during normal i e post start up operating conditions the heater 52 is not used as the vaporizer 41 alone vaporizes the meoh and preheats the meoh air mix under certain conditions as described hereafter the combustor 34 could operate solely on the anode and cathode effluents without the need for additional meoh fuel from the vaporizer 41 under such conditions meoh injection to the combustor 34 is discontinued under other conditions e g increasing power demands supplemental fuel is provided to the combustor 34 as described above the combustor 34 receives multiple fuels such as a methanol air mix as well as anode effluent 26 from the anode of the fuel cell 22 oxygen depleted exhaust air 28 from the cathode of the fuel cell 22 and air from the compressor 30 are also supplied to the combustor 34 according to the present invention a controller 150 shown in fig1 controls the operation of the combustor 34 anode exhaust or effluent plus a liquid fuel i e methanol if required support the energy requirements of the combustor 34 an enthalpy balance maintains the desired reaction by temperature controlling the amount of air and or cathode exhaust supplied to the combustor 34 to meet all fuel processor heat requirements it should be noted that the energy requirements of the apparatus components are expressed herein in terms of power this is for convenience and is meant to express an energy.