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To change over isn’t to bad since the size of the unit is the same. You will not only have to run the gas line to the rear of the stove you will need to convert the 220 line to a 110 volt as a gas stove uses a standard outlet to power the clock and ignition. Why not consider a dual fuel ? this way you can run the gas for the cooktop and still utilize the 220 for the oven. ?