20,000 BTU/hour of blue flame convection heat with built in thermostat. Automatic low oxygen shut-off system (ODS). Legs and optional wall mounting hardware included. Electronic ignition system. 4500 ft high altitude restriction. This heater requires a hose and low pressure regulator assembly to operate free standing (see our inventory of hose and regulator assemblies in various lengths). Wall mount units require a hook-up kit Part# F271239 for installation and must be piped to low pressure system! Optional fan not included. Not approved for use in California or Canada.