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The burner is a crucial component of a hot-air balloon, responsible for heating the air inside the envelope to achieve lift. Modern hot-air balloons exclusively use liquid propane burners. These burners feature vaporizing coils, typically made of steel, which preheat the propane for efficient combustion. For safety and operational redundancy, many designs incorporate multiple burners and fuel supplies, as leaking seals on control valves have historically been an issue. A secondary system can also provide quieter operation by mixing air more slowly without vaporization.12

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