Ray, Charles D.; Ma, Li; Wilson, Thomas; Wilson, Daniel; … - In: Renewable Energy 62 (2014) C, pp. 439-453
The U.S. is the world's leading consumer of primary energy. A large fraction of this energy is used in boiler installations to generate steam and hot water for heating applications. It is estimated there are total 163,000 industrial and commercial boilers in use in the United States of all sizes.