8l Natural Gas Tankless Boiler Stainless Instant Endless Hot Water Heater Heat Load: 16KW; warm water producing rate: 8L/min ( 8kg/min ); Gas Type: Natural Gas. Rate Gas pressure: 2000Pa; Fire Catching Ways: Electricity pulse automatic fire catching. Discharge Ways: Flue automatic gas discharge; Diameter of gas discharge pipeline: 8kg F100. Applicable water pressure: Zero pressure starting; Gas pipeline : F 12mm metal tube. Cold/Warm water pipeline: Short/Long pipeline equipped or G 1/2 steel tube.