Features Optimized configuration, performance and stability. The water tank host combo, heating up fast, consume less heat, double ensure safety. . Number of protection, over-current, over-voltage, high and low leakage power and other security protection. Lines are beautiful, noble Athens, the overall design, do not take up space for installation. Installation is simple and does not require installation of water pipes between the tanks and the host, the whole installation without increasing the cost of installation. . Several appearance, freedom of choice. . Constant hot water, dual power guarantee.