This can be done inside on the stove or outside on a propane burner or fire pit for a larger volume.

His balloon flew untethered for 1 hour and 35 minutes (1:35) with the aid of heat generated by a propane burner.

The university claimed that the camp was a fire hazard because of two propane burners used to heat food.

The propane burners are ignited periodically to keep the balloons inflated with hot air.

Attractive aspects of ballooning include the exceptional quiet (except when the propane burners are firing), the lack of a feeling of movement, and the bird's-eye view.