Mr. Heater 30,000 BTU Blue Flame Dual Fuel Vent Wall Heater is a versatile heating solution that operates on natural gas or liquid propane, providing efficient warmth without the need for ventilation or an outside duct. This vent- heater delivers 99% efficiency and includes an oxygen depletion sensor (ODS) for enhanced safety. Designed to heat the air in the room first, the blue flame technology circulates warmth evenly throughout your space, similar to a central heating system. It requires no electricity, making it an i choice for use during power outages. The unit features a convenient push-button piezo ignition for easy start-up and measures 9.75 inches wide by 27.5 inches long by 25.25 inches high, capable of heating areas up to 1,000 square feet. Model Number: