... , 16KW, 18KW, 20KW, 24KW, 32KW, 40KW. Rated hot water output: 5 L/min, 6 L/min, 7 L/min, 8 L ... way: Automatic impulse ignition with batteries & electricity; Diameter of chimney: 5 l/min - 8 l/min: 90mm, 9 l/min - 12 ... high pressure protection device; Over freezing protection device; Super low water pressure starting design Gas Water Heater, Instant Tankless Water Heater, Natural ...