KBX1000N-M13 KNIGHTÛXL' HIGH-EFFICIENCY CONDENS-STAINLESS STEEL 999MBH INPUT-969MBH OUTPUT M-13 FIRING CODE: CSD-1, FM, MOD BURNER W/10:1 TURNDOWN * ASME CERTIFIED "H" STAMPED ADJ H LIMIT W/ MAN RESET 50 PSI ASME R VLVE / FLOW SW TAG:B-1