In a method of manufacturing a copper-zinc-aluminum-based methanol reforming catalyst by coprecipitation, the methanol reforming catalyst is obtained by using a copper compound, a zinc compound and aluminum hydroxide, mixing them with an alkaline substance to produce a precipitate, calcining the precipitate obtained, and reducing the calcined product. The pulse frequency adjustment circuit outputs the alternative command pulse to the motor driving circuit instead of the command pulse received from the external controller, when the first frequency exceeds a predetermined level. In certain example embodiments, at least one vacuum insulated glass unit is provided as part of the water heater structure in order to help preserve heat that has been absorbed andor generated. It collates results received and send it to user who madesent the questionnaire. A plurality of thermoacoustic units are cascaded together within the region of high specific acoustic impedance, where at least one of the thermoacoustic units is a regenerator unit.