With a Heat Output of 10,000 BTUs this heater is perfect for heating spaces up to 250 sq. ft. No Electricity or Batteries Required makes this the ideal heating solution for Indoor Emergency Use. Features Include: Quick Start Piezo Ignition, Oxygen Depletion Sensor, Safety Tip Over Shutoff, and Swivel Regulator for easy Tank Compartment access. Runs off one 1 lb Propane Tank for a Run Time of 2 Hours on High (10,000 BTU) and 4 Hours on Low (5,500 BTU), or one 20 lb Propane Tank for a Run Time of 45 Hours on High and 79 Hours on Low. CSA Certified for Indoor and Outdoor Use