Solar Water Heater 175 liters with vacuum tubes

The family solar installation is only for daily hot water. It provides 175 liters of hot water. This covers the needs of a household compounded of 3-4 people. It is set with an electric heater 1500 Watt, witch allows it to work independently of other energy sources. There are possibilities for a connection with a small electric boiler (if the customer has one). In that way the value of the water is larger and accumulation of hot water in the inside boiler is insured!