Mr. Heater MH9BX 4000-9000 BTU Portable Buddy Heater
Safe for indoor use, it's the perfect way to heat small enclosed spaces up to 225 square feet. 4,000 or 9,000 BTU per hour. 4,000 or 9,000 BTU Output. BTU per hour: 4,000/9,000. At Maximum BTU: 3 hours.