The Weber Summit S-450 is one of the four S-400 models in the Weber Summit Stainless Steel Series. The S-400 models, including the S-450 grill, offer 4 stainless steel burners, whereas the S-600 models offer 6. They share most of the features, but some are different. The S-450 makes a terrific grill for your patio or backyard and can prepare food for a large group of people. Some of the features include 48,800 BTU-per-hour input, a 12,000 BTU-per-hour input flush-mounted side burner, a 8,000 BTU-per-hour smoker burner and stainless steel smoker box, and many others.