Mr. Heater 20,000 BTU Blue Flame Dual Fuel Vent Wall Heater is a versatile and efficient heating solution designed to provide warmth without the need for venting. This vent- heater operates on either natural gas or liquid propane, making it adaptable to your fuel preferences. With a remarkable 99% efficiency and an oxygen depletion sensor (ODS) for enhanced safety, it ensures reliable and safe operation. The blue flame technology heats the air in the room first, distributing warmth evenly throughout the space much like a central heating system. Its push-button piezo ignition allows for an easy and convenient start-up, and since no electricity is required, it’s i for use during power outages. Compactly designed to measure 18.46 inches wide, 24.1 inches high, and 8 inches deep, it effectively heats areas up to 700 square feet, making it for a variety of indoor spaces. Model Number: