... 12L/min - 20L/min: 140mm Water pressure: 0.015 - 0.8 MPa Diameter of gas connector: LPG: 9.5mm, NG ... G1/2" Advantages: Two power systems for choice Water-gas linked automatic control, easy operation; Model of Ignition ... 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 ...