45,000 BTU Floor Heater Natural GasAffordable solution for large areas with limited floor space. This unobtrusive furnace requires no above the floor space. Natural convection quietly and efficiently circulates warm air. Combustion chamber lifts out for easy servicing. 58% AFUE with70% heats approximately 700 sq. ft. No electricity required; great for backup heat during a power outage Fitted with an automatic floor register grille temperature control Resettable vent limit safety switch