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CBO-750 Hybrid Countertop Residential LP CV - 3K With Skirt The Residential Dual Fuel Hybrid Option. The CBO-750 Hybrid Countertop Oven for Outdoor Residential applications includes a two-burner gas system: an infrared burner under the hearth and an ambient burner at the back of the hearth. You also have the option to burn wood at the back or side of the oven to bring Chicago Brick Oven's wood-fired flavor into every meal you make.