Gas water heater: Model No.: JSD12-20-02 Rated input: 12KW-20KW Rated hot water output: 6L/min-10L/min (25 degrees centigrade rising) Rated gas pressure: 2800 Pa (LPG), 2000 Pa (NG), 1000 Pa (Town gas) Water pressure: 0.015-0.8 MPa Ignition way: Automatic impulse ignition with batteries Diameter of gas connector: LPG: 9.5mm; NG: 12-15mm Diameter of cold water connector: G1/2" Diameter of hot water connector: G1/2" Diameter of chimney: 110 mm. Product size: 590*340*140mm Packing size: 710*400*205mm.