Model A1TS Big 60 Built-In GrillStainless Steel A1TS Big 60 Overview The heart of the A1TS Big 60 Utility Stove is a huge, 10 diameter, cast iron burner. This 3 ring low pressure burner is far superior to the burners used in high pressure pot cookers and is able to produce and accurately control a 2,000 to 60,000 BTU heat range. The A1TS Big 60 stands alone in its ability to simmer, boil, saute, stir fry, steam, and deep fry. Type 304 StainlessSteel housing. Inner burner 10,000 BTU.