We have developed a pipe-type thermoelectric module for use in heat exchangers that can simultaneously generate steam superheated above 100°C and electricity from the combustion heaters and cooking stoves. Thermoelectric ceramics, which are stable even in extremely hot air, are used to cover stainless steel tubes in electricity generating modules. This cover prevents the contact between flame and the stainless steel tube that acts as a heat exchanger, protecting the metal tube and extending the useful life of the heat exchanger. Control of the flame temperature will suppress the formation of nitrogen oxides (NO_X) or carbon monoxide (CO), which are products of incomplete combustion.