a heater includes a handle , a combustion chamber , a valve and a thermal controller . a reservoir for fuel can be installed in the handle . the combustion chamber is mounted on the handle . the valve is received in the handle . the valve defines a passage through which fuel can flow from the reservoir into the combustion chamber for combustion . the thermal controller includes a memory element at least partially received in the combustion chamber and a rod connected between the memory element and the valve for controlling a rate at which fuel can flow through the passage defined in the valve based on the temperature in the combustion chamber . the memory element is a helical memory metal element . the memory element shrinks or expands when the temperature increases above a certain value .