Abstract This paper calls attention to the wastes of fuel in the industries using gas producers and producer-gas furnaces. Both of these problems are in the field of combustion engineering. The progress made in the last twenty-five years in gas-producer construction is emphasized by the descriptions of leading mechanical producers now in the market, together with an indication of their fuel-saving possibilities. Attention is called to the savings made possible by using suitable accessories in the gas house. To illustrate the possible savings in furnace operation a description is given of a distinctive type of recuperative furnace. The extension of the use of such a furnace to pulverized coal and oil would, the author states, result in similar savings.