Abstract: A steam generator is provided in operative association with a source of water and the exhaust system of a combustion engine including an air induction system provided with primary fuel inlet structure and supplemental fuel inlet structure. The steam generator derives its heat for converting water into steam from the exhaust system of the combustion engine and the steam generator includes a steam outlet communicated with and opening into one end of an elongated tubular housing disposed in good heat transfer relation with the exhaust system of the combustion engine and having a gas outlet at its other end communicated with the supplemental fuel inlet of the induction system.

Abstract: A gas generator is provided in the form of a closed housing having a predetermined amount of iron filings disposed therein and including a fluid inlet and a fluid outlet. A steam generator is also provided for heating water into steam and the steam generator includes an outlet communicated with the inlet of the gas generator housing. The steam and gas generators are operatively associated with a furnace with the steam generator being operatively associated with the combustion gas outlet of the furnace and the gas generator housing disposed within the combustion chamber of the furnace. The gas generator housing is shielded against direct exposure to the air and fuel mixture burning in the furnace and the furnace includes not only air and primary fuel inlets for the admission of air and fuel into the combustion chamber and mixing in the latter, but the combustion chamber additionally includes a supplemental fuel inlet to which the outlet of the gas generator housing is communicated.