Hi, My name is Luong Ta, I have a questionI got the Chromagen 200 litre and G20 Eternity system on the top of cylinder plus one solar panel on the roof. I am not happy with this system as two many problems, this time the problem is the circuit in the G20 Eternity box failure, it is not start to burn the gas (this system only 8 years and 4 months)Now I would like to know can i change to another brand of the solar hot water with similar system? and i would like to know the payment plan too.