A heating torch (10) for burning a mixture of fuel and air. The heating torch (10) includes a fuel inlet port (12) for supplying fuel from a fuel source to an air entrainment chamber (14). The air entrainment chamber (14) includes at least one air inlet (22) for supplying air from the atmosphere to the air entrainment chamber (14). The air entrainment chamber 14 includes an outlet (26) for discharging from the air entrainment chamber (14) a mixture of fuel and air in a flow path extending from the outlet (26). The heating torch (10) also includes a combustion chamber (28) provided in the flow path A and spaced from the outlet (26). The combustion chamber (28) has an open end (30) facing in a generally downstream direction away from the outlet (26). The combustion chamber (28) includes at least one side opening (36) extending along a side of the combustion chamber (28).