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Without a proper preheat, these materials will collect on both the flame spreader and the burner tubes resulting in partial or total loss of ignition or a decrease in burner performance. Always light every burner to generate maximum heat output and to assure even heat distribution. Using only one or two burners can eventually result in a buildup of unwanted material and could affect performance. NOTE: In colder climates the infrared burner may have to be used in order to achieve the suggested pr