's going to heat the water in the water tank during the cloudy day or rainny day when the solar system doesn't work under the bad weather condition.
 
4. Intelligent Controller: It has few functions as following:
 
a) It shows temperature of the hot water in the water tank on the controller screen.
 
b) It shows the water level on the  controller screen.
 
c) It's controlling electric heater to heat the water when solar system doesn't work.
 
d) User can set up the temperature of the hot water what they wanna use on the controller. For example, if user set up for 40 degree C, so if the water less than 40 degree C, the solar system or electric heater will start to circulating the water until the hot water is more than 40 degree C.
 
e) It's controlling to fill up tap water into the water tank.
 
If user using controller system, they don't need using assistant tank, if they using assistant tank, they don't need to use controller. People use the controller because it's much more intelligent and people use the assistant tank because it doesn't need any electricity ( so for those area without electricity supply, they should choose assistant water tank instead of intelligent controller) and it's much more easier for installation and using.