... , 7 L/min, 8 L/min, 9 L/min, 10 L/min, 12L/min, 16L/min, 20L/min (25 ... : G1/2" Advantages: Two power systems for choice Water-gas linked automatic control, easy operation; Model of Ignition Methods ... accident. Water over high pressure protection device; Over freezing protection device; Super low water pressure starting design Gas Water Heater, Instant Tankless Water Heater, Natural Gas Water Heater