catalyzer or immersed under vacuum instead of the spraying method earlier mentioned in the embodiment shown in fig9 to 14 opening the needle valve 153 to a desired degree causes a flow of liquefied gas 150 therethrough to the separator 117 from which a vaporized state of gas flows to the mixing portion 155 where it is mixed with fresh air through air holes 104 the air gas mixture being then jetted from the outlet 163 into the combustion chamber 102 at this moment depressing the trigger 161 actuates the piezoelectric element 160 to develop a voltage across the ignition heater circuit the current from the piezoelectric element 160 jumping electrical sparks between the ignition plug 163 and the combustion chamber 162 the sparks thus jumped ignite the air gas mixture on the instant under the oxidation reaction promoted by the catalyzer carrier 106b of the quick combustion promoting character in the chamber 102 the heat produced by burning the gas conducts through the rod 108 to its tip 146 while the carrier 106a in the chamber 102 can help the tip 146 to be further heated to a sufficient temperature for soldering for example as the temperature in the chamber 102 rises the catalyzer in the carrier 106a contributes to the further burning of the gas to higher temperatures even though there is a temperature rise in the chamber 102 on the other hand the heat resistant catalyzer in the carrier 106b can make the surroundings resist or protected from the rising temperature heat allowing the.