I have been using this solar water heater since 3 year it’s been working very well it’s evacuated glass tube solar water heater it’s a new technology earlier I was using flat plat solar water heater which was not convince to use because blockage of copper pipes were having every now and then but this v-guard system is totally maintain ace free. the price of this system is high but quality of the system is better because they are using ss thank instead of using GI tank which provides better durability