Square Flame Liquid Propane Patio Heater. The new Square Flame LPG Patio Heater brings a new dimension to outdoor heating. This stylish unit provides a uniquely visual flame while providing heat of 41,000 BTUs in every direction. Its an attractive piece of patio art with the stainless steel burners and heating grid will be the focal point of any outdoor setting. Other than being a high quality unit, it also features a safety auto shut off tip over protection system for your safety. The Square Flame LPG Patio Heater has a reliable electronic starter and uses the standard 20 lb. LPG BBQ tank (not included), consumption rate (approx) 10-12 hours. Two attached rubber wheels (2.5"x2.5") provide easy mobility. One AAA battery is needed for the ignition button. Battery not included. Dimensions: 18.91" L x 18.91" W x 88.3" H Weight: 67 lbs.