... , 6 L/min, 7 L/min, 8 L/min, 9 L/min, 10 L/min, 12L/min, 16L/min, ... Diameter of chimney: 5 l/min - 8 l/min: 90mm, 9 l/min - 12 l/min: 110 mm; 12L/min - ... pressure: 0.015 - 0.8 MPa Diameter of gas connector: LPG: 9.5mm, NG: 12-15mm Diameter of cold water ... freezing protection device; Super low water pressure starting design Gas Water Heater, Instant Tankless Water Heater, Natural Gas Water Heater