Three settings, Oxygen Depletion System (ODS), No electricity required, Matchless piezo igniter, 100% fuel efficient, Versatile wall mount or free standing, no floor stand needed, Not for high altitude, Blower assembly 511307 sold separately, 16,500 BTU/Hr, Liquid Propane Gas, Size: 21-3/4"" H x 18-3/4"" W x 8-3/4"" D, SKU: HMREX1536