Mr. Heater Natural Gas Vent-Free Blue Flame Wall Heater uses natural convection to circulate warm, comfortable air evenly throughout your room, uniformly providing cozy warmth like your home heating system. No venting, chimney or electricity is required, making this heater ideal for power outages. You also get easy temperature control, thanks to the multi-output valve. Convenient electronic piezo ignition offers simple, reliable starting and the automatic low oxygen shutoff system provides safety. Includes brackets for wall mounting and legs for floor use. Add the optional blower, Item# 52571 (sold separately), to help circulate warmth more quickly and efficiently. Not for sale in California or Canada. Use in accordance with local codes and ordinances. Heat areas up to 1000 sq. feet Uses natural convection to circulate warm, comfortable air throughout the room -- great for family rooms, workshops, basement and other hard-to-heat areas Easy installation with no venting or electricity required, making it ideal for power outages Clean-burning, cost-effective heat Multi-output valve provides easy temperature regulation Convenient electronic piezo ignition for no-hassle starting Automatic low oxygen shutoff system Includes brackets for wall mounting and legs for floor use Requires 6in. clearance from corner and side wall 4,500ft. high altitude restriction Model Number: F299731. Age Group: adult.