Water heater, switch to natural gas, capacity of 5.5 liters per minute, natural draft, adjustable temperature and indicator display to view the water outlet temperature and operating information. Automatic operation, does not require an evacuation duct, easy-to-use knobs to control the water temperature and save gas, it also has a flame viewer to observe the operation of the burner, a security system and a timer that turns off the heater after 20 minutes of continuous use.