In Sri Lanka, a variety of industries used steam for their manufacturing process. Those industries are food and beverage industries, paper manufacturing industries, textile industries, and cement manufacturing industries. Approximately 400 biomass boilers are operating in Sri Lanka. In biomass boilers, rubberwood, paddy husk, coconut husk, sawdust, and dendro are used as fuel. Fossil fuel also used in some industries for steam boilers and diesel boilers . Because each and every industry used boilers, there is an influence in the energy-saving measure in boiler efficiency. Therefore it is essential to identify places in which energy wastage occurs. Energy can be wasted in heat loss, including blow-down, radiation losses, and flue gas, as in Fig.1 .