DYNA-GLO WORKHORSE SERIES 40000 BTU PORTABLE PROPANE GAS FIRED HEATERS ARE A SIMPLE YET EFFECTIVE HEATING SOLUTION FOR AREAS JUST UNDER 1000 SQUARE FEET. THE SURE-FIRE PIEZO IGNITION SYSTEM COUPLED WITH OUR EASY-CONNECT REGULATOR AND HOSE ASSEMBLY MAKES SUPPLYING AND STARTING YOUR HEATER EFFORTLESS. FEATURES ADJUSTABLE HEAT ANGLES TO DIRECT THE HEAT WHERE YOU NEED IT MOST. LOW PRESSURE SYSTEM ALLOWS FOR CONSISTENT BTU'S IN THE COLDEST OF TEMPERATURES. RUN TIME IN HOURS VARIES PER TANK SIZE AND HEAT SETTING FOR 20 LB. TANK 11 HRS. FOR 40 LB. TANK 22 HRS. AND FOR 100 LB. TANK 54 HRS. (LP TANK SOLD SEPARATELY). NOT FOR USE IN RESIDENTIAL LIVING AREAS OR IN INADEQUATELY VENTILATED AREAS. PROPER VENTILATION REQUIRED DURING OPERATION.