A gas-fueled, portable device for dispensing a heat-volatilizable substance, comprising a. a tank connection means to receive a fuel tank, wherein engagement of the tank with the tank connection means opens a valve in the fuel tank and admits gaseous fuel into a pressure regulator valve, the pressure regulator valve being part of the portable device and operable by a moveable plunger, which is also part of the portable device; b. a valve spring biasing the pressure regulator valve toward a closed position, and a regulator spring biasing a plunger stop against the moveable plunger so as to exert a counter-force that biases the pressure regulator valve toward an open position; c. a valve switch having an off position and an on position, the valve switch being operable by a user and being operably connected to a lever; d. the lever being operably connected to and causing movement of the plunger stop, wherein, when the valve switch is moved to the off position, the lever moves the plunger stop against the bias of the regulator spring to allow the valve spring to move the pressure regulator valve into the closed position, and when the valve switch is moved to the on position the lever releases the plunger stop so that the regulator spring biases the moveable plunger to open the pressure regulator valve against the bias of the valve spring; e. a pressure regulator in fluid communication with the pressure regulator valve, wherein the pressure regulator is responsive to a gas pressure downstream of the pressure regulator valve that biases the pressure regulator valve toward the closed position so as to maintain a predetermined gas pressure downstream of the pressure regulator when the pressure regulator valve is open; f. a fuel combustion means downstream of and in fluid communication with the pressure regulator; and g. a sole plate in thermal communication with the combustion means and having a heated surface upon which the heat-volatilizable substance may be placed; wherein the pressure regulator valve, when open, meters the flow of the gaseous fuel through the fuel combustion means at a predetermined rate, so as to sustain a predetermined rate of fuel combustion which heats the sole plate to a predetermined temperature, the temperature being sufficient to dispense the heat-volatilizable substance from the heated surface. a. a tank connection means to receive a fuel tank, wherein engagement of the tank with the tank connection means opens a valve in the fuel tank and admits gaseous fuel into a pressure regulator valve, the pressure regulator valve being part of the portable device and operable by a moveable plunger, which is also part of the portable device; b. a valve spring biasing the pressure regulator valve toward a closed position, and a regulator spring biasing a plunger stop against the moveable plunger so as to exert a counter-force that biases the pressure regulator valve toward an open position; c. a valve switch having an off position and an on position, the valve switch being operable by a user and being operably connected to a lever; d. the lever being operably connected to and causing movement of the plunger stop, wherein, when the valve switch is moved to the off position, the lever moves the plunger stop against the bias of the regulator spring to allow the valve spring to move the pressure regulator valve into the closed position, and when the valve switch is moved to the on position the lever releases the plunger stop so that the regulator spring biases the moveable plunger to open the pressure regulator valve against the bias of the valve spring; e. a pressure regulator in fluid communication with the pressure regulator valve, wherein the pressure regulator is responsive to a gas pressure downstream of the pressure regulator valve that biases the pressure regulator valve toward the closed position so as to maintain a predetermined gas pressure downstream of the pressure regulator when the pressure regulator valve is open; f. a fuel combustion means downstream of and in fluid communication with the pressure regulator; and g. a sole plate in thermal communication with the combustion means and having a heated surface upon which the heat-volatilizable substance may be placed;