Commercial Gas Fired Water Heater NG Fuel NG Net BtuH I-B-R 282 000 BtuH Input 399 000 Ignition Type Electronic Spark Input (BTU) 399 000 Gas Connection 3/4 In. Burner Cap (GPH) 284 Burner Cap 284 83.0 AFUE ( Percent) Pipe Size Return (In.) 1-1/2 AFUE 81 Percent Pipe Size Supply (In.) 1-1/2 Pipe Size Return 1-1/2 In. Pipe Size Supply 1-1/2 In. Gas Connection (In.) 3/4 Width 35-3/8 In. Height (In.) 32 Depth 25-1/4 In. Width (In.) 35-3/8 Height 32 In. Depth (In.) 25-1/4