This Book is written for Boiler design engineers and Project managers. This book gives a basic understanding of fuel combustion, and thermal designs of Furnace, Super heater, Convection bank, Economizer and Air preheater. Selection of Boiler water feed Pums and ID, FD and SA Fans based on the pressured drops and draft loses encountered by the respective fluids is given. This Book gives the designs of Fire Tube, Fluid Bed Single Drum Boilers in basic way. This book covers the Power plant heat Balance diagrams and related calculations. Finally worked out designs of Double drum, Single drum, Fire tube and Fluidized bed boilers given elaborately. Lastly Cooling tower and Chimney designs are given