Rated input: 10KW, 12KW, 14KW, 16KW, 18KW, 20KWRated hot water output: 5L, 6L, 7L, 8L, 9L, 10L (25 centigrade temperature rising);Gas type: LPG, NG, Town GasRated gas pressure: 2800 Pa (LPG), 2000 Pa ( NG), 1000 Pa (Town gas);Ignition way: automatic impulse ignition by battery power or electric transformer power;Diameter of chimney: 5 L- 8 L: 90mm, 9 L - 10L: 110 mmWater pressure: 0.015 - 0.8 MPa