In 1985 Malaysia has changed from agricultural into industrial based economy. The industrial sector represents the highest consuming sector across all other sectors and accounts for about 48% of total energy demand. This study is concerned with an energy saving, economic and environmental analysis of industrial boilers in Malaysia. There are three principles that have been investigated: Installation of variable speed drive; fuels switching between diesel and other types of fuels such as natural gas and biomass; and installation of heat recovery systems in these boilers. After implementation...