Outdoor Order designs some of the most cutting edge outdoor heaters on the market today. Their design philosophy focuses on form and function. They have procured the finest materials and most advanced technology to power their outdoor heating products. Borosilicate glass, 304 grade stainless steel, cold-rolled aluminum just to name a few. These are just a few reasons Outdoor Order are able to offer an industry best 3-year warranty on their entire line of comfort products.