Use the sun to heat your homes water for free with a thermal water heating system from Alternate Energy Technology. This system includes a 120 gallon tank connected to a 64 square foot solar collector to provide plenty of hot water. The water is heated while flowing through the drainback reservoir at the same time the heating awter passes through the drainback reservoir. The closed loop design never allows the two water sources to mix. System is built with a drainback reservoir allowing it to bo used in colder climates.