Never worry about electricity outages keeping you without hot water. This thermal water heater system from Eagle Sun pairs an 80 gallon tank with a 64 square foot collector. The water is heated by hot water passing through the storage tank. The closed loop design keeps the water sources separate. The system is also equipped with a drainback feature that empties the heating water during low use or when a maximum temperature has been reached. System is built for warmer climates where freezing temperatures are rare.