A simple method for the production of superheated steam using a porous ceramic block is proposed. As soon as a fine wire heater, which is set up to contact spirally with the hole surface of a porous ceramic impregnated with water, is powered, superheated steam flows out of the hole within several seconds. Efficiency of energy utilization is higher than 90% at steady state. The micro-channel heat transfer inside the dried region of the porous ceramic that forms in the proximity of the heating wire, is shown to be significant for superheating of generated steam from the temperature measurement of vapor flowing out of the micro-pores. The depth of the dried region is estimated to be at least within 1 mm from the temperature distribution in the block that was measured using micro-thermocouples.