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Hello Cindy, Thanks so much for reaching out. We'll be happy to provide this information. The ratings on the burners are as follows: Burner 1-21000 british thermal units. Burner 2 Rating-5000 british thermal units. Burner 3 Rating-15000 british thermal units. Burner 4 Rating-12000 british thermal units. Burner 5 Rating-9500 british thermal units. Burner 6 Rating-9500 british thermal units. Broiler Burner Rating-12284 british thermal units. On average it takes about 10-20 minutes for an oven to preheat. This is the same when using two ovens at the same time. We hope this helps. Stay well. Mike@Cafe
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