Zu How hot water boilers are fully automatically controlled. They are easy to operate and corresponding to 24hrs smart timer. The boiler is designed with a special body, featured with high efficiency, effective heat insulation and fuel conservation. The boiler body is fully galvanized to prevent rusting, which, ensures no rusty water. Zu How hot water boilers have high efficiency, effective heat insulation and fuel conservation, and are a great helpers for industries that require hot water.