The book discusses the issues of improving the use of fuel in boiler plants of low performance, gives practical recommendations for increasing the use of fuel in boiler plants. p. d. boilers, the optimal mode of operation of equipment, the use of secondary energy resources, reconstructive measures and automation for fuel economy, to reduce condensate losses, rational design and operation of fuel warehouses, etc. Attention is paid to the issues of justification of fuel economy measures, the methodology and examples of relevant technical and economic calculations are given. The book is intended for engineers, technicians and craftsmen engaged in the operation of boiler plants, and can serve as a practical guide for the development and implementation of fuel-saving measures.